When I am on 4th, 5th, 6th gear under full throttle, the car will hesitate. The RPM drop and then it raise up. Sounds like something is slipping. Can anyone help what happen to my Z. The recent mod I had on my HR is AEM dual intake, HFC, Y-pipe and fijitusubo exhaust and 3.9 final gear.

What I am thinking is something stickly or dirt inside the throttle body. SO I need to take out the intake and clean it up.

http://www.youtube.com/watch?v=EwvwfFllm3E

PLease help.....THANKS.....

 

Just a suggestion. Put a subject in the subject line like

Squeaking brakes

instead of

Help

Need help immediately

or

If you don't help right away I will die!

 

Thinking your clutch is slipping.

 

Wow, and you have no tune?

 

NO.........should I reflash the ECU and get tune?

 

Well i didnt have what you had so idk. before my tune i would get a hestitation around 2500rpms but nothing compared to what you have. Maybe someone else could shine in.

 

OK......Thanks........but I heard some people said the clutch may be slipping. although the 1st, 2nd, 3rd gears are strong........but 4, 5,6 were slipping like in the vedio clip. I was in the 5th gear in the vedio. I am so confuse now. Hope someone can jump in and help.

 

I completely suggest a retune. You will get benefits from an intake, but initially it really messes up your MAF readings (the volume of air your engine thinks it is pulling in). Every calculation your engine makes basically stems off of your MAF readings, so it throws everything off. I am willing to bet you are running pretty lean (as I was, I have Injen gen 3 intakes on my HR), and that when you get on it it just isn't throwing enough fuel at the situation. With a retune, your MAF will be recalibrated and everything should be falling back into place. After that, the tuner will balance out the fuel (you will probably need more across the map, but it will be much closer with the recal'd MAF). This is the reason that many suggest to stay with the factory air boxes. The car will still have some *** to it now, but a retune really makes it feel like a different car. I was amazed, dropped over a second in the time it took from me to get from 2000-7500 in 2nd gear. Lucky for me, I have a friend who can tune with the Cobb unit

If anyone disagrees with what I've said, please post and educate me better. I was not the one who tuned my car, just tried to pick up on what my friend was telling me and doing. Hope this helps you OP!

 

i heard if you put it in 5th and at 30mph and floor it if it doesnt go anywere that your clutch is slipping.

 

From what I understand, the way this "works" is that you put it in a high gear at lower mph, floor it, and if the rpm creeps up without the speed matching (i.e. the clutch isn't holding the engine and drive train together) then the clutch is slipping.

 

Moved to the correct subforum..

 

Thanks..........did you put your car into dyno after the tune? I am thinking to have the ECU reflash and tune. hope to get more HP.

 

OK......THANKS PEOPLE..........So thats I mean i need to get a nice clutch and flywheel in order to get rip the problem. Any good suggestion for the clutch?