forcedinductiongt Posted October 9, 2013 Share Posted October 9, 2013 I just went stage two, and I noticed a tiny flutter noise when building boost to about 5 psi, then it flattens out and sounds completely normal. Still holds boost great throughout the entire range, though. Should I be worried about this? Could it be an exhaust leak of some sort? I'm just seeing if anyone else has had the same issue Link to comment Share on other sites More sharing options...
Wonder_Boy Posted October 9, 2013 Share Posted October 9, 2013 To be safe, you may want to post a video so we know exactly what you're talking about, but it could just be some wastegate flutter as its opening. What kind of mods do you have? Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 9, 2013 Author Share Posted October 9, 2013 Just an AP v3, 2007 STI uppipe, and catless invidia dp Link to comment Share on other sites More sharing options...
FJuan Posted October 9, 2013 Share Posted October 9, 2013 Also, you may want to pull the DP off and check the shaft play on the turbo. Just to make sure the turbo is not starting to go out. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
scoobydoobie Posted October 9, 2013 Share Posted October 9, 2013 Does it sound like this? [ame=http://www.youtube.com/watch?v=6nAW7fABKgk]Odd noise = boost leak? - YouTube[/ame] Link to comment Share on other sites More sharing options...
sodium303 Posted October 9, 2013 Share Posted October 9, 2013 Did you get a divorced Downpipe? I've heard people have problems with the Waste gate flap hitting the bar where they separate the exhaust gasses. Not sure if its true or not. Link to comment Share on other sites More sharing options...
rob-2 Posted October 9, 2013 Share Posted October 9, 2013 Did you get a divorced Downpipe? I've heard people have problems with the Waste gate flap hitting the bar where they separate the exhaust gasses. Not sure if its true or not. We cut it back on my car. Link to comment Share on other sites More sharing options...
iNVAR Posted October 9, 2013 Share Posted October 9, 2013 Your other thread: http://legacygt.com/forums/showthread.php/stage-2-questions-215142.html?t=215142 Pull a log already. I explained the reasons why to you. If you think the jump from stock to stage 1 was a greater jump than from stage 1 to 2, that doesn't seem right. Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 Your other thread: http://legacygt.com/forums/showthread.php/stage-2-questions-215142.html?t=215142 Pull a log already. I explained the reasons why to you. If you think the jump from stock to stage 1 was a greater jump than from stage 1 to 2, that doesn't seem right. And do what with the log? Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 And yes, it's divorced Link to comment Share on other sites More sharing options...
PtPixel Posted October 10, 2013 Share Posted October 10, 2013 Post it here, then everyone can see your parameters and how the car is behaving rather than guessing noises. Take a Learning View screenshot while you're at it Link to comment Share on other sites More sharing options...
PtPixel Posted October 10, 2013 Share Posted October 10, 2013 woah, cannot decipher that. You can attach the .csv to your post, like you would a photo. Go into advance reply, then manage attachments Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 haha sorry about thatdatalog5.csv Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 [ame= ] [/ame] and there's the flutter I was talking about...not full throttle because you can't really hear it then Link to comment Share on other sites More sharing options...
PtPixel Posted October 10, 2013 Share Posted October 10, 2013 For next time try logging: - The air fuel sensor instead of the air fuel learning, sensor actually tells you the AFR ratio. - Ignition total timing Your boost error looks to be oscillating a heap during WOT. Not too many changes in the WGDC but boost error is jumping between-0.5 and 2.5 psi a few times in the space of 5 seconds. Sure you're holding steady boost? (ITT is your ignition timing and AFR sensor is your AFR learning) Link to comment Share on other sites More sharing options...
blongo804 Posted October 10, 2013 Share Posted October 10, 2013 Does it sound like this? Not to thread hijack, but what is this noise? Boost leak? I had it with my stock, healthy turbo when I had a crappy Perrin intake. Link to comment Share on other sites More sharing options...
scoobydoobie Posted October 10, 2013 Share Posted October 10, 2013 Not to thread hijack, but what is this noise? Boost leak? I had it with my stock, healthy turbo when I had a crappy Perrin intake. Surge, tuned it mostly all the way out with an adjustable BPV. Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 Definitely will log that next time...what do you think of the clip? Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 Surge, tuned it mostly all the way out with an adjustable BPV. Did it sound like the clip I posted? How exactly did you tune it out? Link to comment Share on other sites More sharing options...
PtPixel Posted October 10, 2013 Share Posted October 10, 2013 Hard to tell, I have crap headphones, can you point out exactly where in that clip the flutter is? rpm wise Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 From start to about 2800 where I step on it Link to comment Share on other sites More sharing options...
scoobydoobie Posted October 10, 2013 Share Posted October 10, 2013 Did it sound like the clip I posted? How exactly did you tune it out? Honestly I couldn't hear your clip very well. My clip is posted above, you could give it a listen and see if it sounds similar. The Cobb XLE BPV I ran with my FMIC had an adjustable spring, I loosened it almost all the way out to tune out my flutter. Did not get rid of it fully, but for the most part it took care of it. Now I have a PW TMIC and a Forge BPV (Cobb wouldn't fit). Have flutter/surge at certain RPMs/throttle positions. I've just learned to live with it at this point. Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 So is this whole flutter thing just annoying? Or is it the demise of my turbo? Link to comment Share on other sites More sharing options...
iNVAR Posted October 10, 2013 Share Posted October 10, 2013 Hey, I see your log, but I have a few questions: 1) What gear did you do this in? 2) Start your pull in 3rd gear 2KRPM, and pull to redline. Stay in 3rd. 3) Get rid of Dynamic Advance (degrees), MAF Volt. It should help with the logging resolution a teeny tiny bit. You can probably also get rid of FBKC and FLKC right now and instead use Knock Sum only. The AP has crappy logging resolution so when you log, you really have to select parameters based on what you're trying to get out of the log. Also, I tried listening and I really couldn't hear a thing... Link to comment Share on other sites More sharing options...
PtPixel Posted October 10, 2013 Share Posted October 10, 2013 Are you able to take a learning view screenshot? Your AF learnings are +10% (adding 10% more fuel) at low loads which indicates that the engine is seeing more air than the MAF is reading. Firstly try cleaning your MAF, then check the pre-turbo intake for vacuum leaks where air could be sucked into the intake between MAF and compressor. If that's happening then that could explain the flutter. Your log shows you losing boost twice at WOT within 5 seconds so you're losing pressure somewhere but not consistently as it builds boost a little. No AF learnings at high load though... Link to comment Share on other sites More sharing options...
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