Engine bay has Hissing/Balloon sound under boost after intercooler install!!

[mrharmon10]

hey guys,I did a search and couldn't get an answer. I But a new intercooler and piping put in and now it hisses like a balloon letting out air. i check all the couplers, clamps, changed the BOV, and CHecked the vacuum hoses and couldn't find anything. THe sound is coming from the exhaust side. Please help.

Thanks.

[CMG]

Uhh, do you have a cone intake or something? That sounds like hissing at WOT. Does it seem to affect performance?

[mrharmon10]

my intake is an apexi and it's on a stock rubber intake hose. it will his starting at 6psi and get louder as boost builds. it doesn't appear to effect performace at all, at least not yet.

[schanne]

Thats the sound your supposed to hear. Sounds like my girl sucking in really hard...

[mrharmon10]

haha. It honestly sounds like the sound of air coming out of a balloon with the end pulled tight. i don't kno what to think. i've looked at everything.

[IanS]

Check the tightness of your turbo to manifold bolts, if they are slightly loose, the gasket will buzz under high pressure. Imangine putting a blade of grass between your thumbs, now blow real hard. Ive had this probem more than once.

[CMG]

my intake is an apexi and it's on a stock rubber intake hose. it will his starting at 6psi and get louder as boost builds. it doesn't appear to effect performace at all, at least not yet.

So you're saying the sound is something other than the apexi? Is it only at boost? Have you hand twisted the throttle to see if you can replicate the sound, or is it only under boost?

[mrharmon10]

ok man, thanks so much man. i really appreciate it. aside from that is there any other reasons that it would sound like that??

[mrharmon10]

yep only under boost. and it's only under atleast 6-8psi.

[bgsr240]

Its has to be the manifold gasket or the gasket inbetween the turbo and the manifold then. That is, if your sure that all of the clamps are tight.

[CMG]

very possible, if it were that though I would describe it more like a helicopter sound though.

[IanS]

very possible, if it were that though I would describe it more like a helicopter sound though.

When they are only slightly loose, it does not leak all the time, only under load and higher boost, its more of a screech or a whistle, it happens to me every time I pull my turbo, usually around two weeks after.

[mrharmon10]

i'll double check the tightness off the manifold bolts. So pretty much, it's got to be that something with a gasket is loose, i'll get on it and let you guys know later tonight. i really appreciate it guys. thanks.

[CMG]

When they are only slightly loose, it does not leak all the time, only under load and higher boost, its more of a screech or a whistle, it happens to me every time I pull my turbo, usually around two weeks after.

Around what rpms do you hear the sound? Just curious cuz I'm redoing my mani and exhaust. I've had various sounds that I try to fix. Latest sound was the heli sound due to cracked runner. I also have a sound from somewhere around the tb when I let off the gas, sounds kind of like a vw beetle sound, like a twittering whistle ya know.

[mrharmon10]

it has nothing to do with RPM. the sound only starts when under boost. i can let off at 5000rpm and won't hear it until i build boost. it's totally relies on boost pressure.

[wzntha]

.

[IanS]

Tighten your turbo to manifold bolts. It is a very common problem with the SR, some screech, some do not.

[tucker3113]

I may be way off but is there a chance that you are hearing the turbo spool and that is why it is only under boost and not when letting off throtle? I understand what they are saying about the gasket but for it to have started right after putting a front mount on it seems to be unlikely. I would check for the bad gaskets but I would go over what you did installing the front mount again just to double check? What brand is the front mount that you have. Do you have any boost problems or is it holdint fine?

[mrharmon10]

ok so i pulled the compressor outlet and checked the gasket and it's pretty worn out. just to make sure i put some high temp silicone gasket maker on with the metal gasket and it ran fine, but since it calls for 24hours to set up it didn't hold and after about an hour it started to leak again, i'm just gonna have to get a new gasket. but sure enough, it's the gasket leaking. thanks for the help guys.

[seanman]

hey so this is somewhat related. My sr clip just showed up today (YAY) so im excited, i have a greddy sr20 s13 FMIC sitting on my car, and i was wondering if when i drop in the sr and connect the fmic, will i have to tune the car because of the bigger IC?

[redtop91]

No.

[seanman]

super sick. where should i put my bov? ive heard closer to turbo is better for compressor and closer to tb= better throttle response

[idahotuner]

mine is on my cold pipe. but now thati havea greaddy intake manifold . i think i wll get an hks hot pipe with it over there. i would lie ka deffeniate answer o nthis one too.

lol on cool thing about it on the pasengers side is when you pass some one and it blows the yare like