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  1. #76
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    Nobody? :/
    @dzenno@PTF @Terry@BMS @BoostAddict
    @Sticky if you know anybody else that you can tag. i need a little help with the pic of the log I posted...
    Burger Motorsports
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  2. #77
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    What does your tuner say about it? that thing looks like greek to me haha. prob best with someone that is experienced with that software.

    Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
    Nobody? :/
    @dzenno@PTF @Terry@BMS @BoostAddict
    @Sticky if you know anybody else that you can tag. i need a little help with the pic of the log I posted...
    2011 335is DCT, JB4 + MHD BEF, stage 2 LPFP, e50 + 50/50 meth, FBO, MT ET Streets when needed


  3. #78
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    Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
    Nobody? :/
    @dzenno@PTF @Terry@BMS @BoostAddict
    @Sticky if you know anybody else that you can tag. i need a little help with the pic of the log I posted...
    I'd have to say the same thing, ask the tuner.

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  4. #79
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    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    What does your tuner say about it? that thing looks like greek to me haha. prob best with someone that is experienced with that software.
    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    I'd have to say the same thing, ask the tuner.

    I have asked him, he said compressor surge. He said turbo is flowing too much LOL. How the $#@! is that bad!? I was just asking in physical terms. What would be wrong with the turbo if this is happening during WOT.
    @Sticky, I can't muti quote.
    Burger Motorsports
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  5. #80
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    Update vid, first wot breaking the car in. Base file 14-16 psi in the log... enjoy.

    Burger Motorsports
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  6. #81
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    Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
    I have asked him, he said compressor surge. He said turbo is flowing too much LOL. How the $#@! is that bad!? I was just asking in physical terms. What would be wrong with the turbo if this is happening during WOT.
    @Sticky, I can't muti quote.
    Multiquoting is disabled.

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  7. #82
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Multiquoting is disabled.
    Reasoning?
    Burger Motorsports
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  8. #83
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    Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
    Reasoning?
    Looks cleaner without it. I can re-enable but I prefer to highlight quote.

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  9. #84
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Looks cleaner without it. I can re-enable but I prefer to highlight quote.
    Highlight or clicking is the same thing lol. Multi quote is necessary!
    Burger Motorsports
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  10. #85
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    @VargasTurboTech what are the main causes of compressor surge? Not something I've had to deal with yet.
    @fastgti69 what turbo is it and I thought it had an anti surge compressor housing?
    2011 335is DCT, JB4 + MHD BEF, stage 2 LPFP, e50 + 50/50 meth, FBO, MT ET Streets when needed


  11. #86
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    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    @VargasTurboTech what are the main causes of compressor surge? Not something I've had to deal with yet.
    @fastgti69 what turbo is it and I thought it had an anti surge compressor housing?

    Thanks bro, it's a 25g and yea it has compressor surge housing but its happening during WOT. I even posted my Log and stuff on the evolutionm.net in the evo 9 turbo stuff under the 25g thread. Nobody has got back to me yet..
    Burger Motorsports
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  12. #87
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
    Highlight or clicking is the same thing lol. Multi quote is necessary!
    You can highlight multiple posts so how is it not multi-quote?

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  13. #88
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    Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
    Thanks bro, it's a 25g and yea it has compressor surge housing but its happening during WOT. I even posted my Log and stuff on the evolutionm.net in the evo 9 turbo stuff under the 25g thread. Nobody has got back to me yet..
    Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
    Highlight or clicking is the same thing lol. Multi quote is necessary!
    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    ooks cleaner without it. I can re-enable but I prefer to highlight quote.

    ahhh okay , I see what you mean....
    Burger Motorsports
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  14. #89
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    So it's a Mitsubishi MHI 25G?
    2011 335is DCT, JB4 + MHD BEF, stage 2 LPFP, e50 + 50/50 meth, FBO, MT ET Streets when needed


