PtPixel Posted October 10, 2013 Share Posted October 10, 2013 So is this whole flutter thing just annoying? Or is it the demise of my turbo? As far as I can see your turbo is OK, did you check it for play when you put the DP on? If your turbo was causing issues I would expect to see your wastegate trying to keep up with it and WGDC looks to be fine. Turbo looks to build pressure fine, the system loses it somehow. Link to comment Share on other sites More sharing options...
iNVAR 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... He's got an AP, no LV available. He has to do a quick log (like 2 secs worth) of the following parameters: AF Learning A, B, C, and D. Also he's not losing boost. He's shifting up. Link to comment Share on other sites More sharing options...
PtPixel Posted October 10, 2013 Share Posted October 10, 2013 Also, I tried listening and I really couldn't hear a thing... Hard to hear, just as the needle hits and hovers around 2000 rpm there's a slight purr Link to comment Share on other sites More sharing options...
scoobydoobie Posted October 10, 2013 Share Posted October 10, 2013 So is this whole flutter thing just annoying? Or is it the demise of my turbo? IME, just annoying. But I can't say for sure about your car.. I've been having this flutter issue for a couple years, and my turbo still works fine. Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 One sec ...I'll go do another run Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 3rd geardatalog7.csv Link to comment Share on other sites More sharing options...
iNVAR Posted October 10, 2013 Share Posted October 10, 2013 What's the weather like there? Cool right now, right? Was your car sitting for a while immediately prior to this log, or did you drive it around a bit to get air flowing to clear up any heatsoak, and then do the log? Your spool seems awfully slow but admittedly, I don't have much (if any) experience really looking hard at logs for the 5EAT. It's kind of weird how your WGDC drops so low, but maybe that's a 5EAT thing going on... Hmm. Also, do a quick grab (no need to do an actual pull) for AF Learning A, B, C, and D. Just a 2 or 3 second log is fine. Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 you called it. it's about 50 degrees out, and it was sitting for an hour before the run. and by grab do you mean just at idle? Link to comment Share on other sites More sharing options...
iNVAR Posted October 10, 2013 Share Posted October 10, 2013 Yeah, just connect it and log on, log off. And post it up. Those parameters should tell us how your AF trims are. Still no idea what the sound is, but I wanted to make sure things look right on your end. I honestly don't know why your WGDC dips like that though and why your spool kind of sucks. Did you drive around a bit (5 minutes at 25MPH+) to cool off the car? The TMIC was probably heatsoaked if you sat for an hour. Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 the car sat off for an hour, then i drove around for a couple minutes and did the run (i dont know how big of a difference this would make, but i have no heatshield on right now, it's in the mail on the way)datalog9.csv Link to comment Share on other sites More sharing options...
iNVAR Posted October 10, 2013 Share Posted October 10, 2013 No heatshield over the DP can make a good bit of difference. That DP gets really, really, really hot and the heat goes right up to the TMIC. As the other guy pointed out, your AF trims look a bit out of wack. You may have a vacuum leak somewhere. Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 Okay...it also idles high until I give the gas a tap and then it sinks back to normal...but I'll look for a post MAF leak tomorrow Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 By high I mean 1300 Link to comment Share on other sites More sharing options...
iNVAR Posted October 10, 2013 Share Posted October 10, 2013 And that's after it's already warm? 1300 is very high for a warmed up idle. Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 That's when it's cold...but when I was stage one it would only be 1000 cold Link to comment Share on other sites More sharing options...
PtPixel Posted October 10, 2013 Share Posted October 10, 2013 Wouldn't worry about the high idle on a cold start up, mine can sit up at 1500 for a few seconds until I get moving. Yeah having no heat shield or turbo blanket will heatsoak the hell out of your TMIC, would jump on that. Such a long spool up isn't showing the same dips as before. A vacuum leak is likely to be what's causing the flutter and AF learning, some kind of odd leak that seals itself on high levels of vacuum, maybe as simple as a loose hose clamp. Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 The intake tube connecting the the air box right after the MAF was not in place right. I put it in place, tightened it, and the idle instantly went down and ran more smoothly...thanks guys! Link to comment Share on other sites More sharing options...
iNVAR Posted October 10, 2013 Share Posted October 10, 2013 Great! Did that also happen to take care of the noise? Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 Sadly not Link to comment Share on other sites More sharing options...
PtPixel Posted October 10, 2013 Share Posted October 10, 2013 Ah bummer. Good that the leak was found though. Can't see much in that log, maybe try another log without so much heat soak on the TMIC, drive around for 5-10mins before a pull. Also in that log you weren't 100% throttle from 2k-3k rpm. Also see if you can do a 50% throttle pull or so, how ever much throttle is required to cause the flutter, just try to keep the throttle at a steady position Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 Okay, what parameters should I monitor? Sent from my SPH-L720 using Tapatalk now Free Link to comment Share on other sites More sharing options...
PtPixel Posted October 10, 2013 Share Posted October 10, 2013 See if you can get the 4-byte version of engine load and AFR sensor, they're just a bit more accurate when logged as 4-byte. Otherwise what you have there is good Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 4 byte version? I'm doing this off my AP Sent from my SPH-L720 using Tapatalk now Free Link to comment Share on other sites More sharing options...
PtPixel Posted October 10, 2013 Share Posted October 10, 2013 Oh doesn't matter then Link to comment Share on other sites More sharing options...
forcedinductiongt Posted October 10, 2013 Author Share Posted October 10, 2013 Cool, I'll go do a 50% run, 100% run, and idle Sent from my SPH-L720 using Tapatalk now Free Link to comment Share on other sites More sharing options...
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