I have noooo idea what this could be, but my friend and I just finished installing my SSautochrome TMIC a few hours ago, took it out for a ride, and had a little difference from the stock one; a real nice high pitched beeping/whining/whistling sound. It almost sounds like a leak where rubber would have some high flowing air pushed through a small area around it or something. Kindof if you know how to whistle with an acorn cap.

There's a member on here with a 520whp STi, beavis. I took him for a ride tonight and he thought maybe there was a leak somewhere with the BOV. An incorrect bolt (too short) was used when we reinstalled the tmic and caused the bolt to not be able to tighten, leaking a little boost as well. I came home and fixed that problem, better boost...same noise.

It ALMOST sounds like it could be a warning beep or something, maybe if the new IC allows for more/too much boost as it is untuned, but I've never heard of such a thing on these cars. I'm at the point where everything now is just stupid what if's and grabbing at straws because I can't figure it out.

Thanks!

hows the boost holding?

i had the same problem with my buddies, we left the stock BOV a little loose. maybe take it off, re-align the gasket, and try again?

i had the same problem with my buddies, we left the stock BOV a little loose. maybe take it off, re-align the gasket, and try again?

Tried that, nothing we do really seems to help. :(

Boost is alright, it was only around 16-17psi when the original problem started (tuned for 19), but now it will climb to 18 quickly and hits 19 mostly when it is supposed to.

I'm wondering if it's because the car isn't tuned for it. Hopefully I'll get that done real soon with a few other things and it'll get everything settled.

did you adjust the bottom of the intercooler? like where the inlet meets the I/C? anything you can maybe double check?

I highly doubt the problem is that the car is not tuned for the TMIC.
Check your turbo->Y-pipe hose. That's a likely candidate for leaks, especially at the turbo outlet.

I had that noise too. Even though all of the silicone couplers were tight, we managed to wrench out another turn or two on one of them and the noise went away. Check all the silicone connections.

You need to pressure check it at 20psi and check for leaks...

i had the same noise when i installed my gp moto intercooler and it was coming from the bov--the clasp on the hose was up tight against the intercooler and wasn't allowing it to seal completely--if that is your problem just take some gasket sealant and put on the bov gasket and let it cure for at least 12 hours/overnight and the problem will go away

I had that noise too. Even though all of the silicone couplers were tight, we managed to wrench out another turn or two on one of them and the noise went away. Check all the silicone connections.

So you're saying that you just pretty much retightened everything and it fixed the problem?



"i had the same noise when i installed my gp moto intercooler and it was coming from the bov--the clasp on the hose was up tight against the intercooler and wasn't allowing it to seal completely--if that is your problem just take some gasket sealant and put on the bov gasket and let it cure for at least 12 hours/overnight and the problem will go away"

The vaccuum hose that pushes onto the nipple on the bov? Mine is on real tight, almost to the point where you can't really pull it off without some serious effort.

The gasket for the BOV looks fine but maybe it needs to be replaced. I've had my bov blow right off the intercooler before, and also be loose because of incorrect bolts installed by subaru, but I have never had any sound like this before.

Thanks for the input guys, I'm going to go outside soon and try everything mentioned here. Any more ideas are certainly welcome too!

Anyone want to buy a modded STi? :o

Anyone want to buy a modded STi? :o

hey i'll trade you my swapped bugeye ;)

let us know what happens with the repairs! if anything, go to the stealership and buy new bolts

hey i'll trade you my swapped bugeye ;)

let us know what happens with the repairs! if anything, go to the stealership and buy new bolts

Haha PM me some details on the wrx, I'm almost tempted. :furious:

The problem is that the bolts are fine, I found a set that fit perfectly and tighten snugly. There's no play anywhere and unless a good looking gasket can still be inefficient I'm out of ideas as far as the bov goes.

Unless it's just making so much boost the bov is opening and making that noise? Again though, just grabbing at straws because I've never heard of anything like that before.

PM'd you ;) let me know. get a good pic of the throttle body cuplink meeting the top mount, it might be your problem there. also with the new top mount, did you re-align the intercooler bracket? the driver side has 2 bolts bolted by the intake manifold, loosen them while you fit the new top mount

Thanks for the PM anthony, I'm just inside for a few now from trying to fix it, the IC is off and I'm going to try to use the stock inlet pipe instead of teh one I got with the IC. We had to cut the TB-IC hose a bit, just about 1/4" off of it so the huge IC would slide into place. It still looks plenty long enough to keep both ends sealed inside though.

