LO3 rebuild (HP estimates?)
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Joined: Apr 2010
Posts: 1,029
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From: Modesto, California
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: LO3 rebuild (HP estimates?)
If you are really serious about getting some extra power out of your setup.
http://www.summitracing.com/parts/ho...t/model/camaro
Backed up to a single 2.5 to 3.5" merge Y from vibrant performance into a mandrel bent 3.5" pipe and a single in/single out 3.5" muffler with a single 3.5" pipe out the back. Will give the best HP/TQ gains possible. The crossflow mufflers do not flow worth having to be honest and I feel a single 3" is bit too small.
Single 3.5" is just barely smaller than dual 2.5" in flow area but higher in CFM.
I know some people will ask, why not single 3"......Single 3" is actually nearly a full inch smaller in flow area than dual 2.25" pipes. Dual 2.25" pipes are only good for a little over 350 HP without restriciting the engine. The factory ran 2.25" to single 3" exhaust setups on the truck and van 4.3/305/350s.
I would also hunt down a factory L69 or L82 air cleaner setup and run a hypertech powerbowl on the base with the air cleaner opening setup to match. This deshrouds the injectors and allows you to plumb cool air into the engine.
I know some people will ask why this setup...Seems overkill....blah blah blah.....I have two reason.....Nitrous or a bigger engine when you get tired of the 305 will both increase the exhaust flow tremendously. Might as well set up for going even faster while you are in there.
http://www.summitracing.com/parts/ho...t/model/camaro
Backed up to a single 2.5 to 3.5" merge Y from vibrant performance into a mandrel bent 3.5" pipe and a single in/single out 3.5" muffler with a single 3.5" pipe out the back. Will give the best HP/TQ gains possible. The crossflow mufflers do not flow worth having to be honest and I feel a single 3" is bit too small.
Single 3.5" is just barely smaller than dual 2.5" in flow area but higher in CFM.
I know some people will ask, why not single 3"......Single 3" is actually nearly a full inch smaller in flow area than dual 2.25" pipes. Dual 2.25" pipes are only good for a little over 350 HP without restriciting the engine. The factory ran 2.25" to single 3" exhaust setups on the truck and van 4.3/305/350s.
I would also hunt down a factory L69 or L82 air cleaner setup and run a hypertech powerbowl on the base with the air cleaner opening setup to match. This deshrouds the injectors and allows you to plumb cool air into the engine.
I know some people will ask why this setup...Seems overkill....blah blah blah.....I have two reason.....Nitrous or a bigger engine when you get tired of the 305 will both increase the exhaust flow tremendously. Might as well set up for going even faster while you are in there.
Joined: Jan 2005
Posts: 10,451
Likes: 510
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: LO3 rebuild (HP estimates?)
S h i t , i just got my flowmaster 17233 cat back (3in) Yes with crossflow muffler. so if your guessing dual 2.25" pipes are only good for a little over 350HP and said single 3" is a little less flow than that, is single 3" good for 350hp? thats what im shooting for after all is over with this lo5 ( need more fuel & tune obviously, Also probably going to do a 46.5mm TB from rvmorse with my edelbrock performer tbi intake bored to match)
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Joined: Apr 2010
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From: Modesto, California
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: LO3 rebuild (HP estimates?)
For a zero loss exhaust system you need 2.2 cfm per horsepower you make. A single straight piece of 2.25" pipe is 365 cfm. Even a mandrel bent 90* angle or two will reduce the flow drastically through the pipe. If its compression bent its even worse. The traditional compression bent 2.25" tailpipe only flows about 268 cfm! The typical crush bent muffler shop 2.25" dual exhaust system is only good for about 250 hp at the flywheel....Basically good for a stock engine and not much more. Lets say your traditional 2.25" exhaust had no bends and mufflers that were capable of flowing 365+ cfm as well. 365 cfm x 2 pipes = 770 cfm / 2.2 cfm per hp = 331.81 hp.......I said a little over 350 because it will flow a little higher as the backpressure increase and anything up to about 2 psi backpressure will not really effect HP that much. Dual 2.25" is good for about 350 HP at the flywheel. A 2.5" pipe flows 521 cfm. 521 cfm x 2 pipes = 1042 cfm / 2.2 cfm per hp = 473.63 hp. Its good to about 500 HP! The flow test values above are at 15 in/h20 which is about 1/2 psi.
Joined: Jan 2005
Posts: 10,451
Likes: 510
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: LO3 rebuild (HP estimates?)
