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4x4 on demand / 4x4 on command ?

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#61 ·
RZR_Joe said:
I give up trying on this one, time for a cup of ☕ and go back to tinkering
Click to expand...
Oh come on, don't give up, I may be stubborn sometimes, but I feel I have a pretty good grasp on how this AWD system works. Please tell me where I am wrong, and or, expand more on technique for navigating down a long, steep, slippery hill. I was never scared to do so with my '74 Bronco, but this machine scares me on the steep descents.
 
#62 · (Edited)
Just some ideas. 1) You could descend steep hills with one foot On the brake and one lightly on the gas to cancel the engine braking. This is what I do. 2) you can start from a very low speed so the the clutch has not engaged, and descend on the brakes 3) momentarily lock the wheels with the brake to disengage the clutch and descent with the brakes alone.
 
#63 ·
Patriotrider said:
if you put the transmission in neutral, but x-case is in 4WD, the front end and back end will be locked together. This has nothing to do with locking differentials.
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But having lockers frt & rear down that hill does mean the poster was correct, you could not lock up just the front or rear axle with the brakes....you could have only one caliper on the whole Jeep and hitting that one brake will lock up the other 3 wheels thru the drive train....
The present AWD/4WD Polaris front diff works really well in almost every situation, but not EVERY situation...So to the OP who has a valid complaint in those narrow uses, short of offering two different frt diffs the vast majority of owners Polaris did their best, and offering two different diffs would 1) Cost more to develop and build, 2) how many would they really sell? Price does matter, people complain about these car costing too much now...
 
#64 ·
SteveH87 said:
Just some ideas. 1) You could descent steep hills with one foot On the brake and one lightly on the gas to cancel the engine braking. This is what I do. 2) you can start from a very low speed so the the clutch has not engaged, and descend on the brakes 3) momentarily lock the wheels with the brake to disengage the clutch and descent with the brakes alone.
Click to expand...
Bingo we have a winner!!!!!
 
#65 ·
SteveH87 said:
Just some ideas. 1) You could descent steep hills with one foot On the brake and one lightly on the gas to cancel the engine braking. This is what I do. 2) you can start from a very low speed so the the clutch has not engaged, and descend on the brakes 3) momentarily lock the wheels with the brake to disengage the clutch and descent with the brakes alone.
Click to expand...
What did I miss?......since the S doesn't have engine braking why does the above make sense?
 
#66 ·
RZR_Joe said:
Bingo we have a winner!!!!!
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#2 is my issue. (No, not that #2 :) When using the brakes only, down a steep hill, the back wheels will stop rotating while the front continue to rotate, because the AWD system has disengaged itself automatically. This causes the back end to step out. Then I have to let off the brake to straighten the rig back out, but then the rig picks up speed right at the worst times. The only way of combatting this, aside from a different AWD design, is to have a manually adjustable-on-the-fly brake proportioning valve to add more brake bias to the front brakes when descending these steep hills. (Or, a sophisticated ABS system.)
 
#67 ·
Patriotrider said:
When using the brakes only, down a steep hill, the back wheels will stop rotating while the front continue to rotate, because the AWD system has disengaged itself automatically. This causes the back end to step out. Then I have to let off the brake to straighten the rig back out, but then the rig picks up speed right at the worst times. The only way of combatting this, aside from a different AWD design, is to have a manually adjustable-on-the-fly brake proportioning valve to add more brake bias to the front brakes when descending these steep hills. (Or, a sophisticated ABS system.)
Click to expand...
Well all that makes sense....a lot of newer trucks have some sort of hill decent, that would be a possible way for Polaris to go...
 
#68 · (Edited)
xr650lou said:
Well all that makes sense....a lot of newer trucks have some sort of hill decent, that would be a possible way for Polaris to go...
Click to expand...

Yes they do, it's called engine braking and some have exhaust braking. My F350 DRW has both, it will downshift and use the engine to slow down on steep descents. Same concept as the RZR uses for engine braking. This is without the exhaust brake, that is different all together.

Patriotrider said:
#2 is my issue. (No, not that #2 :) When using the brakes only, down a steep hill, the back wheels will stop rotating while the front continue to rotate, because the AWD system has disengaged itself automatically. This causes the back end to step out. Then I have to let off the brake to straighten the rig back out, but then the rig picks up speed right at the worst times. The only way of combatting this, aside from a different AWD design, is to have a manually adjustable-on-the-fly brake proportioning valve to add more brake bias to the front brakes when descending these steep hills. (Or, a sophisticated ABS system.)
Click to expand...
The RZR uses a single reservoir for front and rear brake lines so the same pressure is applied to all four corners. Sounds like you need to adjust your brakes, the rear should not lockup before the front.

Edit: Brake bias is built into the caliper clamping, that's why the front has larger calipers and pads.


I think original topic is being confused with other issues.
 
#69 ·
RZR_Joe said:
Same concept as the RZR uses for engine braking. This is without the exhaust brake, that is different all together.
Click to expand...
What engine braking does our S models have.....I'm not aware of any....
Yes you can build in brake bias using several methods, surface area of frt vs rear pads and also clamping force by different caliper piston sizes...not uncomen for road race cars to have a driver accessible proportioning valve located inline to the rear brakes to cut pressure as needed...
 
#70 ·
xr650lou said:
What engine braking does our S models have.....I'm not aware of any....
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Did not say it did.

xr650lou said:
Yes you can build in brake bias using several methods, surface area of frt vs rear pads and also clamping force by different caliper piston sizes.
Click to expand...
I think I said that above...


Going no where fast, I tied to explain it but I must be doing a crappy job....enjoy guys.
 
#72 ·
Wheeew !! How did I miss this thread? It’s a doozie 😂.

The only time I’ve ever seen immediate all 4 wheel drive at the flip of a switch, is the time I put a XP 1000 diff in my 800- by golly, hit the switch and the front was locked in!! Never mind the fact that it was dragging the rear along because of the slightly taller gear ratio- 🤦🏻‍♂️. Lol

Sometimes the “know it alls” really do know a thing or two .. people need to learn to listen sometimes.
 
#73 ·
The standard RZR clutch does have engine braking, just not as much as the EBS, and it kicks out at low speed because it has a two way bearing in the primary clutch.

Polaris also has a front Hilliard differential that provides 4 wheel engine braking that is only available in the Ranger Back Country models. It is called ADC, Automatic Descent Control.
 
#74 ·
The only time I’ve ever seen immediate all 4 wheel drive at the flip of a switch, is the time I put a XP 1000 diff in my 800- by golly, hit the switch and the front was locked in!! Never mind the fact that it was dragging the rear along because of the slightly taller gear ratio- 🤦🏻‍♂️. Lol

Sometimes the “know it alls” really do know a thing or two .. people need to learn to listen sometimes.
Click to expand...
But it doesn't hold you back going down hill.
 
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Makb183
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