Hello all~

I recently received a 1984 corvette with only 24,700 miles on it. Runs great and the body is pristine. It obviously has the crossfire injection and is completely stock. The car was a gift for graduating college and as such I am now a poor college grad. My question is: Are there anyways to increase the current 205 hp on the cheap, to let's say around 300 hp? My uncle, who has owned a few corvettes, said that there was an option on the '84 for an alternate ECM that gave the '84 245 hp and he said it shouldn't cost me more than $100 for such a chip. Problem is I can't find any of these at all on the web. So is there even such a chip out there, that i could buy and then just switch it out? I mean it's got 5.7 L V-8 under the hood, it obviously could go faster.

Thanks for your help

~Justin

P.S.~ It has an automatic trans

 

Sounds like a nice graduation present. There are no cheap ponies available,no chip alone will add 40hp.Enjoy the car as is for a while hang out here and read,read,read. The 84 is a one of a kind C4 with crappy HP unfortunately. There are mods that will help but they will cost $$$. I can recomend member CFI-EFI as a source for info on that year he is very knowledgable. Take your time and save some money up for mods. Congrats.

 

The Crossfire Injection Vault has a wealth of info. Their tech section is full of good stuff and is dedicated to the CrossFire only. But, as previously stated, $100 bucks won't buy much if any HP. I recently got mine and spent $1000 bucks just doing the basics like replacing the tires, all the fluids, wires, plugs, cap, rotor, egr, etc. Still have the fuel pump and filter to do. Once you get the the other web site check out replacing the fuel pump with one from an '85. However, don't forget to come back here as it is the best. Congrats on the new ride. http://www.crossfire.homeip.net/

 

I've gained alot of cheap performance out of my car just by doing maintenance. Replace plugs, (possibly wires) replace air filter, clean throttle body, check for vacuum leaks, find and clear trouble codes, check tire air pressure, clean fuel injectors....
My car doesn't feel any faster, but I have already gained a couple MPG over what it had when I bought it.
I know I'm stating the obvious, but these are hard lessons that I have only just learned recently.

 

Doubt very much if there is a $100 HP gain chip; however, just for the fun of it, go to the "Scan and Tune" section and post your question. The tuners who hang out there might be able to enlighten you. LOL.

By the way, nice graduation gift. Curious to know where it was stired for all these years.

Joe B.

 

It has been too long for your uncle. Later C4s came with 245 hp, but they were TPI cars and had more differences than just the chip. there was no such option. Hypertech sells a chip. It made my car go slower. Don't waste your time.

The one of very best modifications you can make for power can be less than $100.00. It is porting the intake manifold. In case you hadn't guessed, the weak link in the Crossfire chain is the manifold.

It's OK to check it out...Just don't do it. IF your pump is operating correctly, a different fuel pump will give you nothing. If you have any doubts, check out your pump. If it is doing it's job, save your money. If it can't keep up, an '85 pump is a good idea as a replacement. There is a lunatic fringe that believes that by supplying a greater volume of fuel than the engine can use, at a pressure higher than the one the regulator already has to decrease, that there will be a power increase. I'd like to hear the logic on THAT one. All the claims of increased performance come from people that needed a pump in the first place, but who didn't have the ambition to check the old pump.

What you will learn is that the old, 1984, ECM is so old and slow, that it isn't worth messing with. None of the professional tuners will touch the '84 chip. You will learn, if you delve deeply enough, is how to swap in a later ECM.

There is quite a little bit you can do to improve the Crossfire. It is mostly a labor of love and a DIYer's project, because there isn't much "off the shelf" or prepackaged solutions available. It takes a little thought and the application of basic principles. With a Crossfire, it's more than just ordering the "trick of the week".

 

previous crossfire vette. 350 cid, xram, 2.0 TB's, 454 injectors, edel rpm aluminum 64 cc heads, crame 2040 cam 210/216 @.05, crane roller rockers, ceramic hedman 1 5/8 headers, dual exhaust/crossover, hooker aero chambers, 7747. Innovative WB.
CHANGES COMPLETED 10/13/2004:
7.4L TB on Holley TBI manifold(Projection), Summit AC with K & N, Aeromotive FP reg, Comp Cams 224/230 @.05 114 LSA, Innovative input of tps/rpm data
8/20/2005 repainted red (of course)
9/2005 adding MAP input.

 

And... What did or does it run?

RACE ON!!!

 

Most of that makes no sense at all. Just drive the car as it is for a while and learn how to drive it, then when you have some money, come back and get some good advice.

 

He's right of course - which is why I guess I haven't done it yet. Their logic is that the stock pump is barely capable of providing the necessary 13psi (or whatever the exact number is). Thanks CFI-EFI for bringing me back to Earth.

 

"Barely capable" is good. It isn't easy to tell the difference between highly capable and barely capable. And it makes no difference. The operative word, here, is capable. The spec fuel pressure is 9 psi to 13 psi. If your pump will maintain whatever pressure your regulator is set at, under the most demanding conditions, it is fine. I installed a gauge and ran the hose underneath my windshield wiper blade to hold it so I could watch the gauge while I was driving. I took the car out for a 1/4 mile pass. I paid closest attention when the fuel demand was the greatest. I wound 2nd gear past 6000 rpms to about 6200. The needle on the pressure gauge never even quivered. If your present pump keeps up, there is nothing to be gained by a change.

RACE ON!!!