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Board: Porsche - 911 - 996 - Turbo Language: English Region: Worldwide Share/Save/Bookmark Close

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    Jan 27, 2008 11:51:48 AM

    fredb
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    fredb
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    something wrong

    Yesterday my car reached it's top-speed at 335. But i felt it was jerking. The pressure was oscillating between 0.9 and 1.3 bar. Does someone know what the right max pressure is?

    Jan 27, 2008 1:12:24 PM

    fritz
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    Reply to: fredb

    Re: something wrong

    Quote:
    fredb said:
    Yesterday my car reached it's top-speed at 335. But i felt it was jerking. The pressure was oscillating between 0.9 and 1.3 bar. Does someone know what the right max pressure is?


    It sounds as if your car may have been modified, in which case only the tuner would be able to answer that question.

    Jan 27, 2008 2:43:35 PM

    fritz
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    fritz
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    Reply to: fritz

    Re: something wrong

    Quote:
    fritz said:
    Quote:
    fredb said:
    Yesterday my car reached it's top-speed at 335. But i felt it was jerking. The pressure was oscillating between 0.9 and 1.3 bar. Does someone know what the right max pressure is?


    It sounds as if your car may have been modified, in which case only the tuner would be able to answer that question.



    After posting the above reply I realized that you have a 996 GT2, not a Turbo as I had assumed.

    Was the jerking caused as a result of running into the rev limiter at about 6.750rpm?

    Jan 27, 2008 4:22:47 PM

    Alex18_996CC Offline
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    Alex18_996CC
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    Reply to: fredb

    Re: something wrong

    335 was slow?

    Jan 27, 2008 7:35:33 PM

    fredb
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    fredb
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    Reply to: Alex18_996CC

    Re: something wrong

    it became jerking when it passed 6000 rpm. My car has a stock engine.

    Jan 27, 2008 8:37:29 PM

    fritz
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    fritz
    Loc: BaWü , Germany
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    Reply to: fredb

    Re: something wrong

    Quote:
    fredb said:
    it became jerking when it passed 6000 rpm. My car has a stock engine.



    It sounds as if your stock engine is homesick and wants to make a trip to the dealer.


    But it still pulled 335 km/h on the speedo!

    Jan 27, 2008 8:43:38 PM

    fredb
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    fredb
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    Reply to: fritz

    Re: something wrong

    Yes, and 325 on the GPS !!!

    Jan 27, 2008 8:55:37 PM

    fritz
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    Reply to: fredb

    Re: something wrong

    Quote:
    fredb said:
    Yes, and 325 on the GPS !!!



    I knew you'd had it modified! Top speed was supposed to be 319 km/h!

    Jan 28, 2008 9:18:19 AM

    Ferdie
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    Ferdie
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    Reply to: fritz

    Re: something wrong

    It indeed sounds like you ran into the rev limiter. Shouldn't be your fault if you mis-read it at that speed!

    Jan 29, 2008 4:43:56 AM

    fredb
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    fredb
    Loc: france
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    Reply to: fritz

    Re: something wrong

    Quote:
    fritz said:
    Top speed was supposed to be 319 km/h!



    i like to check what is supposed to be ......

    Jan 29, 2008 4:45:18 AM

    fredb
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    fredb
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    Reply to: Ferdie

    Re: something wrong

    Quote:
    Ferdie said:
    It indeed sounds like you ran into the rev limiter. Shouldn't be your fault if you mis-read it at that speed!



    i think i was in the rev, but before the car was already jerking since 6000 rpm.

    Jan 29, 2008 6:57:42 AM

    Joost
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    Reply to: fredb

    Re: something wrong

    It might probably help if you posted some picturs of your car
    -Joost-

    Jan 29, 2008 7:29:43 AM

    Crash
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    Crash
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    Reply to: Joost

    Re: something wrong

    And some videos .

    Jan 30, 2008 12:23:16 AM

    GT Offline
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    GT
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    Reply to: Crash

    Re: something wrong

    Could be fuel mass sensor, unless of course you were hitting the rev limiter. Common problem in 996tt series. Good to change them once every 2 years, tough to see when they start giving wrong numbers and you lose power gradually until they stop working.

    Jan 30, 2008 9:10:04 AM

    fredb
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    fredb
    Loc: france
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    Reply to: GT

    Re: something wrong

    Quote:
    GT said:
    Could be fuel mass sensor, unless of course you were hitting the rev limiter. Common problem in 996tt series. Good to change them once every 2 years, tough to see when they start giving wrong numbers and you lose power gradually until they stop working.



    many thanks for this technical response.

    Jan 30, 2008 2:20:32 PM

    Joost
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    Joost
    Loc: Dordrecht , Netherlands
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    Reply to: fredb

    Re: something wrong

    Wow... :O
    Thanks Fred, C'est une voiture trés belle!
    -Joost-

    Jan 30, 2008 3:34:48 PM

    fredb
    Junior
    fredb
    Loc: france
    Posts: 59, Gallery
    Registered on: Apr 18, 2006
    Reply to: Joost

    Re: something wrong

    and now, could you help me with the picture???

    Jan 31, 2008 6:12:23 AM

    Joost
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    Joost
    Loc: Dordrecht , Netherlands
    Posts: 8054, Gallery
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    Reply to: fredb

    Re: something wrong

    Ahm... no...:o
    I tried! Believe me, I tried!
    Thanks anyway, your car looks awesome man!
    -Joost-

    Jan 31, 2008 7:01:23 AM

    fredb
    Junior
    fredb
    Loc: france
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    Reply to: Joost

    Re: something wrong

    I trust you !

    Feb 1, 2008 10:04:22 PM

    fritz
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    fritz
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    Reply to: fredb

    Re: something wrong

    Quote:
    fredb said:
    and now, could you help me with the picture???



    I wonder ............?

    Great. I didn't even know I could do that!

    Man, I need to get a life.

    Nov 2, 2008 8:19:33 AM

    fredb
    Junior
    fredb
    Loc: france
    Posts: 59, Gallery
    Registered on: Apr 18, 2006
    Reply to: fritz

    Re: something wrong

    the answer is that the waste-gates were liking sometimes. The normal boost pressure is 0,8 bar. The engine cuts when it sees 1,3-1,4 bar.

    --
    RS6 600 HP.
     
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