Reading this thread:

http://forums.nasioc.com/forums/showthread.php?t=944139&page=1&pp=25&highlight=tmic+noise

There have been opinions that the turbo is overspooling in order to make the same boost it made before, and that makes a whistling noise. Could this be because of the drastically lower pressure drop in this IC compared to stock? The stock TMIC has 3psi pressure drop whereas this one only has around .2 pouds pressure drop.

Just another thought, thanks for anymore input!

-James

Alright well I just took the car totally apart and put it all back together again. EVERYTHING that could possibly be loose is tight, and everything is on correctly. The ONLY things not 100% are that the pipes running in front of the intercooler do not fit on correctly because of my bov, even though I've seen other IC's with the same bov have the pipes fit just fine (figures!), and the gaskets for the bov and the pipes on the bottom of the IC are also off of the stock IC. Again, they look FINE and came off the stocker fine and back on here. Those are the ONLY variables that wouldn't be built into the intercooler.

Again, the only other thing I can think of is if the new airflow is allowing the turbo to spool much more and that is where the noise is coming from.

After putting everything back together again, the car SEEMS to hold boost better than before. I monitor it with my accessport so I can't be 100% sure. I'm hoping to get it tuned again within the next week or so so maybe some fresh eyes on the problem can fix it.

Thanks again!

-James

There have been opinions that the turbo is overspooling in order to make the same boost it made before, and that makes a whistling noise. Could this be because of the drastically lower pressure drop in this IC compared to stock? The stock TMIC has 3psi pressure drop whereas this one only has around .2 pouds pressure drop.That's exactly what the turbo is doing if you have a boost leak. If you didn't have a leak, and the pressure drop was that much less, your turbo would be doing less work.

That's exactly what the turbo is doing if you have a boost leak. If you didn't have a leak, and the pressure drop was that much less, your turbo would be doing less work.

Yeah that makes sense...

I'm talking to my tuner right now and he said that the surface where the bov sits is not perfectly flush and has to be grinded down. I've seen mention of this in other threads about the tmic, never really thought about it though. Apparently since the bov doesn't sit flush it obviously creates a space and leaks...hmmmmmmm, I wonder if that's it.

check the connection at the bov

Fixed it!

It's exactly what my tuner said, I used some stuff I have over here to create a good seal on some wavy metal. Everything's tight now, no more noises.

Thanks everyone for the help!

Fixed it!

It's exactly what my tuner said, I used some stuff I have over here to create a good seal on some wavy metal. Everything's tight now, no more noises.

Thanks everyone for the help!


boy good thing your tuner said what i said about 10 post earlier :devil:

with my problem the stock clamp on the bov that returns the bypass air to the inlet tubing --the clamp was too thick causing a small gap -- so i replaced the clamp and used gasket sealant like i said before

glad to see you got it sorted out

happy motoring

Nytmare, just curious, what shop's dyno did you hit 302/310?

(just trying to put it into perspective as I know about how high/low the dynos around you read)

boy good thing your tuner said what i said about 10 post earlier :devil:

with my problem the stock clamp on the bov that returns the bypass air to the inlet tubing --the clamp was too thick causing a small gap -- so i replaced the clamp and used gasket sealant like i said before

glad to see you got it sorted out

happy motoring


Haha sorry man, I guess he dumbed it down for me a little bit so I could understand better. :lol:

Dave, that was on TDC's land and sea dyno. New numbers soon anyways. :banana:

Oh also that was without the TMIC, which you probably knew already.

Not to get too off topic... but this is what you get SS Autochrome's crappy products...

My friends SS autochrome headers for his car leaked from the second day he had them on. I told him not to buy them. After he was unable to get them replaced by SS, I actually broke the welds by hand, by grabbing the tubes and flange and pulling hard... they cracked under minimal pressure.

Their products are poor copies. glad you didn't run into any problems...

You probably won't have any actual power gains till you get retuned. Also, watch out for overboosting. After I installed my Perrin TMIC on my tune, I was able to hit 20psi vs 18 before the TMIC. The car flew, but still wasn't good.

Haha sorry man, I guess he dumbed it down for me a little bit so I could understand better. :lol:

Dave, that was on TDC's land and sea dyno. New numbers soon anyways. :banana:

Oh also that was without the TMIC, which you probably knew already.


same dyno as my "high" reading graph lolol :lol: