I have an idea which is probably not new but I think it is worth taking a look at. I was thinking of putting the following mods to begin with.

-3.9 Final Drive
-Nismo R-Tune Cams
-Nismo VTC Pulley
-Technosquare ECU

Now this mods coincide I think b/c the 3.9 will keep u in high rpms, the cams come alive at high rpms, the vtc pulley maintains low end torque, and the ECU gives u the Rev limit to 7100 to take advantage of top end power.

What do u guys think?

 

A lower rear end gear ratio will not change the gear spacing one bit. If you shift at a certain RPM in first, it will always drop you to the same RPM in 2nd regardless of the rear gear. All it does is provide you with better acceleration off the line. From then on, it averages out to about the same as before. It might be helpful in an autocross where 2nd gear may be slightly too tall and either force you to make the most of what you can in 2nd or shift to first(which is the hardest gear to rev-match smoothly). Lowering the gear may force you to shift between 2nd and third, but these gears tend to be easier to work with then 1st and 2nd.

Cams can certainly help if they are designed correctly for the application.

The VTC pulley? Variable timed cam pulley? or did you mean sprocket or gear? I mean if that is what you are talking about what does it do differently than the OEM one? I believe the VTC sprocket is infinitely adjustable within it's range of adjustement. So unless there is a benefit to extending beyond the minimum and maximum adjustment, I see no point.

ECUs generally have a minor boost in performance, but good ones produce real gains.

 

The 3.9 final drive will PUT you in the higher revs faster so as to take advantage of the cams, but it won't KEEP you there any longer (as the above poster stated). A lower final-drive ratio (higher numerically) with no other changes will generally reduce ET's without changing trap speed greatly. You will need the extra RPM's to cover the same distance as you were before, due to the shortened final drive ratio. This means more shifts for the same distance with less time between shifts.

'04 G35X Graphite/graphite, NAV, wood, premium