ken1436215443 Posted October 3, 2014 Report Share Posted October 3, 2014 the map is a proven tuned map. my turbo need a rebuild so i switch to a new turbo but my the car wont boost pass 12psi when fully warm up to operating temp but fine when cold/ half way warm up. turbo is brand new no boost leak or exhaust leak Quote Link to comment Share on other sites More sharing options...
John Tosh Posted October 4, 2014 Report Share Posted October 4, 2014 is the boost controlled by the ecu?have all the boost control pipes been fitted correct Quote Link to comment Share on other sites More sharing options...
Scott Posted October 6, 2014 Report Share Posted October 6, 2014 If you are using a new turbo some changes will likely be needed to the ECUs boost control, especially if using closed loop mode. If you can attach your base-map and a short log file showing the problem we can look into the issue. Quote Link to comment Share on other sites More sharing options...
ken1436215443 Posted October 11, 2014 Author Report Share Posted October 11, 2014 Thank you guys I found the problem. Im running GM LQ9 coil and two of them are weak not enough to notice a misfire but enough to make the car lazy and dull underboost. Is their a way to log or test for misfire on each cylinder under boost with the g4 silver xtr ecu? Quote Link to comment Share on other sites More sharing options...
Simon Posted October 13, 2014 Report Share Posted October 13, 2014 No not really. You might see a change in mixture but had to pinpoint a cylinder. EGTs would help in this case. Quote Link to comment Share on other sites More sharing options...
ken1436215443 Posted October 14, 2014 Author Report Share Posted October 14, 2014 if i log my rpm and it not stable that could also indicate that it misfiring? Quote Link to comment Share on other sites More sharing options...
Simon Posted October 14, 2014 Report Share Posted October 14, 2014 More likely a trigger issue which in turn could cause a miss fire. What trigger mode are you using? Quote Link to comment Share on other sites More sharing options...
Simon Posted October 29, 2014 Report Share Posted October 29, 2014 Areas to look and check would be the wiring of the cam and crank sensors, polarity will be critical. Arming voltages will need to be correct the arming voltage should be 50-70% of the peak voltage from the sensor at the given RPM. You will need a Scope to check this. If you have non resistive plugs fitted try a set of resistive plugs. Quote Link to comment Share on other sites More sharing options...
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