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Old 07-11-2012, 09:08 AM   #16 (permalink)
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Join Date: Jul 2011
Location: Latvia
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volkswagen - '01 volkswagen Lupo
90 day: 66.51 mpg (US)
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Originally Posted by AndyBees View Post

I repectfully disagree with your assesment of the operation of a VNT15! Reading and hands-on are quite different.
I have rebuilt turbo on my car myself.

when I start my car turbo actuator right away pulls vanes into position to max boost. for my car it is 20% PWM signal for n75 valve. While driving when turbo spools up and boost rises, the actuator moves back an turn vanes to reduce boost up to 99% PWM signal for n75.

The only car i have seen which at idle is not pulling actuator for max boost is lupo 3L.

A lot of times I have seen that cloging of VNT vanes is due to bad (cloged) catalytic converter.

Last edited by amdown; 07-11-2012 at 09:14 AM..
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