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Re: S4/91 200: which is faster?
At 1950 you have about 30% more time to fill the cylinders. The PR is lower
and so are the charge temps. There is less backpressure at the exhaust side
so the cylinders can fill more completely. The cam with 0 overlap was
designed for producing torque at the low end.
From: glen powell <firstname.lastname@example.org>
To: Linus Toy <email@example.com>; firstname.lastname@example.org
Subject: RE: S4/91 200: which is faster?
Date: Friday, February 27, 1998 10:42 AM
>hmmmm...my boost doesn't taper off - when it's working, it will hold 1.8
>clear to redline. You can hear the turbo varying in pitch as the WGFV
>and closes to maintain max. Are you mixing boost and torque? max torque is
>reached at 1950 rpm. I'm sure I have never seen max boost below 2500 rpm.
I've wondered about this...... how is max torque developed at 1950 RPM but
boost is not developed till 2500 RPM? How do they get that high max torque
max/high boost at 1950 RPM?