i have a g35 coupe 2006 A/T with a built engine running vortech s/c

on full throttle when i shift from 2nd to 3rd and 3rd to 4th, i get a jerk for 1-2 sec then it goes on normally, this only happens when i shift past 6000 rpm
My tuner checked the A/F its all perfect, he said it might be a MAF spike (running emanage ultimate)

any suggestions?

 

Sounds like you are bumping against the rev limiter

 

but i am getting the jerk after shiftting!

could it be that the ecu is too slow to process?

how can i confirm that and fix it?

 

Any trans mods? Can you provide anymore detail? Is there a delay in shifting?

 

yes, the stock tranny shifts pretty slowly... so u will probably hit the rev limiter even AFTER u shift. you can remedy this by getting a valve body upgrade.

 

WHat EMS are you using? Split Second box or something else?

 

I shift at or below 6k, thats what my shop told me to do. I think you are putting too much strain on the tranny by shifting like that.