Boost spike at throttle cut?
12-09-2010, 03:55 PM
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Boost spike at throttle cut?
I've logged my car many times, car feels very on/off. I've noticed from graphing runs. Between shifts(Tip) or just cutting the throttle after flooring it etc. The boost seems to spike a lot at times. The avg boost is down, then big spike at the end. Can this only be caused by a DV problem? Or can it be a boost leak? Doesn't seem like a leak would cause a spike. I've tested the DV's and they hold open with vacuum. I'm not sure if there is a better way of testing them or not? I've mityvac'd them open...I've pushed the diaphragm open with a socket and done the thumb trick.
Man my car is pissin me off!
Man my car is pissin me off!
12-14-2010, 12:28 PM
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could be a leak also
Had a similar issue and it was my N75 valve
Here is a quick boost DIY setup
http://www.vaglinks.com/Docs/Audi/C5...ure_Tester.pdf
Here is a quick boost DIY setup
http://www.vaglinks.com/Docs/Audi/C5...ure_Tester.pdf
Last edited by nyc.turbo; 12-14-2010 at 12:29 PM. Reason: not enough info
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