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Join Date: Sep 2012
Posts: 350
Occasional buck/surge/lurch when lifting under boost

One more little thing that is going on with my car - as I've mentioned in other threads - I think my WUR tuning is pretty much where it's going to be. Car is running great.

But occasionally when I lift when at WOT and high boost the motor will buck - I would say it is more drastic than a surge or a lurch. I have a brand new bypass valve (note - car is a 964T so a different bypass valve system than the 930's use). I would say it seems to happen when at a high boost and I lift suddenly or quickly, but not so much if I lift slowly.

While in the middle of the tuning process I seem to recall this happening more when it was running richer - so maybe I should go a little leaner?? But maybe I'm way off...

My wastegate was apart recently when fredmeister modified it and he said the diaphragm was good.

Any input appreciated. Thanks!

'91 911 Turbo
'00 Audi S4 highly mod'd DD
Denver, CO
Old 05-20-2013, 02:21 PM
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