boost gauge shows 0 psi at wot

Senna-F1 · 01-11-2020, 02:10 AM

How are you testing for boost leak?
Here is how I tested https://www.youtube.com/watch?v=-7ZPmLl_7xI

Are you saying the block off plate on the manifold was leaking? How did you test that?

0 PSI at WOT is actually not necessarily a problem with a centrifugal SC, it depends on at what RPM this is happeninig. Boost will = 0 at WOT below a certain RPM.

Does your boost gauge EVER see boost? Seb sees 4.5 which is coming from the MAP sensor in the manifold. Your gauge is being fed from a vacuum line coming off the manifold. If Seb see's boost, but your gauge never does, that might be a pinched/torn vacuum line.

Not sure why he only sees 4.5 psi though. Maybe your manifold not sealed, but not sure how you tested that it's OK.

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01-11-2020, 02:10 AM	#2 (permalink)
Senna-F1 Enthusiast Member Join Date: Jun 2016 Location: Cary, NC Age: 54 Posts: 425 Drives: 370SC,EliseSC,MR2T Rep Power: 51	How are you testing for boost leak? Here is how I tested https://www.youtube.com/watch?v=-7ZPmLl_7xI Are you saying the block off plate on the manifold was leaking? How did you test that? 0 PSI at WOT is actually not necessarily a problem with a centrifugal SC, it depends on at what RPM this is happeninig. Boost will = 0 at WOT below a certain RPM. Does your boost gauge EVER see boost? Seb sees 4.5 which is coming from the MAP sensor in the manifold. Your gauge is being fed from a vacuum line coming off the manifold. If Seb see's boost, but your gauge never does, that might be a pinched/torn vacuum line. Not sure why he only sees 4.5 psi though. Maybe your manifold not sealed, but not sure how you tested that it's OK.