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

PCM pros/cons

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Old Dec 18, 2023 | 05:22 AM
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Default PCM pros/cons

I have a stock 95 with the factory performance automatic. How much does a PCM change the car? they claim 100 hp. How much does it really change the car and is it worth doing? I just enjoy driving the car. I’m not going to race it. Sometimes I just enjoy driving the car in more of a sport driving mode. taking corners faster than a normal car.

your thoughts??
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Old Dec 18, 2023 | 09:35 AM
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Originally Posted by Whrabbit
How much does a PCM change the car? they claim 100 hp.
Who is claiming that?

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Old Dec 18, 2023 | 12:48 PM
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The only way your getting 100hp out of a tune, is if you did headers, cam, catback, port the heads.... maybe!
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Old Dec 19, 2023 | 07:34 AM
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I agree, there is no way that you are adding 100 horses with just a tune.
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Old Dec 23, 2023 | 11:35 PM
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Originally Posted by RichS
The only way your getting 100hp out of a tune, is if you did headers, cam, catback, port the heads.... maybe!
Or nitrous oxide
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Old Dec 24, 2023 | 03:36 PM
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Tuning only provides the ideal timing and fueling, so if that's far enough out of whack for some reason (cam, heads, exchaust, intake, compression, whatever) then it could easily be a 100 hp improvement. In very very general terms 10% is more realistic as OEM tunes are again generally too rich at WOT (small difference in power... and generally too lean at steady state partial throttle) and could use a few degrees of timing above perhaps 4K RPM where it's less likely to be knock limited (bigger difference).
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