94 Corvette Performance Exhust
Thread Starter
Heel & Toe
Joined: Jul 2016
Posts: 23
Likes: 1
From: Monroe MI
94 Corvette Performance Exhust
I recently purchased a 94 Corvette and looking to up grade the performance a little. My question is what type/brand of exhaust should I consider, power chip recommendations and other low cost non intrusive components will get me the extra horse power and torque? 
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
A '94 is a first year PCM and there's no replaceable PROM - PCM requires "tuning" and again not a lot to be gained. Any of the "hang-on" devices for the PCM are maybe money wasted!!
If this is an A4 with a base 2.59 axle ratio MAYBE the greatest "seat of the pants" feel/"bang for the buck" would come from an axle change to the 3.07. If it's an M6 leave it alone.
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
with WVZR-1. The exhaust on the 94 is not very restrictive and you will gain no HP or performance by making a change. .....again. There is no performance chip available. The computer would have to be flashed with a new set of values. For a stock LT1, you will not gain much for the dollars spent. The only good thing would be to have the fan settings changed so they come on earlier to keep the engine cooler. Bolt on's will not offer much, unless you go to heads. Perhaps roller rockers. Just be for warned, the LT1 does not have timing marks to line up the valve train. There is a small triangle on the inside of the balancer hub. You turn the engine so the triangle is pointing up (a real PITA) and you have compression on #1. Roller rockers might (repeat might) add 5-7 HP, but you will also see about a 10 degree drop in oil temperature.
For your dollars, gears would be the way to go and higher stall converter if it is a automatic.
Thread Starter
Heel & Toe
Joined: Jul 2016
Posts: 23
Likes: 1
From: Monroe MI
Guys, thanks for weighting in on my question, unless my research failed me they do make a
CORVETTE JET PERFORMANCE ENGINE POWER CONTROL MODULE - MANUAL STAGE 2,
*Adds Up to 22 Horsepower
*Modifies Ignition Curve
*Recalibrates Air/Fuel Ratio For Maximum Performance
*Produces Firmer Transmission Shift Points
*Improves 1/4 Mile Elapsed Times
*Includes New Programming Port For Future Upgrades
The Jet Programmable PCM for Corvettes simply plugs in to the stock computer and the factory wiring harness plugs into the Power Control Module for instant horsepower. The Vehicle ECM looks at various sensors and processes this information to adjust spark timing, air fuel ratio and other parameters according to the information stored in the JET performance module memory. Re-calibrating this information tunes the engine for maximum horsepower and torque under a variety of driving conditions.
The results have been verified via a dyno.
I may have had the Power Chip confused with Power Control Module, also would a cold air induction increase help at all?
CORVETTE JET PERFORMANCE ENGINE POWER CONTROL MODULE - MANUAL STAGE 2,
*Adds Up to 22 Horsepower
*Modifies Ignition Curve
*Recalibrates Air/Fuel Ratio For Maximum Performance
*Produces Firmer Transmission Shift Points
*Improves 1/4 Mile Elapsed Times
*Includes New Programming Port For Future Upgrades
The Jet Programmable PCM for Corvettes simply plugs in to the stock computer and the factory wiring harness plugs into the Power Control Module for instant horsepower. The Vehicle ECM looks at various sensors and processes this information to adjust spark timing, air fuel ratio and other parameters according to the information stored in the JET performance module memory. Re-calibrating this information tunes the engine for maximum horsepower and torque under a variety of driving conditions.
The results have been verified via a dyno.
I may have had the Power Chip confused with Power Control Module, also would a cold air induction increase help at all?
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
Guys, thanks for weighting in on my question, unless my research failed me they do make a
CORVETTE JET PERFORMANCE ENGINE POWER CONTROL MODULE - MANUAL STAGE 2,
*Adds Up to 22 Horsepower
*Modifies Ignition Curve
*Recalibrates Air/Fuel Ratio For Maximum Performance
*Produces Firmer Transmission Shift Points
*Improves 1/4 Mile Elapsed Times
*Includes New Programming Port For Future Upgrades
The Jet Programmable PCM for Corvettes simply plugs in to the stock computer and the factory wiring harness plugs into the Power Control Module for instant horsepower. The Vehicle ECM looks at various sensors and processes this information to adjust spark timing, air fuel ratio and other parameters according to the information stored in the JET performance module memory. Re-calibrating this information tunes the engine for maximum horsepower and torque under a variety of driving conditions.
The results have been verified via a dyno.
I may have had the Power Chip confused with Power Control Module, also would a cold air induction increase help at all?
CORVETTE JET PERFORMANCE ENGINE POWER CONTROL MODULE - MANUAL STAGE 2,
*Adds Up to 22 Horsepower
*Modifies Ignition Curve
*Recalibrates Air/Fuel Ratio For Maximum Performance
*Produces Firmer Transmission Shift Points
*Improves 1/4 Mile Elapsed Times
*Includes New Programming Port For Future Upgrades
The Jet Programmable PCM for Corvettes simply plugs in to the stock computer and the factory wiring harness plugs into the Power Control Module for instant horsepower. The Vehicle ECM looks at various sensors and processes this information to adjust spark timing, air fuel ratio and other parameters according to the information stored in the JET performance module memory. Re-calibrating this information tunes the engine for maximum horsepower and torque under a variety of driving conditions.
The results have been verified via a dyno.
