project: dogbox transmission for st205 Options

[tufy]

Ater i had several transmisson proplems. i realized that i need a stronger one. i decided to build a custom gearbox. so i can decide for ratios. what would you chose if you build one?
here is some ratios

......................Standart...................fensport.............custom
1 st gear......3.38 - 57 Km/h.............3.58....................?
2 nd gear.....1.91 - 100 Km/h...........2.045..................?
3 rd gear.....1.26 - 150 Km/h............1.33...................?
4 th gear.....0.92 - 210 Km/h............0.97...................?
5 th gear.....0.73 - 239 Km/h............0.73...................?

Final drive 4.285............................3.933...................?

can any one tell me what is relationship between final drive and gear ratios.
if gear ratio x final drive ratio is equal, speed is same.

those are thinks that i am planning to have.
*seq. Shifter

*new input and output shafts,
staright cut gears,
dog clutches,
hubs,
forks

*final drive (pinion and crown), front & rear


*front lsd
(not sure about front lsd, fensport is using stock one)

This post has been edited by tufy: Mar 8, 2007 - 6:34 AM

[playr158]

Theoretically, the final drive changes the overall ratio to taller or shorter gearing, so by the looks of it the fensport has a bit higher top end, but i see the individual gears themselves are a bit shorter so it MIGHT cancel itself out, regardless the fensport might give you another 10-15 mph on 5 gear.

5th gear has the same ratio as stock so it shouldn't perform any different ?

[Bitter]

Theoretically, the final drive changes the overall ratio to taller or shorter gearing, so by the looks of it the fensport has a bit higher top end, but i see the individual gears themselves are a bit shorter so it MIGHT cancel itself out, regardless the fensport might give you another 10-15 mph on 5 gear.

5th gear has the same ratio as stock so it shouldn't perform any different ?

but the final drive is different, calculate that into the math.

[tufy]

Theoretically, the final drive changes the overall ratio to taller or shorter gearing, so by the looks of it the fensport has a bit higher top end, but i see the individual gears themselves are a bit shorter so it MIGHT cancel itself out, regardless the fensport might give you another 10-15 mph on 5 gear.

5th gear has the same ratio as stock so it shouldn't perform any different ?

but the final drive is different, calculate that into the math.

i think final drive drive is pinion and crown right?
st205 should have 2 set. one in transfer box, one in rear lsd.. and they should be same ratio..