nic_f Posted April 19, 2004 Share Posted April 19, 2004 Guys, I need to pick your brains. I’m getting a strange high pitched sound on hard acceleration. It comes in as the turbo’s spin up, it sounds like someone letting the air out of a balloon by pulling the neck tight. If you back off the throttle, it stops. It’s only started happening since I changed the cams. Any ideas??? Link to comment Share on other sites More sharing options...
dude Posted April 19, 2004 Share Posted April 19, 2004 Err its not the Death whine is it ?????? Dude:flame Dev Link to comment Share on other sites More sharing options...
nic_f Posted April 19, 2004 Author Share Posted April 19, 2004 I don't know, but it doesn't sound like a whine. it's more like a high pitch suck...... Link to comment Share on other sites More sharing options...
LeeT Posted April 19, 2004 Share Posted April 19, 2004 sounds like the commonly asked question and the answer its an induction noise. lots of people have it. i had it on my 300zx and my supe. are you running after market filter? Link to comment Share on other sites More sharing options...
dk_supra Posted April 19, 2004 Share Posted April 19, 2004 Stock BOV maybe?? They usually leak Link to comment Share on other sites More sharing options...
Jake Posted April 19, 2004 Share Posted April 19, 2004 Originally posted by dk_supra Stock BOV maybe?? They usually leak Suuuuuuure they do. Link to comment Share on other sites More sharing options...
Matt Harwood Posted April 19, 2004 Share Posted April 19, 2004 Does it sound a bit like a pea whistle? Link to comment Share on other sites More sharing options...
Timwildman Posted April 19, 2004 Share Posted April 19, 2004 Originally posted by Matt Harwood Does it sound a bit like a pea whistle? How do pea's whistle? Link to comment Share on other sites More sharing options...
Matt Harwood Posted April 19, 2004 Share Posted April 19, 2004 Originally posted by Timwildman How do pea's whistle? Link to comment Share on other sites More sharing options...
nic_f Posted April 19, 2004 Author Share Posted April 19, 2004 no, I still have that lovely suping sound as it tryies to gulp lots of are but the is really loud and it drowns out everything else. and yes I do. Thanks Nic Originally posted by leett sounds like the commonly asked question and the answer its an induction noise. lots of people have it. i had it on my 300zx and my supe. are you running after market filter? Link to comment Share on other sites More sharing options...
nic_f Posted April 19, 2004 Author Share Posted April 19, 2004 Originally posted by leett sounds like the commonly asked question and the answer its an induction noise. lots of people have it. i had it on my 300zx and my supe. are you running after market filter? Not sure, but I have an after market one on. I will check though. Thanks Nic Link to comment Share on other sites More sharing options...
nic_f Posted April 19, 2004 Author Share Posted April 19, 2004 Originally posted by Matt Harwood Does it sound a bit like a pea whistle? Yes it does a little bit. why what is it Matt. BTW I popped in to see you on Friday, but you were out and about. I need to talk speakers with you at some point. CHeers Nic Link to comment Share on other sites More sharing options...
Supraguy Posted April 19, 2004 Share Posted April 19, 2004 The whistle type induction sound on BPU, I can only describe as sounding like an electric drill. Atleast for mine. Dunno of any other whistle type sound though! Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 19, 2004 Share Posted April 19, 2004 Air leak from loose or split hose or leaking gasket, letting boost pressure escape seems a likely candidate. Finding it can be tricky. Link to comment Share on other sites More sharing options...
nic_f Posted April 19, 2004 Author Share Posted April 19, 2004 Originally posted by Supraguy The whistle type induction sound on BPU, I can only describe as sounding like an electric drill. Atleast for mine. Dunno of any other whistle type sound though! Yep I have that sound, that's a nice background sound. this one is far more in your face.... Thanks for your help though... Link to comment Share on other sites More sharing options...
nic_f Posted April 19, 2004 Author Share Posted April 19, 2004 Originally posted by Chris Wilson Air leak from loose or split hose or leaking gasket, letting boost pressure escape seems a likely candidate. Finding it can be tricky. Chris, you might have something there, the sound, sounds like it's coming from the middle of under the bonnet, the near side. Thanks a lot. Nic Link to comment Share on other sites More sharing options...
Paul -C- Posted April 19, 2004 Share Posted April 19, 2004 Maybe the air intake hose is loose/split. The clip on mine came off the other day and I thought I had fcuked up my turbos. When I pressed the pedal down it was a loud whistling noise and I had hardly any power. Link to comment Share on other sites More sharing options...
dude Posted April 20, 2004 Share Posted April 20, 2004 Is it still hitting your normal boost levels ???? Dude:flame Dev Link to comment Share on other sites More sharing options...
nic_f Posted April 20, 2004 Author Share Posted April 20, 2004 Originally posted by dude Is it still hitting your normal boost levels ???? Dude:flame Dev Yes it seems to be, it still pulls from 90 to 120 like you were just pulling away from the light in a normal car. It's just so damn loud. Any ideas? Link to comment Share on other sites More sharing options...
Matt Harwood Posted April 20, 2004 Share Posted April 20, 2004 Unfortuantly, I can't shed any light on the problem, but tend to agree that it's air escaping from somewhere. I have that problem/sound on my car, and I've heard it on another too. Sorry about Friday, I was with a customer trying to get a £75,000 Cadillac through an SVA, until it's power steering exploded! Call me, to make sure I'm in, but feel free to pop down anytime. Link to comment Share on other sites More sharing options...
nic_f Posted April 20, 2004 Author Share Posted April 20, 2004 Originally posted by Matt Harwood Unfortuantly, I can't shed any light on the problem, but tend to agree that it's air escaping from somewhere. I have that problem/sound on my car, and I've heard it on another too. Sorry about Friday, I was with a customer trying to get a £75,000 Cadillac through an SVA, until it's power steering exploded! Call me, to make sure I'm in, but feel free to pop down anytime. Hey no worries about Friday, It' always nice to take a run down the M20, well once you're past the M25 anyway. I'll give you a shout before I leave next time. Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 20, 2004 Share Posted April 20, 2004 Free tip of the week: If you have a suspected air leak and access to a rolling road do this. Remove the fan, refit nuts though to hold water pump pulley on. Spray all pipes showing boost with Fairy Liquid or similar. Run quickly up to max boost, no fans on the engine from external sources either, to stop bubbles blowing about. be quick, temps will rise fast. Trace source of bubbles and fix. Can sometimes be done on the road, but airstream blows bubbles about. On the rollers you can also listen for noise of air escaping with a length of hose. Don't stick it in the fan or moving belts, it can hurt, take your eye out or even bugger something mechanical... : Link to comment Share on other sites More sharing options...
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