what does it need to stay cool

[dirk_03]

I am working on my yamadoo. I am going to try to not run the front cooler on the sled. So I guess my question is what does the turboed motor really need for cooling. I have a cooler that is the full length of the 162 tunnel. Should I think about picking up a apex radiator too and running tha? I want to be safe, but I am trying to have a very clean install as well. Hopefully someone can shed some light on this.

 

[kinger]

I guess the only thing you could do is add up the surface area of turbo mountain sleds that dont have a issue and shoot for that. My guess is your fine without the rad/fan when your in good snow hard to say what it will do if you have to run a long stretch of poor snow.

A full length tunnel cooler is what MPI sells to remove the radiator on thier supercharged nytros, if you could compare that size to yours it would be a good gauge.

 

[dirk_03]

MPI

I have about the same amount of cooler as MPI is selling. Are they using the front cooler still though? or does the MTX nytro not have a front cooler?

 

[1CrazySledder]

I don't know bro. My fan kicked on all the time in marginal snow. I was only running 7lbs of boost. I also had custom rear cooler build that took up the entire underside of my 144 extension on my attak. If it were me, I would figure a way to put the small rad. and fan in there just as a safety net. With the rear cooler, side and front coolers and the rad. and fan, my temps still sometimes rised pretty high to the point where I've had jump off trail to cool it. With that and your longer tunnel cooler, you should be ok. I would keep your front cooler also if you can. You can never have to much. Especially in marginal/hard packed trails.

 

[kinger]

Quite a bit different on a mountain sled though. I dont think he'll be taking a 162 with 300+ hp on the trails with a 2.5" track for very long period of time.

 

[**sj**]

I agree with the apex rad and a switched fan...you watch your temp guage and turn the fan on or better yet thermostat controlled....cuz low snow trails or steep and deep powder can both build the heat...

 

[mulot30th]

good tunnel coolers...


and keep that front cooler.


you'll never ever overheat in the mountain.

 

[FLYBYU]

On our turboed Apex's we just run the cooler across the back and use a temp guage. They get hot fast really no matter what you do. They get even hotter faster when you start adding timing also.

 

[**sj**]

On our turboed Apex's we just run the cooler across the back and use a temp guage. They get hot fast really no matter what you do. They get even hotter faster when you start adding timing also.

what about on a turbo nytro smeone really needs to figure out a rear mouont cooler on the xtx

 

[dirk_03]

cooling

Sounds like I need to have the additional coolers. I am not at all worried about riding in the mountains. Maybe the trails in the mountains sometimes are packed, low snow, etc. I also like to ride once in a while in minnesota, I prefer ditch banging with occasional trail riding. So I need to rework the front cooler or add a small rad with a thermo controlled fan.

 

[t_thall]

i removed the rad on my t-nytro. I am sstill running the stock front cooler and i added a tunnel cooler i had from a 01 summit 151. I run a 121 and a 162 and it works great, the only time it will get hot is if it idles for a long time.

 

[t_thall]

i am running 15 psi at 1000 feet

 

[Ski-Dooin' it]

How bout I answer for almost hte exact sled??

the RT has the full length tunnel cooler, then the rear one you can take in or out.. I ran mine in last year nad with the front one bypassed for routing reasons, and litteraly NEVER saw my temp light.. ok, I did once, but I was towing a dead sled across dirt back to the truck.. so that doesnt count.. Good venting to keep everthing from heat soaking, and scratchers for the trail are really all you need. Mine had lots of holes to allow the thing to radiate all the extra turbo/header/intake stuff heat, and you could tell it worked, Im beeting with less flow I would have had issues, but mine never had problems, also, the attack 20 kicks a LOT of snow into the tunnel, so that could be it as well. I didnt have that long of a snowflap, and a LOT of stuff went out the back, so im running no rear cooler this year and a stock rx1 flap which is longer, and flares back farther, so that should help quite a bit.

 

[dirk_03]

cooling

I thought that was what you were running? Hmmm. I will still probally try to find a apex rad to have in the case that I can't keep it cool. I am not worried about in the deep in the mountains. I am worried about packed trails, or low snow trails.

 

[Srxspec]

MPI FX Nytro tunner cooler kit = 96" length total (52" on one side + 44" on other side) x 4" wide.

FX Nytro front cooler = 16.375" wide x 8" length.

This is what I'm going to try to run without the FX Nytro radiator installed on a motor setup @ 18-20 lbs of boost. I will have ice scratchers for any hard pack/trail areas.