fwd based awd?

JDM GT Four, ST185RC and ST205.

Re: fwd based awd?

Postby CMS-GT4 » Fri Dec 24, 2010 4:27 pm

celicat93 wrote:Real World Demonstration of Viscous Coupling AWD

http://www.youtube.com/watch?v=FSZVoBHv-vM

So why don't I have the problems with torque steer (especially from a standing start) and spinning tires like I do with my FWD GT? Why do I feel a more positive acceleration from the rear? Or is it just in my head? When I had my GT, I would often have my front tires break loose, even when I wasn't trying to get on it (and yes, the tire tread was very good, pressure maintained, etc.), I've never had that problem with an All-Trac, with 65 more HP and lbs of torque.



That Volvo is not a viscous coupling lock like that of the gtfour. That is a straight VC with no center diff. See link. It also looks like it has more bits involved in its system as well.
http://www.awdwiki.com/article.html?inc=vlv

If you want to find cars with a similar system as our look at:
# Lancia Delta Integrale (with Torsen in rear axle)
# Ford Escort RS Cosworth (with Viscous-Coupling LSD in rear axle)
# Mitsubishi Lancer GSR, 3000 GT VR4. (with Viscous-Coupling LSD in rear axle)
# Subaru Impreza and Legacy manual versions (with Viscous-Coupling LSD in rear axle)
# Toyota Celica GT4 (with Torsen in rear axle)
# Bugatti EB110 (set to 70% rear bias)
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Re: fwd based awd?

Postby klue » Fri Dec 24, 2010 6:48 pm

Cool video, ours works like that in real world applications but from my experience the respond is much faster than what your seeing on that Volvo.in plain English : I think the important thing to make sure everyone is understanding FIRST is the way how torque is normally split before the LSD comes into play. EVERY wheel generating traction is receiving 100% of the engines torque. YOU CAN NOT split that unless there is a change in TRACTION not even wheel speed(as in a turn). The LSD will allow a small speed difference and still maintain an equal torque split.

LIMITED SLIP DIFFERENTIAL

allows LIMITED wheel SLIP, while still maintaining DIFFERENT speed between wheels(so your car can corner without 4wd drift)

good thread
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Re: fwd based awd?

Postby celicat93 » Fri Dec 24, 2010 8:40 pm

Thanks guys, that makes me feel better. :)
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Re: fwd based awd?

Postby CMS-GT4 » Mon Jan 10, 2011 9:37 pm

A video of a gtfour playing in slick conditions. Might add to the thread.
http://www.youtube.com/watch?v=QDRMRbnq ... _embedded#!
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92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
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Re: fwd based awd?

Postby Nitro_Alltrac » Mon Jan 10, 2011 10:10 pm

I didn't know John would take the Princess out in the snow! Pretty cool.
Mike

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Re: fwd based awd?

Postby GTFOURST205guy » Fri Jan 14, 2011 3:43 am

FLASHBACK wrote:
GTFOURST205guy wrote:i don't think any awd system would give more power to the wheel that's slipping. if you were in a fwd car
and you were taking a corner and the wheels started slipping, would you start flooring it to get more traction?


i know that on the prelude, i think like 3rd or 4th gen, they had a system where even though it was FWD, it had a weird traction bar system that if one wheel starts coming up and spinning, it will do something with the power to help it regain balance

http://www.preludepower.com/forums/show ... p?t=306108

unless im reading it wrong


yes a lot of cars have systems where it "does something with the power" but it gives the power to the wheel with the best traction not to the wheel with the least traction. more power does not = more traction. sadly, this logic escapes most women in winnipeg which is why every intersection in this horrible city is literally more slippery than a skating rink.
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Re: fwd based awd?

Postby Wicked Toys » Thu Jan 27, 2011 8:31 pm

Nitro_Alltrac wrote:I didn't know John would take the Princess out in the snow! Pretty cool.


I didn't think I'd ever see this either. I was at TN when Princess saw first rain. Nice Vid.
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