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305 tpi formula does it exist??

Old Jan 20, 2008 | 08:42 PM
  #1  
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305 tpi formula does it exist??

well does it?? tpi formula firebird i know the 350 tpi but i'm getting flak on a 305 tpi formula anyone??
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Old Jan 20, 2008 | 10:22 PM
  #2  
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From: Glenbeulah, WI
Car: 1988 Firbird
Engine: 406
Transmission: T-56
Axle/Gears: 4.10
Re: 305 tpi formula does it exist??

I am not sure if I understand your question but if I do this is my answer. GM made 305 TPI Formula Firebirds so they do exist. My car was a 1988 305 TPI 5-speed car.
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Old Jan 20, 2008 | 11:22 PM
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From: Minneapolis, MN
Car: currently a 91 G92.
Engine: 305TPI
Transmission: Borg Warner WC 5 speed
Axle/Gears: 3.42
Re: 305 tpi formula does it exist??

Yes, it exists.
I have one. It is a 91 WS6 formula 5 speed.
I know that GM made two TPI 305 engines for the formula. I believe that they also put the 305 TBI in the formula as well.
There were the 305 TPI with automatic, which was rated at 205 hp and 290 ft-lb of torque, and the 305 TPI 5 speed, rated at 230 hp and 300 ft-lb of torque. The 5 speed 305 TPI car came with dual cats and the cam shaft from the L98.
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Old Jan 20, 2008 | 11:49 PM
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Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
Re: 305 tpi formula does it exist??

I have one too
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Old Jan 20, 2008 | 11:59 PM
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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: 305 tpi formula does it exist??

Originally Posted by Saculia
Yes, it exists.
The 5 speed 305 TPI car came with dual cats and the cam shaft from the L98.
ALL the FACTORY 1990-1992 TPI 305s had the L98 Camshaft, PERIOD, NO IFs, ANDs, or BUTs about it.
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Old Jan 21, 2008 | 12:39 AM
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From: Casselberry, FLA
Car: 88 V6 'bird/89TBI bird/85 T/A
Engine: 2.8/TBI/TPI
Transmission: V8 T-5/700R4 x2
Axle/Gears: 3.42 open/2.73 open/ 3.27 9 bolt
Re: 305 tpi formula does it exist??

My 87 Formula was a TPI 305 5 speed car as well. No dual cats, but it did have the L98 cam. No way for me to know if it was factory or not due to the age/mileage.
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Old Jan 21, 2008 | 07:01 AM
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Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
Re: 305 tpi formula does it exist??

Here's another one. My 88 Formula came stock with the 5.0L TPI.
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Old Jan 21, 2008 | 11:37 AM
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Re: 305 tpi formula does it exist??

my friend was arguing with me i informed him of a 89 formula 305 tpi car and he said there was no such thing so i wanted to prove to him they are out there cause he thinks he is the know it all about firebirds and trans-ams just wanted to prove a point to him
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Old Jan 21, 2008 | 06:00 PM
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From: Saskatoon, SK, Canada
Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
Re: 305 tpi formula does it exist??

Originally Posted by Fast355
ALL the FACTORY 1990-1992 TPI 305s had the L98 Camshaft, PERIOD, NO IFs, ANDs, or BUTs about it.
I thought only the 5-spd cars got the bigger cam?
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Old Jan 22, 2008 | 12:15 PM
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From: Minneapolis, MN
Car: currently a 91 G92.
Engine: 305TPI
Transmission: Borg Warner WC 5 speed
Axle/Gears: 3.42
Re: 305 tpi formula does it exist??

Originally Posted by Fast355
ALL the FACTORY 1990-1992 TPI 305s had the L98 Camshaft, PERIOD, NO IFs, ANDs, or BUTs about it.
If such is the case, why does thirdgen.org list two LB9 engines for the camaro and firebird for the time period stated above?
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Old Jan 22, 2008 | 08:30 PM
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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: 305 tpi formula does it exist??

Originally Posted by Air_Adam
I thought only the 5-spd cars got the bigger cam?
They ALL had the L98 camshaft from 1990-1992. Every factory 305 prom chip even has the same fuel tables in them.

Originally Posted by Saculia
If such is the case, why does thirdgen.org list two LB9 engines for the camaro and firebird for the time period stated above?
Exhaust WAS THE DIFFERENCE between the two. The G92 cars got dual cats and more power. The non G92 cars got the same exhaust setup that chokes into a HORRIBLE Y and 2 1/4" pipe that the TBI cars got.
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Old Jan 23, 2008 | 10:41 PM
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From: Minneapolis, MN
Car: currently a 91 G92.
Engine: 305TPI
Transmission: Borg Warner WC 5 speed
Axle/Gears: 3.42
Re: 305 tpi formula does it exist??

Originally Posted by Fast355
They ALL had the L98 camshaft from 1990-1992. Every factory 305 prom chip even has the same fuel tables in them.



Exhaust WAS THE DIFFERENCE between the two. The G92 cars got dual cats and more power. The non G92 cars got the same exhaust setup that chokes into a HORRIBLE Y and 2 1/4" pipe that the TBI cars got.
So how much power do the automatic 305TPI cars make without the dual cats? This web site only lists them at 205 hp. GM rated the dual cat system at only 10hp over the single cat system and the 305TPI T5s were rated at 230hp. I wonder where the rest of the hp comes from.
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Old Jan 24, 2008 | 05:23 AM
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Re: 305 tpi formula does it exist??

mines a 90 305 tpi stock as i can see since the hood says "5.0 fuel injected"
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Old Jan 24, 2008 | 06:17 AM
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From: Cincinatti OH
Car: 1991 L03 700r4 RS
Engine: 1987 WS6 Trans AM Lb2
Transmission: Th350 red neck Performance 3k stall
Axle/Gears: 95 Mustang 8.8 built with 3.73s
Re: 305 tpi formula does it exist??

I've got one with a blown 305 sitting in my driveway, I think they were more common than the Formula 350's.
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