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  1. #1
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    ATR help: low throttle/ rpm wastegate rattle.

    Since AP's are getting very cheap I decided to give one a try over my jb4. With the jb4 I had no wastegate rattle. With the cobb I get awful rattle low revs and low throttle input. Was going to try to see if I can mask it some. Not sure exactly where to start I read over the atr pdf but any help would be great.

  2. #2
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    So you are saying you have a lot of waste gate rattle at low RPM's with low throttle input?
    2011 E90 M3 \ Melbourne Rot Metallic

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    Sounds like you may want to scale back your WGDC spool table by small increments, until it starts to reduce. Start with a 5% down scale.

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    Yeah it is pretty much starting from a stop it starts when I start letting the clutch out to about 2k-2500. I also have MAJOR throttle closures but that is another issue all together. The OTS maps do not like my car to say the least. E90 I will try the WGDC spool table thanks!

  5. #5
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    Click here to enlarge Originally Posted by blaster3500 Click here to enlarge
    Yeah it is pretty much starting from a stop it starts when I start letting the clutch out to about 2k-2500. I also have MAJOR throttle closures but that is another issue all together. The OTS maps do not like my car to say the least. E90 I will try the WGDC spool table thanks!
    New or old turbos? Did you take out the jb4?
    2011 E90 M3 \ Melbourne Rot Metallic

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  6. #6
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    We've successfully managed to considerably if not completely rid many N54s of rattle with Cobb. Some cases are worse than others out there but in all cases the before/after is very noticeable.
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  7. #7
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    Click here to enlarge Originally Posted by dzenno@PTF Click here to enlarge
    We've successfully managed to considerably if not completely rid many N54s of rattle with Cobb. Some cases are worse than others out there but in all cases the before/after is very noticeable.
    I am probably going to go with you. I was thinking about going with bren because it is near half the price when getting 2 maps. They are older turbos and the jb4 is completely removed. Here is a short log showing how bad the throttle closures are. I really want to go flash only since I am 6mt and no meth. My issue is that I don't want to dump a money into a protune and have rattles.

    http://www.datazap.me/u/blaster3500/cobb-stage2?1-4-20

  8. #8
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    for WG rattle, here is one of BMW's software fixes.
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