ZZ4 with TPI 89 Formula Questions
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Joined: Jan 2007
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From: Rhinelander, WI
Car: 89 Formula
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 9 Bolt 3.27
ZZ4 with TPI 89 Formula Questions
I just bought a 89 Formula with new ZZ4 motor installed by local GM dealership. Car was an original 305 TPI with automatic. It does have new headers, dual cats and new 3" exhaust all the way back. I will replace the 2.73 rear with a 3.23 shortly. What do I need to do with the TPI and computer to let it unleash all that power. Pretty much a dog when I drove it. Do I need more fuel pump pressure or just 350 TPI injectors? Then some computer work/prom? With the correct updates this thing should run nice and be realiable. Suggestions guys....
JP
JP
Joined: Apr 2005
Posts: 7,736
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: ZZ4 with TPI 89 Formula Questions
new ZZ4 motor installed by local GM dealership. Car was an original 305 TPI with automatic. What do I need to do with the TPI and computer to let it unleash all that power. Pretty much a dog when I drove it. Do I need more fuel pump pressure or just 350 TPI injectors? .
JP
JP
The ZZ4 cam responds very well to the usual TPI mods; big tubes , ported / siamised base , etc
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