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Math is really not my strong point. So check it and let me know if this is right. If i use the calculator that i linked to at first all i have to do is punch in the final drive numbers and tire size and it gives me the stock compared to the updated results. If my 3rd gear is 1.26 and R+P is 4.12 that would give me an axle ratio of 5.19 correct?? If i stick that number in the calculator along with new tire size(185/80-15) it comes out to a top speed at redline of 36.6 mph and a theoretical top speed in 6th of 91.8 mph. If the VW was in 4th that would give me 51.9 mph in first and top speed in 6th of 115.3 mph. Does this sound right or am i doing it wrong. I figured the easiest way was to just use the final drive on the calculator (its assuming chain + sprockets) for the Vw final drive instead of doing all the calculations seperate. It also gives me a good idea of what the stock busa ran at certain rpm with stock gearing for a good comparison.
Weddle makes almost any gear ratio you may need . I have all 4 gears non stock ratios in my 091.
Looks right to me. You understand it correctly. FWIW, I doubt that a non turbo busa will actually pull to redlne in 6th with an 1800# car but the math is correct.
Just look up weddle and VIOLA! ,you have exactly what you need. If it were me though I'd invest my coin in an 091 if doing custom ratios and use the 3 rib as an anchor.