Custom Prom

[dodgerroger]

I have a stock 1994 ZR1 but am considering mild modifications like Corsa exhaust, breathless Intake, 4:10 gears etc. My question is does a custom PROM chip make an appreciable difference on a stock car. If so, any recommendations? Thanks in advance.

[Fort94z]

I got my prom put in after I had some mods done, such as headers, B&B with x-pipe and P&P job on the top end. So I can't really answer your question regarding stock form but from what I was told, I don't think it would be a noticable difference in power but would help in areas such as cooling , (fans turn on sooner) also can eliminate your 1 to 4 shift light and thing along this line.

[Fort94z]

Oh, by the way I have a Doug Rippie chip. It was put in at the Vette Doctors when I had a little work done on the car. It was also burned to eliminate a code that kept being thrown. The chip also keeps the car on full power all the time, no need to turn the key :)

[dodgerroger]

Thanks for your opinion. What you said is largely the info I get from all sources in regards to a custom PROM on a stock engine. I think I'll wait on a custom prom until I finish all other upgrades.

[buddyboy]

I am looking at getting a custom PROM not so much for performance, but I would like the fans to come on much sooner. In stop and go traffic it just runs way to hot. Is this custom PROM something that I can install myself?

1992 ZR1 #330 White/White

[Nick]

Check out Haibeck's site for his custom PROM calibrations:

http://www.zr1specialist.com/HAT%20Web/products/calibration.htm

:thumbsup:

[Aurora40]

Is this custom PROM something that I can install myself?
I believe they are really easy to install, just flip over the ECM and unscrew the little access panel on the bottom. Then pop out the old prom and put in the new one.

[Jeffvette]

I am looking at getting a custom PROM not so much for performance, but I would like the fans to come on much sooner. In stop and go traffic it just runs way to hot. Is this custom PROM something that I can install myself?

1992 ZR1 #330 White/White

Two 10mm nuts that hold the PCM in place, flip it over. Then four 1/4" bolts that hold the cover on and then it pops in and out like PC memory.

[Z Factor]

Check out Haibeck's site for his custom PROM calibrations:

http://www.zr1specialist.com/HAT%20Web/products/calibration.htm

:thumbsup:

One thing to keep in mind with Haibeck's chip is that if you have headers, he will want to return the fuel mixture back to it's rich setting like your current stock chip. To do that, he will charge an extra $100 to take it back to 6% rather than the 3% he has his chips set for off of the self.
Mark has a great reputation, but his chips do not have any adjustments included in the purchase price like some of the other ZR-1 tuners. So when you order one from him, make sure you have your mods set by the time you order it, or you will be sending it back to him and it will cost you some extra $.

:cheers:

[buddyboy]

:dancing I want to thank all you guys for your replies. You answered all my Questions and athen some.:cheers:

1992 ZR1 #330 White/White

[91MinuteMan]

I put my Haibeck chip in @ a dyno facility so that I could do a before and after. I'm running a mildly modified engine just port matching of the intake runners and exhaust manifold and a Callaway catback exhaust. At the rear wheels, I picked up 5hp to 351 and 4ft/lbs to 348 at peak power over the stock chip. Mostly I wanted the cooling fans on at lower temp and the full power default the few hps & ft/lbs were a bonus.

[Aurora40]

How do you like the Callaway exhaust? Any sound clips? I really want to hear one in person. It seems like a nice system, though it's quite pricey.

[91MinuteMan]

How do you like the Callaway exhaust? Any sound clips? I really want to hear one in person. It seems like a nice system, though it's quite pricey.

I bought the car this past fall with the Callaway system already installed and I have never heard a stock exhaust system, meaning I have no basis for comparison (a circumstance that I will remedy come next year). The car was a replacement for a '71 coupe that had high decibel flowmasters. The Z is quieter on the highway but around town it may be a "pick 'em". As we get our 1st major storm of the season, the car is warm and cozy in its winter home. Maybe by spring I'll figure out how to post noise.

[Aurora40]

Cool, thx for the feedback on them. Are you planning on going back to the stock exhaust? Or are you getting another Z?

[cwmoss]

I just put the latest GM chip in my 94. It had an aftermarket chip in it when I bought the car. It runs sooo much better, although I have the dreaded "skip shift " again. I have a CAGS plug ordered and that will take care of Big Brother!:thumbsup: