Squeal From Rb26 Plenum At Idle

[Scooby]

Recently got my 26/30 tuned, running about 22 psi. Just noticed at idle that there is a high pitched whistle coming from the plenum area at idle, seems to be about 1/2 - 2/3rds of the way along towards the firewall.

Goes away when I apply the smallest amount of throttle. Also goes away if I spray WD40 in the general vicinity. Was wondering if it might be a blown shaft seal due to the boost - although I bet there's RB26s running more boost than that with no problems.

Anyone had this before?

Cheers

[R31Nismoid]

Did you take the plenum off or anything during the build?

Perhaps the gasket isn't sitting flush and a slight leak - sounds pretty much like what you are describing

[Don Dada]

As said above^^^

Try some carb spray instead and see if the idle changes. If it does its sucking air in, and u will be able to find the spot a little easier.

[Scooby]

Did you take the plenum off or anything during the build?

Perhaps the gasket isn't sitting flush and a slight leak - sounds pretty much like what you are describing

yes it was removed. no problems until recently when the boost was increased and hence my suggestion it might be related, except that it doesn't seem to occur with other GTRs running more boost.

i'll try the carby spray, hopefully its not a butterfly shaft seal.

Edited July 22, 2009 by Scooby

[tricstar]

had this exact same thing on my gtr running 19psi, but I don't think it is related to boost.. it just went away on its own..

this probibly won't help much but I did find where it was coming from,, hard to discribe but if you follow the two ajustable rods from the throttle to the manifold , mine was squealing from there..... don't know how this will help you .

but to answer your question I had it before

not sure if thats the butterfly shaft seal

Edited July 22, 2009 by tricstar