I received a reply on another post recommending starting off with a stock '89 bin when I dive into this DIY prom. This got me to thinking, since my car had a JET chip installed before I bought it, and before the motor change, I wonder what would happen if I just put in a stock '89 5.7 eprom. Where would I look for one at? Dealer?

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'87 Formula WS6 - ZZ4 Crate TPI, ported heads, LT4 hot cam, 1.6RR, Accel runners, Accel lower, ported plenum, Edelbrock 58mm TB, pulleys, SLP cold air, headers and full exhaust, gutted cat, Walbro 255, Koni yellows, aftermarket panhard & LCA's.

 

Since the '89s don't have the coldstart injector and therefore have the coldstart enrichment included in the PROM, first thing you'd have to do is disable the coldstart injector.

(Just disconnect the wiring to it until you get a block-off kit).

I think the ARAP code is what you want, but I still have a copy of my original chip from my '89 350 IROC if you want that?

http://www.area51.org.il/~zaphodb/gmecm/anyj9304.bin
http://www.area51.org.il/~zaphodb/gmecm/ARAP.bin

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ZaphodB a.k.a Carl Andersson - zaphodb@faxancruisers.org
'89 Camaro IROC-Z 5.7L TPI - Mods under construction :-)
Custom ARAP Chip Under Development/180 t-stat, Edelbrock TES Headers,
SLP Airfoil, K&N Filters, Accel 8mm wires, Relocated MAT, AFPR @ 45 PSI

 

Actually I'm not set up to program yet, but was wanting to switch out the actual JET prom with a stock '89 prom. I don't know what the outcome will be, but if I can come up with a chip pretty cheap I'd like to see what the difference is.

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'87 Formula WS6 - ZZ4 Crate TPI, ported heads, LT4 hot cam, 1.6RR, Accel runners, Accel lower, ported plenum, Edelbrock 58mm TB, pulleys, SLP cold air, headers and full exhaust, gutted cat, Walbro 255, Koni yellows, aftermarket panhard & LCA's.

 

You won't be able to simply put a stock 89 chip in due the to VATS being enabled. Some custom tuning will need to be done to put the 89 code in.

Brendan

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1987 IROC-Z L98,SR,EB 6085's,LPE 219/219 SR Cam, Crane 1.6RR, EB TPI Base, 58mm TB, Stock T5, 30lb SVO, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, Aluminum DS, 94 Disk Rear, Adjustable Prop Valve, Precision 3.73 Gears, Weld in Sub-Frame Connectors, Hotchkis LCA's, KYB Shocks/Struts, Poly Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm, Big stereo, 730SD Conversion.

To see the ROC, Check out the webpage Here