Boost problem
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Boost problem
Hi
Our 996 TT with TechArt Stage II is having some problems.The car has around 13000 miles on it and is 2001.
It also has the Evo V-Flow and custom catback-exhaust with no silencers (Nicely loud
) but they are not currently installed to eliminate few things that could cause the problem.
The car goes to limp mode when acclerating hard which limits the boost to 0,4 bars. The error code says that the car is boosting less or more than the ECU is excepting it to boost. The difference is about 25% and this allways seems to happen under when pedal is to the metal. Naturally every restart resets the car back to normal but the problem comes back within the first few pulls.
So far the local dealership hasn't figured what causes the problem. The car has been in the shop for two times and on the first time the problem was diagnosed as a bent plate (from exhaust swaps) blocking the other wastegate from working properly. On the way home from the dealership the problem came back at the first pull so back to the shop.
On the second time the pressure sensor of the boost pressure was seemed faulty and switched to a new one. This seemed to cure the problem but after one day of driving limp mode stroke again when acclerating so the car will head to the dealership again.
While the dealership hasn't found the cause of problem it has determined that there isn't any pressure leaks in the system and also the DV's were changed to Baileys to be sure there's no problem with them. The MAF has been changed some 3000 miles ago.
Any ideas what could cause the problem ?
Could it be possible that the ECU (software by TechArt) just can't handle the flows with the straight pipes and the V-Flow and that's why it's really messed up now? Those two little upgrades are nice because of more power and glorious sound but if they are a bit risky with the ECU or other parts they are not worth it. Also the lambda sensors behind cats take too much stress with the straight pipes and they will be in need of replace soon. What kind of experience the others here have with straight pipes and a lot of track driving ?
Thanks for your comments and help. Hope the professionals here could give some information !
Our 996 TT with TechArt Stage II is having some problems.The car has around 13000 miles on it and is 2001.
It also has the Evo V-Flow and custom catback-exhaust with no silencers (Nicely loud
) but they are not currently installed to eliminate few things that could cause the problem.The car goes to limp mode when acclerating hard which limits the boost to 0,4 bars. The error code says that the car is boosting less or more than the ECU is excepting it to boost. The difference is about 25% and this allways seems to happen under when pedal is to the metal. Naturally every restart resets the car back to normal but the problem comes back within the first few pulls.
So far the local dealership hasn't figured what causes the problem. The car has been in the shop for two times and on the first time the problem was diagnosed as a bent plate (from exhaust swaps) blocking the other wastegate from working properly. On the way home from the dealership the problem came back at the first pull so back to the shop.
On the second time the pressure sensor of the boost pressure was seemed faulty and switched to a new one. This seemed to cure the problem but after one day of driving limp mode stroke again when acclerating so the car will head to the dealership again.
While the dealership hasn't found the cause of problem it has determined that there isn't any pressure leaks in the system and also the DV's were changed to Baileys to be sure there's no problem with them. The MAF has been changed some 3000 miles ago.
Any ideas what could cause the problem ?
Could it be possible that the ECU (software by TechArt) just can't handle the flows with the straight pipes and the V-Flow and that's why it's really messed up now? Those two little upgrades are nice because of more power and glorious sound but if they are a bit risky with the ECU or other parts they are not worth it. Also the lambda sensors behind cats take too much stress with the straight pipes and they will be in need of replace soon. What kind of experience the others here have with straight pipes and a lot of track driving ?
Thanks for your comments and help. Hope the professionals here could give some information !
Last edited by Kaizu; Aug 14, 2006 at 01:47 PM.
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Joined: Jul 2003
Posts: 3,670
Rep Power: 189
I would look at the inlet pipes. If you have an inlet leak it would cause a request Vs actual issue. Also what are the wastegates adjusted to?
It is possiable it is the ECU however most of the time it is a MAF offset issue and the ABS/PSM lights pop on.
It is possiable it is the ECU however most of the time it is a MAF offset issue and the ABS/PSM lights pop on.
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Joined: Feb 2005
Posts: 4,660
Rep Power: 254
I would remove the V-flow and run it and see what happens (putting the stock intake back in should take less than 1 hour). Unfortunately I had problems and it wasn't until I removed the V-flow that the problems went away (3 blown MAFs).
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No problems with inlet pipes, also the wastegates are now checked and are okay...
What the f....it still goes to limp mode (0.4-0.5 bars) after a pull or two, maybe we should ship the ECU to TechArt and have them put a new software ?
I also heard that because it's a -01 it has Beru plugs, not Bosch plugs like the -02 and later models, maybe those old Berus are not anymore up to their task...?? (the error code is not about misfire though...it's about wrong boost levels)
wross, the V-Flow is long gone and still the same situation...
What the f....it still goes to limp mode (0.4-0.5 bars) after a pull or two, maybe we should ship the ECU to TechArt and have them put a new software ?
I also heard that because it's a -01 it has Beru plugs, not Bosch plugs like the -02 and later models, maybe those old Berus are not anymore up to their task...?? (the error code is not about misfire though...it's about wrong boost levels)
wross, the V-Flow is long gone and still the same situation...
Last edited by Kaizu; Aug 14, 2006 at 01:46 PM.
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Joined: Jul 2003
Posts: 3,670
Rep Power: 189
FR5s?? Yes, get them out of there!! If it sees a misfire it will close the TB right up. A misfire that is caused by plugs will not show up until it is really bad. It could also be the boost valve causing the issue. Nevertheless remove the plugs and try that first. It needs to be done regardless.
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The plugs where changed today with the MAF(just to be sure) and the problem is still present 
Because the plate was blocking the other wastegate from working properly the dealership is suspecting that the turbo might be shot even tough they were previously inspected to be okay. Luckily they have another pair of similar turbos available so they're going to test if that's the reason for all of these problems.
If it's the turbo, then there's atleast a good reason to upgrade
Because the plate was blocking the other wastegate from working properly the dealership is suspecting that the turbo might be shot even tough they were previously inspected to be okay. Luckily they have another pair of similar turbos available so they're going to test if that's the reason for all of these problems.
If it's the turbo, then there's atleast a good reason to upgrade
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