Ok I have 2 03 se Maximas. One is an auto and the other is a manual. The auto if in first gear going say 15 mph and I put it to the floor will throw you back in the seats and light up the tires as it accelerates. If in second doing 5mph and I floor it the car instantly takes off. Great throttle responce. From a dead start if I floor it it will light up the tires as it takes off.

Now my 6 speed if doing 15 mph and I put it to the floor it doesn't have the same power feel. It will not light the tires up or push you back in the seat. Same for second. From a dead stop if I drop the clutch and floor it it will not spin the tires unless I dump it at 3500+ rpms. Slam second hard it again it won't break the tires loose.
Also if I accelerate slow and say I put it in second ease into second with very little throttle and after I'm in the gear I then hit the throttle hard it feels like.it slows down for a 1/4 of a second before it accelerates.
Don't know if it's a clutch problem. Or something else is off. No coded are showing.
All I know is that every manual transmission vehicle I have had has always had great response.

Side by side doing 50mph and flooring both cars my manual will slowly pull on my auto but it just doesn't feel like it has low end power

Oh and 0 to 110mph my manual was 1.2 seconds faster. Shouldn't it have been more of a difference.

Any suggestions are greatly appreciated.

Edit: both cars have brand new tires.

 

ECU reflash OR...
ECU reflash AND a new Mass air meter.
Nissan actually sent the cars to market like this.

http://maxima.theowensfamily.com/tsb/NTB03-022.pdf

 

Thank you. Will get that done and see if that works