Built 350 estimates?
#1
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Car: 1991 Camaro RS
Engine: Built TBI 350
Transmission: T-5
Axle/Gears: 3.42 Posi
Built 350 estimates?
I just got done building my motor. I'm curious to see what kind of power it has. Any estimates? It's a LO5 block with:
Ported Vortec Heads
Air Gap Intake
1.5 Crane Roller Rockers
Lt4 Hotcam
Roller Lifters
Shorty Headers
454 Throttle Body
The lower end of the motor is all stock...
Ported Vortec Heads
Air Gap Intake
1.5 Crane Roller Rockers
Lt4 Hotcam
Roller Lifters
Shorty Headers
454 Throttle Body
The lower end of the motor is all stock...
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Car: 1988 Camaro
Engine: 377
Transmission: TH350; Circle D 4200 converter
Axle/Gears: Ford 9"
Re: Built 350 estimates?
Depends who ported the heads. That could have just nuked things if it wasn't someone who really knows the casting well.. otherwise, I agree.
#4
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Car: 1991 Camaro RS
Engine: Built TBI 350
Transmission: T-5
Axle/Gears: 3.42 Posi
#6
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Car: 1991 Camaro RS
Engine: Built TBI 350
Transmission: T-5
Axle/Gears: 3.42 Posi
Re: Built 350 estimates?
Yes, me and my dad did them. The intake ports were just shaved a hair. And he's built COUNTLESS motors. He's guessing around 400hp at the crank and I'm guessing 380.
#7
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Re: Built 350 estimates?
The Vortec intake ports have a lot of really advanced fluid dynamics engineering put into them. If you left the port shape alone you should be okay as long as you didnt mess with it too much. 400hp is a bit high... if the porting helped a lot you could probably hit 400hp with an xr276 or 282 but your bottom end cant handle the RPM's needed for that reliably. The LT4 hotcam is on the edge of your safe RPM envelope with stock rod bolts I'd say. So if the porting was just right, then you may be up in the 350-370hp range, especially if you addressed the exhaust ports. I think the TBI will become a limit before you can hit those numbers though. You're probably going to see it peak around 350hp if you can absolutely maximize the TBI's fuel and air flow. I think they're reputed to peak at that point if everything is set up perfectly.
This is still just speculation by an idiot on the internets... grain of salt. But these are just the numbers I see around here that make sense. Like I said, this should be a relaly quick setup. High 12's... probably trapping around 105-110 depending on the weight of the car.
This is still just speculation by an idiot on the internets... grain of salt. But these are just the numbers I see around here that make sense. Like I said, this should be a relaly quick setup. High 12's... probably trapping around 105-110 depending on the weight of the car.
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#8
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Car: 1991 Camaro RS
Engine: Built TBI 350
Transmission: T-5
Axle/Gears: 3.42 Posi
Re: Built 350 estimates?
The Vortec intake ports have a lot of really advanced fluid dynamics engineering put into them. If you left the port shape alone you should be okay as long as you didnt mess with it too much. 400hp is a bit high... if the porting helped a lot you could probably hit 400hp with an xr276 or 282 but your bottom end cant handle the RPM's needed for that reliably. The LT4 hotcam is on the edge of your safe RPM envelope with stock rod bolts I'd say. So if the porting was just right, then you may be up in the 350-370hp range, especially if you addressed the exhaust ports. I think the TBI will become a limit before you can hit those numbers though. You're probably going to see it peak around 350hp if you can absolutely maximize the TBI's fuel and air flow. I think they're reputed to peak at that point if everything is set up perfectly.
This is still just speculation by an idiot on the internets... grain of salt. But these are just the numbers I see around here that make sense. Like I said, this should be a relaly quick setup. High 12's... probably trapping around 105-110 depending on the weight of the car.
This is still just speculation by an idiot on the internets... grain of salt. But these are just the numbers I see around here that make sense. Like I said, this should be a relaly quick setup. High 12's... probably trapping around 105-110 depending on the weight of the car.
#9
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Re: Built 350 estimates?
With a 5 speed you'll want at least 3.42s... I'd go for 3.73's honestly. A 5 speed will like that. If it's a T5 you'll be making enough power to break it, that's for sure. The only way to get high 12's with a manual is going to be to dump the clutch on some slicks, and the T5 isnt gonna like that at all. So i'd avoid it. It should trap real healthy and pull hard though.
