Quote:
Originally Posted by old greg
It has an effect in the real world in terms of time until boost, rather than rpm until boost on a dyno. You're right in that mass flow rate/pressure is what spools turbos, but a the improved off boost power will get you above your boost threshold sooner. Semantics, sure. But a higher compression turbo engine will be more "responsive" in the real world.
Umm.. He's right you know. Volumetric efficiency and pressure drop across the exhaust valves/ports has a huge effect on turbo spool.
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Wait old greg, but lower compression means exhaust gas has more pressure so wouldn't that help spool the turbo? Trading power at the crank for power to turbine.