  15. #90
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    Ill ask some DSM guys. They use them more than Evo guys.
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  16. #91
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    That's kind of old technology though compared to the Garrett based FP turbos and the BW turbos. Why not just rebuild your old BW?
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  17. #92
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    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    So it's a Mitsubishi MHI 25G?
    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    That's kind of old technology though compared to the Garrett based FP turbos and the BW turbos. Why not just rebuild your old BW?
    Yea pretty much older technology but it was the only thing that can be made into a stock location bolt on that is 550whp capable. The EFR I had was not able to be rebuilt and was pretty much maxed out already. Thanks for your help brotha.
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  18. #93
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    From the guys at NASIOC

    surge is when the compressor wheel basically "stalls" and then spins back up again. it puts alot of pressure on the bearings by spinning insane rpm then rapidly and repeatedly dropping.
    typically 2 things create this type of surge. 1) theres a pressure leak and the turbo can barely keep the desired boost pressure, but by doing so is out of its efficiency range and has to slow down a bit. so in conjunction with compressor surge we also have super hot air leaving the turbo due to an over worked compressor.
    2) for whatever reason, at that point in the rpm band (33-4000) there's more air being supplied than the motor can injest. with such small turbos that have been proven countless times to work on a 2 liter, i find it hard to believe- but I'm open to suggestions.


    on a side note: i decided to log the car again yesterday. the boost pressureisnt as rock solid as i thought. it fluctuates a bit with the surge. between .5-1psi fluctuation. the wastegate duty cycle stays constant though...
    theoretically: if it is wastegate flutter, how do i go about diagnosing it- especially since I've tried 2 different turbos (each with their own wastegate.) one of which that was brand new. and I've also tried 2 ebcs.
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  19. #94
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    Since you're internally gated, are you sure it's compressor surge and not WG flutter?
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  20. #95
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    two last ideas from me is: TPS vs throttle plate. is your TPS calibrated? throttle fully open at 100% TPS? Last is timing. You guys had to time the motor though since this was a swap. If valve timing is off a hair this could cause reduced flow through the head. Not sure it would cause compressor surge but anything is possible i suppose.
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  22. #97
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    I'm not sure why your MAF would jump around like that and I don't know first thing about Cobalts. Your MAP and everything else looks stable. Wish I could help buddy..
    Click here to enlarge

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    3 out of 3 members liked this post. Yes Reputation No
    You can get that jumpy MAF readings from forcing a turbo in to the surge zone in low RPM/high load if you have Variable Valve Timing.
    if you advance the intake cam and retard the exhaust cam past a certain point you are Over Scavenging the combustion chamber. At this point the turbo is pushing more air then the motor can ingest and therefore it surges and you get bouncy MAF readings.

    Now, if you don't have VVT on both sides then is more then likely a load measuring error. Does the Cobalt have a MAF and MAF sensors?

  24. #99
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    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    Since you're internally gated, are you sure it's compressor surge and not WG flutter?
    I'm not exactly sure. I'll have to check it might just be the spring is not strong enough.

    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    two last ideas from me is: TPS vs throttle plate. is your TPS calibrated? throttle fully open at 100% TPS? Last is timing. You guys had to time the motor though since this was a swap. If valve timing is off a hair this could cause reduced flow through the head. Not sure it would cause compressor surge but anything is possible i suppose.
    AFAIK, if it was a little off the car would not even be drivable.

    Click here to enlarge Originally Posted by dzenno@PTF Click here to enlarge
    I'm not sure why your MAF would jump around like that and I don't know first thing about Cobalts. Your MAP and everything else looks stable. Wish I could help buddy..
    No worries man, just if you saw anything I didn't see you know. It's compressor surge or wg flutter.

    Click here to enlarge Originally Posted by black e Click here to enlarge
    You can get that jumpy MAF readings from forcing a turbo in to the surge zone in low RPM/high load if you have Variable Valve Timing.
    if you advance the intake cam and retard the exhaust cam past a certain point you are Over Scavenging the combustion chamber. At this point the turbo is pushing more air then the motor can ingest and therefore it surges and you get bouncy MAF readings.

    Now, if you don't have VVT on both sides then is more then likely a load measuring error. Does the Cobalt have a MAF and MAF sensors?
    We do have VVT, I just got cams and vavlesprings as well installed on the motor. The cams come with a larger fuel lobe so It might be the issue that he can't calibrate it correctly.. idk. It does have MAF sensor. I did a MAF relocate post turbo rigth before the throttle body after the intercooler.. Thanks for your response. I'm going to forward this to my tuner.
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    Sorry, I meant to ask if it has MAP and MAF?

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