discopotato03

Hi all , from one of the stroker threads I noticed people talking about taller ratio diffs and a choice of gear ratios .

From what I can tell my 6GSR has close ratios 1-2 and 2-3 but opens up 3-4 and 4-5 . Would I be right in assuming that RS versions have closer/shorter 4th and 5th gears ratios because they were the striped out light weight competition basis cars ?

I'd be interested to know what various gearbox ratios USDM Evos got and diff ratios as well .
In a torquey stroked car I can see the advantage of all close ratio gears and possibly taller final drives that put 5th overall approximately where the wider ratio shorter diff'd cars are .

The only thing is that cruising around the burbs with all close ratios would mean a lot of short shifting which is fine if you don't mind sort of thing .

Thanks in advance , cheers Adrian .

38six

iTrader: (6)

I don't know if all those options were available in the US straight from factory.
From what I understand the JDM 5th gear is very useful for road race track prep car.

38six

iTrader: (6)

Take a visit to TRE website it will give you a good idea on gearing and final drive options.

BluEvo210

I thought the Evo RS (JDM) just had a shorter final drive.

The Evo RS in the U.S. market had the same gear ratios as the GSR (while we could get an RS).

I've heard of people fixing up an Evo for (tarmac) autocross and building a 9000rpm motor with a 4.111 final drive, so they could go 90+ mph in 2nd gear. However, I'm under the impression the fastest Evo drivers just shift to 3rd gear.

Edit: OK, I just calculated it...
9000rpm with a 4.111 final drive would get you 85mph in 2nd gear
8000rpm with a stock final drive gets you 95mph in 3rd gear, which is probably what they do with the fastest Evos in the "Street Modified" class.

For road racing, there's probably no advantage to messing with the final drive ratio.

BluEvo210

Here's what I've got for some US-spec Evos:
Evo VIII (all had the same gear ratios, and I think Evo IX was the same)
1st: 2.93
2nd: 1.95
3rd: 1.41
4th: 1.03
5th: 0.72
Final: 4.53

Evo X:
1st: 2.857
2nd: 1.950
3rd: 1.444
4th: 1.096
5th: 0.761
Final: 4.687
Compared to the previous Evos, it has closer gear ratios.
It also has shorter final drive to help move its fat @$$
(or possibly offset the tires having a larger rolling diameter).

BluEvo210

I see TRE is showing different gear ratios for the Evo VIII and Evo IX.

I think I'd rather have the Evo VIII ratios for street driving (But it seems a lot like splitting hairs).

For 2nd through 5th gears, they're saying Evo IX has the same ratios as my X.

Are these transmissions interchangeable?
I thought the X had a completely new transmission (and everyone knows about the new engine), so I'm not taking it for granted that they have the same bolt pattern.

38six

iTrader: (6)

Evo VIII has a taller gear ratio from 3 -5 & the Evo IX has the taller first gear. 2nd is the same in both. What TRE can do is make the gearing tailored to your liking by using the two & or changing the final drive. However when you add the final drive it changes every thing again, so he can make the gear shorter or taller depending on your application.