Originally Posted by
Jordan Y.
My understanding is that ball-bearing centers have very little to do with full-boost rpm (a ball-bearing center isn't going to make a turbo push 20 psi at 3700 rpm instead of 4000 rpm) but are all about transient response- the time from 0 boost to full boost when you're in the meat of the turbo's effective range. So a ball-bearing turbo won't drop your full-boost rpm from 4000, but if you are cruising at 4500 and go WOT the ball-bearing turbo will spin up to full boost almost instantly. This sound accurate?
Yes, that sounds accurate and can be backed-up by the graphs showing the difference in spool up between the two...they both end up at the same peak RPM.
Some kickass articles I found and read:
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Note that the following two are from 2002, above are from 2006:
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Punx: I love learning new things, especially when this is the field of engineering I'd like to go in to...I feel sorta stupid now looking at it...its pretty far above me