Wierd turbo sound....

[WFO731]

Well i just put an Evo3 16g on my car, got dsmlink in, all my fuel stuff finished and i start it up and idles fine. Takes off just normal everything sounds good and once i go under boost it sounds like i have a supercharger under the hood, just a really loud squeal. When i am under boost and go to shift there is no blow off, it just barely flutters down, also it will only build about 8-10 lbs.... all help would be greatly appreciated.

 

[fisherob]

It's a leak in the induction system. The turbo pressurizes everything between the compressor and the intake valves. If there's a leak anywhere in there, the boost pressure leaks out. This is a problem because the engine computer "counts" air molecules before the air gets to the turbo, so any of this measured air (that the computer thinks is going into the combustion chambers) that leaks out doesn't actually make it to the engine. The computer computes how much fuel is needed by looking at that air measurement. If less air is getting to the engine than what it measured, it injects too much fuel. You run rich. Rich robs power and fuel economy. Going slower and paying more at the pump is not as fun. There is A LOT more about this if you'd use the handy search feature.

The search button is my friend

 

[420a-t]

I took off my mbc hookup on my j-pipe and tapped it off my BOV line, is it ok if everything works fine? My BOV opens good, I have not seen any boost creep.

looks like I might be movin' some vacuum lines around...


By the way WFO731, are you going to make it to Firebird on the 7th?

 

[Eclipse98_RS]

I had a big boost leak in my 98 GS-T. When I first got the car it only boosted to about 7PSI. I didnt even hear the BOV barely. Got all the leaks fixed and it was loud. What kind of BOV do you have?

 

[WFO731]

Well most people were right on here, GIANT boost leak at the j pipe, flange was a little uneven and gasket was ripped, got it fixed and on the way to get something to eat and some guy merged on me a pinched me into a guard rail, just my luck both sides of my car are totally screwed.... maybe bad karma?

 

[WFO731]

I took off my mbc hookup on my j-pipe and tapped it off my BOV line, is it ok if everything works fine? My BOV opens good, I have not seen any boost creep.

looks like I might be movin' some vacuum lines around...


By the way WFO731, are you going to make it to Firebird on the 7th?

I was going to until this wreck happened that i just got into...

 

[kenamond]

I was going to until this wreck happened that i just got into...

Sorry to hear that. His fault?

 

[WFO731]

Sorry to hear that. His fault?

Yes he got cited for the accident. And thanks to everyone for there help on fixing my car!!!

 

[kenamond]

Yes he got cited for the accident. And thanks to everyone for there help on fixing my car!!!

Hope the insurance company doesn't try to total it. If they don't, NEW PAINT BABY!!

 

[WFO731]

Hope the insurance company doesn't try to total it. If they don't, NEW PAINT BABY!!

It may get totalled but if it does i might just buy it back and fix it, and yes new paint FTW!!

 

[xioca]

Post up some pictures if you happen to have any.

 

[hybridb18]

i had a similar problem with a customers t3t4, it would barely boost 1-2psi, after going through the car many times trying to figure out the problem, i finally realized the ahaft connecting the compressor and turbine was slightly bent... this caused it to make a bad vibration when the turbo started to spool up.. hope this helps