#10
Supreme Member
Re: Built 350 estimates?
With a 5 speed you'll want at least 3.42s... I'd go for 3.73's honestly. A 5 speed will like that. If it's a T5 you'll be making enough power to break it, that's for sure. The only way to get high 12's with a manual is going to be to dump the clutch on some slicks, and the T5 isnt gonna like that at all. So i'd avoid it. It should trap real healthy and pull hard though.
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Car: 1991 Camaro RS
Engine: Built TBI 350
Transmission: T-5
Axle/Gears: 3.42 Posi
Re: Built 350 estimates?
I forgot to metion this is my daily driver/ weekend warrior. With 3.23 it would make a great median. And I would like to run 3.73s, but it would mess up my speedometer a little too much. I want this car to be faster than a LS1 camaro. And I think they run mid 13's.
#12
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Re: Built 350 estimates?
I forgot to metion this is my daily driver/ weekend warrior. With 3.23 it would make a great median. And I would like to run 3.73s, but it would mess up my speedometer a little too much. I want this car to be faster than a LS1 camaro. And I think they run mid 13's.
If you want to go fast, go 3.73's. If you want gas mileage/daily driver, leave the 3.08's in there. you're going to hate getting that thing moved from a stop until you put 3.42's in it, but at least you'll get decent gas mileage. Remember, 3.42's were the factory LB9/T5 gearing with the G92 package, and 3.42's are factory gearing for T56 cars as well. You're not even going to notice a difference going from 3.08's to 3.23's.
The only problem Im having now is T5's came in a gazillion ratios, so unless you know what model T5 yours is ( https://www.thirdgen.org/forums/post...007-post6.html ) there's no way to really know if the LT4 hotcam is going to even able to easily pull 3.23's out of the hole. Remember that large cams shift the power band up higher than stock. That means you dont have as much low end torque (this is why people like more displacement, because you can get that back) to pull the car from a stop. Yours is a more medium-sized cam, but understand that big cams need short (numerically high) gearing to get the car into the powerband to run properly.
Last edited by InfernalVortex; 07-04-2014 at 03:43 AM.
#13
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Re: Built 350 estimates?
If your T5 is stock to your car, it's a T5U.
T5U
2.95
1.94
1.34
1.1
.63
This setup in first gear with a 3.42 gear is almost exactly the same as my T56 first gear with 3.70's. That's about what you want. It's spot on actually. I've got a cam with very similar duration numbers so it will have a very similar power curve.
Your setup wtih 3.08's is actually pretty close to mine when I had the 3.27's.... so you're going to see first hand how much fun it is to lug that thing out of the hole from a stop sign until you change the gears in the axle. I think you'll be happy to get 3.42's in there after dealing with that for a little while.
Also, you should have a .63 5th gear, which is the better "gas mileage" gear.
That puts you at 71mph at 2000 RPM with 3.42's. That's as perfect as you're going to get.
Put 3.42's in it if you want to cruise. Put 3.73's in it if you want to race it.
For further reference, with 3.73's, you're gonig to be at 65mph at 2000 RPM.
For midias, with his 3.73's, he will be at 2500 RPMs at 70 mph. That is a little tiresome for sure. 2500 is around where it starts just getting annoying, but that's my opinion.
T5U
2.95
1.94
1.34
1.1
.63
This setup in first gear with a 3.42 gear is almost exactly the same as my T56 first gear with 3.70's. That's about what you want. It's spot on actually. I've got a cam with very similar duration numbers so it will have a very similar power curve.
Your setup wtih 3.08's is actually pretty close to mine when I had the 3.27's.... so you're going to see first hand how much fun it is to lug that thing out of the hole from a stop sign until you change the gears in the axle. I think you'll be happy to get 3.42's in there after dealing with that for a little while.
Also, you should have a .63 5th gear, which is the better "gas mileage" gear.
That puts you at 71mph at 2000 RPM with 3.42's. That's as perfect as you're going to get.
Put 3.42's in it if you want to cruise. Put 3.73's in it if you want to race it.
For further reference, with 3.73's, you're gonig to be at 65mph at 2000 RPM.
