I read threads when I need a break from work, trying to learn from other peoples experiences as they toil over ten different things that could be causing today's 1.8T issue. I find it enjoyable...learning how to take your money pit and make it more fun to drive and more reliable.
My R1 diverter valve ripped and since I didn't buy it, APR wouldn't warranty it. I don't like that they warranty the buyer and not the part...so I did not buy another R1 valve. I bought the 710n diverter valve and installed it in the "reversed" orientation because, after reading too much Audizine, that's what I thought I should do. On my APR 2+ tune, I could now only spike to 16-18 psi and then taper off to 9-10 psi by redline. Obviously something was wrong, but after checking for boost leaks, vacuum leaks, N75 functionality, wastegate actuation, diverter valve vacuum, throttle body relearn...nothing seemed wrong.
Since nothing else seemed to be wrong, and since this was the most recent change to the car, I decided I would reinstall it in the factory "pull" orientation rather than the reversed "push" orientation...just to see. This is a brand new Kayser 710n diverter valve that holds vacuum. After this quick change, the low boost fluttering is gone and I'm hitting target boost pressure. Maybe the valve is faulty, but for now, I am choosing to leave the 710n valve in the factory orientation.
It was a simple change with a huge effect. So I spent all that time chasing problems that weren't there, when the first thing I should have done was to check the part that I just changed. Lesson learned...again...
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