Boosting my Snowmobile (pic heavy)

adairusmc

Diamond Member
Jul 24, 2006
7,095
78
91
amdhunter asked that I posted some pictures of this build here in the garage, after mentioning I bought a turbo kit for one of my snowmobiles back in September. Finally got around to installing it this weekend, so far everything seems to work well. I cannot wait to get it out on the snow to do some real testing with it.

The sled is a 2011 Yamaha Nytro MTX 162SE. The Tubo kit is an MPI 180hp turbo kit, but with my sleds ECU update and boost controller, and the clutching work I did, I should be able to get this up to 12lbs of boost no problem, on premium pump fuel. Should work out to around 240-260hp with the new ECU software.

Anyways, here are the pics. Sorry if some of them are crappy, they were taken with my iphone, and some of the steps I missed taking a picture of. -


This first one is after getting through all of the preparation, removing everything we need to, so we can start adding all of the fun stuff.
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After getting the throttle body removed and modified, I got it put back in and got the airbox installed for it.
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The turbo itself, with the new muffler. Putting it up there to measure where the O2 sensor needs to go for my air/fuel gauge, making sure it will clear the heat shield.
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Got the o2 sensor installed, and the charge tube mostly installed. At this point we were pumping compressed air through the intake, and spraying soapy water out of a spray bottle at all the connections, looking for air leaks and tightening accordingly.
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Got the charge tube installed and leak tested, and the handlebars and headlight put back on. The little cable hanging down by the belt is the controller for everything, eventually going to mount it on the gray bracket above the charge tube.
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I should have taken more pics, but this all told took about 15 hours over 2 days to get done. I did a lot of clutch work that I forgot to take pics of, tons of wiring, etc. Here are some completed pics of the sled put back together, with where my gauges are. I painted the gauge cups red so they would match the rest of the sled.

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Here is the new air intake for the turbo, with filter and prefilter instaled. Eventually I am going to make this come up like a snorkel, as it sits too low for me and interferes with my rails on the tunnel, where I store my extra gas when riding.

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Here is where I put the boost controller, a hallman pro rx.

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Right now I have the waistgate rod set to the factory setting of about 4lbs, and the controller lets me add up to 5lbs more. Once I get this on the snow to do some real testing, I plan to adjust that waistegate rod so I can add the rest of what this setup should be able to do.

There have been a lot of other mods to this sled I have done before this one, but this is the first turbo kit I have installed myself. In case anyone is curious, the rest of the mods I have done to this sled are -

Roest aluminum skid plate
Skinz Airframes running boards
Skinz Rear Bumper
Skinz Front Bumper
Antigravity lightweight battery
Steering post relocate (pushed forward, makes it easier to lay the sled on its side)
Roll-Over valve with tether
Hyperfax sliders
 

Zivic

Diamond Member
Nov 25, 2002
3,505
38
91
awesome!... that motor will hold that much power? no internal work?
 

adairusmc

Diamond Member
Jul 24, 2006
7,095
78
91
awesome!... that motor will hold that much power? no internal work?

We added a head shim to the engine (well, my uncle did, who is much better at that stuff than I), but it still is running the stock pistons and everything. If you are running more boost, then you start having to upgrade some of the internals, and do much more clutching work.

The dealer where I get all my parts specializes in boosted yamaha four stroke snowmobiles, and they have made some custom sleds running 20lbs of boost doing 400hp+, and they warranty them. Yamaha will honor the warranty on that motor with up to 20lbs of boost (but mine it out of its 1 year warranty anyway). Those sleds run race gas, but the 17lb boost kits (330hp or so) run a 50/50 mix of race gas and pump premium. Not sure I need to go that far though, this thing will be a beast at 12lbs of boost.

