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Old 08-03-2006, 09:41 PM   #25
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I don't think exhaust tuning won't help much with FE because your limiting factor is pumping losses, which is related to rpm and gearing. Generally, manufacturers will tune an exhaust so that they can get a scavenging effect near peak hp, that way they can get the equivalent of a few extra psi of boost w/o a turbo. In order to do this you have to tune the exhaust based on each exhaust wave (acoustics, they travel at something like 800ft/s) so it will pull the exhaust gasses out of the piston near peak power, and allow even more air than normal to enter, and ultimately more fuel/power. I think this is why the drop off in torque/hp after peak isn't symmetrical compared to the increase...
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Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
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