I recently had a talk with a guy that rebuilds car and he advised me to get a performance chip on my computer.He said that every other mod would be useless if the old computer is still telling the car to do the stock procedures.It seems to make sense to me but i would like a little more input....Is it worth it and were can i get one and what do they usaully sell for??

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1988 Trans am.......best 600 bucks ive ever spent...305 5.0 but will save my lunch money and every penny to swap for a 350 tpi in the coming two years

 

Unless you've already done at least headers and an open element, it's not worth the money. Even then, the gain is really minimal. The time that you really need an aftermarket PROM is when you replace heads, new cam etc...

 

An aftermarket PROM like from Hypertech or JET does VERY little for your car. They add a few degrees timing and turn the fans on sooner. Thats stuff you can do yourself. Save your money for real mods.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

91Z is right.I bought hyprtech street and the only thing I like is my gas milage.When I bought the car I would get 19 mpg.Now I get 20 if I keep my foot out of it.On long trips I get 23 mpg doing 70mph. Before it would get around 21.For power I would suggest an open elenment,headers,ect.

 

I put on a HyperTech Thermomaster Fuel chip on my car, part # 11182, and I LOVE IT! I noticed a huge difference, I already had headers on it, but it overall helped everything, I would recommend it, sorry to disagree guys, but it definately helped me

Nate

 

 

If you are noticing a mileage improvment its not because of the hypertech chip. Their off the shelf calibrations (read: street legal) do not do a thing to part throttle calibration. THey only mess with WOT and only extremely mildly at that.

there is a difference between off the shelp "performance chips"
and a custom chip
a custom chip is taylored to the modifications you have done to your engine. you wont really need one of these until you start doing things like cam, heads, etc

dont waste your money

 

i bought a Jet 2 chip for my 91 with a 160 degree thermo and it did work well for mine, i can now burn out at any stop on a full tank of gas... this was before ram air, so it should get you something..

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91 RS, 305 TBI
-Jet Chip 2
-160 degree thermostat
-Spintech Exhaust
-Ram Air (custom)
- K&N airfilter
Future Mods:
-350 Ram Jet engine
-T56 tranny
-3.9.6 Possi Rearend.

 

oops forgot to say, its cost me about 150 out the door for chip and thermo....

 

I've got a Thermomaster Chip in my wife's '91, it makes very little difference in power on a stock engine & setup. Unless
you're going to put a better cam, heads, headers, better cold air intake or open element on that engine & yadi yadi yah, don't bother. I got suckered by the marketing aspect, that's why i've got one with no other mods. I can roast the tires medium-well and that's about it.

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DR Stevens
Car #1: my ride
1984 TransAm
305HO(L69) 95K & counting
750 cfm Q-Jet reman. by Holley
K&N filter
700R4/Superior shift-kit
3.42 rear/3.73 blew up!!
underdrive pulleys
Accel HEI Super-Coil
180 stat/hi flow water
pump/Jet fan switch
dual snorkel /w/ hood louver
3" exhaust of some sort
partial emissions delete
Stock-appearing radio /w/
10-disc changer
Car #2: My wife's ride
1991 Firebird/Formula
305TBI(LO3) 99K & smoking
K&N air filter
Hypertech Thermomaster Chip
more engine mods later
400W amp /w/ 12" sub

[This message has been edited by eightTfourTA (edited March 20, 2001).]