For midias, with his 3.73's, he will be at 2500 RPMs at 70 mph. That is a little tiresome for sure. 2500 is around where it starts just getting annoying, but that's my opinion.
Last edited by InfernalVortex; 07-04-2014 at 03:58 AM.
#14
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Car: 1991 Camaro RS
Engine: Built TBI 350
Transmission: T-5
Axle/Gears: 3.42 Posi
Re: Built 350 estimates?
If your T5 is stock to your car, it's a T5U.
T5U
2.95
1.94
1.34
1.1
.63
This setup in first gear with a 3.42 gear is almost exactly the same as my T56 first gear with 3.70's. That's about what you want. It's spot on actually. I've got a cam with very similar duration numbers so it will have a very similar power curve.
Your setup wtih 3.08's is actually pretty close to mine when I had the 3.27's.... so you're going to see first hand how much fun it is to lug that thing out of the hole from a stop sign until you change the gears in the axle. I think you'll be happy to get 3.42's in there after dealing with that for a little while.
Also, you should have a .63 5th gear, which is the better "gas mileage" gear.
That puts you at 71mph at 2000 RPM with 3.42's. That's as perfect as you're going to get.
Put 3.42's in it if you want to cruise. Put 3.73's in it if you want to race it.
For further reference, with 3.73's, you're gonig to be at 65mph at 2000 RPM.
For midias, with his 3.73's, he will be at 2500 RPMs at 70 mph. That is a little tiresome for sure. 2500 is around where it starts just getting annoying, but that's my opinion.
T5U
2.95
1.94
1.34
1.1
.63
This setup in first gear with a 3.42 gear is almost exactly the same as my T56 first gear with 3.70's. That's about what you want. It's spot on actually. I've got a cam with very similar duration numbers so it will have a very similar power curve.
Your setup wtih 3.08's is actually pretty close to mine when I had the 3.27's.... so you're going to see first hand how much fun it is to lug that thing out of the hole from a stop sign until you change the gears in the axle. I think you'll be happy to get 3.42's in there after dealing with that for a little while.
Also, you should have a .63 5th gear, which is the better "gas mileage" gear.
That puts you at 71mph at 2000 RPM with 3.42's. That's as perfect as you're going to get.
Put 3.42's in it if you want to cruise. Put 3.73's in it if you want to race it.
For further reference, with 3.73's, you're gonig to be at 65mph at 2000 RPM.
For midias, with his 3.73's, he will be at 2500 RPMs at 70 mph. That is a little tiresome for sure. 2500 is around where it starts just getting annoying, but that's my opinion.
#16
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Car: 1991 Camaro RS
Engine: Built TBI 350
Transmission: T-5
Axle/Gears: 3.42 Posi
#18
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Re: Built 350 estimates?
1352-196 that came in GM 1989 F-Car LO3 TBI 5.0L V8 WC
2.95 1.94 1.34 1.00 0.63
When I run it through some calculators I get this. 2500 is about 80mph which I remember being fairly accurate when I drive the car I remember the .73 being short but it pulled hard in 5th.
Code:
1st 2nt 3rd 4th 5th 5th 2.95 1.94 1.34 1 0.63 0.73 500 3 5 7 10 16 14 750 5 8 11 15 24 21 1000 7 10 15 20 32 27 1250 9 13 19 25 40 34 1500 10 16 22 30 48 41 1750 12 18 26 35 56 48 2000 14 21 30 40 64 55 2250 15 23 34 45 72 62 2500 17 26 37 50 80 69 2750 19 28 41 55 88 76 3000 20 31 45 60 96 82 3250 22 34 49 65 104 89 3500 24 36 52 70 111 96 3750 26 39 56 75 119 103 4000 27 41 60 80 127 110 4250 29 44 64 85 135 117 4500 31 47 67 90 143 124 4750 32 49 71 95 151 131 5000 34 52 75 100 159 137 5250 36 54 79 105 167 144 5500 37 57 82 110 175 151 5750 39 59 86 115 183 158 6000 41 62 90 120 191 165 6250 43 65 94 125 199 172 6500 44 67 97 130 207 179
#19
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Car: 1991 Camaro RS
Engine: Built TBI 350
Transmission: T-5
Axle/Gears: 3.42 Posi
#20
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Re: Built 350 estimates?
