alright, at lower boost when i blow off, the turbo does this flutter thing...almost like its reverberating....at higher boost it doesn't do it....i checked all the vac lines and such, no problems there...anyone have any ideas?
#49482, "RE: interesting noise when blowing off" In response to Reply # 0
What kind of bov are you using? If its fluttering that is bad. If needs to possibly be set softer I believe.
1998 Eclipse GS,Hahn Stage 2 Turbo Kit w/ Missing Link and Vortech SFMU,TurboXS Type H RFL, Turbo XS HP Boost Controller, Corbins Digital A/F Gauge,Apex N1 Exhaust,Autometer Gauges
#49488, "RE: interesting noise when blowing off" In response to Reply # 2
if u got that HKS SSQV well tuff, i had that piece of $hit and got rid of it. the HKS is only good for anyone goin 10psi or more. that thing under boost kept makin that flutter sound, and my car was jerkin when it did that. replaced it with the greddy type s.
#49495, "RE: interesting noise when blowing off" In response to Reply # 4
turbo xs rfl is good for at least 10psi. If you want to take care of most of that fluttering. T the boost controller off the vacuum line from the intake mani to the bov.
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#49511, "RE: interesting noise when blowing off" In response to Reply # 6
^^ yeah, that fluttering sound is compressor surge because the BOV is too tight to open under low boost. If your BOV is as loose as it can go and you are still getting fluttering, you might have to take the spring out and cut it down a little. I had to do that with my Blitz Supersound BOV.
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#49537, "RE: interesting noise when blowing off" In response to Reply # 8
What spacer? cause i have a hks and the fluttering is starting to bother me
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#49548, "RE: interesting noise when blowing off" In response to Reply # 9
i've heard of that trick too. for some strange reason, putting the air filter directly on the turbo instead of having that extender tube in there seems to reduce bypass valve flutter.
#49566, "RE: interesting noise when blowing off" In response to Reply # 10
Ok guys he said he has the TurboXS H rfl.
That noise is surge. Your not opening at low boost because the spring is putting too much force on it to open at low #'s. Pull the spring and cut about 1/2 coil off at a time. Put it back in and drive around to see if it is opening. Obviously it isn’t going to be as loud as the high boost sounds but it SHOULD NOT FLUTTER.
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