attention Shafties, tranny setup

[toy4crawlin]

Any of you Comp guys or bashers prefer to have the Center diff trans setup

With a center diff you only loose front or rear drive Not both at the same time , isn't that better..?
Example: let's say one of the rear wheels becomes stuck and cannot turn but the motor can still turn the Front Wheels ?

Or
Do you like the Slipper to Slip entirely so if any of the 4 wheels cannot turn all power is lost and slips into the slipper, thus saving from breaking axles?

I'm thinking the first way is best.

Or am I just a newb and there's no reason and no Worry about overheating your ESC or motor if for that 2 sec the wheels cannot turn with power applied?

also where is info to figure out gear ratio's ?
and what ratios are best?

thanks

Here's the Tranny I'm thinkin of using

[dieselfuel]

I run an r2 trans, no slipper, fully locked. Ive never run a slipper at all.

[Mechanicalbob]

Originally Posted by toy4crawlin

Any of you ( Pro's or Comp guys, or bashers prefer to have the trans setup so that if let's say one of the rear wheels becomes stuck and cannot turn but the motor still turns the Front Wheels ?

Or Do you like the Slipper to Slip entirely so if any of the 4 wheels cannot turn all power is lost and slips into the slipper, thus saving from breaking axles?

I'm thinking the first way is best.

also where is info to figure out gear ratio's ?
and what ratios are best?

thanks

Well I like to have power to all four wheels. I have a "slipper" on the spur gear for when things get a little stickey. On my basher I have the front and rear diffs locked. If I wanted to transfer power from the front to back when somthing got stuck I would need to put in a center diff.

As for the gear ratios the best way to get them is take the spur gear (the larger gear) and devide it by the smaller gear (the clutch bell, or the pinion gear). For example 82t spur with a 16t clutch bell will get you a 5.125:1 ratio. That would be your input gear ratio to your tranny. Then there is the tranny ratio and the diff ratio. So lets say that your tranny has a 3:1 ratio. take your input gearing of 5.125 and multiply it by the tranny gearing, (5.125x3) and you will have a gear ratio of 15.375:1 for the tranny output. Then take your diff ratio and multiply it by the tranny out put and you will have your final ratio. So if you have a diff ratio of 2.81 your final ratio would be 43.20:1. Also the tire size will be a factor as to how fast or slow your rig will go.

As for what ratios are best it depends on what you are running, where you are running and the speed you would like to have. There are a lot of options to be had.


Steve

[toy4crawlin]

Bob thank you for the gear ratio stuff

My main question here is which slipper style do people Like ?

If a Wheel becomes Stuck
Slip one axle only
Or
Slip all four wheels

[jsudar]

I run a brushless set up and I like to have a slipper. I keep it pretty tight, but it's nice to have a fuse in the drive train. It's a lot easier to change out a shredded spur gear than to rebuild a tranny or what ever else. Some guys like to have a driveshaft as the weak link cause those are easy to change too. I wouldn't use a slipper to disengage the rear drive, just the motor. I want all four tires turning.

[WheelChair]

I for one care for only two modes:

LOCKED SOLID front and rear.

or
FRONT DIG rear locked (or not locked)

Building a tranny with a center diff does not make sense in a rock crawler. Or center slippers.
Not unless you had POWERFUL brakes on the outputs.

Even then... It would suck.

Damn, I need to get friction dig going!!!!!!

[toy4crawlin]

Originally Posted by WheelChair

I for one care for only two modes:

LOCKED SOLID front and rear.

or
FRONT DIG rear locked (or not locked)

Building a tranny with a center diff does not make sense in a rock crawler. Or center slippers.
Not unless you had POWERFUL brakes on the outputs.

Even then... It would suck.

Damn, I need to get friction dig going!!!!!!

If you say center diffs suck why is it worse than a regular slipper

With center diff you only loose front or rear drive Not both at the same time , isn't that better..

[WheelChair]

Not only do you loose power where the traction is.....

But if the rear is stuck then that means your front will spin at twice the speed.

Not crawler friendly...IMO.

