KOH Revisited (aka testing)

[DV8TED]

KOH Testing Video

So, watched the vids several times and I had a few takeaways.
1. The utv looks very torquey with this engine & clutching package. Seemed like it was very responsive to minor throttle inputs which I really like so long as it isn't too touchy.
2. The drive train looked like it performed well although way too little known at this time. I really liked seeing all the wheels turning at the same time with power being equally distributed while locked. Really like the option to chose a true open or closed front differential.
3. Lower rocker panel. Hard to tell from the current vid/pics, but it appears that the rocker plastic held up pretty well to being bashed numerous times. Was feeling like that may be a vulnerable point. Maybe the thicker skidplate allowed it to endure the abuse. Time will tell...

 

[Nikal]

I actually think the Speed’s low gear might be a bit taller than the others, as I felt they were rev’ing the engine higher than it seems the other do? But maybe that’s not accurate and just the way it looked or sounded to me?

But you will not see me climbing through the rocks.

 

[EdoublE]

When the car was about 2/3rds the way up it paused and looked & sounded like the driver changed gears, however Robby said it was in first for the whole climb. Not sure what I was hearing but it didnt sound great. Guessing it could have been background noise from another vehicle.

 

[DV8TED]

I actually think the Speed’s low gear might be a bit taller than the others, as I felt they were rev’ing the engine higher than it seems the other do? But maybe that’s not accurate and just the way it looked or sounded to me?

But you will not see me climbing through the rocks.

To be honest, I'd be really pleased with a low range between X3 and RZR. However, having X3 gearing and 35's would be perfect for my riding.

 

[PropDr]

When the car was about 2/3rds the way up it paused and looked & sounded like the driver changed gears, however Robby said it was in first for the whole climb. Not sure what I was hearing but it didnt sound great. Guessing it could have been background noise from another vehicle.

One or the other torque limiting clutch may have slipped, or changing from open to locked front diff?
Engaging the front lock without rolling could be hit or miss, more likely miss.

 

[PropDr]

I actually think the Speed’s low gear might be a bit taller than the others, as I felt they were rev’ing the engine higher than it seems the other do? But maybe that’s not accurate and just the way it looked or sounded to me?

But you will not see me climbing through the rocks.

wouldn't higher revving engine indicate lower gearing.

 

[pj_hunt]

wouldn't higher revving engine indicate lower gearing.

He is talking about belt/clutch slipping to get moving under load. I noticed it too.

 

[DV8TED]

wouldn't higher revving engine indicate lower gearing.

With gearing it is the opposite of that. Differential Gear Ratio determines the number of times the drive shaft (or pinion) will rotate for each turn of the wheels (or ring gear). So if you have a 3.73:1 gear ratio the drive shaft turns 3.73 times for every turn of the wheel. Changing tire size affects the final drive ratio. Lower gear ratio, such as a 2.72:1 means the driveline turns 2.72 times to one revolution of the wheels.

Hope that helps.

 

[DV8TED]

He is talking about belt/clutch slipping to get moving under load. I noticed it too.

I went back and watched several more times and I can't say that I heard/seen much in the way of belt slippage. When gassed, the tires appeared to move as they should. When Max initially took off, I don't think he was very aggressive with the throttle plus there seemed to be a little more traction. JMHO.

 

[PropDr]

With gearing it is the opposite of that. Differential Gear Ratio determines the number of times the drive shaft (or pinion) will rotate for each turn of the wheels (or ring gear). So if you have a 3.73:1 gear ratio the drive shaft turns 3.73 times for every turn of the wheel. Changing tire size affects the final drive ratio. Lower gear ratio, such as a 2.72:1 means the driveline turns 2.72 times to one revolution of the wheels.

Hope that helps.

Sorry, I thought he was talking about the transmission; the lower the low gear the higher the engine has to rev to get to the same speed.

