Dreamsmith

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?

rcdash

iTrader: (18)

Could be the transmission? Do you have an upgraded valve body? Those will increase line pressure dramatically under load.

Sounds like something else though by the way you describe it - like a rev limit cut... I think the e-manage can log - see if you can log what is happening to AFR when it happens.

Dreamsmith

i dont have a valve body upgrade yet, but i dont think its the trans.

it kinda feels like a rev limit cut, but it happens after i shift not before.

ill get log by today and see if there is a AFR problem, but from what my tuner says there isnt any problem with the AFR.

anyways is there a chance that it could be the MAF?

rcdash

iTrader: (18)

What are you using to measure load (to control fuel injection; sorry not that familiar with emanage)? MAF or MAP? If it's MAF, you may have maxed out it's range (which I think is around 6 psi).

03BrickyardZ

You probably shouldn't jerk it while driving.

Reality350

iTrader: (25)

when you shift and it pauses, do you feel a "thud" when it engages again?...

If so I would get your tranny checked out.

NickRaine78

iTrader: (4)

2004Black350z

iTrader: (37)

LMFAO i was coming to 2 say the same thing. Beat me to it

rr_z33

iTrader: (2)

upgrade that ems i used to get the same thing.

TheBlackPearlZ

iTrader: (15)

just going to say that...ems upgrade with a new tune COULD take care of it...but more then likely a tranny issue...almost definately a tranny issue actually