Would like to know if my Z is on par with others.? Not suggesting that you speed. Just want to find out if other tires, wheels and other mods make much of a difference. Wheel size diffently does because speedo is calibrated to a 17" stock configuration.
Horse power shouldn't matter because rpm is rpm.

Numbers taken on I 5 to LA from SF slight head wind, daytime, 82 degree,clear, flat, straight away.
Rpm as measured on counsel and mph from digital reading from guage pods.


2003 silver touring with Injen Cai, Stillen Cat-backs,Stillen brakes, Stock 17" wheels and stock Bridgestone Tires. Oh yes 5AT, 6500 mi on the car and tires

3000 rpm= 77 mph
3500 rpm= 91 mph
4000 rpm= 104 mph
4500 rpm= 117 mp
5000 rpm= 128 mph
5500 rpm= ?????
6000 rpm= ?????
6500 Rpm= ????

Did'nt try higher, was'nt really sure about the stock tires(rateing)and the tire pressure, I was running at the time ? Inquiring mines want to know!!!

 

i havent paid attention to RPMs when I'm @ 90+ MPH, but @ 3K rpms, I'm @ 80 mph for sure


17" stock wheels & tires
6MT

 

Please check again. Be as accurateand honest on the set up of the RPMs. Do it a few times to see if it comes the same. Weather and road conditions as well please. Passengers? Thanks for participating

If your right and the other numbers check out , that would prove that the manual trany would have a slight edge. HOW MANY MILES WE'LL SEE, My car with mods would be at least a couple of hundred lbs heavier then yours. Oh yes the driver weighted in at 245 lbs.

 

ive looked at it numerous times before, and know that @ 3k rpms, I'm at 80 mph.... I weigh 100 lbs less than you but oftentimes have a passenger who will make our totalweight = yours

 

yup 80=3000, that means 160=6000 and redline isnt till 6600 too.

but anyway, gearing is gearing, a car identical to yours would not be any faster or slower without changing its wheel size and or gears. not just hp. also headwind doesnt matter, even in a automatic the torque converters lockup as to not have any loss.