Why do you think Polaris improved the 800 HO motor?

[LBZ]

Where? The reason I ask is because not many places are accessable in BC above 8000. Boulder has some but not much. And that being said if you are spending that much time above 6500 would you not be more efficient and effective with clutching and gearing for higher elevations.

Pemberton/whistler areas have a fair bit around 8000+ and some LONG climbs at that elevation.

 

[tex78]

I have not told many ppl this either but my t-pro very seldom gets hot on the trail. I only ever use one scratcher and have a 2.8 track. Only thing I think that makes the sled run cool is I have a boost-it water to air cooler and I thing the two coolers are close enough that the air cooler keeps the engine coolers cold.

Boost also runs cool in mid range for egts, cause it's mapped way fatter and the engine temp follows that... Stock are hot and lean in the mid range for emissions

 

[takethebounce]

As a Polaris dealer with over 100 Axys RMK’s sold and even more serviced I’d seriously beg to differ. We have seen 2 engine failures since the launch of Axys, one the tip of a piston ring broke off on a rental unit. Not good but in the world of high output engines it does happen from time to time. The 2nd the customer had the high elevation no start issue that triggered a re flash of the 2016 RMK’s and inadvertently pulled the harness from the oil pump looking for reasons of no start. Again a manufacturer issue but this one lead to human error magnifying the problem. I’d call this a 1.5% failure rate.

Polaris has an incredible mountain sled now that is designed for quick acceleration and precise handling. It is the best technical mountain snowmobile in the busnines and finally one of the most reliable. If you want to drag race up the sugar bowl in a straight line an 850 or ascender may get the edge but one is unproven and the other way outside of the 1.5% failure rate in 2017, neither platform can do what Axys can do.

I for for one would hate for Polaris to push out an unreliable factory turbo or bigger bore engine to keep up with the keyboard/cabin worriers, when the current machine is as good as it is. If they can crank things up and maintain the reliability they’ve had with the Axys then sign me up!

Great to see a dealers perspective.

But I am not talking about failure, more so longevity. These motors still have a short life expectancy compared to other manufacturers. You do not have to sell me on the Axys, I love them.

The HO still has its short comings. They changed the port timing again for these motors and they are making less compression now than they have in several iterations of this platform. The clean fire has cooling and lubrication issues when pushed hard.

Not everyone experiences this and I too believe they perform well but there is still room for improvement. I could easily run a turbo for the amount of money I spend on my sleds but it’s not my thing. Stock performance/reliability is good. I would like to see it just a bit better.

My belief is if they punched out the existing design to gain a 850 it would be a disaster. They should start fresh if that’s their intent and I will stand by that until proven otherwise.

 

[ABMax24]

Boost also runs cool in mid range for egts, cause it's mapped way fatter and the engine temp follows that... Stock are hot and lean in the mid range for emissions

My Wideband O2 rarely reads lower than 14.5:1 on the trail and often over 15:1, my pro runs extremely lean on the trail and has done so since the turbo was installed, of course get on the fuel a little and it quickly richens up and dives under 13:1 on the gauge.

 

[tex78]

My Wideband O2 rarely reads lower than 14.5:1 on the trail and often over 15:1, my pro runs extremely lean on the trail and has done so since the turbo was installed, of course get on the fuel a little and it quickly richens up and dives under 13:1 on the gauge.

Did you have 02 sensor installed with it stock, bet it would scare you


I know they are 1250 egt ish stock in mid, scary stuff

 

[dabensmiller]

Better suspension from the factory would be my #1 choice before any power/displacement increase. I had the factory clickers revalved, it did improve the ride quality, but there is a lot to be desired.

 

[ABMax24]

Did you have 02 sensor installed with it stock, bet it would scare you


I know they are 1250 egt ish stock in mid, scary stuff

No I didn't, but there is very noticible point where the fuel controller begins to add fuel, because the AR ratios go from 15~ish to under 14.

 

[tex78]

No I didn't, but there is very noticible point where the fuel controller begins to add fuel, because the AR ratios go from 15~ish to under 14.

So I bet it's in stock mapping till it gets boost signal from map sensor, then adds fuel

 

[ABMax24]

So I bet it's in stock mapping till it gets boost signal from map sensor, then adds fuel

To the best of my knowledge that is the case.

 

[borsky]

get a BD fuel box and remap, no more lean conditions and more power.