turbo performance |
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turbo performance |
nsyr |
Jun 3 2004, 04:47 PM
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#21
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Because I Can Group: Members Posts: 314 Joined: 16-May 04 From: Tampa, FL Member No.: 2,073 |
I know there a few people out there with turbo 4's. Does anybody have any performance or reliability figures.
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lapuwali |
Jun 4 2004, 12:34 PM
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#22
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Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743 |
I'd think intercooling was essential with an aircooled engine. I can't imagine why someone would try to run no intercooler on a turbo Type IV.
With a proper intercooled setup, most turbo cars show about a 50% increase in torque for boost pressure of 50% over atmospheric, which is exactly what you'd expect. Double the pressure, and you get double the torque. The increase doesn't stay linear like this, and perhaps with an unmodified Type IV head it would drop off even before the 2x mark, but the rule holds up well for "normal" boost levels on street cars (below 20psi). And it's often torque, not peak HP, that really rises nicely in a good turbo setup. The current WRC cars, all turbo 2.0 engines, have an intake restrictor that clamps HP to 300hp, but they also make something like 500ft/lbs of torque! The area under the curve will continue to rise with boost pressure long after the peak has hit the ceiling. |
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