I have seen a LS1 car make 400 to the tires with a single 3" exhaust but picked up nearly 30 rwhp with single 3.5 Y and cutout. You can make 350 hp with a single 3" pipe but top-end hp will start being held back from the engines potential as rpm and airflow increase and backpressure builds.
Joined: Sep 2006
Posts: 952
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From: Austria
Car: 84 TA / 89 Formula
Engine: LS1 / L03
Transmission: T56 / 700R4
Axle/Gears: 3.73 / 3.27
Re: LO3 rebuild (HP estimates?)
very informative and educated post there (once again) Fast, thanks.
damnit, now i need to go back and reconsider my exhaust setups LOL
question tho: since cfm is a volumetric unit, at what temperature are those 2.2 cfm / hp? say a cat and a muffler both rated at X cfm.. i would guess the muffler would be not as critical of an influence, since a lot of temperature is lost from the exhaust port back to the muffler.
FWIW i found some cat cfm ratings recently: http://ls1tech.com/forums/generation-iii-external-engine/872389-cats-best.html
i personally am a fan of the Magnaflow spun metallic cats, e.g. 59959 (98$) or 59969 (108$).. flowing in the high 500 cfm range, latter one closer to 600 (http://ls1tech.com/forums/generation...duct-line.html) can't beat bang for the buck on those imho.
damnit, now i need to go back and reconsider my exhaust setups LOL
question tho: since cfm is a volumetric unit, at what temperature are those 2.2 cfm / hp? say a cat and a muffler both rated at X cfm.. i would guess the muffler would be not as critical of an influence, since a lot of temperature is lost from the exhaust port back to the muffler.
FWIW i found some cat cfm ratings recently: http://ls1tech.com/forums/generation-iii-external-engine/872389-cats-best.html
i personally am a fan of the Magnaflow spun metallic cats, e.g. 59959 (98$) or 59969 (108$).. flowing in the high 500 cfm range, latter one closer to 600 (http://ls1tech.com/forums/generation...duct-line.html) can't beat bang for the buck on those imho.
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
If you are really serious about getting some extra power out of your setup.
http://www.summitracing.com/parts/ho...t/model/camaro
Backed up to a single 2.5 to 3.5" merge Y from vibrant performance into a mandrel bent 3.5" pipe and a single in/single out 3.5" muffler with a single 3.5" pipe out the back. Will give the best HP/TQ gains possible. The crossflow mufflers do not flow worth having to be honest and I feel a single 3" is bit too small.
Single 3.5" is just barely smaller than dual 2.5" in flow area but higher in CFM.
I know some people will ask, why not single 3"......Single 3" is actually nearly a full inch smaller in flow area than dual 2.25" pipes. Dual 2.25" pipes are only good for a little over 350 HP without restriciting the engine. The factory ran 2.25" to single 3" exhaust setups on the truck and van 4.3/305/350s.
I would also hunt down a factory L69 or L82 air cleaner setup and run a hypertech powerbowl on the base with the air cleaner opening setup to match. This deshrouds the injectors and allows you to plumb cool air into the engine.
I know some people will ask why this setup...Seems overkill....blah blah blah.....I have two reason.....Nitrous or a bigger engine when you get tired of the 305 will both increase the exhaust flow tremendously. Might as well set up for going even faster while you are in there.
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Thread Starter
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Thread Starter
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Car: 1991 firebird
Engine: TBI 305 (built)
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Axle/Gears: 4.10
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
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Joined: Apr 2010
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From: Modesto, California
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: LO3 rebuild (HP estimates?)
Attachment 277859
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Attachment 277864
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Joined: Mar 2014
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From: South Ms
Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: LO3 rebuild (HP estimates?)
Car sounds great and you have made a solid performer out of it.Anxious 2 c what it turns in the 1/4. Great job!
Joined: Jan 2005
Posts: 10,451
Likes: 510
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: LO3 rebuild (HP estimates?)
Attachment 277864
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Running the preheater setup will also help your MPG in cool weather and help stabilize your BLM fuel trims year round. 5 KPA is 1.5 in/hg vacuum. Once you hit 90 KPA that is 3.00 in/hg or roughly 10% of the available air pressure at sea level. Last edited by Fast355; May 23, 2014 at 04:27 PM.
