kzr750r1 Posted March 13 Share Posted March 13 (edited) I'm still fighting something here. HW or Tune??? Not sure. Car has for a while been rough after startup until heat soaked. There are Group N motor mounts and now the Rallytech street insert with a new trans mount installed. As I recall was like this before the new motor with 100mm forged pistons and +1mm valve upgrade. The rest of the motor is stock ish. JMP vf40 and a clear up pipe with resistor mod. Trans was just rebuilt so lockup is good. TransGo kit installed. Yes it's pretty firm. 1 to 2 and 2 to 1 shifts are smoothing out, depends on how aggressive the accel or decel is being performed.. The rest all depends on how far into the torque request is being pushed. Very smooth otherwise. Tuner has settled me and were not knocking as was happening after the initial dyno tune. Currently on Rev 2. Issue is also the dreaded stumble. Seems any time it's at or near early boost it's hesitating. -1 to +2 psi. before and after that it's smooth. Went for a quick drive with the tuner in the car and he's not seeing any misfire, AFR look good. No granted this was a quick test. I just stopped in and he had 10 min to look with me. I have already changed the vac source for the fuel regulator. Pump was replaced before... Still happening. Average gas mileage is less than ideal. So last items to just chuck money at would be a new fuel regulator or injectors. Trying to avoid this if it's not the problem. Car has 258K on the clock. Edited March 13 by kzr750r1 Link to comment Share on other sites More sharing options...
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