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

Please Define "A Good Tune"

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Old Aug 29, 2006 | 11:48 PM
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Default Please Define "A Good Tune"

I have been reading several posts that talk about a "good tune".

With most of the engine parameters and controls not readily tweakable, and other then changing plugs, wires, and the usual cleaning of this and that ... can someone please define a "Good Tune"?

Thanks!!
Brian
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Old Aug 29, 2006 | 11:52 PM
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One you can sing in the shower.

But seriously, to me a good tune is one that will keep the car reliable.

I know of one tuner who cuts the O2 sensor wires and programs them out keeping the car in open loop indefinitely.

You also want to stay within emmission restrictions in your state, a good tune will keep your car clean while giving some more oomph.

I know of other tuners who can make your car fast and yet legal. That's what you want.
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Old Aug 30, 2006 | 12:32 AM
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Seeing you have a 92, you want to see Alvin at PCMFORLESS.com. He is in fact GOD when it comes to tuning these cars. From stock to mild and all the way to wild there are people running his tunes with great success. I personally know someone with a stock 93 that got a tune from him and the car picked up a tenth as well as runs a lot nicer. Personally I have a heads and cam setup that with a bad tune ran high 13's and barely idled. On Alvin's first try I droped over a second and picked up over 10 mph in the quater mile. This totally amazed me especially since the car idled and ran better than when stock
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Old Aug 30, 2006 | 01:07 AM
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Mr Mojo's avatar reminds me of a good tune......


Sorry this has nothing to do with your question.
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Old Aug 30, 2006 | 01:27 AM
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Usually when I say it, I'm talking about a chip thats been custom programmed to optimize the engine's performance, i.e., specifically tailored to your combination. Not all tuners are the same quality.
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Old Aug 30, 2006 | 08:16 AM
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Many, many things are changed in a custom prom. The proper air fuel mixture and correct timing curve for your combo is the main ingredient for power.
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Old Aug 30, 2006 | 12:00 PM
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Isn't locking the car in open loop bad for it? I'm assuming you'll using more 10% more gas, be running very rich and have plug fouling...
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Old Aug 30, 2006 | 12:22 PM
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Originally Posted by kopbet89c4
Isn't locking the car in open loop bad for it? I'm assuming you'll using more 10% more gas, be running very rich and have plug fouling...
Not at all, so long as it is tuned properly, which is a lot more involved if you choose this option. A wide band O2 is pretty much a "must have" at that point.
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Old Aug 30, 2006 | 01:23 PM
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Originally Posted by RED92LT1
I have been reading several posts that talk about a "good tune".

With most of the engine parameters and controls not readily tweakable, and other then changing plugs, wires, and the usual cleaning of this and that ... can someone please define a "Good Tune"?

Thanks!!
Brian
I'm sure you realize now by the previous responses that when we speak of a good tune, we are talking about changing those things that are not "readily tweakable." Of course for someone with the knowledge and the tools, it's fairly simple. And among the best, the results can be amazing. When I had my last engine tuned, it picked up 37 HP while on the dyno and driveability was returned to nearly as good as stock. Also mileage was as good as stock again. This was with a 350, 11.3 CR, fully ported heads and oversized vales, Hotcam, headers, etc., etc. I've recently installed a 388 and I'm really looking forward to taking it back to the guru who did it before. The car is running very strong already and I know it'll be even better when he works his magic again.
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Old Aug 30, 2006 | 02:58 PM
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Hi

Is the "good tune" only for those that had already done some mods such as cam and heads or can a stock car show a worth while improvement?

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Old Aug 30, 2006 | 05:14 PM
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There is some improvement to be had from a stock car as well.
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Old Aug 30, 2006 | 07:56 PM
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it starts, runs with no misfires, and your gas milege hasnt decreased
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Old Aug 30, 2006 | 08:56 PM
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Originally Posted by Corf
Mr Mojo's avatar reminds me of a good tune......


Sorry this has nothing to do with your question.
Hmm, Jan & Dean-Surf City
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Old Aug 30, 2006 | 08:58 PM
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Originally Posted by kopbet89c4
Isn't locking the car in open loop bad for it? I'm assuming you'll using more 10% more gas, be running very rich and have plug fouling...
The majority of the cars this was done to were almost 100% for the race track only.

How it was discovered was that the first tuner did it. Something went wrong, brought to a second tuner who then called a third tuner who verified that the first tuner did it, since he had also worked on cars done by tuner one and discovered the same thing.
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