Yes, that's a good setup. Top end (theoretically) is above 200MPH with this current gearing, however, you'd need a LOT more power to get the car to 200MPH. Lets say for argument's sake, double the power you've currently got. The faster you go, the more drag you have... Drag is caused by 2 different issues on the car: 1) the aerodynamics of the car's body, and 2) the rolling resistance of the tires. The faster you go, the more both of these dragging variables increase. There is actually math you can do to figure exactly how much power you'll need to beat these forces and get the car to 200MPH.

Keep this in mind: A Corvette ZR1 weighs about 100Lbs more than the 370Z and has 638HP. It's drag coefficient is LOWER than the Z's and the rolling resistance is almost identical. The top speed on the ZR1 is approx 206MPH. Keep in mind, that car was designed to reach that speed and has the correct suspension to do so. A Z would need a suspension over-haul, better aerodynamics, and WAY better tires to achieve the same goal with 640HP. The Z is not designed for straight line performance. It's designed for the canyons, and as far as I know, there's not a single canyon you can break 130MPH in.

but how can we make the 370z aerodynamic better ???
is there any way

With sport package it has a .29 drag coefficient. That is excellent.

^^^ Lamborghini diablo has a .19 drg.c and the C5 Corvette has a .21 drg.c. I don't think .29 is that great, IMO. But to reduce drag, you can do quite a bit. First off, a belly cover is a good idea. Most expensive high performance cars have them because they reduce the air bubble under the car preventing lift. Next, you need lower rolling resistance tires... (This only reduces drag and it's not good to go fast without grip, so I don't recommend this). You'll need a good front aero kit. Not every body package removes drag... Some add drag. So you need to pick wisely. Next, fold in your side mirrors (or remove them) and remove your wind shield wiper. :D At speeds of 120+Mph, you don't need them anyway. Then you'll need to lower the car as much as possible. Stiffer suspension would be required to handle the down force. You'll need to shave your door handles and anything sticking out of the car in any way shape or form, you'll need to remove.

All that should get you down to .27 or .26 Drg.c LOL! :D

A C5 vette has a .29 drag coefficient in stock form. A C6 is .28.

LOL! You're right. I wonder where I got .21... :( Hrmmm...

I'm guessing a bullet?


:D

Never heard of a .21. .22 maybe...

I did all sorts of research on drag coefficients when I was researching a donor for an electric car project, and for some reason, I remember seeing the vette as .21. But I wiki'd it and it IS .28

I hope my memory isn't going...

I hear it's the 2nd thing to go, but I've forgotten who told me this. :(

^^^ LOL! I'm 25... I BETTER not be losing my memory yet!