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OK ,this is what I've come up with using Albin R&P(5.43:1) and Albin 3rd(1.5:1) and 4th(1.0:1). Assuming the busa is capable of turning 10500 in each gear which makes countershaft =6862 RPM with busa in (1.043:1)6thgear. Use 31" tires.Assume no tire slip in sand.1st-3.80:1=30.66 MPH2nd-2.06:1=56.58 MPH3rd-1.50:1=77.69 MPH4th-1.0:1=116.54MPH Look better? Albins makes a boatload of 3rd and 4th gear ratios.I'm open to suggestions on the ratios for 3rd and 4th.
One problem I see with this the way you are talking is you will never shift a 091 as fast (or easy) as you can shift the Hayabusa motor. Shifting any VW style tranny is usuallays the buggies (with it) biggest downfall if the tranny can deal with the raw power.
I think generally you could get away with using the busa tranny for shifting through all the gears. But if you decide to do a holeshot, or are going to be really leaning on it at slow speeds, you would be better to shift the busa to 5th or 6th, and shift with the 091 to keep from hurting anything. The only problem will be remembering what gear everyone is in, and where to mount both shifters so that it is convenient.