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ZZ4 Crate engine with 1989 Tpi upper

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Old 06-04-2012, 11:34 PM   #1
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Join Date: Aug 2008
Location: wausau WI
Posts: 29
Car: 1992 25th Anni. camaro
Engine: 5.7 liter ZZ4 swap TPI
Transmission: T56 (manual 6 speed)
Axle/Gears: corp. disc GM 10 bolt, 3:42

ZZ4 Crate engine with 1989 Tpi upper

Got a ZZ4 crate engine installed last year in a 1989 camaro. GM dealership build and install. It has 30lb injectors, and a Fast chip made to run it. everything else is stock except the exhaust. It has hooker headers, 3inch y pipe and an 3.5" American Thunder Exhaust system. It has 3:42 gears and a Retro fit T56 trans. The car runs low 13's. since last year I put on an adjustable fuel pressure regulator. Just wondering what fuel pressure psi is recommended? Anyone have a ZZ4 swap with TPI would love some input on this matter. Also Bought a stock Throttle Body bored to 52mm. I put a new IAC sensor on it and dialed the TPS to .59 at Idle. Since doing this the car idles like crap about 500 rpm cold when it warms up its running 1000rpm. It also surges at idle. What can I do to fix this problem? Please help!
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Old 06-05-2012, 12:00 AM   #2
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Join Date: Nov 2001
Location: Canada,Ont
Posts: 1,772
Car: 1987 TransAm Ttop
Engine: 2005 LQ4
Transmission: Ls1 T56
Axle/Gears: 3:27

Re: ZZ4 Crate engine with 1989 Tpi upper

Did you do an iac reset after adjusting the tps and changing the iac sensor? If not I would start there. Fuel pressure at the rails is usually between 45-50psi for tpi systems.
Lq4, On3 78/75 turbo, VsRacing 33x12x4 intercooler,Godspeed 50mm bov/50mm wastegate 12psi spring,Tsp 228R cam kit, .030 milled 243 heads, Potz p/p throttle body, ls6 intake, lS7 maf, granatelli solid core plug wires, stock t56,Flipped truck manifolds w/vbands, 2.5" crossover/merge pipe,3" downpipe,Qtp 3 inch cutout, Gmmg muffler, Eibach sportline lowering springs, TDS Wonderbar, stock 3.27 gear
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