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Car: 1991 firebird
Engine: TBI 305 (built)
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Axle/Gears: 4.10
Its 3" thin wall aluminum pipeing from summit 35$ for 5' .. and all the rubber elbows and couplers are made by spectre from summit .. carb hat from summit too 100$ ... I'm thinking I'm gonna go back and use 2 45* instead of that 90 that's there .. and ilk have to check my datalogs but I believe I was around 96-97 map at 5500-6k
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Thread Starter
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
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Car: 1991 firebird
Engine: TBI 305 (built)
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May even add a single plane intake and a little more duration on the cam @ a 112 LSA along with the new exhaust but idk
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
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Re: LO3 rebuild (HP estimates?)
RBob.
Joined: Jan 2005
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: LO3 rebuild (HP estimates?)
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Car: 1991 firebird
Engine: TBI 305 (built)
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Axle/Gears: 4.10
What do y'all think about the edelbrock torquer 2 intake ? .. or should I just stay with my summit stage 2 dual plane that I spent 2 days modifying cleaning up the runners , dividers , and notched the center divider about a 1.5" down 2" long
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Joined: Jan 2005
Posts: 10,451
Likes: 510
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: LO3 rebuild (HP estimates?)
http://www.summitracing.com/parts/edl-2901/overview/
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Car: 1991 firebird
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Axle/Gears: 4.10
Well this is actually my daily driver for now .. my other car was totalled ... I'm just trying to figure out how to get as much as possible out of the current setup without digging too far back into the engine .. I also believe there is still some power left in the tune ... but I'm no tunning expert .. I'd prolly b better off doing my exhaust but I'm a little short on cash and can't afford 500+$ long tubes plus the other 3-400 for the rest .. I may just add a 100 shot for now lol ... any suggestions would b great ... I really wanna run a 8.0. On motor but don't wanna break anything either with my first baby on the way I'm trying to save some ,$ ... and thanks for everything Fast ... I respect ur advice greatly ... any help to get this thing a little snapier would b great
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Joined: Jan 2005
Posts: 10,451
Likes: 510
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: LO3 rebuild (HP estimates?)
Well this is actually my daily driver for now .. my other car was totalled ... I'm just trying to figure out how to get as much as possible out of the current setup without digging too far back into the engine .. I also believe there is still some power left in the tune ... but I'm no tunning expert .. I'd prolly b better off doing my exhaust but I'm a little short on cash and can't afford 500+$ long tubes plus the other 3-400 for the rest .. I may just add a 100 shot for now lol ... any suggestions would b great ... I really wanna run a 8.0. On motor but don't wanna break anything either with my first baby on the way I'm trying to save some ,$ ... and thanks for everything Fast ... I respect ur advice greatly ... any help to get this thing a little snapier would b great
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
http://www.ebay.com/itm/Weiand-Team-G-Intake-Manifold-Chevy-SBC-283-327-350-Fits-Stock-Heads-/121345502202?pt=Motors_Car_Truck_Parts_Accessories&hash=item1c40c16bfa
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From: Austria
Car: 84 TA / 89 Formula
Engine: LS1 / L03
Transmission: T56 / 700R4
Axle/Gears: 3.73 / 3.27
Re: LO3 rebuild (HP estimates?)
slightly off topic but interesting all the same: so you used the THERMAC to compensate for cold days only or..?
1991sleeper, since you already got all the equipment needed for tuning, all you need to take it further here is time, no additional moneys.. and i think if it is your daily you should try figure the tune out either way, not only for increased performance but also consistent fueling etc to get good durability out of your build.
also, from what i gather using NOS will make the tune even more critical.
if it's your only driver right now i'd stay away from nitrous, but i guess that depends on how adventurous you feel
edit: Fast, so that ebay link is the weiand 7525 you mentioned? i couldn't find that p/n on summit or the like..
1991sleeper, since you already got all the equipment needed for tuning, all you need to take it further here is time, no additional moneys.. and i think if it is your daily you should try figure the tune out either way, not only for increased performance but also consistent fueling etc to get good durability out of your build.
also, from what i gather using NOS will make the tune even more critical.
if it's your only driver right now i'd stay away from nitrous, but i guess that depends on how adventurous you feel
edit: Fast, so that ebay link is the weiand 7525 you mentioned? i couldn't find that p/n on summit or the like..
Joined: Jan 2005
Posts: 10,451
Likes: 510
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: LO3 rebuild (HP estimates?)
slightly off topic but interesting all the same: so you used the THERMAC to compensate for cold days only or..?
1991sleeper, since you already got all the equipment needed for tuning, all you need to take it further here is time, no additional moneys.. and i think if it is your daily you should try figure the tune out either way, not only for increased performance but also consistent fueling etc to get good durability out of your build.
also, from what i gather using NOS will make the tune even more critical.
if it's your only driver right now i'd stay away from nitrous, but i guess that depends on how adventurous you feel
edit: Fast, so that ebay link is the weiand 7525 you mentioned? i couldn't find that p/n on summit or the like..
