jayk

My question is really about how active the secondary turbo is before it starts contributing to boost? My secondary makes a loud screaming/whistle type of noise at exactly 4.5k until redline which I suspect means the turbo is going bad, but wouldn't it also make this noise during pre-4.5k spool up if there is something physically wrong with the turbo?

If the the secondary is fully boosting before 4.5k, but venting to the atmosphere until some thing-a-ma-jig redirects the boost into the normal intake path, then I would guess that my noise is coming from one of the valves that is controlling where the boost goes...

Anyway, any info will be greatly appreciated.

Aristo

iTrader: (8)

Right before tranistion I'll see 2-3 psi on the secondary if its prespooling.