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Old 12-27-2008, 08:49 PM   #50 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.71 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car - '14 Mitsubishi Mirage ES (base)
90 day: 52.48 mpg (US)
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Paul & Sabrina: you amaze me. (Well, anybody who's not slow at projects, like me, amazes me.)

A thought after seeing the temp protection circuit: you might want to ramp up the current when exiting thermal protection cut-off. Same if you incorporate low voltage cut-off.

I've hit the low voltage protection feature with the junk batteries we first had in the ForkenSwift, and it was pretty violent: First gear, going slowly up a little hill, controller cuts current, car coasts to a stop. Foot still on throttle, pack voltage rebounds above the threshold, car jerks forward. Pack voltage falls, controller cuts current, car stops. Pack voltage rebounds, car lurches. Stops! Lurches! Stops!

Just a thought. Either that, or incorporate a high pedal safety feature that gets checked any time the controller goes from 0 current to some current request.
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Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
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www.MetroMPG.com - fuel efficiency info for Geo Metro owners
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