[Supreme1906]

What might be the best/most practical all-wheel drive transmission system for a dual DC motor setup? It seems logical enough to me that if you have all that torque available, you could see some amazing results with all 4 wheels pulling...

I'm trying to conceptualize a project I might want to undertake, but my ambition outweighs my expertise in this area. Any thoughts? For the purpose of this exercise, forget cost.

Thanks...

[DavidDymaxion]

I think these guys have been most successful at it:
http://www.proev.com/

They are AC, but I don't see why DC wouldn't have worked.

Note that there are many very fast, successful race cars with RWD. It takes an inordinate amount of power to exploit AWD (about 300 hp in 1st, 450 in 2nd, 700 in 3rd, 1000 in 4th), otherwise the lighter RWD will be faster. All that presumes dry pavement, on dirt or snow it's a different game, there you do see AWD dominance.

What is really awesome is with A123 Systems batteries you can make enough power that you could really exploit AWD. Good luck finding an AWD driveline tough enough for 1000 hp, though!

Originally Posted by Supreme1906

What might be the best/most practical all-wheel drive transmission system for a dual DC motor setup? It seems logical enough to me that if you have all that torque available, you could see some amazing results with all 4 wheels pulling...

I'm trying to conceptualize a project I might want to undertake, but my ambition outweighs my expertise in this area. Any thoughts? For the purpose of this exercise, forget cost.

Thanks...

[aeroscott]

Honda transverse mounted trans with custom half shafts . All built with race grade parts . AC, Tesla , Ford Ranger EV etc all use the transverse layout .

[Supreme1906]

That's the question that inspired this whole thing. Even Tesla couldn't solve this issue without much difficulty, so I wondered how could I with my finite budget. Even the Veyron's tranny is purported to handle only 1100 ft/lbs of torque, much less the 1700-2000 some EV motors could put out.

However, its funny you should link me to that site, because I was thinking of setting one motor to the front wheels, and the other to the rear. They do seem to have had some success with that set-up, so at least I know its feasible...

Thanks.

[Bowser330]

well the racer in the link isnt using a transmission, hes using two open differentials...so...that could be an issue if you plan to go DC..

So if you plan to use DC like me, siamese is my only shot...

[CroDriver]

Originally Posted by Supreme1906

That's the question that inspired this whole thing. Even Tesla couldn't solve this issue without much difficulty, so I wondered how could I with my finite budget. Even the Veyron's tranny is purported to handle only 1100 ft/lbs of torque, much less the 1700-2000 some EV motors could put out.

The Veyron had had problems with the gearbox. It's a high-tech 7 speed DSG gearbox with a double clutch. It's very sophisticated and that's why they had problems with the torque.

I think that there are differentials that can take easily more than 1000 nM (the Veyron has 650). Some firms are producing custom differentials for racing applications so we could make our own with the ideal gear ratio for us.

[CroDriver]

Originally Posted by Bowser330

well the racer in the link isnt using a transmission, hes using two open differentials...so...that could be an issue if you plan to go DC..

So if you plan to use DC like me, siamese is my only shot...

I'm currently in a siamese 11" Kostov project on the rear diff (Mazda RX-8) but my plan is to make a double-siamese with AWD when this project is done.

[mjcrow]

Direct drive to 2 of these http://www.dutchmanms.com/1_irs_centers.html (1 in the front and 1 at the rear with the same ratios) should handle pretty much anything you can throw at them, but you may have to run the front diff upside down to fit it, depending on your choice of vehicle. Maybe Subaru WRX , Mitsu Evo, Celica GT4, Porsche Carrera 4 . All will need substantial work to fit the rear motor (except the Porsche ), i.e. cutting the floor and adding structural members to take the motors weight and loading.

Not impossible but expensive, and you did say forget cost!

[Supreme1906]

I might be able to score an '06 Mustang for next to nothing. (I could barter it from a friend in exchange for services I am already providing his firm.) So that's the car, and I was aiming for the specs of the Ronaele 300/600E. But I didn't want a simple drag racer. I wanted an electric car with that could perform more like a GTR. I mean, this would be my first electric build so I wouldn't be swinging for the fences, but I wanted to at least do something a little different.

I was definitely thinking of independently powering the front and rear ends, but how would connecting the motor directly to the differential affect everyday driving and/or street legality? Further, is a transmission even necessary for electric applications, provided you are using custom differentials?

[mjcrow]

If it's a '06 Mustang then my 2c would be to forget 4wd, the chassis isn't designed for it and making room for driveshafts to run and finding suitable hubs/suspension could be problematic. But don't despair, a '06 stang can be built to handle quite well, aftermarket parts in that area are off the shelf.

To match the 600E you need 2700Nm and 450Kw (they use a DC motor), which is really up there performance wise, maybe Major or the other gurus here could help out with what is available to match those specs (Custom 13" maybe and Zilla2K).

Mounting direct (i.e. without a gearbox) isn't a problem as long as you have enough torque and power. If you really must go with 4wd on the "06, then you need to talk to an engineer and find out what's possible (and legal) and at what cost.

Here is a '02 Stang Electrified http://www.diyelectriccar.com/garage/cars/47