12-31-2004, 06:10 AM
With more power (forced induction) we face the need for taller gears. Quckest way to do this is to change the final drive gearing.
That said, here's a ludicrous question: Does tC's 4AT final drive fit on 5MT tC? I know it is much taller, even too tall, but please indulge my curiosity.
Yeah, 3.333 final drive would be a better choice, but not having that choice, above question does seem appropriate...
12-31-2004, 08:11 PM
planning to go faster than 130mph eh?
12-31-2004, 11:41 PM
I don't see how that'd work, but hey...
I do agree with getting taller gears for boost. At the same time, you need a speed cut defenser such as one made by HKS. That will get your ECU to let you go faster than 130. Taking your tranny to a machine shop might be your best bet. You could have a specific ratio fabbed up to suit what you need, and what speed vs acceleration you're looking for.
01-01-2005, 07:10 PM
Yeah, custom gears would indeed be the best solution. Especially, since our 1st and 2nd gears have a 2500rpm diff between them (meaning, shifting at 6000rpm from 1st, you get to 2nd at 3500rpm approx.) and that is before turbo's full spool, so you'd have a small lag - not optimal.
However, custom things aside, final drive swap is usually a quick and cheap way to lengthen/shorten your gears. E.g., on my 350Z, 5AT final drive (3.35) will fit comfortably in place of stock 6MT (3.54), or I can plug EVO3.9 FD (yup, 3.9) and get 10% boost in accel for the price of shorter gears.
Since my tC already has problems with grip, and that is with stock engine hp/tq, I can imagine the slipping and maniacal shifting I'd have to do with any forced induction. I'd rather have some use of that 1st gear :).