Quote:
Originally Posted by blommer
there's a reason why VF35 is used as a standard turbo for the AUDM GDBs. It has a smaller compressor wheel and had P15 housing as compared to the VF34. AS the AUDM heads are smaller, the amount of air entering is restricted, thus creating the flutter. Upboosting the VF35 will also cause fluttering as there's only 1bar or so of boost the AUDM can take in efficiently.
Whereas the VF34 came standard on JDM GDBs because it had bigger ported heads to complement with it.
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In that case, wouldn't these cars be "fluttering" at full throttle, full boost also? They only seem to flutter at part throttle, at lower RPM suggesting that the problem stems from the tune, not the restrictive heads. The turbo is blowing more compressed air than the motor can take in causing the compressor to stall. If the heads were the cause, then this would happen at higher RPM aswell, right?