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    Have a great season.

    From this point on, all vendors/mfg's promoting Pre-Season tiered sales programs, in the Polaris Forums, that are not paid advertisers will be appropriately moved to the swapmeet section of the forums.

    MH

Mtntk Turbo Axys

tdbaugha

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Hey guys,

Seems like there is a lot of interest in the Mtntk turbo kit for the Axys. 2 buddies and I snowchecked kits this year, so I'm creating this thread to go over the details of the kit, installation, ride videos/reviews, etc.

I've been dreaming about getting a turbo sled since I got my first mountain sled 6 years ago. I think I've read every single turbo thread in both the Arctic Cat and Polaris forums. We ended up going with the Mtntk just based on prior research, what I learned in college, talking with my engineering buddies, and the quality of components that come with the kit. There was essentially nothing out there in the form of videos or reviews on the Axys with this kit but we committed to it anyways. So I've been super anxious to check out what we got!

Our kits just arrived and I took some detailed photos of the components within the kit.

Turbo:

Borg Warner EFR 6258. This thing is trick. Gamma-Ti turbine wheel, ceramic ball bearings, forged milled compressor, integrated blow off recirculation valve, internal wastegate that was designed for high performance gas engines.

http://www.turbos.borgwarner.com/files/pdf/efr_turbo_technical_brief.pdf









This thing will flow some air!

Tunnel Cooler:

Custom extrusion for Mtntk so it fits perfectly in the center of the Pro and Axys tunnels. Nice welds and it's gigantic. Shouldn't have any overheating issues and the charge air should be very cool and consistent!





Intercooler:

Honestly this was the part I was a little worried about. They're using 3D printed throttle body adapters which also house the new injectors. The surface finish on the injector mount is nice and smooth, and Mtntk says they have never had any issues with those. Now that I have them in my hands, they seem pretty stout. The air path and coolant path are two aluminum welded assemblies that are then bonded together with the same adhesive Polaris is using on the chassis. Construction looks sound to me. And then everything else is bolted to the box with what looks like a type of PEM nut pressed into the sheet metal. Nice! Everything is also sealed with a type of gasket maker material as well. My worries are gone now for sure.









Muffler:

Super nice looking muffler. Quite a bit smaller than I anticipated. Pretty light. V Band connection and spring clamp to the chassis. Very nice as well.





Nuts and Bolts:

Everything else is nicely packaged. Comes with new injectors, all the coolant, oil, and reference line hoses. All the zip ties, springs, etc you should need for installation. Bully Dog GT Tuner so no need to send in our ECU's for reflash. We can also use it for diagnostics and datalogging should we have a problem with our machines. 18 pages of instructions. Install looks pretty involved. But that is to be expected with how tight they have this packaged together. The turbo is very centralized in the chassis. Charge tubes are ultra short. Like a couple inches is all. We got our kits sent with clutching to run 9-10 ish lbs boost at 6000'. Clutching is stock secondary, 10-74's with a 180-320 primary spring. We will be experimenting with boost once the snow flies.





All in all so far I'm very impressed. Hard to believe you can get all this stuff for $4000!!!! Even now the price is $4400, which is still a smokin deal considering what you get. We'll see how she performs come December. Cannot wait!
 

himarker

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Thanks for the pictures and details. Hopefully you will be able to do the same for install as well. Looking forward to more of these kits on the snow. I'd love to get one...
 

tdbaugha

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7-8 ish. Mtntk has ran 10 on pump but doesn't recommend it to customers. We're going to be mixing 25% AV and 75% premium at 10 lbs boost.

We took some weights of the components:

Tunnel Cooler = 8.0 lbs
Muffler = 6.8 lbs
Intercooler = 5.0 lbs
Turbo = 18.9 lbs
Boost gauge & mount = 0.5 lbs
Blowhole & Vents = 2.4 lbs
Misc (includes the bags for packaging) = 9.8 lbs

Cooler holds 3.5 lbs of coolant
Intercooler holds 1.3 lbs coolant

Total gain = 56.2 lbs.

