Close Ratio AWD - Difference between my 570 SP vs 570 EPS - Polaris ATV Forum
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post #1 of 21 (permalink) Old 01-07-2016, 11:29 AM Thread Starter
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Close Ratio AWD - Difference between my 570 SP vs 570 EPS

Now that it's winter I've been able to notice another distinct difference between my 2015 570 SP vs 570 EPS, the close-ratio AWD. I notice it while driving around on roads where there's a mix of dry pavement and snow/ice.

The non-SP 570 stutters and jerks a bit as wheel slip occurs and traction is engaged in the front. The 570 SP acts totally different. I feel zero slip/stutter/jerk. It's quite a pronounced difference, and especially noticed when driving uphill. I'm attributing this to the close-ratio awd on the SP where the engagement to the front traction happens faster. My SP has larger tires (26" vs 25") too, so that might have something to do with it.

Anyway... This doesn't change my overall opinion that the 570 EPS is preferable to the SP due to the savings in $$$, the fact that ADC (SP) is almost irrelevant with the 570 EPS' stout engine braking, the better size (12") wheels, and better performance of the EPS (probably due to smaller wheels).
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post #2 of 21 (permalink) Old 01-07-2016, 02:33 PM
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It was a huge difference for me as well. I moved from a 550 to the 2015 850 SP and now the 1000 Touring. The close ratio AWD was something I had to get used to because it works so well. I mean it's pretty much so fast it's engaged right from the moment you press the button. It has a complete different feel in AWD from the old system to me.

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post #3 of 21 (permalink) Old 01-07-2016, 02:56 PM
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Well now, I can think of a few members that would say the old system is the best and you guys suck at riding and neither polaris nor anybody else knows what they're talking about....you know...because you suck at riding and all with original awd system.

(Just a smart ass rant based on countless threads with guys saying they didn't like how the "old" awd system worked and the peanut gallery rushing in to try and degrade them

Obviously polaris tweaked the hillard for the better as evident by your guys experience, that's great news for slick surface riders and future buyers.
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post #4 of 21 (permalink) Old 01-07-2016, 03:03 PM
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I've never noticed my AWD kick in, but I know it's there. maybe it's how I hit the throttle, maybe it's the lack of earth shattering power that the Hawkeye doesn't possess, but I've only ever notices it working when I had to engage it after the back tires stopped working and it wasn't already on.

That being said the CR AWD engages at 4% slippage vs the 20% the standard takes. on a 25" tires the Close ration takes a slip of 3.14" to engage. The standard takes 15.7". or 1/5th of a tire rotation. no way you're going to notice the rear slipping 3" while you're moving. But I can understand noticing 16" especially if you're not going to fast.

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post #5 of 21 (permalink) Old 01-07-2016, 03:40 PM
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I don't "feel" it on my 850. I have to be on a snow-covered hill, or loose dirt; stop, switch on the 4X4 and move, slowly increasing throttle to even notice the front to stasrt driving - no noise or bumps or jerks or anything, it's just there. I think it's a great system.

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post #6 of 21 (permalink) Old 01-07-2016, 04:06 PM
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I never notice mine either, but then again I have not ridden a new machine either.
I notice the bikes have different tires, do you think this has any effect? does either pull harder regardless of smoothness of engagement?


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post #7 of 21 (permalink) Old 01-07-2016, 04:08 PM Thread Starter
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I normally don't notice the difference between machines. But when I'm driving on that dry / patchy stuff - like 70% snowy patches, 30% dry, that's when I feel it. I'm talking about when you're doing a consistent slow speed, not hammering the throttle. Those rear wheels go from pure grip, to big slip as they go over the icy spots.

I would never have thought 20% of the tire rotation will be that noticeable. But as for wheel slippage...Keep in mind the non-SP one I have still has the STOCK Carlisle tires on it which are pure crap on snow/ice unless you run 'em at 3.5psi. I normally don't have my non-SP tires aired down that low because I use my SP for plowing.
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post #8 of 21 (permalink) Old 01-07-2016, 06:15 PM
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My 14 has the old system and I most definately can tell the engagment, made esspecially noticeable when snow plowing, you can feel back tires dig down a bit then feel the slam throughout the bike as the front diff engages.

Then I can definately feel the gearing difference front to rear when maintaining a constant speed on hard pack/slick roads...the rear end gets to wanting to go around the front end. A quick throttle blip fixes it but always that first instance I find myself readying to counter steer....then blip throttle and all is fine for a little bit until it does it again.
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post #9 of 21 (permalink) Old 01-09-2016, 08:28 PM
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Mine is imperceptible too. Glad to know there's something good to the SP besides these darn 14's.


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post #10 of 21 (permalink) Old 01-11-2016, 08:40 AM
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Quote:
Originally Posted by Guilow View Post
, the fact that ADC (SP) is almost irrelevant with the 570 EPS' stout engine braking, .
I determined exactly why the ADC is so much better than the engine braking feature over this past weekend while riding my property with snow and ice on the ground. The ADC does not slip wheels (at least it did not for me). Descending a steep slope with the engine brake had me sideways at times, the snow just piles up under the wheels and once the tread is loaded the machine just skids. This did not happen at all with the ADC - the descent was slower, and completely controlled.

So that for me was further validation of why I chose the SP - the ADC was one of the big factors for me and I am glad I have it now that I have seen it in action in the snow.


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