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Old 08-08-2010, 06:02 PM   #61 (permalink)
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ah didn't realize it was an ac motor. Makes some things a bit easier for certain. The controllers are a bit pricey for that, isn't it? It would be interesting for a final tally of the cost once it's all said and done, kinda like what they did with the forkenswift.

I'm going to vote this into the list of things that ought to be stuck on the front page of ecomodder.com!

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I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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Old 08-08-2010, 06:24 PM   #62 (permalink)
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Originally Posted by brucey View Post
Also, my motor is 6000 RPM redline, with the Electric motor being 7500 RPM. So it's going to have a 1:1.25 ratio, which puts the electric motor pulley at a little over 6 inches wide. Gonna be a honker, and I believe it's the one part I'm not going to be able to build myself.
Since the electric motor turns faster, shouldn't its pulley be smaller than the crankshaft pulley on the ICE, (assuming you want to them both to be at redline at the same time)? Or is the ICE pulley larger than 6"?
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Old 08-08-2010, 06:33 PM   #63 (permalink)
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6" would be a rather small crank pulley, so I assume it is. According to his 1:1.25 ratio, he would have a 7.5" pulley on the crank
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Originally Posted by jamesqf View Post
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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Old 08-08-2010, 06:36 PM   #64 (permalink)
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I think it's 7.5", I'll go measure it now.
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Old 08-08-2010, 06:41 PM   #65 (permalink)
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5.25" Give or take. I'll confirm that # with some specifications later.

Err, that changes things a bit. Now I'll only need a 4.2" pulley.

Last edited by brucey; 08-08-2010 at 11:36 PM..
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Old 08-08-2010, 06:49 PM   #66 (permalink)
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measure twice cut once amigo

and BTW wow, that is some impressive mileage! Especially from the low mpg you were getting when you first started logging the tanks!
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Originally Posted by jamesqf View Post
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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Old 08-08-2010, 07:19 PM   #67 (permalink)
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I think if it were me, I'd try to get the efficiency curves for the motor, then match the most efficient rpm range to my anticipated cruising ICE rpm when I would use the motor the most. I'd just make sure the motor wouldn't overspeed if I ran the ICE to redline.
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Old 08-08-2010, 07:40 PM   #68 (permalink)
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okay, so you want 6k = 7.5k
and the 6k is on a 5.25" pulley so...
a you want a ratio of 1 : 0.8 (same as 1:1.25, just flipped)
so that would give you:
4.2"
right?
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Old 08-08-2010, 11:36 PM   #69 (permalink)
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Yup! Sounds right to me. I hadn't considered gearing it so it's only assisting below X rpm. I could double my torque to the wheels by simply only having it assist between 0 and 3000 rpm, where the car spends it's entire life. I'll have to check and see what it looks like when the motor is spun faster than it's rated for.

Shade: I haven't actually done anything yet :P But I did just come up with a much more enticing title than "E.A.P." I got nothing better, so feel free to come up with some.
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Old 08-09-2010, 01:31 AM   #70 (permalink)
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If you were to red line it; it would only be a strain on the bearings, and just for a few seconds, so I see no danger in "gearing" it low.
You can also get much more power out of it if it's running 7.5k rpm's.

so if you wanted to set it up at 7.5k = 4k, that would be a ratio of about 1 : .53
and for a 5.25 pulley you would need something around a 2.75" pulley. I don't know if it would be wise to go any smaller, as the surface of the pulley that transfers the power should not be too small, plus you should always have some room for miscalculations, driving too hard now and then, and other f--- ups that are bound to happen.

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