Mods vs Builds vs FI

njobe89 · 05-29-2015, 06:51 AM

Quote:

Originally Posted by Duc_Z09

He's telling you to go steeper with the driveshaft/wheel rotation ratio. It's like choosing a lower gear on a bicycle... you can accelerate faster at the expense of some top end speed.

Longer explanation: When you divide the number of teeth in your ring gear (the one that turns your rear wheels) by the number of teeth in your pinion gear (the one attached to the driveshaft that comes directly from the transmission) you get a number like 2.73, 3.69, 3.73, 4.10, etc... What that means is that the driveshaft makes 2.73, 3.69, 3.73, or 4.10 full rotations per full rotation of your rear wheels. The higher the number, the more power per rotation you're going to get. But the tradeoff is that your gears will red-line a lot faster (you'll have to shift sooner) and your top speed will take a hit (if you care about 150+ mph). You'll also be running at higher RPM per any given speed in a given gear, so fuel economy will suffer too. With a 6-speed you'll probably just end up running 1 gear higher than you were previously though.

damn it you sir are informative. i actually feel like i learned something new today and it's only 7:50am lol.

Quote:

Originally Posted by johnwiki

I did 4.08 and its a decent mod, good amount of acceleration increase. But you will cruise at higher revs. At 70 im at about 3000.

does anyone know how much time it can shave off the 1/4 mile or anything like that.

forza370z · 05-29-2015, 09:39 AM

I would either spend big money on a twin turbo kit or stay NA and do the 4.08 final gear. SC kit doesn't give you a big of a change in power especially the torque. 300ish ib/ft doesn't give you much excitement for the money. You will spend $10k for it.

According to a guy had both Stillen SC kit and GTM TT kit, the SC kit gave him some gain over the bolt ons but nothing crazy. Now he switched to a TT kit, he is not steering the steering wheel anymore rather he needs to grab the steering wheel because of the acceleration.

But TT kit will cost you at least $15,000 to do it right. If you decide to stay in NA, I'd recommend 4.08 final gear. Just my .02.

05-29-2015, 09:39 AM	#2 (permalink)
forza370z A True Z Fanatic Join Date: Oct 2011 Location: 403 Forbidden Posts: 2,512 Drives: 2009 NISMO 370Z Rep Power: 20	I would either spend big money on a twin turbo kit or stay NA and do the 4.08 final gear. SC kit doesn't give you a big of a change in power especially the torque. 300ish ib/ft doesn't give you much excitement for the money. You will spend $10k for it. According to a guy had both Stillen SC kit and GTM TT kit, the SC kit gave him some gain over the bolt ons but nothing crazy. Now he switched to a TT kit, he is not steering the steering wheel anymore rather he needs to grab the steering wheel because of the acceleration. But TT kit will cost you at least $15,000 to do it right. If you decide to stay in NA, I'd recommend 4.08 final gear. Just my .02. __________________ 09 PW 370z Nismo \| K&N Drop Ins \| HKS Hi Power \| Berk HFCs \| Work Meister S1 3P \| Project Kics R40 Neo Chrome Lug Nuts \| KW V1 \| SPC rear camber arms/toe bolts \| Southbend Stage 3 daily clutch \| Southband 19Ib Steel Flywheel \| ZSpeed CSC

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