Gear box and box ratios.

[AXracing]

This one may sound a bit mad but I am putting TU engine in a mini with 10” wheels. I know there are a few people on the forum that are good at working out ratios but can any one tell me what box will see me 70mph in 5th at around 3000 to 3500 rpm if any? Best if it can be a later MA box like in the in a C2 or C3 as the clutch is not cable. Thanks

[raunchz]

http://i196.photobucket.com/albums/aa257/raunchz/IMG_2418.jpg
http://i196.photobucket.com/albums/aa257/raunchz/IMG_2420.jpg
http://i196.photobucket.com/albums/aa257/raunchz/IMG_2421.jpg

1.4 Westcoast box - too long ?

[AXracing]

That may be close with the diddy mini wheels on. What size tyres was that with? Thanks Raunchz

[Toad]

It takes a while to calculate...

There's an easy way though! Although you won't learn!! :geek:

http://www.gearboxman.co.uk/inforatios.html

You'll need to know the profiles of the tyres (including the width) to obtain the overal diameter of the wheels including the tyre walls.

[AXracing]

Thanks Toad that was a great help :y:

[Toad]

No worries.

[menmen]

VTS ratios:

1st. 41/12 (3,417)
2nd. 39/20 (1,950)
3rd. 38/28 (1,357)
4th. 39/37 (1,054)
5th. 35/41 (0,854)

Afer 2000y:

1st. 41/12 (3,417)
2nd. 39/20 (1,950)
3rd. 39/29
4th. 39/37 (1,054)
5th. 35/41 (0,854)

C2 VTS box has the same ratios as Saxo VTS after 2000, only differs with clutch housing (hydraulic clutch)
You can type that numbers into a gear calculator along with your tyre circumference and top rpm to calculate top speed in gears.

[gd16]

Put up the tyre sizes of the 10" wheels and it'll be a bit easier, no idea what they'll be, but once i know i can compare against all Saxo boxes in a few seconds.

Also - you'll be able to rebuild the gearset into a new casing. Which if its older internals, or needing a LSD - would be a good idea anyhow. I'm planning on putting my Quaife'd VTR box internals into a hydraulic box.