Zoran

OK, somebody please explain this to me.

I know our individual gear ratios are 3.133, 2.045, 1.481, 1.161, 0.971 and 0.811, and that the final gear ratio is 4.1.

However, if you plug this into a max-speed-in-gear calculator (curtesy of josh3io), you get about 20% higher speeds than actual.

Looks like there is another 1.2 gear multiplier somewhere in the transmission (driveshaft?).

My question is: is this normal? Do other cars have this? Should this additional gear multiplication used in wheel torque computation (as in the 2nd gear S2000 vs. Boxster on Auto-x thread)?

Sorry if this has been answered before. I did a search and couldn't find anything.

Zoran.

josh3io

In my spreadsheet there is a column for driveshaft ratio, with value 1.2. I think it's the ratio of the shafts in the tranny, or something like that Someone at one point did corroborate that with hard evidence.

and yes, that should be taken into account when calculating wheel torque.

cdelena

There is a secondary reduction gear of 1.16 that must be factored in.