Autodream1436215442 Posted January 14, 2009 Report Share Posted January 14, 2009 Hi everyone I have this problem and I can't think of what can cause it, this happens on a VG30DETT and a RB26DETT under low boost seem to be fine so I increase my duty cycle in my boost map 95% of the time the car will pull nice no misfire no knock but as soon as it get above 6000 rpm the boost drop flat then it will build boost again there are times that it pull through to 8000rpm. I have gone over the log many many time to see if any significant changes in the log. AFR stays nice and flat and not hitting any limit. boost come on strong some one please tell me they have the same problem. its driving me crazzy. Quote Link to comment Share on other sites More sharing options...
Guest Dave Posted January 18, 2009 Report Share Posted January 18, 2009 how is the boost control setup what other compensations are active is engine temp compensation pulling boost out etc what does the logs show the wastegate duty cycle doing when the boost drops this will help you find your problem Regards David Heerdegen [email protected] Quote Link to comment Share on other sites More sharing options...
Autodream1436215442 Posted January 20, 2009 Author Report Share Posted January 20, 2009 I only have the duty cycle at 20%, there are no air temp compensation, I try hooking up a greddy profec-B just to make sure it not the boost setting in the ecu thats doing it. map limit was set to 400kpa, rpm is 9000, launch off antilag off . RPM looks smooth so it cant be trigger error it seem like when duty cycle inceases this problem occurs, but only around 6000rpm. it not a cut it just falls afew hundred rpm then back up. what confuse me most is I seen another Link ECU call Vi-pec in a friends 300zx does the same thing. anyone here runs over 600whp on Link ECUs? Quote Link to comment Share on other sites More sharing options...
Guest Dave Posted January 20, 2009 Report Share Posted January 20, 2009 I would suggest you send through a copy of the pcl file and a log of this happening as it could be many things from bad tuning to soft valve springs Have you checked that the blow off valve is not leaking Regards David Heerdegen [email protected] Quote Link to comment Share on other sites More sharing options...
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