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Reversal transfer case
- Thread starter Shawns303
- Start date
MasteroFlego
Rock Crawler
Maybe you could save yourself sixty bucks and flip it at the diffs? (I think that might have a different effect though.)
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That's interesting. Good find.
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So instead of lifting the front wheel, it grinds it into the ground? I guess you can get the power to down that way. Still doesn't get rid of torque twist so to speak. Price doesn't seem bad for a complete aluminum piece if it actually works. 4 wheel indy= no twist. :mrgreen::mrgreen: It will be very, very interesting to see if the scale Trophy Truck crowd jumps on board with this product.
If you have a drive shaft connected to an independent drive line, you will have torque twist. If you spin it the other way it will twist the other way. Corvettes have a tube that connects the trans to the diffrential and makes it one solid piece.
Take a rear axle from an rc car. Lock the tires from spinning to replicate load. Hook up the axle to a t-case with drive shaft. Now hold the t-case in one hand and turn the input shaft. No matter which way you spin it the same thing will always happen(you may need to put something on the input to get enough torque). When you have two disconnected bodies transmitting load they will always try to spin in the opposite direction. The motor only provides the torque but does not do any frame twisting as it is solidly mounted to the trans, and t-case. Always twisting against each other, however the case itself acts to hold. All the twisting force and thus transmits no forces to the chassis.
Only two ways to combat twist. One is lower gearing. It takes less torque to move the vehicle. And two solid mount your driveline to itself. Ever see torque twist on an moa crawler?
Sorry for the drawn out response. I spend way to much time thinking sometimes.
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Take a rear axle from an rc car. Lock the tires from spinning to replicate load. Hook up the axle to a t-case with drive shaft. Now hold the t-case in one hand and turn the input shaft. No matter which way you spin it the same thing will always happen(you may need to put something on the input to get enough torque). When you have two disconnected bodies transmitting load they will always try to spin in the opposite direction. The motor only provides the torque but does not do any frame twisting as it is solidly mounted to the trans, and t-case. Always twisting against each other, however the case itself acts to hold. All the twisting force and thus transmits no forces to the chassis.
Only two ways to combat twist. One is lower gearing. It takes less torque to move the vehicle. And two solid mount your driveline to itself. Ever see torque twist on an moa crawler?
Sorry for the drawn out response. I spend way to much time thinking sometimes.
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Well I responded without actually reading the post, lesson learned. This is actually something new. My thought is though that all the above still applies. The only time this will make a difference is when front and back wheels are loaded the same. But instead of twisting it may just pop the chassis up to full droop. But in most circumstances you will only be loading up the rear end.
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MasteroFlego
Rock Crawler
I never knew that about corvettes, maybe that could transfer to RC?
BTW, why would you buy this T-case when you can accomplish exactly the same thing by reversing your motor leads?
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Not the same, the two output shafts counter rotate.
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MasteroFlego
Rock Crawler
What I'm saying is this T-case makes the driveshaft rotate opposite to stock, while reversing motor leads makes the driveshaft rotate opposite to stock, without buying a T-case.
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The problem with transferring it to rc is that a corvette has independent rear suspension. Look up "corvette torque tube"
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The only way to eliminate torque twist is to have the motors output(transfer case/center diff/pinion spur)and rear diff solid mounted. Think independent rear suspension(buggy, truggy, monster truck, CHASSIS PLATE).. as soon as you have a solid rear axle you introduce twist. Twist is an effect of haveing suspension between 1 item twisting another. Only way to eliminate torque twist on a bomber is to message the DMG, and order a B2b
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svt923
I wanna be Dave
This is exactly how it works with the counter rotating shaft setup in my Ascender. On flat ground, it is fantastic, there is no noticeable twist because the front and rear cancel each other out. Get into a situation where the majority of the weight is on one end or another, it will twist in the direction with the weight.
DavidH
Quarry Creeper
Yes, or you can simply increase the preload on one side over the other.
84yoda
I wanna be Dave
Or run worm gears.:mrgreen:
svt923
I wanna be Dave
DukeMinnix
Rock Crawler
if utilizing the entire chassis, it would have to sit up so high it would be sickening, shit, you cant even run a decent size servo and a winch plate under the hood without it going crash bang boom.
84yoda
I wanna be Dave
There's a few people that put bully axles under a wraith. Lol.
I'm just gonna leave these here. They helped me a lot and were pretty good reads. Basically what lanky said. Any time the diff isn't connected to the frame, you're gonna have twist. Same goes for front and rear.
http://www.rccrawler.com/forum/showthread.php?t=367502
http://www.rccrawler.com/forum/showthread.php?t=54791
http://www.rccrawler.com/forum/showthread.php?t=367502
http://www.rccrawler.com/forum/showthread.php?t=54791
