Wastegate issues...i think

[Spy_91]

I have gone over the intake hoses so many times and everything is tight and secure. Any thoughts where i could look that isn't obvious?

Its not a whoosh.....its definitely a woooot sound. I used to have the flutter sound like ch ch ch ch sssshhh, but not anymore.

[pandrade]

from a bosch bov upgrade i read about on the faq's they where saying u would hear that whoo noise occasonaly but i have never done this mod( still on my factory bov at 135k miles, surprisingly it works perfectly)

[cre]

Originally Posted by Spy_91

I've read other threads that say the wooting noise is common with improperly adjusted BOV/BPV.

Where? This isn't accurate... at least not for the situation I think you're describing.

Originally Posted by Spy_91

Its not a whoosh.....its definitely a woooot sound. I used to have the flutter sound like ch ch ch ch sssshhh, but not anymore.

Ok, flutter = b a d. I'd need more specifics to really give any opinion on the "woot" you're hearing. The discharge sound will vary depending upon the configuration of the vehicle's intake. The Bosch sounds much like the stock BPV but as you didn't have a good one to start with it's a moot point. If you have a large, open element air filter you'll have a louder "woosh" kind of sound. Check your vacuum tubing to be sure there aren't leaks which may be causing the BPV to open slow or just partially.

There should be no sound WHILE you are boosting. If there is the most common causes (as well as causes of the code 34) are: #1 boost leak, #2 bad AFM, #3 shot wastegate and #4 bad turbo.

An improperly setup EBC shouldn't really affect the vehicle as you are describing but anything's possible. A wiring problem would be more likely. Personally, I'd remove the unit until everything else is fixed.

[Spy_91]

Where? This isn't accurate... at least not for the situation I think you're describing.

So woooting sound during boost = not good. I dont remember where i read that, but it wasn't on this forum. I just googled "bypass valve wooting sound" Just goes to show you can't trust everything you read on the internet

Ok, flutter = b a d. I'd need more specifics to really give any opinion on the "woot" you're hearing. The discharge sound will vary depending upon the configuration of the vehicle's intake. The Bosch sounds much like the stock BPV but as you didn't have a good one to start with it's a moot point. If you have a large, open element air filter you'll have a louder "woosh" kind of sound.

The woot/hoot sound happens at WOT around 4-6 psi. It doesn't woot when i let off the throttle to shift, that makes the whoosh sound you talked about. And btw i have the hks mushroom head air fliter

There should be no sound WHILE you are boosting

Except for the hissing of the turbo

bad AFM

I replaced the AFM like 3 years ago, really hope its not busted already. The car runs fine (with the recent Bosch BPV mod) and idles prefectly at like 600-700 its only when you punch it that it has issues boosting. When the AFM went bad the first time i couldn't drive it at all....it would just stall and get bogged down.

Personally, I'd remove the unit until everything else is fixed.

Yeah....I hooked it back up after i got the BPV on there and then after the car started shutting down while boosting and having the code 34 so I disconnected it again.

I really appreciate all the posts. Sounds more and more like I have an elusive boost leak somewhere. I'll recheck all the lines and the WG actuator and keep ya posted. Thanks again!

[cre]

Originally Posted by cre

There should be no sound WHILE you are boosting. If there is the most common causes (as well as causes of the code 34) are: #1 boost leak, #2 bad AFM, #3 shot wastegate and #4 bad turbo.

Sounds most like a boost leak to me... a small one, hence the whistle/groan/woot sound.

I wouldn't run that filter. Gets plenty of poor reviews, a couple show-downs have shown it to perform very poorly and I've seen enough of them collapsed with bits (of just the foam) sucked into the turbo for me to go nowhere near it. But, if you like it that's fine.

[Spy_91]

Great....a small one is going to be hard to find.

That's the filter that was on the car when I bought it. I had never heard anything bad about it, so i always used it. But that makes sense that the "sponge" would fall apart and get ingested by the turbo. Might be time for a change, especially if its gonna save my turbo and add a few horses. I'm thinking just a cone w/ paper filter.... seems to be popular. Anyone know of a good one? Might be time to start a new thread

[cre]

Google "diy boost leak tester".

Google "air filter show down".

Searc h on the forum for cold air intake threads or CAI or best filter... and so on. The two most popular options (and the two which typically come out on top in tests) are AEM DryFlow and Apex'i. Amsoil's air filter's are supposed to rank right up there with those other two but they as well as the Apex'i command a premium over AEM. I like the AEM for price and performance.

Whatever you get don't just leave it sucking in hot air from the engine bay, you're better off just keeping the stock box and putting in a GOOD air filter.

[Green7mgte]

4/6 psi at wot.. not on deceleration? does compression surge only happen when the throttle place closes?

[Spy_91]

Apologies for bringing back an old thread. But I resolved the problem and if anyone else has the problems listed above, hopefully this helps.

As i posted previously, my boost was cutting out at wot and I got error code 34. I replaced my stock BOV, with the Bosch and after checking every intake hose and cupler, I found no holes, cracks, or loose fittings. Since that did not fix my problem. So I went to the next suggestion, which was the wastegate actuator. After inspecting the actuator (opening up the canister) I found a small hole/crack in the rubber diaphragm. I bought a new "CT26 Wastegate Actuator" from driftmotion (which was a direct fit) and installed it. Went with the 11 psi since it was the same price as the 8 psi. Anyway....Problem solved!! No longer cuts out at wot and is able to boost to well over 5 psi (which is were it usually cut out) no more error codes, and woot/hoot sound went away.

cre - thanks for all your input. You'll be happy to know that i ditched that sponge filter and i'm currently running apexi's cone intake filter.