WizardBlack Posted May 19, 2009 Share Posted May 19, 2009 It could be a rubber/silicone fitting with a leak or crack in it that is pushed open by boost. Those kinds of leaks can make some wicked noises. How about a pressure test of the intake tract? Quote Link to comment Share on other sites More sharing options...
delorean6584 Posted May 19, 2009 Author Share Posted May 19, 2009 i wil double check for stuff on the intake, but all hoses are new, how do you do a intake leak test ? if i put pressurized air in the intake it will leak through the cylinders ? Quote Link to comment Share on other sites More sharing options...
softopz Posted May 20, 2009 Share Posted May 20, 2009 hey delorean, I recently rebuilt my motor l28et and I got it running good enough than that sound came around. Iam not sure if the same as yours. I narrowed mine done to the chain tensioner rubbing the chain and its a squel almost like a belt squeel. I am re opening the front cover and going to correct it. Just a thought though , Iam not there so I cant say. Is it making the sound when you rev? on load? is it coming from the side front or rear? good luck pointing it out Quote Link to comment Share on other sites More sharing options...
delorean6584 Posted May 20, 2009 Author Share Posted May 20, 2009 the sound is like a howling, but only on hi loads never done that under 7psi of boost so i need to drive it hard to hear the sound, it sounds like coming from the left of the engine though.... Quote Link to comment Share on other sites More sharing options...
Careless Posted May 22, 2009 Share Posted May 22, 2009 i'm saying actuator on this one. I think its opening the waste-gate whereas before it was cleaned it was probably stuck shut. the howl is usually a common sound with turbos. Quote Link to comment Share on other sites More sharing options...
delorean6584 Posted May 23, 2009 Author Share Posted May 23, 2009 my turbo is a rebuilt so the wastegate is not stuck, it is working perfectl, but i remeber seing a crack on the housing where the wastegate is...i asked for it on hybridz for that i had replies that it dont matter, the boost ir very good, but maybe could the crack making the sound ?? its not leaking anywhere though... i also tested the actuator with 40psi of ciompresed air, no leaks no sound, wastegate closed.. Quote Link to comment Share on other sites More sharing options...
Careless Posted May 24, 2009 Share Posted May 24, 2009 you misunderstood what i read. I'm saying now that it's rebuilt and the actuator rod is clean and the housing is refreshed... i think it's opening PROPERLY now, and that the sound you hear is just something you didn't hear before. the crack you posted is the same as the crack i have on my waste-gate flapper area and it's negligible. Quote Link to comment Share on other sites More sharing options...
delorean6584 Posted May 25, 2009 Author Share Posted May 25, 2009 ok i understand, i didnt hear that sound before because that engine wasnt mine, i bought the engine without the turbo and exhaust manifold, after installing all these components i used it in my spare car, wich didnt had any exhaust, the stock ecu wich wasnt working more than 50% of the time, so i didnt used it at all, now with all the new ecu, intercooler i hear it very loud...the gaskets for intake and exhaust are new, i dont see any leaks at all, the turbo is rebuilt, nothing is stuck...but it seems really like something coming from the wastegate, just like it opens too soon or the pressur push it just enough to allow some air to bypass and wistle... Quote Link to comment Share on other sites More sharing options...
delorean6584 Posted May 27, 2009 Author Share Posted May 27, 2009 update !!, i didnt find what was the sound yet but i talked to one of my friend wich did had some problems on his car when raising the boost like i did, he had to install a external wastegate because the boost was higher than the spring in the wastegate actuator, thus opening the bypass valve, mine doesnt seem to loose boost though...atleast until 4500 (the dizzy cuts at 4500), so could it be possible that the bypass valve is beginning to open wich could create the whistling sound ? Quote Link to comment Share on other sites More sharing options...
WizardBlack Posted May 28, 2009 Share Posted May 28, 2009 update !!, i didnt find what was the sound yet but i talked to one of my friend wich did had some problems on his car when raising the boost like i did, he had to install a external wastegate because the boost was higher than the spring in the wastegate actuator, thus opening the bypass valve, mine doesnt seem to loose boost though...atleast until 4500 (the dizzy cuts at 4500), so could it be possible that the bypass valve is beginning to open wich could create the whistling sound ? Depends on how it sounds, but my turbo sounds like a jet engine when it's spooling. Some make funky whistles and some just the whooshing/sucking sounds. Quote Link to comment Share on other sites More sharing options...
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