I have the
1352-196 that came in GM 1989 F-Car LO3 TBI 5.0L V8 WC
2.95 1.94 1.34 1.00 0.63
When I run it through some calculators I get this. 2500 is about 80mph which I remember being fairly accurate when I drive the car I remember the .73 being short but it pulled hard in 5th.
1352-196 that came in GM 1989 F-Car LO3 TBI 5.0L V8 WC
2.95 1.94 1.34 1.00 0.63
When I run it through some calculators I get this. 2500 is about 80mph which I remember being fairly accurate when I drive the car I remember the .73 being short but it pulled hard in 5th.
Code:
1st 2nt 3rd 4th 5th 5th 2.95 1.94 1.34 1 0.63 0.73 500 3 5 7 10 16 14 750 5 8 11 15 24 21 1000 7 10 15 20 32 27 1250 9 13 19 25 40 34 1500 10 16 22 30 48 41 1750 12 18 26 35 56 48 2000 14 21 30 40 64 55 2250 15 23 34 45 72 62 2500 17 26 37 50 80 69 2750 19 28 41 55 88 76 3000 20 31 45 60 96 82 3250 22 34 49 65 104 89 3500 24 36 52 70 111 96 3750 26 39 56 75 119 103 4000 27 41 60 80 127 110 4250 29 44 64 85 135 117 4500 31 47 67 90 143 124 4750 32 49 71 95 151 131 5000 34 52 75 100 159 137 5250 36 54 79 105 167 144 5500 37 57 82 110 175 151 5750 39 59 86 115 183 158 6000 41 62 90 120 191 165 6250 43 65 94 125 199 172 6500 44 67 97 130 207 179
I sitll wouldn't suggest "pulling" in 5th, though... the overdrive gears are just not designed for high loads.
#21
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Car: 1991 Camaro RS
Engine: Built TBI 350
Transmission: T-5
Axle/Gears: 3.42 Posi
Re: Built 350 estimates?
I'm kind of curious what I will get for mileage. Think I can get 14 with a 3.42 rear end? Remember, I'm a teen who beats on the car one in a while.
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Car: 67 ******mobile
Engine: 385 Solid roller
Transmission: T-56
Axle/Gears: 4.11
Re: Built 350 estimates?
x2. Want the fastest car forget about mileage til you can get a turbo on it
Should be a 13 sec car if all goes well. Youll have to learn how to launch it what you do on the street is a different story than the track.
Just start out leaving as if you were trying to get across an intersection quick, go from there, learn how to slip the clutch withouth spinning etc
Dont worry about powershifting its not worth much time wise and risk of breakage.
INfernal is right on the heads they are tricky to pull #s out of and NOT kill off the low/mids that make those heads what they are. Most DIY go right for butchering the pinch area big mistake. Leave the chamber alone, also.
Main thing is go out there and have fun. Youll need a number of passes before you get a decent time anyway youll see. From there you can start learning to tune the chassis theres gains there also weight reduction etc.
Its a friggin disease. Im 46 and hasnt let up a bit.
Should be a 13 sec car if all goes well. Youll have to learn how to launch it what you do on the street is a different story than the track.
Just start out leaving as if you were trying to get across an intersection quick, go from there, learn how to slip the clutch withouth spinning etc
Dont worry about powershifting its not worth much time wise and risk of breakage.
INfernal is right on the heads they are tricky to pull #s out of and NOT kill off the low/mids that make those heads what they are. Most DIY go right for butchering the pinch area big mistake. Leave the chamber alone, also.
Main thing is go out there and have fun. Youll need a number of passes before you get a decent time anyway youll see. From there you can start learning to tune the chassis theres gains there also weight reduction etc.
Its a friggin disease. Im 46 and hasnt let up a bit.
#24
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Car: 1991 Camaro RS
Engine: Built TBI 350
Transmission: T-5
Axle/Gears: 3.42 Posi
Re: Built 350 estimates?
x2. Want the fastest car forget about mileage til you can get a turbo on it
Should be a 13 sec car if all goes well. Youll have to learn how to launch it what you do on the street is a different story than the track.
Just start out leaving as if you were trying to get across an intersection quick, go from there, learn how to slip the clutch withouth spinning etc
Dont worry about powershifting its not worth much time wise and risk of breakage.