 

[Speed Demon]

With gearing it is the opposite of that. Differential Gear Ratio determines the number of times the drive shaft (or pinion) will rotate for each turn of the wheels (or ring gear). So if you have a 3.73:1 gear ratio the drive shaft turns 3.73 times for every turn of the wheel. Changing tire size affects the final drive ratio. Lower gear ratio, such as a 2.72:1 means the driveline turns 2.72 times to one revolution of the wheels.

Hope that helps.

I thought 3.73:1 is 3.73 turns to one revolution of the crankshaft not the wheel

 

[The Dude]

Sorry, I thought he was talking about the transmission; the lower the low gear the higher the engine has to rev to get to the same speed.

I was confused too! Whenever I hear "low gearing" I think of higher revving and slower travel speed with more climbing power. And whenever I hear "high (or tall) gearing, I think of lower revving and faster travel speed with less climbing power. Is that terminology switched around when referring to diff gearing?

 

[PropDr]

I was confused too! Whenever I hear "low gearing" I think of higher revving and slower travel speed with more climbing power. And whenever I hear "high (or tall) gearing, I think of lower revving and faster travel speed with less climbing power. Is that terminology switched around when referring to diff gearing?

Yes, sadly we apply terms and definitions as we see fit for different applications.
But if you strictly talk about gear ratio High and Low is determined by input to output; the more often the input has to turn in relation to the output the higher the ratio.

 

[PropDr]

I thought 3.73:1 is 3.73 turns to one revolution of the crankshaft not the wheel first number input, secon

I thought 3.73:1 is 3.73 turns to one revolution of the crankshaft not the wheel

The first number is the input, the second number the output.
As long as the driving side is tuning faster than the driven side the first number is grater; as in 2:1
If the driving side is turning slower than the driven side the second number will be grater: as in 1:2

 

[Speed Demon]

The first number is the input, the second number the output.
As long as the driving side is tuning faster than the driven side the first number is grater; as in 2:1
If the driving side is turning slower than the driven side the second number will be grater: as in 1:2

Thanks I get it

 

[Nikal]

wouldn't higher revving engine indicate lower gearing.

Not necessarily. Think about a stick shift car. If you put the car in second gear and tried to take off from a dead stop. You would have to rev the engine up allot higher, then if you used first gear to get that vehicle to go and not stall or jerk, because the gearing is much taller in 2nd gear and will require more power from the engine to move the car.

 

[PropDr]

Not necessarily. Think about a stick shift car. If you put the car in second gear and tried to take off from a dead stop. You would have to rev the engine up allot higher, then if you used first gear to get that vehicle to go and not stall or jerk, because the gearing is much taller in 2nd gear and will require more power from the engine to move the car.

Ok, I can smell that clutch...

 

[Nikal]

Ok, I can smell that clutch...

But in the case of the UTV it would not be slipping the clutch like a car. It just needs a higher rev to engage clutch and to pull the taller,1st gear.

I’ve heard some say the Can Am has a taller low gear vs Polaris, and that’s why the Polaris and especially the Kawi KRX crawls over the rocks better than a Can Am.

 

[DV8TED]

But in the case of the UTV it would not be slipping the clutch like a car. It just needs a higher rev to engage clutch and to pull the taller,1st gear.

I’ve heard some say the Can Am has a taller low gear vs Polaris, and that’s why the Polaris and especially the Kawi KRX crawls over the rocks better than a Can Am.

I haven't driven any of the new RZRs, but I have driven several X3s and their low range is definitely a taller ratio. Goes slower so much better than my RZR. With that being said, in the X3, it took me forever to quit giving myself whiplash when in low and reverse (very touchy).

 

[PropDr]

I haven't driven any of the new RZRs, but I have driven several X3s and their low range is definitely a taller ratio. Goes slower so much better than my RZR. With that being said, in the X3, it took me forever to quit giving myself whiplash when in low and reverse (very touchy).

I wonder if the RC uses a different gear ratio compared to the other X3 Turbo Rs.
Over rocks, the RC does really well.