After I threw in the open element...I still don't get any better acceleration. Is 9-10 seconds a common 0-60 time for a 305 RS with stock exhaust system? It's quick to around 35 MPH but then creeps up. Am I just expecting too much or is there something wrong? Would a new exhaust system help?

 

Mines a helluva lot faster than that dude. I get 0-55 in about 6 seconds

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1992 Pontiac Firebird (stock)
- 305ci V8 TBI / Automatic Trans / Every option, excluding leather
- Killer car audio system:

• Aiwa CDC-MP3 head unit
• Rockford Fosgate 360a2 amp
• pair of 12" MTX Thunder 5000s in a custom box
• Pioneer 3-way 6x9s, soon to add more more more!

 

Maybe I'm just a sucky driver and don't know how to do a 0-60 right???

 

Im not sure, but with a full exhaust an an open element you should be at low 7's for 0-60. I guess stock is 8.50-9.

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89 camaro 305 tbi, flomaster 3 chamber cat back, gutted cat, Edlebrock TES Headers, Exhaust cutout, Edlebrock open element, 160 degree T-stat, and a Stage 2 FastChip.

2 kicker comp 12"'s, polk for the rest. Phoenix gold xs2300 to subs, kicker impulse 404XI to 4 speakers, pioneer DEH- P7000R head unit, and finally a 12 disc changer. Full leather interior from http://www.MrMikes.com

 

no way, I get about 6.5 sec to 60 mph, assuming traction.

 

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Mine does 7.1 o-60 with mods below with a g-tech. Using a watch is a very ****ty and inaccurate way of doing it. One eyed Jack, how did you measure your 0-60. You must be using a watch too if you say your stock TBI camaro can do 6.5 0-60, that's a big bullshxt.

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Pat Hirsz
www.iit.edu/~hirspat/MyPage2.htm
88 305TBI
Mods:Hooker Aerochamber 3" exhaust, no cat,SLP 1 5/8" headers and y-pipe March pullies, no smog, 180 thermo,
14x4 K&N, 3.42 gears(open), Ultimate TBI Mods,AFPR,MSD(ignition,coil&wires),Edelbrock TBI Manifold, 190ltr/hr fuel pump,
Eibach springs with KYB's all around,
Harwood cowl hood, Z-28 wing, fresh paint(black)
120,000 miles, 5spd, T-tops
0-60mph-7.2s-Gteched

92 RS, 305TBI, auto, 3.08 gears, 180 thermo, glasspack (no muffler)

 

ya, sorry man. 6.0 is a lot faster than you think it is. Id have to say theres a bit of nonscientific error in those numbers due to a hopeful projection, then rounding maybe.

 

aprox 6.5 seconds with my friends stopwatch
0-60 mph, dry pavement

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1992 Pontiac Firebird (stock)
- 305ci V8 TBI / Automatic Trans / Every option, excluding leather
- Killer car audio system:

• Aiwa CDC-MP3 head unit
• Rockford Fosgate 360a2 amp
• pair of 12" MTX Thunder 5000s in a custom box
• Pioneer 3-way 6x9s, soon to add more more more!

 

.

 

.

 

thats cause u got 4.10 gears no stock 305 tbis gonna run 6.5, that more like a 350 tpi irocs time

 

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.

 

Why is no one mentioning elevation as a factor? The higher elevation the less hp the slower your car will go. Duh!

I'm sure at sea-level my car would be in the low 8 sec range (all stock auto TBI Iroc)
but at 3500 ft it's probably in the mid 9 second range. I don't buy that G-tech crap.

I kind of extrapolate from my 1/4 mile time slips.

 

So...is 8-9 secs normal for a stock RS?

 

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.

 

Yeah, AOL is RudeboySneah. I'd like to know what to do cuz I'm gettin' real fed up with this Real Slow.

 

....hmmm... I did a 9(0-60) and then an 11(0-60) in my v6.. Sound weird to you?

------------------
92 Camaro 305 TBI Automatic. 2.5 high flow cat and 2.5 pipes into3.5in tip, shift kit.

Future mods. Spark plug wires and plugs, tint. Headers, O.E., any other advise on getting to 300+ HP would be appreciated. Thanks

---------
System = Sony explode CD/MD receiver, Rockford 6x9 Fanatics, 4x6 Clarion in the front, 2 12" Hx2's(Rockford) in custom box(black carpet) 1 farad cap, 800x2= 932 total watts Rockford Amp 4gauge wire kit.

 

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I just bought an '89 RS. The car has many many mods... I was told that the only thing left to do to it is Nitrous. With the car the way that it is... It does 0-60 in and around the 6 second mark. So I'd agree with Jack. Also... My subaru legacy does better than 0-60 in 9 seconds.

