Final gear for s2000

[WhiteAP1]

Ive been reading a bit about changing the final gear ratio in my gear box. J's racing use 4.3, MCR use 4.4 i was just wondering if anyones got any advice of what sort of ratio to select, if anyones completed a mod like this what sort of gains have u got, whats involved and how much??

[AusS2000]

Do some research on the Kia 4.56 gear. It is the preferred option for non-FI and available quite cheaply from Kia.

There are also a range of Mazda gears that fit.

[chunky]

yea the most important thing is ur gear ratios

[WhiteAP1]

i hope this doesnt sound too stupid, but are u saying to put a KIA gear in, as in KIA the korean or whatever car company??

[AusS2000]

No, I'm saying put the same gear in that Kia put in (the Sportage). None of these companies make there own gears. I realise it sounds bizarre, but that is the reality.

[WhiteAP1]

oh ok. Now to be honest if someone asked me to describe what a final gear is id have absolutly no idea, what is it exactlly??

[AusS2000]

I just re-read your post and what you are referring to and what J's and MCR make is a Final Drive Ratio for the diff. The Final Gear Ratio in the gearbox is different. It is a fairly complex piece. A company called ATS (I think) made one quite early on.

What I am refering to is the Final Drive Ratio which is the crown and pinion gear in the diff. OEM is 4:1. There are 4.3, 4.4, 4.56 and 4.77 options (and possibly more).

http://www.bulletproofautomotive.com...ail.php?ID=837

http://www.bulletproofautomotive.com...il.php?ID=4241

[ROLLED]

hey aus do u know if there's a page with the gears, the affects on top speed and RPM differences at different speeds, comparison? or anyone for that matter?

[AusS2000]

Somebody on S2ki did graphs for various gearsets with engine speed vs. road speed. That sounds like what you want. If I can find it on S2ki I'll link.

[AusS2000]

Here's a How to:

http://www.s2ki.com/forums/index.php...pic=85687&st=0

[AusS2000]

Top speeds (in MPH)

X 4.1 4.3 4.44 4.777
1 43.2 41.2 39.9 37.1
2 65.7 62.6 60.7 56.4
3 90.9 86.7 83.9 78.0
4 116.1 110.7 107.2 99.6
5 139.5 133.0 128.8 119.7
6 166.5 158.8 153.8 142.9

[AusS2000]

Here's the post about Kia gears.

http://www.s2ki.com/forums/index.php?showtopic=182172