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TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

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Old 09-28-2009, 12:36 PM   #1
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Join Date: Aug 2007
Location: Riegelsberg, Germany
Posts: 63
Car: TransAM
Engine: GM LO3
Transmission: TH700R4

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Car runs very very great ! I´m happy...

In the past, i changed some parts on my 88´transam. Last step (for the most the first step) was changing the exhaust system. I changed from 2,5" without cat to 3" with cat (catco hi flow). And it really puts some horses to my car !!

My setup is:

- headers with home made y-pipe
- catco hi flow cat
- Flowmaster American Thunder 3" catback
- ported 081´heads from a firebird 305 TPI with new valves and Edelbrock valve springs
- Edelbrock true timing chain
- LT1 cam from a 94´Camaro Z28
- Edelbrock 3704 intake manifold ( bored to 46mm )
- ported TBI-Unit with 55´injectors @18PSI
- Thomas1976 TBI kickass RamAir-Unit (very nice)
- The great EBL-System
- Zeitronix ZT-2 WidebandO2
- ACD241 fuelpump
- ACC Performance BossHogg Nightstalker Level II torque converter 2200-2800 stall
- Kevlar brakeband
- Raybestos clutches
- TransGo Stage2 Reprogramming Kit
- Corvette Servo
- .473 boost valve
- B&M transmission cooler

It´s a really nice setup. It runs very very great !!
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88´Pontiac Firebird TransAM 305 TBI A/T
New painted and built to Knight 2000 exterieur replica in 2006/2007. Cowl induction hood coming soon...
Ported 081´heads, 46mm bored Edelbrock 3704 intake manifold, ported throttlebody, open filter element, LT1-cam, Edelbrock valvesprings, Edelbrock true timing chain, ACD241 fuelpump @18 PSI, EBL, headers, Flowmaster 80 muffler, high flow cat.
Black interieur with black PMD-leather seats...
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Old 09-28-2009, 02:02 PM   #2
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Join Date: Dec 2008
Location: Norwalk, CA
Posts: 841
Car: 91 RS
Engine: 305tbi
Transmission: 700r4 2500TCI stall
Axle/Gears: 2.73

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Re: Car runs very very great ! I´m happy...

What you mean by home made y pipe you did the y pipe so you have long tubes
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Old 09-28-2009, 02:51 PM   #3
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Join Date: Sep 2006
Location: Greater D.C. area.
Posts: 209
Car: 89 Camaro RS
Engine: LO3 TBI
Transmission: 700R4 => TKO600
Axle/Gears: 3.42 Open Diff

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Re: Car runs very very great ! I´m happy...

I'd like to point out to people, that he has spend the money and effort to properly tune his car.
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Old 09-28-2009, 05:41 PM   #4
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Join Date: Dec 2008
Location: Norwalk, CA
Posts: 841
Car: 91 RS
Engine: 305tbi
Transmission: 700r4 2500TCI stall
Axle/Gears: 2.73

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Re: Car runs very very great ! I´m happy...

And yes he did now its time for him to enjoy his work
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Old 09-29-2009, 01:28 PM   #5
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Location: Riegelsberg, Germany
Posts: 63
Car: TransAM
Engine: GM LO3
Transmission: TH700R4

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Re: Car runs very very great ! I´m happy...

This is my home made y-pipe:



After this photo, i painted black the pipe...
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Old 09-29-2009, 02:37 PM   #6
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Join Date: Dec 2008
Location: Norwalk, CA
Posts: 841
Car: 91 RS
Engine: 305tbi
Transmission: 700r4 2500TCI stall
Axle/Gears: 2.73

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Re: Car runs very very great ! I´m happy...

Nice work i wish i could make my own
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Old 09-29-2009, 03:03 PM   #7
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Join Date: Mar 2009
Location: Columbia SC
Posts: 66
Car: 91 Camaro RS
Engine: 3.1 liter
Transmission: 700r4
Axle/Gears: positrac off an 83 T/A

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Re: Car runs very very great ! I´m happy...

me too...
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Old 09-29-2009, 03:12 PM   #8
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Location: Cincinnati, OH
Posts: 11,090
Car: '90 RS
Engine: LO3
Transmission: T5

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Re: Car runs very very great ! I´m happy...

Another fine example of a properly tuned mild LO3 set-up. Any track times or dyno info? How long did it take you to dial in the tune?
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