strange turbo noise

B

BELL

Founding Member

Feb 21, 2002

722

0

0

California

Sep 2, 2006

#1

• Sep 2, 2006

• #1

Look I took the airbox out of the 86 black svo put on a nice and large cone filter. now it sounds really wierd. the spool is so LOUD and makes a very strange noise when i shift under boost. this engine dosnt have a bypass valve. but my 84 svo has a 65mm throttle body and a big valve head all that crap and sounds totally different then this one. i'm stumped. is the noise i'm hearing air turbulance from the filter to VAM, to the turbo. dunno i'm stumped. it almost sounds like i have huge tear in a IC host but i checked, none. to a degree it almost sounds like a bearing noise but before i did this it was fine...

 

65ShelbyClone

Founding Member

Sep 9, 2000

4,675

38

119

Antelope Valley, SoCal

Sep 3, 2006

#2

• Sep 3, 2006

• #2

It's probably just the compressor surge when the throttle shuts between shifts. My stock '84 makes a wierd sound when the butterfly closes in the boost also.

 

B

BELL

Founding Member

Feb 21, 2002

722

0

0

California

Sep 3, 2006

#3

• Sep 3, 2006

• #3

to a degree i wanna say it sounds like compressor surge, it has a squeel to it on spool almost like a bearing noise or a split ic hose. i'm gonna let it cool down a bit before i check. is it possible i could have gone to large of a filter i think its a kn re 0920 its about 8 in long and a 3 1/2in diameter

 

65ShelbyClone

Founding Member

Sep 9, 2000

4,675

38

119

Antelope Valley, SoCal

Sep 3, 2006

#4

• Sep 3, 2006

• #4

It's pretty much impossible to have too large of an air filter.

 

B

BELL

Founding Member

Feb 21, 2002

722

0

0

California

Sep 4, 2006

#5

• Sep 4, 2006

• #5

thats what i was thinking, it goes out of the vam to a 30 degree abs 3in elbow. thats all. if there happend to be an air pocket in the turbo feed line would that be enough to toast the bearings in the turbo?

 

65ShelbyClone

Founding Member

Sep 9, 2000

4,675

38

119

Antelope Valley, SoCal

Sep 4, 2006

#6

• Sep 4, 2006

• #6

I doubt that it would damage anything unless A LOT of air somehow got into the line while in the middle of a 22psi blast. The air would blow through pretty fast once it got to the bearings and even idling the car for 30sec probably would it clear it.

 

B

BELL

Founding Member

Feb 21, 2002

722

0

0

California

Sep 5, 2006

#7

• Sep 5, 2006

• #7

only other thing i can think of is air tubulance from 45degree bend after the air filter and before the VAM

 

T

t3-svo

New Member

Apr 18, 2005

76

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0

Mooresville NC

Sep 11, 2006

#8

• Sep 11, 2006

• #8

i put a k&n filter on my svo and it did the same noise. it spools fast as hell now. the noise hasnt lead to any problems. and if you run a recirculation line back before the turbo the noise will go away. that sound is just a surge. it would be smart to hook up a BOV too. that would stop the noise and would increase turbo life. you can just vent a hose off the intake after the turbo to the atmosphere and it will sound like a BOV! it pretty much does the same thing and turbo lag will dramatically decrease.

 

B

BELL

Founding Member

Feb 21, 2002

722

0

0

California

Sep 12, 2006

#9

• Sep 12, 2006

• #9

thats what I was thinking BPV is the way to go on this ride...