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i guess it could work better over a stock tune but i personaly wouldnt do it . i would contact a local tuner in your area and have the car dyno tuned .
No 2 cars are the same. There are far to many variables & factors that require the time & attention of a tune on a chassis dyno to get it right. That said, a mail order tune can help in a generic sort of way & you can keep sending the PCM back until you get it close.
would it be possible to datalog the PCM first then send it off to the mail tune? this way it would give the tuner some background to work from and get a better tune.
(I might be answering my own question here but)
i guess you would need some type of software/hardware first to do that?
Myself and a bunch of buddies in my Vette Club all sent our PCM's down South to a non-forum vendor for tuning and all were extremely pleased with the new performance, improved fuel economy, great price, 24 hour turnaround and free future upgrades. Email me or IM me if you want to discuss or the vendor name. For the price we paid we thought if he turned off our CAGS alone it was worth it.
I think a dyno tune isn't worth the money over a mail order tune unless you have forced induction. In the last GM High-Tech Performance they finished a serious 383 LS1 and got a mail order tune from Thunder Racing; then they bought some tuning software and tuned it themselves. They said the following,
"Also intriguing is the fact that although we performed slight adjustments to fuel and timing over Thunder's maps, torque and hp remained nearly identical."
I haven't tuned my Corvette yet but for my 94 z28 the mail order tune was like $250 unliminted tunes with the cable; dyno tunes are about $500 for a one shot deal. Then if you change cams or something, there's another $500.
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