Take a regular Stage III TT and a 600rwhp TT, both with rev limiters at
7450 rpms (which is the standard for a JWT ECU). I'm using citations
link for these calculations, since it's easier to work with. All these
numbers are just examples as to what might happen if you install the
Leader gears; I do not have factual evidence of the top speed of a Stage
III TT.With the stock 3.692 rear end, both cars can mechanically hit 197mph,
however, the Stage III TT doesn't have enough power to reach that, so it
might only do 170mph (which is ~6428rpms in 5th gear and it hits a wall
where the weight and aerodynamics won't let it go faster). The 600rwhp
TT will definately reach 197mph at the limiter of 7450rpms. If you put Leader gears on both cars, the outcome is going to be
opposite. The Stage III TT might now reach 177mph, which is all 7450rpms,
because the larger gear makes the engine work less to achieve speed,
and it'll be higher in the powerband when it gets closer to the speeds that
aerodynamics would otherwise limit. Inversely, the 600rwhp TT will now be reduced to 177mph because it hits
the rev limiter at 7450rpms, which is now at 177mph instead of 197mph. Either way, 177mph is DAMN fast for any car and how often do you really
go that fast to need the extra 20mph that the stock gears will give you
over the Leader gears? In my opinion, it all comes down to preference. Do you want bragging
rights about your near-200mph capable 300ZX or do you want to
accelerate faster down low? If you do a lot of racing from low speeds or
stops, the Leader gears might be beneficial to you. If you do a lot of
high speed 150+ mph runs (and just might need to go over 177mph),
maybe you'd want to stick with stock gears and just modify your car to
make enough power to reach the limiter in 5th gear. Hope this helps.
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