Turbo Shuffle

[R31Nismoid]

I was under the impression the surge port is the same thing as what holset calls their "map width enhancement" groove which fights off REAL compressor surge i.e. compressor "chopping" at WOT because you are running it outside what would normally be it's efficiency range or something like a mis-matched hot side. The slots/holes have the effect of making the efficiency islands on the compressor map wider. If they also cut down on light throttle lift noise, cool, but that's not their intended design function.

The 'chopping' as you call it, or compressor surge as what it correctly is... can occur anywhere/anytime in the RPM range, and not just @ WOT.

It can occur whenever the compressor is put into the 'surge' area as given by the compressor map.

[donkeypunch]

so nismoid, i guess we have 'hopefully' established that i have compressor surge, rather then shuffle, does the compressor surge damage the turbos?

thanks for ya help too.....

Edited March 30, 2009 by donkeypunch

[mturl84]

I had my turbos upgraded to the garrett 28/60's and am suffering from "turbo shuffle" as my mechanics called it and their a gtr specialist, what they suggested is to put a merge pipe to connect the inlet manifolds, i have stock BOV's but got aftermarket piping, i get the "shuffle" worst when goin up hills or just lightly crusing around, i've also herd a good gtr tuner can tune it out i stand to be corrected tho.