As far as turbos spooling, if they are chosen correctly, they make power down low, but I consider 'down low' to be in the 2500-3000rpm range. Even from idle, with properly sized turbos, it is a very small frame of time between then and full boost at 3000rpms. Of course if you have 1500hp worth of turbo(s), its not going to spool at 2500-3000rpms, but if you are looking for that kind of power level, that is usually a non-issue.
And yes, you are correct, I was talking about a torque curve for a turbo after it has spooled. Many dynos don't register properly below 3000rpms anyway. On the street, a system setup for boost at 2500-3000rpms is about right, because thats right where your engine spends a lot of its time so you're already in the spool range or very close to it. I mean when you floor it, how long does it take to go from 1500rpms to 2500rpms, not long. It all comes down to the power level and purpose desired for the application. You can make a setup that will spool right off idle, but don't expect 800hp out of it.
Anyway, as I said, I was only trying to help the person asking, not turn this into a turbo thread or supercharger debate.
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Rad Craig,
Induction Concepts
High Performance, Twin Turbo Systems
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08-11-2005, 04:31 PM
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