 

whoa 9 seconds?dayum thats slow.my rs gets there in about 8.2 seconds.

------------------
-1991 camaro rs,dark red metallic,t-tops,stock 15inch rims
-stock L03 305,TH700R4,2.73's,only mod for now is a Flowmaster 80 series replacement muffler.
-best 1/4 mile times:16.2@84/2.37 60ft

 

hehe. CHOMP!
7. FLat.



------------------
91 FireBird 305 V-8
Edelbrock Catback, Fourth Gen Console. i have six cupholders. all for starbucks!
ghetto rigged cold air intake,
"My G/f Once Wanted To Break Up Because Of Competition With The Car."
GheTTo Riggers INC.
We Make Mcgyver look Like Crap
God Created The Earth, And Then Turned Up The Bass

 

For what it's worth, my 305 falls into the dog slow catagory, stop watched 0-60 left in drive 10.2sec, shifting my self 9.5 sec. 2.73 gears, open element, 670cfm tbi, dynomax catback. if your in the 6's & 7's, tell me how you got there so the rest of us can too.

------------------
'92 firebird t-tops
305tbi,670cfm tbi, 2 1/2" Dynomax catback, 9x3 K&N open element

 

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ws6 im sorry, i never answered you.
No i dont have AIM but I DO have ICQ.
my ICQ number is 73643696, and my email address is oej2k@icqmail.com

------------------
1992 Pontiac Firebird
- 305ci V8 TBI / Automatic Trans / Loaded
- MODS: Edelbrock 14x3 Open Element Air Cleaner, Dual outlet exhaust

 

my caprice had this problem, it turned out to be a clogged cat

 

Stock 305 TBI... 0-60 times are around 6.5-7 seconds. 2.73 gearing really hurts here. For a 0-60 you should only be going 1st gear and 2nd gear only to get a good time. In 2nd gear on an auto tranny 60 mph is only roughly 3600 rpm which a 305 tbi can easily do.

The hardest is 3rd gear climb in the 1/4 mile... stock, it takes a good 8-9 sec to climb up the next 30 mph...

With my 3.23 gears I can do 5. to mid-5 s 0-60 climbs. (I haven't really done an exact time for my car since the 3.23 swap)

Gearing calculation: mph divided by miles per rpm * rpm * gear ratio gives rpm necessary for that mph. I included the 26 inch tire speed since 15x7 rims were stock on the RS models 89 up. If you have the 26 inch tire set, its at 3500 rpm you hit 60 mph.

25.5 Inch tires (Stock 16x8 with 245/50/R16)
2.73 gears 27.35 mph per 1000 RPM

26 inch tires (Stock 15x7 with 215/65/R15)
2.73 Gearing 27.89 mph per 1000 RPM

700r4 transmission 2nd gear ratio 1.63

(60/27.35) * 1000 = 2193.7 RPM
2193.7 * 1.63 = 3575.9 RPM

How to get a good 60 mph time:

Make sure you have a tuned up well running LO3. It should have WOT shifts for autos at 4500 rpm for 1-2 2-3 shifts.

Get rid of as much wheel peel as possible... if the tires are spinning, the car ain't movin!

Leave it in 2nd gear only. This is 0-60, no reason for 3rd gear on 3.23 rears, let alone 2.73 gears. It is well within the RPM range of an LO3 at 2nd gear. 3500-3600 RPM for 60 mph in 2nd gear, no need to shift to 3rd.

Lastly, lighten up the car... its not really necessary, but having a crapload of stuff in the car ain't helping the acceleration and that's what we're working on here...

F=MA or A = F/M Cut the mass and the acceleration increases.. basic physics guys...

 

Stopwatch use is fine for doing before/after checks of modifications, and videotaping it vs time is a great idea. The GTech is both a stopwatch and an accelerometer but it avoids having to have a passenger with you.

All that said, note well that if you change the rear gears (say 2.73 to 4.10), or the tire outside effective diameter (larger diam tires to smaller diam tires) it means your speedo (if measured from the trans output, as on a 700R4) will be incorrect and no longer accurate for use. The Gtech will be fine because it measures acceleration vs time, and then intergrates accel to get velocity, and then integrates velocity to get distance... so the measurement will still be fine no matter what tires/gear you run.

FWIW changing 2.73 to 4.10, and running smaller diam tires (say 27" OD to 24 inch OD) gives you an effective 4.61 rear ratio. Unless you correct the speedo (per drive gears in the trans output housing) for these changes, none of the speedo-derived data will be any good. It will be waaay off, and not close to correct. The GTech, OTOH, will still be fine to within the accuracy of the GTech because it doesn't use the speedo at all.

