858 Needs More Air!!

[Chewy22]

Since we are on that topic. After some time on my sled, I think the upper hood vents are the most critical. I have the other two sets installed still waiting for the hood kit. There is a ton of heat that wants to escape the top of the hood. In my opinion the goggle box gets too hot. Every time we stopped for a break, I would open the lid and it was crazy the heat that would come out. Those upper hood vents will release a ton of heat. After I get the hood vents installed I’m thinking about heat taping the holes in the box. Or maybe a vent kit for the lid would work great too.

 

[arcticridr]

Yea figured after I posted you were after more intake air not under hood air but those would help with the hot goggle box getting more cool air in the whole under hood area gotta help with clutches etc.

 

[Chewy22]

Was not aware there was intake vents here. Surprised how easily this sled gets choked out in over the hood snow.

 

[Vern]

Interesting, is everyone sure it’s 100% an intake bog? I only have one ride on mine without the best snow so have no actual experience to add, but in a lot of the videos I’ve watched it seems a lot of the bogs are happening with the right side of the sled buried. Could it be an exhaust bog, or are you guys getting the bog with the exhaust side out of the snow as well?

 

[Chewy22]

It was both for me. But if you kept the vents brushed off it would not exhaust bog as bad.

 

[turboless terry]

My 19 was bad in super deep snow. Almost unrideable one day. Wipe intakes and would go for a minute. My 20, in same snow, wouldn't bog at all. You tell me what the difference was.

 

[go-on-two]

After taking a very close look at the air-box (still attached to hood) i have no idea how this sled even breaths. From the intake location on the hood sides, it snakes through some very tight looking plenums and corners to eventually reach the lower air-box half. I sure hope someone comes up with an air-box that flows better then this stock one, its a rediculous design, and no wonder they choke for air when covered in the slightest bit of powder!!

 

[tuneman]

It's what you would call a "labyrinth intake". While not the most elegant design, it actually probably does more good than bad. Labyrinth intakes are to smooth the airflow, make it more laminar. Cat definitely could have done better though.

 

[go-on-two]

Has anyone split the intake in half to examine?? Or maybe somebody has modified it slightly to breath better? Could be it can't be improved as designed, not sure but was hoping peeps out there have tried something with measured success!!
With a bit more air and some clutching this sled could really be a beauty IMHO.

 

[Sage Crusher]

I used to cut the Mouse maze of columns in the Ascender intake track- and seemed to flow better but did increase intake noise, which didn't bother as I knew it was breathing.

 

[Chewy22]

I don’t think you should cut the inside of this one. It is designed to keep water out of the lower intake box. I split mine yesterday and surprised how much water was in it, but no water in the lower intake box. This was after sitting in the garage for a week.

 

[dgibbons]

I received my Fire-n-Ice kit yesterday. Looking over the kit, I had a crazy thought. Could you get away with gluing the stock screens/frogskins to the framing of the fire-n-ice intakes? I think the instructions say to remove the stock screens. Why not just glue back over the top of the F-n-I kit? Best of both worlds, more durable, plus easier to whip off. But maybe both installed would restrict airflow to much? Just thinking out loud, thoughts?

Got my Fire N Ice Intake vents installed correctly and they're arguably worse than backwards. I had the same thought as you on the mountain yesterday..... the exterior frames need frogzskin over them. If you can get stock vents off without destroying them, that'd be good. The adhesive on the frogzskin took quite a bit to get off the hood, but I also didn't use heat. I'm going to order some I think. I wouldn't order the Fire N Ice vents again tbh, I'd find a different option as they just hold snow. The engine compartment seems to hold a ton of heat - I want to get some side panel/hood vents as well to help with that and hopefully get more cold air to the intake vents I'm adding per CO2.0's post. I had terrible intake/exhaust bog yesterday in deep snow again.

 

[dgibbons]

I hope that has changed just got in a few sets

It hasn't - confirmed yesterday on the mountain, crystals formed under the frogzskin mesh in the thicker mesh. The engine compartment is hot enough if you stop for a couple minutes, the vents melt themselves out.

