Jacko3 wrote:Anyway, if you tune for less volume, what do you think that would do to the rpm??? Probably increase the rpm range where you get the most power and thus increasig engine temperature and possibly activating the speed governor or engine shut-off at redline? What do you think?
Tuning for less volume likely increases the restriction. How much can depend on how you try and reduce volume. However, RPM is independent of this as RPM is merely a count of how many rotations the cranks make in a minute at the speed the engine is turning. The rev limiter is going to be based on this without any care in the world for how much restriction the exhaust is imposing.
The speed limiter is based on the speed of the car. It does not care how much exhaust flow exists.
As for increasing the range of RPM's, I'm not quite sure of the context you mean this in. But if you mean you raise the range of RPM's (shift powerband up in the RPM range), then I'd disagree. Most modifations you'ld need to make that would reduce volume would decrease flow capability and likely cause a downward shift in the power band. If you mean broaden the range of RPMs in the powerband, then maybe. But in general, exhaust modifications are not going to make huge differences unless you make radical changes. This exhaust, I'd say is a pretty radical change from a stock, or even any of the major performance exhausts available for the Z. It makes little attempt to squelch noise.