C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

HELP!please tune after procharger!

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Old Sep 15, 2005 | 01:39 AM
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Default HELP!please tune after procharger!

HI ALL I NEED SOME HELP WITH TUNING MY 94 AFTER PORCHARGER INSTALL, I THINK ITS RUNNING RICH, I BOUGHT DATAMASTER & MY LONG TERM COUNTS ARE 108 LEFT & RIGHT I THINK THEY NEED TO BE 128 & THE SHORT TERM COUNT IS 118-125
LEFT & RIGHT & SHOULD ALSO BE 128, I THINK I NEED TO BUY A EDIT PROGRAM BUT NOT SURE WHAT PROGRAM TO BUY.ALSO DOES ANY ONE WRITE A STEP BY STEP BOOK ON HOW TO DO THIS? ALSO WILL I GAIN MUCH IN POWER WHEN THIS ADJUSMENT IS DONE? SURE NOT HAPPY YET WITH THE CLAMED HP RATING THAT PROCHERGER CLAIMS! 485 HP, HA!!! ANY HELP IS GREATY APPRECIATED. REGARDS, DAVE .

Last edited by vettenut94; Sep 15, 2005 at 02:43 AM. Reason: PUSHED THE WRONG KEY AND JUST SENT THE STARTING
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Old Sep 15, 2005 | 10:59 AM
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Originally Posted by vettenut94
HI ALL I NEED SOME HELP WITH TUNING MY 94 AFTER PORCHARGER INSTALL, I THINK ITS RUNNING RICH, I BOUGHT DATAMASTER & MY LONG TERM COUNTS ARE 108 LEFT & RIGHT I THINK THEY NEED TO BE 128 & THE SHORT TERM COUNT IS 118-125
LEFT & RIGHT & SHOULD ALSO BE 128, I THINK I NEED TO BUY A EDIT PROGRAM BUT NOT SURE WHAT PROGRAM TO BUY.ALSO DOES ANY ONE WRITE A STEP BY STEP BOOK ON HOW TO DO THIS? ALSO WILL I GAIN MUCH IN POWER WHEN THIS ADJUSMENT IS DONE? SURE NOT HAPPY YET WITH THE CLAMED HP RATING THAT PROCHERGER CLAIMS! 485 HP, HA!!! ANY HELP IS GREATY APPRECIATED. REGARDS, DAVE .

Dave, is your engine stock or is it modified? At what RPMs are the fuel trims hanging at 108? Normally if a blower is installed on a stock engine the fuel trims are not affected during closed loop operation. If fuel trims are low (108) I would check the bypass hose. If that hose isn't connected or is leaking the MAF sensor will show more air flow than is really getting into the engine. This will cause the PCM to fuel for this additional air flow but the o2 sensors will see it as a rich condition and this would cause the PCM to take fuel out, hence low fuel trim numbers.

I use TunerCat for tuning the 94/95 PCMs. Also you will need to purchase one ECM definition file to work with the tuner program.

go here: www.tunercat.com

You can download the tuner program, but you have to buy the EE Definition file, TC will usually email the file within a couple of hours. The tuner program is $70 and the ECM definition file is $20. You can use the tuner program for 30 days before having to pay for it.
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Old Sep 15, 2005 | 10:32 PM
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vettenut94
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Tjwong: Thanks For The Reply, The Motor Is Stock But Does Have Some Small Mods Like Magnaflow Mufflers Crane Fire Ball Ignition, Msd Coil & Wires. The Long Term Counts (108) Seem To Be Fairly Steady At Most Rpm's It Will Fluctuate Slightly At Higher Rpm's And Then The Counts Seem To Go 117 Or So.

The Bypass Hose Is Connected And Functioning Properly.
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