1991sleeper, since you already got all the equipment needed for tuning, all you need to take it further here is time, no additional moneys.. and i think if it is your daily you should try figure the tune out either way, not only for increased performance but also consistent fueling etc to get good durability out of your build.
also, from what i gather using NOS will make the tune even more critical.
if it's your only driver right now i'd stay away from nitrous, but i guess that depends on how adventurous you feel
edit: Fast, so that ebay link is the weiand 7525 you mentioned? i couldn't find that p/n on summit or the like..
I ran the Thermac year round and the OEM target was like 120*F intake air temperature. By stabilizing the air temperature you end up stabilizing the tune.
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Car: 1991 firebird
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Yea my iat is usually around 3-5* above ambient temps ... and at the track I'm shifting at 5800-6k ... I think exhaust and some better tires would b my best investment as of right now heh ?
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
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Car: 1991 firebird
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And that listing on eBay already ended I've been asleep all day working night shift
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
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Car: 1991 firebird
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And if I do go the spray route .
I will b starting with a 50-75 shot and work my way up 125 ... also will use a wet kit with a 1-2 gal fuel cell in engine bay with 110 leaded for the wet side .. just to b on safe side of things ... then use the ebl for n2o control and regard timing 4* on the hit
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
I will b starting with a 50-75 shot and work my way up 125 ... also will use a wet kit with a 1-2 gal fuel cell in engine bay with 110 leaded for the wet side .. just to b on safe side of things ... then use the ebl for n2o control and regard timing 4* on the hit
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
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Fast355! What are or reccomendations to get as much as possible out of the setup without going too deep into the engine ! .... I'm seriously thinking about a custom cam specifically for this engine/setup but my vslvesprungs are only good to .560 lift and the heads really quit flowing around .550 anyway ... but withe the current cam and 1.6rr it comes out to .520/.528 anyway ... which I know the dual pattern can ain't the best choice for these heads but if I go the spray route or boost it should work nicely with the current cam ... I really need help with my SA tables as well .. that part of tunning is just a little over my head at this point
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
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Car: 1991 firebird
Engine: TBI 305 (built)
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Axle/Gears: 4.10
I know u have built the one of the fastest NA 305's on these boards ... along with a few others ... if anyone runs across some used hooker tuned length long tubes let me know as I'm sure my exhaust system should prolly b first on my list .... I have 2 2.5" pypes M80 round bullet mufflers in the garage ... I was thinking I could just run some long rubes into dual 2.5's with those mufflers into turndowns right before the axle n call it a day ...
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Joined: Jan 2005
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: LO3 rebuild (HP estimates?)
I know u have built the one of the fastest NA 305's on these boards ... along with a few others ... if anyone runs across some used hooker tuned length long tubes let me know as I'm sure my exhaust system should prolly b first on my list .... I have 2 2.5" pypes M80 round bullet mufflers in the garage ... I was thinking I could just run some long rubes into dual 2.5's with those mufflers into turndowns right before the axle n call it a day ...
You could run dual 2.5" or look at what Matt did with his exhaust for his 12 second 305 car. He had a single 3.5", dumped at the axle. IMO you need something to equalize the pressure between banks to help the exhaust system really scavenge the engine.
A little more duration and a little tighter LSA never could hurt. However you will lose idle quality as the overlap increase and that can make tuning a little fun. I am tuning a XE 268 roller cam in a 350 Vortec with the old 7747 at the moment, so it can be easily be done with the EBL, may just be time consuming.
Joined: Jan 2005
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: LO3 rebuild (HP estimates?)
Start a new thread in the DIY Prom board. Post your current .BIN file and a screen shot of the timing table. I am sure we can get you an abundance of ideas and help for the spark map. Many would gladly look over the tune.
I just did the same thing with the 7747 Tune I am working on, helping another guy to get his Vortec 350 swapped TBI truck running right.
I just did the same thing with the 7747 Tune I am working on, helping another guy to get his Vortec 350 swapped TBI truck running right.
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
OK cool ... I will start a thread shortly with my current bin and a few datalogs ... and if I do run duals I will use one of them narrow x pipes prolly
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Thread Starter
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
OK cool ... I will start a thread shortly with my current bin and a few datalogs ... and if I do run duals I will use one of them narrow x pipes to tie the banks together
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Joined: Jan 2005
Posts: 10,451
Likes: 510
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: LO3 rebuild (HP estimates?)
