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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??
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.
yea the most important thing is ur gear ratios
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??
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.
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??
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
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?
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.
Here's a How to:
http://www.s2ki.com/forums/index.php...pic=85687&st=0
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
Here's the post about Kia gears.
http://www.s2ki.com/forums/index.php?showtopic=182172