Quoted:
No big deal...just thought I would ask.
Thanks for the info.
medcop
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Hey want you want is a straight forward answer, and not some judgemental questions or comments about speeding. So here is the straight dope.
All GM products after 1997 have an onboard Primary Control Module {PCM} that is programmed with the OBDII interface. The OBDII is a newer more adaptable PCM that monitors mmany engine parameters faster, provides better monitoring information for the mechanic, and is [b]flash programmable![/b]
Yes it is true that most GM vehicles are speed limited. The only ones that aren't are like my 1997 WS6 Pontiac Formula Firebird. And yes, it [i]does have Z-rated tires[/i] which is one of the reasons it is not speed limited!
But all engine controls are [i]RPM[/i] limited too. The effect of the speed or RPM limiter is to [i]interrupt[/i] engine function [b]momentarily[/b] to hold the speed or RPM below a set value. NO, it does not kill your engine, at least for more than a moment. If you persist in trying to accelerate over the value, you will experience a "stuttering" feeling in the engine as the limiting interrupts in a rapid-fire fashion.
If you desire to alter the parameters of the PCM program, you only have to reflash the chip.
This is done with a programmer. Hypertech is one manufacturer of such programmers. Or you may unbolt your PCM and send it to a speciality shop that does custom programming. This is what I did with mine. I sent it to Ed Wright who runs "Fastchips" in Oklahoma City OK. He specializes in LT1 & LS1 programming though.
HTH!