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    Oct 21, 2009 11:17:30 AM

    TTurbine
    Junior
    TTurbine
    Loc: Doha , Qatar
    Posts: 136, Gallery
    Registered on: Jul 27, 2006

    997 GT2 Loss of boost pressure

    What could it be?  i cannot get above 1.1 -1.2 bar in 2nd before i use to get 1.4 bar at 4500+ rpms , 3rd boost is 1.1 , 1.2 all the way to the limiter , 4th the same but goes to 1.2 - 1.3 briefly.....  all of this happend a sudden after  did a 0-300 run .. at first i though it was iats , so i let the car cool down... but the ambient was 25 degrees!!!  and my car was hitting 4000+ to the limiter on 2nd 3rd 4th 5th and 6th 15 minutes before the run!!!

     

    This  morning i tried the car and it still has the same problem i took it to the dealer they did a quick check on the hoses and did an obd scan and no problem!!

    i thought maybe because maybe the gas station attendant filled my tank with the wrong gas 90 octane europe!!  so i filled the car with 97 octane and ran it for 60 kilometers hoping the problem would dissapear but it didnt..

    what could it be?

    Smiley

    Oct 21, 2009 7:51:30 PM

    intouch1
    Rennteam Master
    intouch1
    Loc: Red Sea , Egypt
    Posts: 5752, Gallery
    Registered on: May 22, 2004
    Reply to: TTurbine

    Re: 997 GT2 Loss of boost pressure

    humidity ?


    --
    Speed has never killed anyone, suddenly becoming stationary... That's what gets you.

    Oct 21, 2009 8:14:18 PM

    TTurbine
    Junior
    TTurbine
    Loc: Doha , Qatar
    Posts: 136, Gallery
    Registered on: Jul 27, 2006
    Reply to: intouch1

    Re: 997 GT2 Loss of boost pressure

    No it wasnt humid at all , it just switched into a limp mode and still is in a limp mode the day after  , a stock tt would smoke it!!!

    Oct 22, 2009 7:15:37 AM

    intouch1
    Rennteam Master
    intouch1
    Loc: Red Sea , Egypt
    Posts: 5752, Gallery
    Registered on: May 22, 2004
    Reply to: TTurbine

    Re: 997 GT2 Loss of boost pressure

    strange....on the 997 turbo there was a recall campaign for sticking valves on the turbos.

    have not heard of issues with the gt2 however.

    maybe you wanna check that......


    --
    Speed has never killed anyone, suddenly becoming stationary... That's what gets you.

    Oct 24, 2009 12:39:56 AM

    GT Offline
    Senior
    GT
    Loc: london , United Kingdom
    Posts: 618, Gallery
    Registered on: Jan 14, 2006
    Reply to: intouch1

    Re: 997 GT2 Loss of boost pressure

     check AFR meters and also the dump valves. They are rubber and can develop small tears. Also someone must check whether there is a small leak in the air system; there is a tool for that. Problem is that the above issues usually don't show on the obd unless there is total failure.. So you need an experienced mechanic to check all those peripherals

    Nov 29, 2009 10:31:31 AM

    winwin
    Newbie
    winwin
    Loc:
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    Registered on: Jan 28, 2004
    Reply to: GT

    Re: 997 GT2 Loss of boost pressure

     I have the same problem with my GT2 too but it cures itself somehow.........

    what's wrong with the car?

    Nov 29, 2009 11:54:59 PM

    Haku Offline
    Pilot
    Haku
    Loc: TN , United States
    Posts: 481, Gallery
    Registered on: Dec 6, 2005
    Reply to: winwin

    Re: 997 GT2 Loss of boost pressure

     I had that happen to my 997 TT and found that the turbo hoses had come loose... the clamps have been known to be dodgy. The dealer replaced the hoses and the clamp.


    --

     2010 997 GT3- Black/Grey

    Nov 30, 2009 8:51:55 AM

    MKSGRM
    Rennteam Moderator
    MKSGR
    Loc: Germany , Germany
    Posts: 8098, Gallery
    Registered on: Jun 17, 2002
    Reply to: Haku

    Re: 997 GT2 Loss of boost pressure

    I had a total loss of turbo boost pressure last week. Now I know how the GT2 would drive without any turbo charges - not funny, I can tell you Smiley

    After I re-started the car the next morning everthing was back to normal function. Maybe an electronic issue Smiley 

    Nov 30, 2009 2:34:44 PM

    intouch1
    Rennteam Master
    intouch1
    Loc: Red Sea , Egypt
    Posts: 5752, Gallery
    Registered on: May 22, 2004
    Reply to: MKSGRM

    Re: 997 GT2 Loss of boost pressure

    must feel like a beetle on 1 cylinder


    --
    Speed has never killed anyone, suddenly becoming stationary... That's what gets you.

    Nov 30, 2009 3:18:41 PM

    MKSGRM
    Rennteam Moderator
    MKSGR
    Loc: Germany , Germany
    Posts: 8098, Gallery
    Registered on: Jun 17, 2002
    Reply to: intouch1

    Re: 997 GT2 Loss of boost pressure

    intouch1:

    must feel like a beetle on 1 cylinder

     Indeed Smiley I can tell you - I could not believe how big the effect of these two "little" turbo chargers is... At low speeds (in town) the car feels quite normal. But above 120kph you get the impression of driving a 120hp car Smiley

     

    Jan 23, 2016 10:00:44 AM

    Ammein Offline
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    Ammein
    Loc: Abu Dhabi , United Arab Emirates
    Posts: 3, Gallery
    Registered on: Jan 23, 2016
    Reply to: MKSGRM

    Re: 997 GT2 Loss of boost pressure

    so guys, how was the problem fixed?

