Having had my Fabia TDi chipped with a few other mods, it is cutting back to safety mode, this happens at about 105mph in 5th and 120mph in 4th. According to VAG-COM it is the boost controller or something (can't remember the exact fault code). The boost seems to reach 1.5-1.6 BAR. Any one else had this problem? Can it be overcome with VAG-COM or does the car need a different pressure map sensor?? Any help greatfully received.

My old one did it as well as about 125 in fifth when remapped, once. I'm keeping fingers crossed the new one doesn't do it at Brunters.

I believe a chipped 110 Octy owner had the same problem with autobahn-ing it. Seems sometimes the turbo thinks its overboosting (which I guess it is meant to when remapped) and it kills itself. Normally killing the ignition and restarting clears the safe mode, but doesn't clear the fault code on the ecu.

Hi Ninja Alex,

As Jason said, I had this problem last week in Germany on the autobahn & thought i had blown the turbo!

I was pulling approx 4100rpm at just 200kph when the boost went and I was then driving an SDi! Re-starting later restored the performance.

I will speak to Michael at Jabbasport about this when I can find some time.

Cheers,

John.

aha John... Thats the one - couldn't remember your nick...

I spoke to Mike when I had the current Fabia tested with the old Fabia's ECU running in it, and mentioned the cutting out at 125mph the old car had. He said he's never heard of it before but would keep his ears to the ground about it. Would be interested to know if he's found out anything, especially with the possibilty of a 160hp boost on top of my remap...

I know turning the ignition off and on cures it, but this not particularly good in the dark at 100+mph, also i get left behind when we go for a blast. I have heard of changing the sensor to a higher BAR sensor but it needs to be confirmed. The turbo peaks at a higher pressure in lower gears but it seems to be the constant build up that causes the problem. BTW turning the ignition off and on does clear the fault code on the ECU.

The turbo peaks at a higher pressure in lower gears but it seems to be the constant build up that causes the problem. BTW turning the ignition off and on does clear the fault code on the ECU.

interesting... very interesting... But as you say it was keep my foot planted for a good minute in fifth that caused the overboost cutout before, not hoofing it through the gears. I've not had this car above 110 for any length of time yet to see if anything similar happens, but it still pulled ok from 100-110. It's just when it's up there maxxing out it could occur again. :( Oh, this was all on private roads BTW... *cough!

Strange thing is though when I had my ECU adapted to my new car there were three fault codes, one being the overboost one, which must have been logged before the accident. As for the other two, you can guess what they were - something to do with being inverted, and auto-engine cutout due to that... Now when was that?