PFF - Pennock's Fiero Forum, PDA Edition

Performance chip (Page 1/2)

chambe

APR 17, 08:55 PM

Purchased a 1987 Fiero GT. I think it has a performance chip. Does anybody know the location of where it might be installed? I want to remove it.

cartercarbaficionado

APR 17, 08:58 PM

quote

Originally posted by chambe:

Purchased a 1987 Fiero GT. I think it has a performance chip. Does anybody know the location of where it might be installed? I want to remove it.

you would need the stock chip. plus why?

chambe

APR 17, 09:52 PM

I don't know anything about the chip or its whereabouts. I purchased the vehicle from prior owner who is dead. My mechanic thinks the chip is affecting performance.

Dennis LaGrua

APR 17, 09:59 PM

Remove the two screws and small cover from the ECM. There you can pull the old eprom chip out ( gently) and plug in a new one that came from Fiero of the same model year with the same engine and transmission. All the so called performance chips for Fieros did was to increase the values on the acceleration enrichment table. They did nothing but decrease gas mileage. This was proven many years ago. The only thing that did increase horsepower on a stock 2.8L engine was porting of the exhaust manifolds.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Vintage-Nut

APR 17, 10:09 PM

AND the computer or ECM {Engine Control Module} is in the center armrest console....

1987 Fiero GT V6 6cyl Stock Chip
5-spd
P215/60R14 Tires
Federal {FBB2902} / California {HWU5176}

P205/60R15 or P215/60R15 Tires
Federal {APN0154} / California {APP0158}

Auto: Federal {FBA1819} / California {AATC4620}

https://gafieroclub.org/ECMgood/fieroprom.html

[This message has been edited by Vintage-Nut (edited 04-17-2025).]

chambe

APR 18, 06:17 AM

Thanks for the information. I am going to remove the chip if I discover it has one. You are very helpful. Appreciate it.

1985 Fiero GT

APR 18, 07:36 AM

quote

Originally posted by chambe:

Thanks for the information. I am going to remove the chip if I discover it has one. You are very helpful. Appreciate it.

Remember that this chip is what runs the car, if you remove it, you must reinstall the factory chip, for the same year/engine/transmission.

olejoedad

APR 18, 08:04 AM

If it does have a performance chip installed, it will affect performance - it will not run as well as it would with the stock chip.

Performance chips primarily hurt fuel mileage and hinder performance in the Fiero.

GM did an amazing job with the stock chip in our cars.

[This message has been edited by olejoedad (edited 04-18-2025).]

Dennis LaGrua

APR 19, 03:04 AM

The Fiero Store still stocks and sells the Hypertech Street Runner and Hypermaster "performance" Chips $119.95-$137.95 . Joe's comment is correct about the stock GM Chip.

82-T/A [At Work]

APR 19, 08:36 AM

The HyperTech chip isn't so bad. I had one, and honestly I don't think it really did much. But I had the ThermoMaster chip. It was designed to allow you to use the 160 degree thermostat with proper fuel mappping changes. It also (supposedly) optimized fuel mapping slightly in the mid-rpm. If you do have an aftermarket chip, I'd probably not be too concerned. In the Fiero, I don't think it really improves much at all (at least it was unnoticable to me). It does raise the rev-limiter as well (for what it's worth).

If you're having issues... I actually kind of doubt it's any kind of aftermarket chip. But like others have said... you can't just remove it unless you have something to put back in its place (like the factory one).

What are your symptoms/issues again?