Passon Performance 5-speed
AJ/FormS,
Would you mind doing those calculations with the ratios from the A855? 3.73 gears and a 315/35/17 tire? I think it's 25.79" diameter.
What are the Passon ratios? IIRC they are very nearly the same as the 2.66box, right? The A833 ratios are 2.66-1.92-1.40-1.00
with 3.73s the road ratios would be
9.92-7.16-5.22-3.73-2.61 (.70Passon overdrive)
with the 25.79 tall tires these get corrected to 12/12.895=.93, for a 12" radius, so
9.23-6.66-4.86-3.47-2.43. You only need to know the corrected when comparing to other combos that might be using different tire roll-outs.
With 3.73s and the .70OD, 65~2060rpm; not all cams will like this.
A 230* cam in a 360 likes 2200 to cruise, so 3.91s might be better, for a cruise of ~2160. This would also wake up the launch, and the 2-1 downshift at 30 mph, and your zero to 60 ET, if you can make it hook; 60~5870 with 3.91s.
The low-rpm cruise will want lots and lots of timing; then you can lean it out, and that's where the fuel economy starts.