Quote:
Originally Posted by AndyBees
T
I repectfully disagree with your assesment of the operation of a VNT15! Reading and hands-on are quite different.
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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.