munchstagea Posted May 6, 2006 Share Posted May 6, 2006 Stagea RB25DET stock as a rock. Harsh induction noise at around 5,000RPM sound is similar to a fan belt slipping or loud air leak, have all the belts as tight as you would want them. Sound seems to be coming from turbo area, only at high RPM with a stab of throttle in Neutral. Happens on the road too when kicked down (auto box). Have unplugged the BOV to see if that was where the sound was coming from but no luck, only just coming on to boost but it is definitely down that path somewhere. The car is freshly imported so has come to me with this problem so I can't shed any light on how it may have developed. I am not going to flog it to see what happens, just wondered if any turbo experts out there could throw a suggestion in the ring? My Dad is a mechanic but has very little experience with turbos (I have less!), we are not sure where to look and want to avoid major pull downs for something that may be simple. Any recommendations for a Turbo workshop in the Geelong area would be great too? Would love to have someone that knows their stuff have a look and listen... Cheers Luke Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/ Share on other sites More sharing options...
SoFly Posted May 6, 2006 Share Posted May 6, 2006 would this be like a screaming sound? Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2144825 Share on other sites More sharing options...
munchstagea Posted May 6, 2006 Author Share Posted May 6, 2006 would this be like a screaming sound? I wouldn't say screaming... loud like a belt slip but not "holy crap, what's that?" loud... It doesn't sound right but not catastrophic at the same time... Luke Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2144957 Share on other sites More sharing options...
QRI05E Posted May 6, 2006 Share Posted May 6, 2006 Hmmm... Have a look at the exhaust from underneath the car... Are there any pipes running off the waste gate/turbo that are cut off and vented atmospherically??? If so, you have a screamer pipe that’s the only conclusion i can think of if its an "induction" noise heard at around 5000RPM as that is when the waste gate is fully open... The screamer pipe is a separation of the waste gate housing from the turbo as to vent the boost pressure atmospherically, its meant to help increase top end power however is illegal in Australia... sounds awesome on large turbos... Let us know how you go.. Regards, Sarkis Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2144963 Share on other sites More sharing options...
bloodsword27 Posted May 6, 2006 Share Posted May 6, 2006 screamer aye?! :| ahaha...i wouldnt mind a screamer pipe either hahah finkn of droping 1jgte in2 my dads hiace hahaha Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2144968 Share on other sites More sharing options...
stolen_s15 Posted May 6, 2006 Share Posted May 6, 2006 (edited) Also check your exhaust manifold, dump pipe and front pipe for cracks. I had a similar problem on my s15, once the turbo started really boosting it made a noise similar to what you describe. If your car ever scrapes or bumps over anything (speedbumps, ect) this can certainly happen, even tiny cracks can cause this. Cheers Nick Edited May 6, 2006 by stolen_s15 Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2144969 Share on other sites More sharing options...
munchstagea Posted May 6, 2006 Author Share Posted May 6, 2006 Also check your exhaust manifold, dump pipe and front pipe for cracks. I had a similar problem on my s15, once the turbo started really boosting it made a noise similar to what you describe. If your car ever scrapes or bumps over anything (speedbumps, ect) this can certainly happen, even tiny cracks can cause this.Cheers Nick Will be investigating pipes and possibly manifold and turbo to exhaust gaskets, don't want it to be a turbo bearing!!! I have only driven it 40km and it's not even on the road yet... It's doesn't scrape on anything, pretty stock height but the car is new to me, no existing damage underneath so I think I am pretty safe there. Great advice guys, keep it coming. Luke Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2144991 Share on other sites More sharing options...
munchstagea Posted May 6, 2006 Author Share Posted May 6, 2006 To add to this, another question: In neutral, slowly bring the revs up to 3k, should I see boost? I see vacuum, but do get some boost when bringing revs up quickly with a reasonable, not to aggressive stab of the loud pedal... Luke Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2145122 Share on other sites More sharing options...
ian Posted May 6, 2006 Share Posted May 6, 2006 are you getting any error codes from the consult port (assuming you still have a stock ecu)?? Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2145125 Share on other sites More sharing options...
