89 TPI PROM q within
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Member
Joined: Jul 1999
Posts: 421
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From: Norfolk, VA
Car: 1985 Trans Am
Engine: 305 TPI
Transmission: 700R4
89 TPI PROM q within
I have heard that I would be better off unplugging the C/S injector and switching out my PROM with one for a '89 car. However, when I called the dealer yesterday to order the prom, he told me that they didn't make any proms that year for a 3.27 rear end, so I can't use it!! If I do go ahead and buy the prom, is there a way to change the gear ratio and to disable the VATS?
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Kevin Irving
85 Trans Am WS-6, 305 TPI, custom burned '86 PROM with '87 "165"ECM, Accel Supercoil & 8.8 Wires, MSD 6AL, Aluminum Driveshaft, Wonderbar, TB Coolant Bypass, Ported Plenum, Modified MAF, Syclone Fuel Pump, JET Airfoil
15.556 @ 86.65mph, Nov 10, 2000.... I know it sucks.. but it will get better!
http://www.geocities.com/transam85tpi/
Member - The Tidewater Trans Am Club, Norfolk VA http://www.geocities.com/ttacva/
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Kevin Irving
85 Trans Am WS-6, 305 TPI, custom burned '86 PROM with '87 "165"ECM, Accel Supercoil & 8.8 Wires, MSD 6AL, Aluminum Driveshaft, Wonderbar, TB Coolant Bypass, Ported Plenum, Modified MAF, Syclone Fuel Pump, JET Airfoil
15.556 @ 86.65mph, Nov 10, 2000.... I know it sucks.. but it will get better!
http://www.geocities.com/transam85tpi/
Member - The Tidewater Trans Am Club, Norfolk VA http://www.geocities.com/ttacva/
Senior Member
Joined: Mar 2001
Posts: 629
Likes: 10
From: New Yuck
Car: Non F-body :(
Engine: Pontiac 301
Transmission: TH350
If I remember correctly, the P4 ECMs read the speed adjusted via gears in the transmission tailshaft, not adjusted in the ECM. Your rear gear should not matter, especially for a MAF car. I'm not 100% sure on the MAP ECMs, but I believe they're the same.
Go ahead and order the prom if you're really set on it... but you could just buy burning equipment and make your own with the ARAP code as a starting point. You'll have to get a PROM burner anyways to disable VATS in the chip.
Go ahead and order the prom if you're really set on it... but you could just buy burning equipment and make your own with the ARAP code as a starting point. You'll have to get a PROM burner anyways to disable VATS in the chip.
Supreme Member
Joined: Oct 2000
Posts: 1,052
Likes: 0
From: Lima, Ohio
afgun is right.
I'm running god knows what "code" i am running in my car. Its a combo of the stock 89 305tpi manual tranny iroc chip along with the spark tables of the ARAP bin. It runs pretty good, well it runs ok.
But to answer the question, yes it will work just fine. I'm running 3.73 in my cable driven t5.. seems to work ok.
Brendan
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1987 IROC-Z L98,SuperRam,EB 6085's,LPE 219/219 Roller, Crane 1.6RR, EB TPI Base, 58mm TB, ADS 24#, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, MSD 6AL, MSD Blaster 3, Aluminum DS, 94 Disk Rear, Adjustable Valve, Precision 3.73 Gears, Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,
To see the ROC, Check out the webpage Here
I'm running god knows what "code" i am running in my car. Its a combo of the stock 89 305tpi manual tranny iroc chip along with the spark tables of the ARAP bin. It runs pretty good, well it runs ok.
But to answer the question, yes it will work just fine. I'm running 3.73 in my cable driven t5.. seems to work ok.
Brendan
------------------
1987 IROC-Z L98,SuperRam,EB 6085's,LPE 219/219 Roller, Crane 1.6RR, EB TPI Base, 58mm TB, ADS 24#, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, MSD 6AL, MSD Blaster 3, Aluminum DS, 94 Disk Rear, Adjustable Valve, Precision 3.73 Gears, Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,
To see the ROC, Check out the webpage Here
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