I have a loud very high pitched whistle, almost like tea pot whistle coming from underneath my hood. I dont know if I misses something, but its there. It is only present when I give it part throttle and there is still vacuum, once it passes from vac to boost, it goes away. Do I have a vacuum leak somewhere? I checked all of the clamps on the intake before the throttle body, and I did find one not seated properly, but fixing that didnt solve it. I would also think that if it was after the blower, not before, that I would have a boost leak and show less boost on the gauge. Any ideas? Or...is this high pitched whistle just part of the radix gig?


Thanks.

 

never heard a whistle before....you might want to check your install again, starting with the TB gasket and the intake gaskets. What RPM does your truck idle at? Is the whistle at idle or load?

 

I had the same exact problem.....a breather hose to the intake tiube was off.

 

I had a "whistle" after the Gatorback belt install when under a slight load. What belt ya running?

 

It is under a slight load. Idle is at 520-550rpms and steady. I know hte belt is not a gator back, its the one the guy sent me with the kit. Someone esle mentioned a boost bypass valve not adjusted properly. Is that the one they say not to pick it up by? I never picked it up by that, but who knows. Its only when there is vacuum on my boost boost gauge. Once the needle gets to 0 or goes into boost, the noise goes away.

 

If it is a used kit, there is a slight possibility it does not have the revised J-Tube that eliminated that problem. If the relief for the IAC has a sharp edge and not machined smooth then the whistle is from the J-Tube. Take the TB off and post a picture of the inlet side of the J-Tube.

 

Ok...I'll do that tonight. I think the kit is 3-4yrs old...came off of a 2003 ss...I even have the dinky intercooler and a 3.4" pulley originally. When you say relief...are you talking about the relief just above the circular opening into the j tube on the throttle body mounting surface? If so, I can tell you I clearly remeber seeing that was a sharp edge. Its like an oval shape that goes up towards the top TB moutning bolt right?

 

I would say you have an older unit that has the sharp edge. You can file it smooth if you would like, it is an easy fix.

 

If I'm going to file that, I should probably stuff a clean rag in the j-tube to prevent any filings making their way into the blower and vacuum it out well, clean it before re-installing everything.

 

you got it!