Black2003SS Posted July 25, 2007 Report Share Posted July 25, 2007 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, an dI 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. Quote Link to comment Share on other sites More sharing options...
SSThunder Posted July 25, 2007 Report Share Posted July 25, 2007 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, an dI 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. The radix does whistle some but you will get use to it. I thought it was pretty loud till I drove the truck for a week or so. I put the 3.0 pulley on and noticed the whistle again but I'm sure I'll get use to it. Quote Link to comment Share on other sites More sharing options...
Black2003SS Posted July 25, 2007 Author Report Share Posted July 25, 2007 Ok...so its normal...god its loud with the windows down... P.S. Thanks for the heads up on the 2.9" pulley...cant wait to put that puppy on... Quote Link to comment Share on other sites More sharing options...
kelleyperformance Posted July 25, 2007 Report Share Posted July 25, 2007 (edited) i have no whistle.... what you are describing does not sound normal. the radix has a few vaccum barbs and such on it.... a few on the j-tube, and a few on the back of the j tube. check all of these and make sure they are either capped off or connected to something. then check your PCV system, one vent on each valve cover. the passanger side vents from the intake tube, and the driveside vents from the blower case. last, check the little nipples on the rear of the blower manifold, all the way back, right below the back of the j-tube. these are your only possible vaccum leaks. you could also have an improperly adjusted bypass valve Edited July 25, 2007 by kelleyperformance (see edit history) Quote Link to comment Share on other sites More sharing options...
SSThunder Posted July 25, 2007 Report Share Posted July 25, 2007 I wonder if the belt or a pulley is causing the noise. Quote Link to comment Share on other sites More sharing options...
Black2003SS Posted July 25, 2007 Author Report Share Posted July 25, 2007 How do I fix the bypass valve if that is the case? Quote Link to comment Share on other sites More sharing options...
.justin. Posted July 25, 2007 Report Share Posted July 25, 2007 Every Radix'd truck I've ridden in/driven has had a whistle as the bypass valve is closing (edge of boost/vac). I'd say it's normal. Quote Link to comment Share on other sites More sharing options...
kelleyperformance Posted July 25, 2007 Report Share Posted July 25, 2007 i dont know how, magnason is supposed to do that from the factory..... have you checked out all those locations i gave? Quote Link to comment Share on other sites More sharing options...
Black2003SS Posted July 25, 2007 Author Report Share Posted July 25, 2007 Being that I didnt put any expansion foam in my fender well, it is just probably mroe pronounced? I have a couple of other things that I am going to chekc out. I found out that older model j-tubes (mine is used kit) had an issue with the the machine surface on the TB surface with rough edges, the new edges are rounded off a little and reduce the whistle noise, I might try that as well. I just hope its not the bypass valve because my understanding is I have to send the blower to magnacharger to get it fixed. Oh well.. What kinds of things should I look for? I only have 1* KR at the 1-2 shift so far and boost seems normal and so does idle and vacuum...so as long as I stay on top of those things, I should be ok right? I'm going to pull my plugs and check those out after 100miles of driving, that will tell me alot as well. Quote Link to comment Share on other sites More sharing options...
shakesvho Posted July 25, 2007 Report Share Posted July 25, 2007 A friend had this problem a few 3 years ago it was his j-tube, he took it off and sand down the ridge on the inside, it worked Quote Link to comment Share on other sites More sharing options...
zippy Posted July 27, 2007 Report Share Posted July 27, 2007 I would certainly be looking into the bypass valve just to make sure that there isn't any vacuum leaks there. You should be able to similate that by loading it in gear with the brake and throttle. Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted July 28, 2007 Report Share Posted July 28, 2007 I would check the bypass valve/tube......when I had my GTP(Eaton GenV M90 w3.4" pulley) I had a high pitched squeal at idle once. The supercharger bypass valve tube popped out of the intake bellows...pushed it back in and the noise was gone. I must not have pushed it in all the way after installing the SLP CAI...... Quote Link to comment Share on other sites More sharing options...
Black2003SS Posted July 28, 2007 Author Report Share Posted July 28, 2007 Other than the tubes, how would I check if the bypass valve is functioning properly or bad? It visually looks fine to me... Quote Link to comment Share on other sites More sharing options...
moregrip Posted July 29, 2007 Report Share Posted July 29, 2007 (edited) it's a problem caused by the sharp leading edge of the TB flange on the J-Tube when running a CAI (doesn't happen with stock installs as the system is designed for) . A little rounding of this edge will take it away. The inner ridge on the J-Tube sounds like a possibility as well, but I would start with whats easy Edited July 29, 2007 by moregrip (see edit history) Quote Link to comment Share on other sites More sharing options...
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