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Thread: Cobb AP Stage2+cpN+TIH+IC 98 spiking to 21.4 psi

  1. #1
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    Exclamation Cobb AP Stage2+cpN+TIH+IC 98 spiking to 21.4 psi

    So, subject pretty much covers it, anyone know if this would be an issue?

    The tune is "Boost Targets: ~19psi peak boost pressure tapering down to ~17.5psi by the 6700RPM redline, +/- 1.5psi."


  2. #2
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    Thought about getting an E-Tune?

  3. #3
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    Not uncommon to see boost spike 2psi higher. If its spiking to 21psi when its meant to be at 19psi shouldnt be a issue. Is the spike low in the RPM?

  4. Default Cobb AP Stage2+cpN+TIH+IC 98 spiking to 21.4 psi

    I also have the same tune and it spikes to 20.9 psi at times, but settles down the 19 psi and down the 17 psi at about 6500 rpm. Don't think there is anything to worry about. It is within the +\- 1.5 psi specs the COBB specify.

  5. #5
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    Default Re: Cobb AP Stage2+cpN+TIH+IC 98 spiking to 21.4 psi

    Post a log :-)

    Sent from my GT-I9100 using Tapatalk 2

  6. #6
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    Pretty sure i posted somethin about this in a thread as well... Mine is exactly the same map as yours.. Should compare your log to mine.

    I still haven't got a reasoning as to why i'm having this "hesitation" on WOT in 5th gear for like split second.

  7. #7
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    Default Re: Cobb AP Stage2+cpN+TIH+IC 98 spiking to 21.4 psi

    Log and post it in the diagnose my data log section. If we can't help try the Cobb forums and report back.
    No one will be able to tell you what the issue is without the logs

    Sent from my GT-I9100 using Tapatalk 2

  8. #8
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    Well, i've logged 3rd and 4th gear already and everything is good. It only occurs on 5th gear. Unfortunately, the speed of WOT on 5th gear becomes also quite dangerous, so i haven't been able to really get onto it and log it or try to replicate the situation.

    I have also notified Braden from the Cobb forums, he reckons it could be due to the fact that i am running above the safe levels of the tune and possibly would need few adjustments to the wastegate settings. But it could be few factors like fuel pressure drop (which all the other logs seems to do good), KR response, throttle closure and wastegate oscillation. But it'll need more logging to be able to tell properly.

    Its hard to replicate the problem when you've only encountered it twice in the entire time of having the tune. However, i'm going to see if i can get a 5th gear full run to see what's going on.

    Quote Originally Posted by Jmac View Post
    Log and post it in the diagnose my data log section. If we can't help try the Cobb forums and report back.
    No one will be able to tell you what the issue is without the logs

    Sent from my GT-I9100 using Tapatalk 2
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  9. #9
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    Default Re: Cobb AP Stage2+cpN+TIH+IC 98 spiking to 21.4 psi

    I'd check the plugs.

    Sent from my GT-I9100 using Tapatalk 2

  10. #10
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    Quote Originally Posted by Jmac View Post
    I'd check the plugs.

    Sent from my GT-I9100 using Tapatalk 2
    +1 change the plugs to 1 step colder ,may assist.

  11. #11
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    Plugs were changed like 5000km ago with the 1 step closer. Checked all the gaps before putting them in as well. Didn't have to make much of an adjustment.

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