N/A mod mountain viper?

[TGM]

Hey I am new here. I do not own a sled, I currently rent when I go to the mountains.
but I am looking at buying a viper mtx. I am wondering if anybody has gone the N/A route instead of a turbo for the mountains. I know you do not get the same power but I like the idea of the longevity of the 4 stroke. any info would be appreciated.
was thinking about an intake mod, with header, muffler and an ecu tune from evolution.

 

[stingray719]

That would do it. I did two mod N/A Vipers and then went turbo on both. From 0 to 30 mph I find no difference in power or speed as you can only put so much power down without track spin. If you are a boondock type rider a turbo really is not going to do what you need. If you are a steep hillclimber the turbo is def the way to go.

 

[TGM]

cool. thanks for the input. I ride in the trees mostly, not really into the hill climbing. I rent ski doos when I do go, but not too thrilled about how much they cost for the life you get out of the engine.

 

[Mountaintech]

If you are going to take a NA Viper to the mountains (I'm assuming Western Alberta, BC ) you'll be wishing you had a turbo real soon.

 

[feeze]

I rode a n/a Nytro MTX 162 for the past 4 seasons. I like to ride trees. Snow checked a Viper MTX 153 3" MPI 180 this year. Just got back from Revy...... Now I love to ride trees[emoji106]... Nice to have that extra HP when needed.


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[yukon yamaha]

With all the new programs from Yamaha there is no real need to built a NA viper and spend way too much $$$$ to get close to 180 hp when Yamaha can supply a mpi turbo and clutching...... If I was to do it all over again I would go down the boost road ......again! The only think that would pull me away from a turbo would be a small super charger kit......

 

[Field Boss]

Just got back from Blue river , BC lots of fresh snow the turbo is the only way to go. In the trees & on the hills, you just have more track speed with the turbo & keeps you on top of the snow. Was fun out climbing my son all day everyday with his 800 pro rmk.
The only problem I'm having is oil loss out the intake when I roll it over from being stuck. It has the roll over update so I'm hoping it's just a poor valve. It worked good for the first 2 days than started acting up the third day.

 

[4StrokeAddict]

I'm not a mountain guy, but I'm going to drop my .2 anyway. N/A sled is going to loose power with altitude which is why Turbos are so popular out west. The turbo looses minimal power since it is forced induction, altitude compensated (MPI anyway). Additionally, by the time you pay for all the little upgrades to get yourself to 160-170HP, you could have bought a turbo that gets you to 180HP. I originally was looking at doing the N/A route but couldn't make the numbers work. Only thing that would change my mind is the weak rods of the updated 2016 engine which has people questioning how much boost if any is safe. A 2014-2015 viper wouldn't make me think twice.

 

[loudelectronics]

I was in your boat as well. Wanted a NA machine to keep weight down and one less thing to worry about. I once thought turbos were just for mountain jumpers and shoot climbers. Boy was I wrong. I like the Trees and boon docking. Although the turbo may not help you in a side hill, it does help you when you need to turn up hill or when in a bind and need more track speed to keep you from getting stuck. In fact they really do not add that much weight considering you are removing a heavy airbox and exhaust. Once you add in the track speed you pick up and consistent HP at any elevation. Its just a win.

 

[TGM]

I like the power that the turbo offers. Just a little worried about the throttle response in the tight stuff. That's why I was thinking about n/a. Need to find a turbo to try in the mountains. Ran into the Yamaha power tour 2014 in west Yellowstone, but they wouldn't let our group touch the sled, even if we showed them the deep stuff. Had about 10 turbo vipers.

 

[loudelectronics]

Throttle response is right on with the 190 kits. I have the MCX and there is no lag that is noticeable.

 

[JustBoostIt]

Well I will be able to ask your question shortly TGM. Being the Evo distributor for the West in Canada I run their shimless ball bearing turbo kit (starting last year) and added on the ecu reflash this year. That puts it in the 290 range with stock compression on 100. Pretty great. I've rode 300+ Apexs and 1100 Cats for 7 years and it is the most responsive 4s turbo I've ever been on. I am currently building a m7000 153 I've named the 30-30 project. Doing a 30hp upgrade with the Evo header, bullet exhaust, a custom intake, and the Evo Stage 4 reflash. I've done a Mountain fit hood with the intake plenum, lithium battery, and with the exhaust and other knick knacks will have dropped better than 30lbs. Looking forward to seeing what that is like compared to 800s more than anything. All parts are around $3500 and its all bolt on DIY for most part other than the hood.

 

[Deeppow16]

I don't have viper I got a nytro. After spending around $1000 my sled is now 30 lbs lighter and makes about 150+hp. Take it to the mountains all the time and It works great for what I do which is mostly tree riding so having a turbo lag would not help me much. If I need to go up a steep hill you just need to take it at angles and you'll be just fine. I'm a college kid so I cant drop $3500 on turbo setup at the moment.

 

[4StrokeAddict]

I have yet to hear of an MPI viper guy say they could detect any turbo lag. The turbo is so close to the engine that it is instantaneous. This has so much torque on the bottom end with this motor, you don't really need the turbo until it gets moving a bit anyway. Many turbo guys are adding taller gears to improve launch control and gain top end...

 

[Deeppow16]

Like I said I have a nytro and they put the turbos under seat so there was some lag there. My bad I didn't realize the turbo was so close to the intake on the vipers.