OK I have ruled out that it is the diverter valve because I have the stock IX on there. Yes, the car is tuned properly as well. So, what happens is during wot at low Rpms the Turbo will spool and then start to flutter like crazy And then stop completely. Any suggestions?

 

It could still be the stock diverter valve if it's now leaking. Replacing my stock IX DV with my APS DV fixed my flutter issue a couple years ago.

 

Flutter during spoolup usually is compressor surge, correct??

 

Correct on compressor surge what's a cure for it?

 

maybe something on the exhaust side. one of my friends had a bad wastegate spring and he had surge issues.

 

Chad Block can explain it way better than me, but he has led me to believe otherwise. Or more precisely, that most people mistake flutter for compressor surge. I did.

 

does it happen in 1st, 2nd and third gears or just when you are in 4th or 5th on the freeway at fairly low rpm, but wot?

 

its your wastegate actuator going bad. get an fp 18 or 25psi WGA, it should fix all flutter.

 

Did you do a boost leak test?

 

+100000000000000000. for the answer my only happen in 4th and 5th WOT at low rpm.