 

[dgibbons]

I don’t think you should cut the inside of this one. It is designed to keep water out of the lower intake box. I split mine yesterday and surprised how much water was in it, but no water in the lower intake box. This was after sitting in the garage for a week.

After opening up my plenum to seal the edges, I agree. I left the foam in the plenum for that reason, to soak up water that inevitably gets in the intake plenum....

 

[Chewy22]

Got my Fire N Ice Intake vents installed correctly and they're arguably worse than backwards. I had the same thought as you on the mountain yesterday..... the exterior frames need frogzskin over them. If you can get stock vents off without destroying them, that'd be good. The adhesive on the frogzskin took quite a bit to get off the hood, but I also didn't use heat. I'm going to order some I think. I wouldn't order the Fire N Ice vents again tbh, I'd find a different option as they just hold snow. The engine compartment seems to hold a ton of heat - I want to get some side panel/hood vents as well to help with that and hopefully get more cold air to the intake vents I'm adding per CO2.0's post. I had terrible intake/exhaust bog yesterday in deep snow again.

I was able to carefully pull off the stock frogskins and put them over the top of the Fire n Ice frames. I did not use heat and the glue stayed on the skins.

 

[dgibbons]

Since we are on that topic. After some time on my sled, I think the upper hood vents are the most critical. I have the other two sets installed still waiting for the hood kit. There is a ton of heat that wants to escape the top of the hood. In my opinion the goggle box gets too hot. Every time we stopped for a break, I would open the lid and it was crazy the heat that would come out. Those upper hood vents will release a ton of heat. After I get the hood vents installed I’m thinking about heat taping the holes in the box. I personally think it gets too hot. Or maybe a vent kit for the lid would work great.

I am spamming this thread but I missed this response. We are seeing the same things, heat is a big issue as I mentioned in my post above. I told my riding buddy yesterday, I have never had a sled that sweats as much snow off it as this 858. I will be buying vents as well for it. Adding vents on the intake, a side panel/front cowl vent here would help. There are stock frogzkin hood/cowl vents right around the corner from the circled area, but it would be good to get a vent here as well. Haven't seen anyone make one for here yet.

 

[dgibbons]

Interesting, is everyone sure it’s 100% an intake bog? I only have one ride on mine without the best snow so have no actual experience to add, but in a lot of the videos I’ve watched it seems a lot of the bogs are happening with the right side of the sled buried. Could it be an exhaust bog, or are you guys getting the bog with the exhaust side out of the snow as well?

As of yesterday, it's both intake/exhaust for me. Sunday was the first day I noticed serious exhaust bogs. I have about 85 miles on my sled now over 3 rides, 2 of them in over the hood pow. I virtually couldn't do a right handed side hill yesterday. Every time I had the exhaust bog, the intakes were covered to some extent. The sled is gasping for air and when the sled is idling, the vents hold snow in them from the intake vacuum and the intake/exhaust bog screwed me multiple times in the trees. The sled would absolutely fall on its face on the right side at inopportune times.

 

[dgibbons]

I was able to carefully pull off the stock frogskins and put them over the top of the Fire n Ice frames. I did not use heat and the glue stayed on the skins.

I hope this works - at least a quick swipe should actually clear them, similar to ascender vents. I had my fire n ice vents glued to the stock vents, so mine were a complete loss when I reinstalled the fire n ice correctly...

 

[rkm]

I

As of yesterday, it's both intake/exhaust for me. Sunday was the first day I noticed serious exhaust bogs. I have about 85 miles on my sled now over 3 rides, 2 of them in over the hood pow. I virtually couldn't do a right handed side hill yesterday. Every time I had the exhaust bog, the intakes were covered to some extent. The sled is gasping for air and when the sled is idling, the vents hold snow in them from the intake vacuum and the intake/exhaust bog screwed me multiple times in the trees. The sled would absolutely fall on its face on the right side at inopportune times.

I bet your problem is more related to the safety retard for exhaust overtemp. They get super hot and detune hard when exh temp gets over 1000.

 

[Pirate16]

I

I bet your problem is more related to the safety retard for exhaust overtemp. They get super hot and detune hard when exh temp gets over 1000.

Would an aftermarket tune fix this?