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Nov 27th, 2014
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  1. When you use lots of throtle at low rpm, the varriable vains inside the turbo, move into a position that allows the turbo to spool up quicker at the lower rpm, as the car continues to accelerate above 2500-3500 rpm, if they are supposed to move back to the normal position. Its done like this to reduce lag and control boost pressure. Not enough boost pressure and car is slow, to much boost pressure engine blows up, so the ECU monitors the boost pressure and moves the varriable vains (with a vacuum diaphram) to control keep it in the best place or best performance.
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  3. The trouble is, customer x will use full throtle from low rpm all the time, but change up very early, all the time, the turbo is basically always running with the vains in the low rpm position, add to this the large ammounts of soot in the exhaust +100,000 miles and the vains get stuck. First time customer A goes over 2500-3500rpm the vains are stuck the turbo makes far too much boost pressure and so to save a blow up the ECU put the thing in limp home mode, customer notices lost of power until ignition cycle.
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