This isnt my video, but these are turbo sleds going up the "Monster" chute up in canada, same type of riding I do around here (but not as awesome as that area, I am limited by Oregon mountains). - http://www.youtube.com/watch?v=2B9USkvPWeI&feature=related
 

exar333

Diamond Member
Feb 7, 2004
8,518
8
91
We added a head shim to the engine (well, my uncle did, who is much better at that stuff than I), but it still is running the stock pistons and everything. If you are running more boost, then you start having to upgrade some of the internals, and do much more clutching work.

The dealer where I get all my parts specializes in boosted yamaha four stroke snowmobiles, and they have made some custom sleds running 20lbs of boost doing 400hp+, and they warranty them. Yamaha will honor the warranty on that motor with up to 20lbs of boost (but mine it out of its 1 year warranty anyway). Those sleds run race gas, but the 17lb boost kits (330hp or so) run a 50/50 mix of race gas and pump premium. Not sure I need to go that far though, this thing will be a beast at 12lbs of boost.

This isnt my video, but these are turbo sleds going up the "Monster" chute up in canada, same type of riding I do around here (but not as awesome as that area, I am limited by Oregon mountains). - http://www.youtube.com/watch?v=2B9USkvPWeI&feature=related

:eek:

Awesome performance but that's gotta get expensive! Plus, it can be tough to find premium >91 in lots of more rural areas up here. Race gas, forget it, unless you stay around your own supply.

Awesome setup!
 

slag

Lifer
Dec 14, 2000
10,473
81
101
We added a head shim to the engine (well, my uncle did, who is much better at that stuff than I), but it still is running the stock pistons and everything. If you are running more boost, then you start having to upgrade some of the internals, and do much more clutching work.

The dealer where I get all my parts specializes in boosted yamaha four stroke snowmobiles, and they have made some custom sleds running 20lbs of boost doing 400hp+, and they warranty them. Yamaha will honor the warranty on that motor with up to 20lbs of boost (but mine it out of its 1 year warranty anyway). Those sleds run race gas, but the 17lb boost kits (330hp or so) run a 50/50 mix of race gas and pump premium. Not sure I need to go that far though, this thing will be a beast at 12lbs of boost.

This isnt my video, but these are turbo sleds going up the "Monster" chute up in canada, same type of riding I do around here (but not as awesome as that area, I am limited by Oregon mountains). - http://www.youtube.com/watch?v=2B9USkvPWeI&feature=related

How can you have a 2011 ski and be a year out of warranty?
 

slag

Lifer
Dec 14, 2000
10,473
81
101
wow, they really stand behind their product. I'm surprised it doesn't come with at least a 3 year 1000 hour warranty.
 

adairusmc

Diamond Member
Jul 24, 2006
7,095
78
91
wow, they really stand behind their product. I'm surprised it doesn't come with at least a 3 year 1000 hour warranty.

Have you ver seen what people do to snowmobiles? Getting them stuck in creek bottoms, shredding the drivers with river rock. Hitting trees, not using ice scratchers and ruining their rails, racing across lakes in summer, etc. I am not surprised that they don't give a longer standard warranty. With the kind of abuse that most snowmobiles will go through, any warranty issues should manifest themselves in the first year. You can definitely buy extended warranties though, but I did not.

Ski-Doo, Polaris, and Arctic Cat all offer the standard 1year warranty as well, with the option to buy extended warranties.
 
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adairusmc

Diamond Member
Jul 24, 2006
7,095
78
91
Ask the Canadians in Florida :awe:


OP I hope you are running on open plains. Turbo sleds do not like trees.

Nope, mountain riding for me, and some trees - but in DEEP snow. Definitely no flatland riding for me. Turbo sleds run in trees just fine, you just have to avoid hitting them. Supercharged sleds are a little scarier in the trees for me, I demo'd one last year and since it is always making boost, on the low end it is a bit scary to play around where there are rocks or trees. With this kit and the clutching I am using I am not going to be making boost until about 8300RPM-8900RPM, so it is best for climbing and longer pulls like I prefer to do. Better fuel economy on the turbo kits as well.