[sloppy]

yeah a center diff will do you no good at all. a slipper is a good idea if you are new or have a heavy trigger finger. but the slipper is for the motor it will let the motor spin free if you get to bound up.
having the front or rear tires spinning while the others have all the traction will not hel[p you at all on the rocks

[toy4crawlin]

Yea I understand the chances of the front turning,

huh very interesting

Any body else have expeirence on this ?


thanks

[balang_479]

with a center diff you may have the advantage in the situation that you are describing, but in every other situation when you are crawling normal it would be a big disadvantage... the front would continuously be slipping on steep climbs and downhill youll have the front wheels touching and the rears maybe not (or simply less traction) causing them to rotate in a reverse direction loosing breaking power... diffs are not good for crawling, racing yes.... they just complicate things and simply hurt performance when simply crawling.....


as soon as there is a change in weight distribution from front to back the diff will move causing inconsistent traction. youll simply loose power where you need it.

[Grizzly4x4]

It's just like an open differential, whichever axle has no traction will get all of the power.

[toy4crawlin]

Originally Posted by Grizzly4x4

It's just like an open differential, whichever axle has no traction will get all of the power.

Actually I adjusted the Diff so tight
that is really does not act like that

Front and Back move ,
I put my tranny in a vise and clamped the output shaft while turning the Drive Spur, it wanted to turn the whole tranny but if held very tight I could hold tranny in place while getting the spur to turn the Other output shaft.

Seems near Locked to me
I could always remove the balls for no slipage

[Grizzly4x4]

Originally Posted by toy4crawlin

Actually I adjusted the Diff so tight
that is really does not act like that

Front and Back move ,
I put my tranny in a vise and clamped the output shaft while turning the Drive Spur, it wanted to turn the whole tranny but if held very tight I could hold tranny in place while getting the spur to turn the Other output shaft.

Seems near Locked to me
I could always remove the balls for no slipage

Oh, I didn't know you had a ball diff tranny. Yeah, an adjustable ball diff could possibly be made to work, for a while.

When I built a crawler out of a touring car I tried cranking down on the ball diff to lock it. It still slipped too much and loosened over time until one time I was re-tightening it and the diff broke.

I still say give me a locked tranny with a spur slipper or dual trannies.

[Tanis]

Originally Posted by toy4crawlin

Actually I adjusted the Diff so tight
that is really does not act like that

I tried that when I first built my crawler, and then I bought a pede tranny and locked it up. Made a world of difference in performance on the rocks.
X2 on what Grizz said, I'll take true 4wd anyday.

[toy4crawlin]

Originally Posted by Tanis

I tried that when I first built my crawler, and then I bought a pede tranny and locked it up. Made a world of difference in performance on the rocks.
X2 on what Grizz said, I'll take true 4wd anyday.

What tranny did you try tightening up the center diff ?

I think all center diff trannies will act differently

Again, I clamped one out put shaft and put a ton of force to turn the Spur inorder to get the 2nd output shaft to turn.

I'm going to try it, I'm going to the Rubicon in a Month that be some good testing ground !

pic of tranny again

[Tanis]

I tried it with the stock TLT tranny, it worked OK, but I prefer true 4wd all the time. I don't even run a slipper anymore, I have changed to R2 trannies. Don't let my opinion stop you from trying something out. It might just work for what you want it to do, just stating it doesn't work for what I want it to do.

[toy4crawlin]

Thank you Tanis

Yep What might not work for one may work for another.
Like Kamikaze (re working the super), He says he DOes not like the feel of Brushless motor.

I'm going to mount & try this MIP tranny in and check it out.


My next comparison:
AX10 TRanny or a Modified Stampede tranny

[Grizzly4x4]

Originally Posted by toy4crawlin

Thank you Tanis

Yep What might not work for one may work for another.
Like Kamikaze (re working the super), He says he DOes not like the feel of Brushless motor.

I'm going to mount & try this MIP tranny in and check it out.


My next comparison:
AX10 TRanny or a Modified Stampede tranny

Exactly, you asked our opinions, take them for what they are worth but in the end don't let it stop you from trying something.

[toy4crawlin]

Originally Posted by Grizzly4x4

Exactly, you asked our opinions, take them for what they are worth but in the end don't let it stop you from trying something.

thank you griz
I'm learning.
sorry if I seem a bit weird ,