5 Spd to 6 Spd Conversion DIY - Toyota Yaris Forums

rob323 · 04-27-2010, 04:36 PM

With the 3.5 final drive, the engine would be far too low in the revs when cruising at 60 mph and probably use more fuel because of the lack of power available at those revs.

Mrhiguy · 04-27-2010, 04:45 PM

Quote:

Originally Posted by rob323

With the 3.5 final drive, the engine would be far too low in the revs when cruising at 60 mph and probably use more fuel because of the lack of power available at those revs.

Then just keep it in 5th gear. Here in the states we drive 65-75mph Average even though the speed limits are generally 65-70 mph.

Plus if 3.5 is too low for you. You can get a final drive from a 4 door Echo c150 with a F/D of 3.850.

rob323 · 04-27-2010, 04:52 PM

By ending up with taller gearing in each gear, all you do is make the car into a slug (more so). You lose the "close ratio" benefits of the C160 box.
Peak torque is developed between 4200 and 4400 rpm (depending on engine) so ideally, they are the revs you want to be doing while cruising for max economy.

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04-27-2010, 04:36 PM	#1
rob323 Don't drive it, RALLY it! Drives: 1999 echo PRC rally car Join Date: Oct 2008 Location: Joyner, Brisbane Posts: 321	With the 3.5 final drive, the engine would be far too low in the revs when cruising at 60 mph and probably use more fuel because of the lack of power available at those revs.

04-27-2010, 04:52 PM	#3
rob323 Don't drive it, RALLY it! Drives: 1999 echo PRC rally car Join Date: Oct 2008 Location: Joyner, Brisbane Posts: 321	By ending up with taller gearing in each gear, all you do is make the car into a slug (more so). You lose the "close ratio" benefits of the C160 box. Peak torque is developed between 4200 and 4400 rpm (depending on engine) so ideally, they are the revs you want to be doing while cruising for max economy.