This one is made by Vibrant performance, relatively inexpensive and made of T304 stainless steel. She is a work of art as far as scavenging goes.
Thread Starter
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Diy thread posted with bin and 2 data logs
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Thread Starter
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
I think I'm about to order founders pan hard relocation kit so I have some room when I do the exhaust ... and right now I'm running the flow master 2.5-3" Y merge ... but it dont do much good with the crappy crush bent BS that's on there
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Thread Starter
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iTrader: (-3)
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
I swear they engineer the TPS sensors to go bad about every 2-3 years ... Grrr ... Tps #4
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Joined: Jan 2005
Posts: 10,451
Likes: 510
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: LO3 rebuild (HP estimates?)
Thread Starter
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iTrader: (-3)
Joined: Dec 2012
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
I've had the car 7 years and my dad had it for about 7 before me .. My dad put 1 on it but it sat in his shop for 98% of those 7 years .. And I know I've put at least 3 on if not 4 .... All from either O'Reilly or autozone
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Joined: Sep 2006
Posts: 952
Likes: 2
From: Austria
Car: 84 TA / 89 Formula
Engine: LS1 / L03
Transmission: T56 / 700R4
Axle/Gears: 3.73 / 3.27
Re: LO3 rebuild (HP estimates?)
I've owned and worked on these cars and some of friends for about 7 or 8 years now and I've never had to replace a TPS. Adjusting them, yes. But failing, nope.
Thread Starter
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Thread Starter
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
I guess I've been buying the cheap ones in the past cause I know I ain't never paid more than 40$ for one ... Paid 50$ for a lifetime warrantee tps today so I ain't gotta worry about paying for another one now
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Thread Starter
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Wellno track this week .. Stupid rain !.... I wanna hit 8.50's on my next outing on street tires ... I got a little more meat under it now both taller and wider .. So 60' and mph should pick up slightly
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Thread Starter
Supreme Member
iTrader: (-3)
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
!
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Thread Starter
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
FML ... Being laid off sucks !
And Alabama unemployment sucks worse
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
And Alabama unemployment sucks worse
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Thread Starter
Supreme Member
iTrader: (-3)
Joined: Dec 2012
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Bump for videos
http://m.youtube.com/channel/UC5O2dInGbDVaMY89XqD_iBg
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
http://m.youtube.com/channel/UC5O2dInGbDVaMY89XqD_iBg
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Joined: Sep 2006
Posts: 952
Likes: 2
From: Austria
Car: 84 TA / 89 Formula
Engine: LS1 / L03
Transmission: T56 / 700R4
Axle/Gears: 3.73 / 3.27
Re: LO3 rebuild (HP estimates?)
well that a damn, sorry to hear. on the bright side, one could say you got a lot of time for tuning now, but i'm sure you got other troubles to worry about now..
Thread Starter
Supreme Member
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Just to put this little 305cu.in. motor into perspective .. Mostly stock LS (free mods) cars run about the same times I'm running right now at 2-3mph less than I'm trapping ... With way more advanced technology and prolly a better exhaust than what I have now
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
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Joined: Apr 2010
Posts: 1,029
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From: Modesto, California
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: LO3 rebuild (HP estimates?)
Just to put this little 305cu.in. motor into perspective .. Mostly stock LS (free mods) cars run about the same times I'm running right now at 2-3mph less than I'm trapping ... With way more advanced technology and prolly a better exhaust than what I have now
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon
Thread Starter
Supreme Member
iTrader: (-3)
Joined: Dec 2012
Posts: 1,184
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Only have 1/8 mile tracks here ... Best so far is in my SIG 8.63 @ 85 mph I believe .. That was on some shitty street tires with awful 2.1 60' and the mentioned horrid exhaust system
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.63@ 85mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.63@ 85mph 1/8th on street tires... 8.000's soon
Supreme Member
Joined: Apr 2010
Posts: 1,029
Likes: 11
From: Modesto, California
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: LO3 rebuild (HP estimates?)
Only have 1/8 mile tracks here ... Best so far is in my SIG 8.63 @ 85 mph I believe .. That was on some shitty street tires with awful 2.1 60' and the mentioned horrid exhaust system
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.63@ 85mph 1/8th on street tires... 8.000's soon
91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.63@ 85mph 1/8th on street tires... 8.000's soon
Tell me please, and be honest, do you really get 24mpg on the freeway with those 4.10's!??! Im in need of a rear swap and want to go 3.73's or 3.42's but am contemplating on freeway speeds because this is my DD once again.