Re: Crazy assed idea: Full Time Active AWD
 

Seriously I think the braking idea would be fail big time. It might work, but it's a piss poor way to do it. You try to dump 100HP through that brake for just a few seconds and you will overheat it. It won't spin fast enough to dissipate any heat. Build it, but I bet it will suck, wast 1/2 your power (how you can write this off, I dunno), and ultimately fail when it overheats. What's cooler, putting 1K HP to the front wheels or putting 500 and smelling some big brake rotor burning about to melt the pads off.

Re: Crazy assed idea: Full Time Active AWD
 

how the ---- is a diff-free t-case not full time 4wd? throw the tcase in 4wd, and you're in 4wd.

i seriously don't see how you think splitting the power via a diff and brake rotors makes it 'full time'


on the other hand, spend the money and just get a t-case that comes with a torsen or a center differential that can be user controlled (like sti's) you can split torque more to the rear, front, or lock the diff all together. much more logical than another foot of downward hanging ---- from the t-case that is prone to warpage and broken rotors from trail debris

Re: Crazy assed idea: Full Time Active AWD
 

Once again... I want to run in 4WD ALL THE TIME. EVEN ON DRY PAVEMENT. I cant do that with a T case that doesnt differentiate front to rear. And for those who say "---- ti, run it in 4wd all teh time, it doesnt matter" if that was the case, no cars would have center diffs. Audi, Subaru, Mazda, Mitsubishi, BMW, M-B, Dodge, Ford, Porsche, etc wouldnt bother with a center diff.

I'd love to put a torsen in the center. however, the only torsen that stands a remote chance of holding the power is an Audi center diff. Good luck finding one of those wouthout buying the whole tranny.

The only AWD case that is worth a crap with a torsen is the 242HD AMG. Used in the military Humvee. It has its own issues, like, overheating. And, it drops on the drivers side, I need it to drop on the passengers side. I'd love to flip it over, but, because of the overheating issues, it has a shaft driven oil pump that pumps the lubricating oil through a cooler, and into jets that spray it onto the bearings and gears and torsen differential. Flip it over, that aint gonna work right.

Only other T case that will take the power and still have fill time differentiated 4wd is the NP203, like I want to use, but, I'd like it to split torque front rear, which, it won't do if I loose traction on one end or the other.

The truck weighs 6K lbs. Of that, 3600 is on the front, and 2400 is on the rear. Coeeficient of friction for pavement to rubber for average tires is around .85 .85X3600 is around 3K lbs of grip. Ice on rubber is .06 give or take a bit. .06X2400 lbs is around 150 lbs of tractive effort. SO: If I have the rear on ice, and the front on pavement, it being full time differentiated 4wd wont do ---- for me without some way to force the power to go to the end I want it to.

Also, the 203 has a 50/50 split setting. All you gotta do is pull the little shifter lever, and it slides a collar over the differential in teh middle and locks it, to force a 50/50 split, but, then you loose the differentiation that allows you to run on dry pavement without damaging anything.

Finally, I'm sure you're saying "woopty do, why do you need AWD on dry pavement..." Well, remember, the front gets 3K lbs of tractive grip. Even on dry pavement the rear only gets 2K lbs of tractive effort. So, If I could get something like, say, the Audi diff that sents 60% to the front, and 40% to the rear, I'd have near perfect power distribution for the tractive effort of the truck based on its weight.

Make sense now?

Re: Crazy assed idea: Full Time Active AWD
 

i wasn't aware that you were looking to make a daily driven road warrior out of this, and i can't see where you stated such in this thread. why not get a 1-way bearing setup that allows the rear driveshaft to backpedal the bearing when turning, giving you better turnability? differentials that have 1-way bearings make ---- for engine braking, but installing one on the rear driveshaft output might be a little closer to what you're looking for in terms of drivetrain bind and ---- blowing up when your tires dont wanna break traction

Re: Crazy assed idea: Full Time Active AWD
 

Why don't you make a t case out of an irs rear end? Use a supra rear end sideways or something and then mate the axles to the front and back like that.