fuel cuts maybe

[koston33]

First off running stage 2+mscai 91. Did a run today and on my 3rd to 4th shift I felt a nasty hesitation. From the start of 4th after having serious power through third, I felt a big drop in power. Almost a hestitation, then a jump in power and I was back. I'm guessing fuel cuts, but what should I be looking about to be sure. My fuel pressure? What numbers would suggest a cut.

 

[MSMS3]

Did you have DSC on or off? On my way to work today I was just fooling around on a two lane country road with an asphalt surface with some imbedded gravel. I ran her up in third gear and powershifted at 5,500 rpm to fourth, the tires chirped and DSC abruptly interrupted the wheelspin, then she was back on power again.

Just a thought. With your tune you may be simply breaking the front tires loose if the road surface is less than perfect. I could be wrong, but look for the simple first.

 

[koston33]

Dcs was on. It didn't feel like that was the problem, but I'll try and see.

 

[djthom]

do you have a way to monitor rail fuel pressure? it should not drop below 1400. if it does then you will need to upgrade the fuel pump.

 

[mazdasp33d]

i know before my AP, i had huge fuel cut in like 5th gear, car would jerk and bog down. but the AP took car of that.

 

[mazdaspeed32007]

my fuel drop would feel like someone blocked my intake or something then when fp would bounce back it would pull again about 600 rpm later. mine was down to like 800!! i still get it a little with the new internals to about 1400 but thats just from a hard 2nd to 3rd shift. i think it doesnt keep up with my shift. a little calibration should fix that to make sure it all opens up without hesitation betwen shifts.

 

[koston33]

I'll check my ap. I'll post a log when I can