View Single Post
Old 11-05-2009, 09:16 PM   #4 (permalink)
MetroMPG
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 12,537

Blackfly - '98 Metro
Team Metro
90 day: 67.07 mpg (US)

ForkenSwift - '92 Metro EV
90 day: 125.37 mpg (US)

U.F.O. - '00 Insight
Team Honda
90 day: 85.75 mpg (US)
Thanks: 302
Thanked 1,020 Times in 568 Posts
Quote:
Originally Posted by darcane View Post
For a single set of helical cut gears, 98% is good, but not tremendously higher than average.
That's good context. Any idea what average would be?

The Solectria Force Geo cars also all used custom single speed gearboxen.

I couldn't really get away with it in the low power ForkenSwift... well maybe I could (the Citicars were all single speed 48 volts). But I like to have the ability to downshift to keep amps low when cruising (or climbing very steep stuff at low speed), and upshifting when I want more power.

I actually do use all 5 gears - but mostly 2 & 3 with a bit of 4 once in a while. I could probably get away with just 2, 3 & reverse. Wonder what kind of difference it would make...
__________________
Latest project: removable Geo Metro boat tail
Latest test: Massive cardboard air dam on a Geo Metro


www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote