Quote:
Originally Posted by Moggie
I presume that the normally open wastegate on the 335 must return to open under some kind of spring pressure. Could it be that certain cars have weaker springs so that when the turbos spool very quickly there is a delay in bleeding off the boost? Perhaps the higher the boost the slower the "return to open" is? Perhaps the procede is not anticipating the rate pressure build up and opening the wastegates a little late?
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This does have merit and was the reason why I was wondering if a slight adjustment to the wastegate rod might be beneficial. My car, and presumably yours, builds boost very quickly.
Since the wastegate opens off of vacuum, this vacuum must be bled off for the wastegate to return to its natural state of being open. Perhaps some vehicles just do not respond the same as you suggest. I may need to climb under the car and check out the wastegate connections further. I can see the rear turbo's connection and it is threaded so an adjustment can be made. Although I am sure this could be also be handled in software.
To add, I would see some small spikes even on V1 code. This was minimal to about 15 - 16 PSI; but it was there and limited most likely due to the slower build rate on V1 with the rear solenoid bypassed.