We'll be removing the stock can, intake, airbox, coolant reservoir, coolant hoses, foam, etc, etc. We'll weigh that stuff as well. And do a full sled ready to ride before and after weight.
 

Sunvang

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7-8 ish. Mtntk has ran 10 on pump but doesn't recommend it to customers. We're going to be mixing 25% AV and 75% premium at 10 lbs boost.

Im running the same setup as you this coming winter, installed, tuned and ready to go.

Are you running stock compression? How did you come up with the fuel mixture? Im going to mix in AV also, but tought that at 10psi it almost would need to 50/50 AV and premium?
 

tdbaugha

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Im running the same setup as you this coming winter, installed, tuned and ready to go.

Are you running stock compression? How did you come up with the fuel mixture? Im going to mix in AV also, but tought that at 10psi it almost would need to 50/50 AV and premium?
100% stock motor. Keep in mind when I say "10lbs", that is at 6000'. I'm assuming in Norway you're a bit lower than that?

What are you running for clutching?
 

Sunvang

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100% stock motor. Keep in mind when I say "10lbs", that is at 6000'. I'm assuming in Norway you're a bit lower than that?

What are you running for clutching?
Ahh i see. Im going for 10-11psi at around 1500ft to 3500ft, so some lower than you.

Clutching is heel clicker weights, but cant remember the springs and helix. Will post after i check.
 

tdbaugha

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Our builds are just about done now. I created a guide to boost/fuel/altitude for the kit. Keep in mind this is only applicable to MTNTK... The kit comes setup to run pump gas but can be adjusted to anything you want. We will be running various boost levels around the 5000'-7000' elevation range.

 

Sunvang

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Our builds are just about done now. I created a guide to boost/fuel/altitude for the kit. Keep in mind this is only applicable to MTNTK... The kit comes setup to run pump gas but can be adjusted to anything you want. We will be running various boost levels around the 5000'-7000' elevation range.

Nice graph. is this based on real life testing, or just estimated numbers?
 

tdbaugha

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A couple of real life testing numbers that Mtntk gave me. And then highly extrapolated. Especially for low elevation. So take it with a grain of salt.
 

Sunvang

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It would be awsome if they made a graph like that, for the clutch weights also. Like how many grams you need to load each weight, at what boost at what altitude.

Im going for 10psi at 2-4000ft. Thinking i should start at 78grams.
 

Indy_500

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It would be awsome if they made a graph like that, for the clutch weights also. Like how many grams you need to load each weight, at what boost at what altitude.

Im going for 10psi at 2-4000ft. Thinking i should start at 78grams.
10 lbs on an axys at 2k feet? Holy fawk man :face-icon-small-sho
 

Sunvang

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10 lbs on an axys at 2k feet? Holy fawk man :face-icon-small-sho
Shouldnt be a problem when mixing in 50% AV. I rode a Boondocker Pro on 7.4 psi for one season on straight pump gas, then one season with 10.4 psi on straight pump gas but lowered compression to 10.2:1 Only blew one piston :eyebrows:
 

Indy_500

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Shouldnt be a problem when mixing in 50% AV. I rode a Boondocker Pro on 7.4 psi for one season on straight pump gas, then one season with 10.4 psi on straight pump gas but lowered compression to 10.2:1 Only blew one piston :eyebrows:
I could care less if it holds up or not, but just can't wrap my head around what 10 lbs would feel like on an axys at 2k feet :rockon:
 

die hard poo

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I ran 10-12# of boost on my pro at sealevel on 100% av. Straight beast mode! But couldn't keep it consistent running:(
 

Sunvang

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I ran 10-12# of boost on my pro at sealevel on 100% av. Straight beast mode! But couldn't keep it consistent running:(
Was running 100% av gas making it inconsistent, or the tuning at that high boost? What kit and tuning device did you have?
 

die hard poo

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This was a couple years ago on my 14' pro. And it was a silber kit, and it was the tuning at my elevation that made it inconsistent.
 
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