Hi, hopefully someone can help me, my 850 T5 is behaving very strangely when pushed.
In any gear, if you put your foot right down, the boost needle goes off the end of the gauge, the car shudders and 'coughs then the boost drops off, if you keep your foot down it shoots back up then does the same thing until you back off the throttle.
The guy I bought the car from didn't mention any mapping being done but I don't remember my old auto ever boosting over about 3/4 up the gauge, could it be to do with that, it has a large cone filter instead of airbox too. I am at a loss and it is doing my head in, I can only drive at half throttle which is ok for normal driving but obviously no fun.
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