RomanDave's Prius C swap

[CrankyOldMan]

Originally Posted by Neinris

Any plans on changing the gear ratio of the transmission? Very few here in YW have changed to the Scion xB1's (bB in most part of the world) transmission, for a higher final drive which would put more torque to the ground, but loses on top end speed. I personally would go with the Scion xD's manual transmission and just change out the 5th gear for better fuel economy, the FD is between the Yaris and the xB1.

The Echo uses the C15X gearbox family, not the C5X. That really limits the availability of options without going back to much older cars (80's/90's) to find compatible gears. That rules out the xA/xB/xD and all of the 1ZZ-based platforms.

That said, the shorter final drive is great for AutoX but awful for road courses. Way too much top end speed given up, even with the 0.725:1 super-overdrive from the C59.