    I'm experiencing the EXACT same problem and its driving me crazy. Took the car to the dealer and they couldn't find anything (no leaks, checked the pipes, o2 sensors) nothing...

    Jan 23, 2016 1:15:22 PM

    Moser
    Senior
    Moser
    Loc: Larnaca , Cyprus
    Posts: 535, Gallery
    Registered on: Nov 22, 2006
    Reply to: Ammein

    Re: 997 GT2 Loss of boost pressure

    HI Guys,

    I had an issue on my 997.2 TT, when I was overtaking a car and all of a sudden my boost just went. The car becomes so slow without those chargers it's insane.  The issue was a loose hose connector and it happened with two other turbos in Lebanon as well.  I had that same issue with the connector coming loose 3 times over my 4 years of ownership.

     

    Mo

    Jan 23, 2016 3:15:29 PM

    fritz
    Rennteam VIP
    fritz
    Loc: BaWü , Germany
    Posts: 10248, Gallery
    Registered on: Jul 23, 2003
    Reply to: Moser

    Re: 997 GT2 Loss of boost pressure

    Moser:

    HI Guys,

    I had an issue on my 997.2 TT, when I was overtaking a car and all of a sudden my boost just went. The car becomes so slow without those chargers it's insane.  The issue was a loose hose connector and it happened with two other turbos in Lebanon as well.  I had that same issue with the connector coming loose 3 times over my 4 years of ownership.

    Mo

    The intercooler to turbo hoses went through phases where 1) the fast coupling would come undone or 2) the actual reinforced rubber hose would rupture, but the causes of these faults were easy to spot from under the car.

    @ Ammein: Did the workshop check that the VTG actuators had not seized up? They should have seen it, if it has. They can sometimes be freed by spraying them with WD40, if there is no mechanical damage yet. 


    --

    fritz

    Jan 23, 2016 3:48:36 PM

    Leawood911
    Rennteam VIP
    Leawood911
    Loc: Kansas, USA , United States
    Posts: 6920, Gallery
    Registered on: Aug 29, 2006
    Reply to: fritz

    Re: 997 GT2 Loss of boost pressure

    Turbo boost valve goes bad and leaks over time.  This causes extra lag time and much reduced boost. Cheap repair. EVOlution Motorsport sell an upgraded part for a couple hundred bucks. Works like a charm and it's like new after the replacement. 

    Jan 23, 2016 6:46:12 PM

    Ammein Offline
    Newbie
    Ammein
    Loc: Abu Dhabi , United Arab Emirates
    Posts: 3, Gallery
    Registered on: Jan 23, 2016
    Reply to: Leawood911

    Re: 997 GT2 Loss of boost pressure

    The workshop checked the intercooler pipes and they carried out a pressure test for all pipes but all was okay. They also checked the o2 sensors and was working fine. I must say the local dealer here is very good, especially their workshop manager. After digging in from posts with the similar problem I've noticed that I couldn't find a proper answer to this problem as their can be many factors and its very sensitive and hard to find the cause.

    @frtiz @Leawood911 taking note of your comments I'll ask the local dealer to check them.

    Also would it help if I carry a 100-200 km/h test and compare the times my car get compared to what it should get (7.7 secs) or is it still supposed to give me 1.4 bar ? (Considering the weather is still the same as it used to be before the problem occurred)

    Jan 24, 2016 1:46:38 AM

    Leawood911
    Rennteam VIP
    Leawood911
    Loc: Kansas, USA , United States
    Posts: 6920, Gallery
    Registered on: Aug 29, 2006
    Reply to: Ammein

    Re: 997 GT2 Loss of boost pressure

    Certainly check. I had the same symptoms and the car is like new again. Ripped right through a set of rear tires in two months as proof. 

    Jan 24, 2016 11:14:58 AM

    Ammein Offline
    Newbie
    Ammein
    Loc: Abu Dhabi , United Arab Emirates
    Posts: 3, Gallery
    Registered on: Jan 23, 2016
    Reply to: Leawood911

    Re: 997 GT2 Loss of boost pressure

    I checked the 100-200 km/h (not by vbox; I was reading the speed from the speed cluster on the left and using the chrono on most runs and also the iPhone stopwatch). Ofcourse its not 100% accurate but on all the runs (done just over 10 runs) I was getting 7 to 7.2 secs max over and over again.

    On the runs I was doing with the iPhone stopwatch I had the display on bar. Third gear was 1.3 bar and on some runs I was getting 1.4 bar at around 5500-6500 rpm.

    Is the car performing better than it should, is it performing just as it should and the lower temperature here (it was varying between 18 to 21 degrees celsius when I was doing the runs at night) fuel was 98 RON

    Let me know what you guys think..

    Jan 24, 2016 12:13:06 PM

    fritz
    Rennteam VIP
    fritz
    Loc: BaWü , Germany
    Posts: 10248, Gallery
    Registered on: Jul 23, 2003
    Reply to: Ammein

    Re: 997 GT2 Loss of boost pressure

    I've only just read the original post in this thread. I initially thought you were complaining of a complete loss of boost pressure, as described by MKSGR in his post, but I now think you are probably just experiencing a drop off in boost due to the effects of your warm climate. 


    --

    fritz

     
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