Needs help in Gearing using Hayabusa

[Lotus7racer]

I am in the process of installing a Turbo Hayabusa engine

to my 92 Westfield SEi Wide. The current differential

(Sierra differential) gear if I am not mistaken is 3.3 or could be 3.6 (not too sure).

I want to use differential rather than sprocket type bike style.

Anyone out here can tell me what best differential gear ratio

that works best using Hayabusa engine?

I plan to go back to 13 inch tire (currently 15 inch). I also

contemplating to buy a gear and pinion to Kamdiff. They

offered 3.90, 4.11 & 5.11   Can someone calculate which one

will be the best suited to Hayabusa.

Thanks

Jaime

[Fat Arnie]

You want a tall diff to give you top speed.  Do you know the internal ratio's of the gearbox?  If so take this and your wheel dia (21" on a 13" wheel) and stick the data into the gearing calculator you can download from the link page at www.the-webbs.com/k2rum/k2home.htm

The Sierra diff was alos available in a 3.14 ratio which i think you will find is the best available for this application.

You can get the CWP sets from Phil Stewart at Road Race Transmissions in Shoreham Kent on 01959 525105

[garyo]

The bike engined cars list has a spreadsheet containing all ratios for most popular bike transmissions, including the 'busa.

http://uk.groups.yahoo.com/group/bike-engined-cars/