mad082 Posted May 6, 2006 Share Posted May 6, 2006 you will only get boost in neutral if u really punch it. there is no load to bring the boost on. Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2145128 Share on other sites More sharing options...
munchstagea Posted May 6, 2006 Author Share Posted May 6, 2006 are you getting any error codes from the consult port (assuming you still have a stock ecu)?? Stock ECU, stock everything as far as I know, have not gone down that path yet. you will only get boost in neutral if u really punch it. there is no load to bring the boost on. Really? That's very good to know, so if I "stall it up" I should see boost? Will try that tomorrow. Cheers Luke Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2145139 Share on other sites More sharing options...
mad082 Posted May 6, 2006 Share Posted May 6, 2006 thats one advantage of turbo's over superchargers. in a manual turbo if you miss a gear and rev it out there is little boost, where-as in a supercharger if you miss a gear the engine still cops full boost. thats why holden never made the supercharged v6's in manual. Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2145160 Share on other sites More sharing options...
Tangles Posted May 6, 2006 Share Posted May 6, 2006 Matey - has the sweet-as Stag got a pod filter (no airbox)? They make 'induction' noise, sort of..... damn that sucks that you've got a worry so early in Stagea ownership. it'll come good tho, no doubt about it Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2145175 Share on other sites More sharing options...
munchstagea Posted May 6, 2006 Author Share Posted May 6, 2006 Matey - has the sweet-as Stag got a pod filter (no airbox)? They make 'induction' noise, sort of..... damn that sucks that you've got a worry so early in Stagea ownership. it'll come good tho, no doubt about it All stock air box etc. Yeah I know dramas, will get it sorted, don't have a choice! Luke Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2145295 Share on other sites More sharing options...
ardie Posted May 6, 2006 Share Posted May 6, 2006 check ur gaskets, ong of my friends had a similar problem and it was that one of his gaskets had deteriated over time and when a bit of pressure went you would hear a high pitched squeal/scream Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2145418 Share on other sites More sharing options...
R31Nismoid Posted May 7, 2006 Share Posted May 7, 2006 Hmmm... Have a look at the exhaust from underneath the car... Are there any pipes running off the waste gate/turbo that are cut off and vented atmospherically??? If so, you have a screamer pipe that’s the only conclusion i can think of if its an "induction" noise heard at around 5000RPM as that is when the waste gate is fully open... The screamer pipe is a separation of the waste gate housing from the turbo as to vent the boost pressure atmospherically, its meant to help increase top end power however is illegal in Australia... sounds awesome on large turbos... Let us know how you go..Regards, Sarkis Well considering he says it does it in neutral... and a screamer/wastegate wont open in neutral its fair to say that its got nothing to do with a "screamer" pipe Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2146334 Share on other sites More sharing options...
ICER33 Posted May 7, 2006 Share Posted May 7, 2006 mate the best place for work on turbo's is Dalton's down on wood st. chris is real helpful and he would screw you around. also geelong tuneups which is on wood st to are supposed to be pretty cluey. (i think one of the guys there racers in some porsche league). either way there are both off fyans street. good luck Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2146402 Share on other sites More sharing options...
munchstagea Posted May 7, 2006 Author Share Posted May 7, 2006 mate the best place for work on turbo's is Dalton's down on wood st. chris is real helpful and he would screw you around. also geelong tuneups which is on wood st to are supposed to be pretty cluey. (i think one of the guys there racers in some porsche league).either way there are both off fyans street. good luck ICER33 Thanks for the info, I will look them up, would be nice to have a trained ear have a listen before I get too carried away... Cheers Luke Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2146435 Share on other sites More sharing options...
paulr33 Posted May 7, 2006 Share Posted May 7, 2006 try repeating same thing with the stock airfilter panel removed Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2146443 Share on other sites More sharing options...
munchstagea Posted May 7, 2006 Author Share Posted May 7, 2006 try repeating same thing with the stock airfilter panel removed ...and what should I get then? Link to comment https://www.sau.com.au/forums/topic/116590-harsh-induction-noise-at-around-5000rpm/#findComment-2146478 Share on other sites More sharing options...
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