And lastly, a car that runs 14.98 should have a trap speed of a lot LESS than 110 mph. And TBI 305s that are stock, in an Fcar, WON'T run 0-60 under 7 seconds. Note that no one else makes those performance claims. You need to lose a LOT of weight and you would need to modify the engine. Any physics-based computer tool (Cartest, QuarterJr) will show that, no matter what gear ratios you use. - Ken, thinking that speedo error is greatly fooling your data

 

With only going from 2.73's to 3.27 my speedo reads ~9mph high so even deeper gears its probably more like a 0-40 deal.
When my car was stock with higher miles it went 0-60 around 10 seconds. With a cowl hood, open element, 3.23's, gutted cat and better muffler it went 0-60 around 8.
Now it does it around 4.9-5.1(gtech)

 

You guys have fun answering this 13 month old question!

I'll just call you "Quick Draw," if you don't mind.

 

On a 2.73 to 3.23 swap, the actual speed will be 83.333333% of the speedo provided you didn't change the tranny speedo gears.

Its best to base your speed of your tach.

As long as your tach is not significantly off you will have very accurate results of when you hit 60 mph. (I checked mine with a dyno and tach was good all the way up to 6k rpm)

The calculation is simple and given that speedo are off by a good amount as soon as you change the tires from 25.5 inch tall to 26 inch, you are better off basing the speed of tach.

Basically you need to know this:

Tire height

16x8 with 245/50/16 = 25.5 inch
15x7 with 215/65/15 = 26 inch

If you have a different tire, then simply multiply the ratio (middle number, its a percentage ie 50%) by the width (first number in mm) convert to inches and add to last number to get tire height.

https://www.thirdgen.org/newdesign/tech/gears.shtml

Then based on rear gear gearing, choose the right mph, base off the proper gearing of 2nd gear only runs. Ie if auto put into 2nd not, d or od.

2nd gear is 1.63 ratio

The only other accurate way to get the 0-60 mph time is with a radar gun and stopwatch.

I'd go with the calculation since its easier to just hit the stopwatch and when it hits the desired rpm hit stop and you will probably have a margin of error less than 0.2 as long as tach is correct, you have good reaction timing and its 100% flat where you do this.

Elevation will alter times a good amount, I believe its around per 1000 ft increase its like 0.5 s worse...

 

Slade 1
correct me if I am wrong but in your tire height math above dont you have to multiply by 2 before you add the 3rd number (rim size)?
245/50 R16

245 X .50 X 2 = 245 mm convert to inches = 9.64566in + 16 =
25.64566 inch tire height

235/55 R16 = 26.1771 inch height

 

Yeah, when you do the math it comes out to that... but does a tire stay perfectly round when weight is applied? Either way, choose the size you are closest to as a guideline then you'll have pretty close numbers. Remember to follow the like I gave in order to get the right data.

 

...and Tazzo (better than g-tech) tells me I'm a high 5 second 0-60 car in high humidity. 5.9 to 6.0
I can believe that you can get a stock 305 TBI into the 7 second 0-60 if you geared the snot ouf of it with 4.88's out back and lightened the chassis along with lighter flywheel/driveshaft, posi, slicks, and higher stall TC . No really though, it's not that hard nor is it that easy to do, just takes some experience and focus on the real restrictions while knowing your limits (stock 305 TBI with _hp and _ft-lb).

 

Some of yall are running 9 second 0-60?????

My almost completely stock 91 easily runs low 7s. It's actually quicker than my mother's 98 Lumina LTZ with the 3.8L, and I think that car runs 7.2 stock. Now I know why the 350 guys harp on us so much. I didn't realize that such 305s existed. My first car was a 89' Caprice Classic w/ a 305 TBI and that was way faster than 9 seconds.

I seriously think something is wrong with yall's cars.

 

my old 305 used to take around 12 seconds to go 0-60. Heh... talk abount something being wrong... My new cheap *** gmgoodwrench crate 350 takes around 6.5 sec. to go 0-60. I still have the stock tbi and air cleaner so they probably dont flow much more then 400 cfm, plus i still have the stock muffler.

 

My car bone stock was definitely a 9 sec 0-60 car. My wife enjoyed beating me with her 98 Maxima which is magazine tested 7.2 sec car. Now with my mods I can pull 1 car length on her by 60 mph. So I am about a 7 sec car with gears and exhaust. My 94 GT Convertible (hate that blue oval) that I bought for resale is still faster than my Camaro. But my 99 LS1 TA kicks the crap out of all of them and its a magazine tested 5.2 sec car. I have yet to see a TBI car even come close to its performance. Jon Prevost is getting pretty close with a Vortec 350/330hp and he should be proud of his accomplishments.

 

i think with my old 305 my car ran a 10.2 @66 or 8 mph in the 8th, if i remeber right i was in the mid 7s 0-60