I may have had the Power Chip confused with Power Control Module, also would a cold air induction increase help at all?
It's "your money" - "your decision"
Last edited by WVZR-1; Jul 28, 2016 at 07:51 PM.
Race Director
Joined: Dec 2002
Posts: 13,348
Likes: 233
From: SCMR Rat Pack'r Charter Member..Great Bend KS
For the average-running stock-motored C4, a chip "might" get you 2-3hp. It might also lose you 2-3hp. Even with a set of dyno runs, you'll never know what it will do to your engine.
It WILL lighten your wallet, though.
Thread Starter
Heel & Toe
Joined: Jul 2016
Posts: 23
Likes: 1
From: Monroe MI
Why would many forums and or articles suggest these changes if they will not do as stated in all the replies...They are not making any money they are reporting the technical data. I guess I am more confused now than ever...any suggestions to improve HP/Torque without giving the bank away?
Pro
Joined: Sep 2014
Posts: 588
Likes: 35
From: Smithfield VA
Why would many forums and or articles suggest these changes if they will not do as stated in all the replies...They are not making any money they are reporting the technical data. I guess I am more confused now than ever...any suggestions to improve HP/Torque without giving the bank away?
When I first got my '92 Vette almost two years ago, I was feeling the same way as you are. Here's my thread and how it was explained to me. https://www.corvetteforum.com/forums...or-92-lt1.html
Best tip I can give about getting advice here. Some of the people here can come across as Richards, but for the most part, they are honestly interested in helping a fellow Vette owner get their car right. Kinda like getting advice from your big brother. Yes he'll screw with you and joke you, but in the end, he does want only the best for you.
Last edited by 1stVetteFinally; Aug 1, 2016 at 11:34 AM.
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Thread Starter
Heel & Toe
Joined: Jul 2016
Posts: 23
Likes: 1
From: Monroe MI
Sponsorships and advertising is why. The LT1 with it's stock components was tuned very well from the factory. Like others have said, you can't get much more from an LT1 without doing major upgrades. The least expensive upgrade you can do that will actually increase HP would be upgrading to a hot cam and 1.6 roller rockers. The LT1 exhaust and intake is the same used on the 400 hp ZR-1. If it's plenty for a 400 hp 5.7 liter, it will not restrict a 300 HP 5.7 liter in the least bit.
When I first got my '92 Vette almost two years ago, I was feeling the same way as you are. Here's my thread and how it was explained to me. https://www.corvetteforum.com/forums...or-92-lt1.html
Best tip I can give about getting advice here. Some of the people here can come across as Richards, but for the most part, they are honestly interested in helping a fellow Vette owner get their car right. Kinda like getting advice from your big brother. Yes he'll screw with you and joke you, but in the end, he does want only the best for you.
When I first got my '92 Vette almost two years ago, I was feeling the same way as you are. Here's my thread and how it was explained to me. https://www.corvetteforum.com/forums...or-92-lt1.html
Best tip I can give about getting advice here. Some of the people here can come across as Richards, but for the most part, they are honestly interested in helping a fellow Vette owner get their car right. Kinda like getting advice from your big brother. Yes he'll screw with you and joke you, but in the end, he does want only the best for you.
As I indicated I am new to owning a vette, its been my life dream and now as I get closer to retirement, the kids are gone its time for me to play a little.
Thanks again
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 764
my 2-cents, FWIW -- keep it clean, stock, well maintained mechanics, and in a proper state of tune, and enjoy the car. I know from a "fast and furious and the need for speed" standpoint, that sounds boring, but face reality. chances are you're not going to track the car, but use it for nothing more than a Saturday night cruiser. a stock, 300 horse, LT1, is an excellent street performer, and the stock exhaust is a decent flowing system. adding an aftermarket exhaust for a sound preference is about as far as I would take it. most of these add-on things are gimmicks. remember, horsepower sells cars - AND PARTS. I have a stock, 230 horse L98 - I can guarantee you, I can break any posted speed limit. besides, for the street, low end torque, and Z51 is all anyone needs - 
Pro
Joined: Sep 2014
Posts: 588
Likes: 35
From: Smithfield VA
Le Mans Master
Joined: Nov 2015
Posts: 7,865
Likes: 10
From: LaSalle IL
If this is an A4 with a base 2.59 axle ratio MAYBE the greatest "seat of the pants" feel/"bang for the buck" would come from an axle change to the 3.07. If it's an M6 leave it alone.
For your dollars, gears would be the way to go and higher stall converter if it is a automatic.
Going from a 2.59 gear to a 3.55 with a mild street converter was a night and day difference for me.
Thread Starter
Heel & Toe
Joined: Jul 2016
Posts: 23
Likes: 1
From: Monroe MI
I decided on a CORSA CAT BACK exhaust system and a SLP triple Air Intake. no other major mods in my future. Thanks everyone for keeping my mind straight. BTW, anyone know where I can find a good used Targa top/ Mine has crystallized and the coating is flaking badly.
Burning Brakes
Joined: Apr 2011
Posts: 917
Likes: 25
From: College Station Tx
I decided on a CORSA CAT BACK exhaust system and a SLP triple Air Intake. no other major mods in my future. Thanks everyone for keeping my mind straight. BTW, anyone know where I can find a good used Targa top/ Mine has crystallized and the coating is flaking badly.
Congrats on the car, and post up some pics.