INfernal is right on the heads they are tricky to pull #s out of and NOT kill off the low/mids that make those heads what they are. Most DIY go right for butchering the pinch area big mistake. Leave the chamber alone, also.
Main thing is go out there and have fun. Youll need a number of passes before you get a decent time anyway youll see. From there you can start learning to tune the chassis theres gains there also weight reduction etc.
Its a friggin disease. Im 46 and hasnt let up a bit.
Should be a 13 sec car if all goes well. Youll have to learn how to launch it what you do on the street is a different story than the track.
Just start out leaving as if you were trying to get across an intersection quick, go from there, learn how to slip the clutch withouth spinning etc
Dont worry about powershifting its not worth much time wise and risk of breakage.
INfernal is right on the heads they are tricky to pull #s out of and NOT kill off the low/mids that make those heads what they are. Most DIY go right for butchering the pinch area big mistake. Leave the chamber alone, also.
Main thing is go out there and have fun. Youll need a number of passes before you get a decent time anyway youll see. From there you can start learning to tune the chassis theres gains there also weight reduction etc.
Its a friggin disease. Im 46 and hasnt let up a bit.
#25
Re: Built 350 estimates?
If your T5 is stock to your car, it's a T5U.
T5U
2.95
1.94
1.34
1.1
.63
This setup in first gear with a 3.42 gear is almost exactly the same as my T56 first gear with 3.70's. That's about what you want. It's spot on actually. I've got a cam with very similar duration numbers so it will have a very similar power curve.
Your setup wtih 3.08's is actually pretty close to mine when I had the 3.27's.... so you're going to see first hand how much fun it is to lug that thing out of the hole from a stop sign until you change the gears in the axle. I think you'll be happy to get 3.42's in there after dealing with that for a little while.
Also, you should have a .63 5th gear, which is the better "gas mileage" gear.
That puts you at 71mph at 2000 RPM with 3.42's. That's as perfect as you're going to get.
Put 3.42's in it if you want to cruise. Put 3.73's in it if you want to race it.
For further reference, with 3.73's, you're gonig to be at 65mph at 2000 RPM.
For midias, with his 3.73's, he will be at 2500 RPMs at 70 mph. That is a little tiresome for sure. 2500 is around where it starts just getting annoying, but that's my opinion.
T5U
2.95
1.94
1.34
1.1
.63
This setup in first gear with a 3.42 gear is almost exactly the same as my T56 first gear with 3.70's. That's about what you want. It's spot on actually. I've got a cam with very similar duration numbers so it will have a very similar power curve.
Your setup wtih 3.08's is actually pretty close to mine when I had the 3.27's.... so you're going to see first hand how much fun it is to lug that thing out of the hole from a stop sign until you change the gears in the axle. I think you'll be happy to get 3.42's in there after dealing with that for a little while.
Also, you should have a .63 5th gear, which is the better "gas mileage" gear.
That puts you at 71mph at 2000 RPM with 3.42's. That's as perfect as you're going to get.
Put 3.42's in it if you want to cruise. Put 3.73's in it if you want to race it.
For further reference, with 3.73's, you're gonig to be at 65mph at 2000 RPM.
For midias, with his 3.73's, he will be at 2500 RPMs at 70 mph. That is a little tiresome for sure. 2500 is around where it starts just getting annoying, but that's my opinion.
Tire size???.
#26
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Car: 86 IROC
Engine: 5.0 TPI
Transmission: 700-R-4
Axle/Gears: 2.73 open
Re: Built 350 estimates?
as mentioned earlier .you cant have it both ways.build it for the track,OR street.you CAN drive a track built car on the street.but it will eat your lunch ,and quick. and you CAN drive a street built car at the track.but you will get beat by stronger cars. if you bracket race it you can run it against similar cars.but then your skill at leaving consistently comes into play.
#28
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Car: 1991 Camaro RS
Engine: Built TBI 350
Transmission: T-5
Axle/Gears: 3.42 Posi
Re: Built 350 estimates?
as mentioned earlier .you cant have it both ways.build it for the track,OR street.you CAN drive a track built car on the street.but it will eat your lunch ,and quick. and you CAN drive a street built car at the track.but you will get beat by stronger cars. if you bracket race it you can run it against similar cars.but then your skill at leaving consistently comes into play.
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