Turbo Nytro Exhaust issues

[culvert]

Hey guys,

Just picked up a new to me Nytro. 2011 with Alpine rear mount.
Was told it only had 800kms on the turbo install. Loaded it up and went to Valemount this wknd to test her out.

Unloaded the sled and noticed I had no boost and my AF gauge was just 3 dashes. I figured my sensors where bad from it sitting all summer??
Seemed to have more go than a stock Nytro but not 200HP.

Anyway rode it around and it was gutless up top of the hill. Got it back down and made it home to check things out and the flex joint was gone on the exhaust pipe.
What causes this other than age? Maybe something got stuck in the track and hit the flex joint to blow it out? Only 800kms I would think it would last longer.

Is there a better system or way to go with the exhaust? Here is a couple picks.

 

[TApeX_07]

Looks like the track maybe wore it down. Look at the second pic, looks like some wear/rubber marks on the expansion part of the flex to me.. Double check your track tension, I run mine very close to factory tension..

 

[Thistledoo]

Remember MCX?? What happened??

 

[culvert]

Yes it does look like the track came in contact. But the AC tube on the LH sits even lower than the exhaust. It has no contact marks?

I will be calling Alpine today and asking questions.

 

[M5-]

Thats heat, not the track. Just replace it, maybe make some kind of quick connects like a slip fit in the pipes and plan on changing them every 700 k or whatever. You may be able to find a better one out there made of 321 stainless. Depending on how the previous owner rode it ie trail vs powder etc you may not have a similar problem for quite some time.

M5

 

[culvert]

You are right Paul. I went back out today and grabbed some more Pics for Alpine.
It is metal fatigue from heat not being hit. There is a track mark on it but would have been in reverse only the way it looks.

Dean from Alpine says he is running stainless connections now. But I might run to the local muffler shop and see if they can make a slip joint.
Is the flex joint needed or can it be ridgid fit the whole way back?

How does MCX make there exhaust connection? Rear mount is a rear mount.

 

[M5-]

MCX retains the 3 stock Nytro exhaust bellows which are essentially flex joints. Every MCX Nytro will crack the stock header eventually if a guy rides the sled hard at all but they will last 3000k or so them you can re-weld them. I would be disinclined to run it without some kind of flex joint, just spring for a good one.

M5

 

[culvert]

Ok, Thanks for the info.
I'm looking into the stainless joint. And I cant see it being a track issue because this is still the stock Yammy 2.25" track. There is guys running 2.5" & 3" with this kit and no issues.
I will just have to find a way to make it more easily removeable. Not welded in solid like now.

 

[M5-]

These guys have what you need. They sell slip joints etc.

M5




http://www.stainlessheaders.com/index.aspx

 

[BigFish BC]

i know the bd kits had the same prob with those joints collapsing after about a 1000km on there headers, think they went to stainless too.that is why your sled was not running right though,that kit makes really good power.

 

[TApeX_07]

Sorry for the wrong info.. I was just going off what I saw.... Glad you got it figured out tho!

 

[partsman]

Treadstone performance makes a preturbo flex that works well.I have a spare if you need one quick.

 

[Mountaintech]

Replace the bad flex joint with a Vibrant Turboflex or Treadstone unit. Use V Band flanges on either end of it to make it easily replaceable.

 

[culvert]

Thanks guys,
I was told to stay away from the Vibrant ones unless you cut the inner liner out of them. I guess they fall apart and end up in the turbo.
So why is it these joints can last for 1000 of miles in a car but only a short time in a sled application??

 

[motojunkie101]

i know the bd kits had the same prob with those joints collapsing after about a 1000km on there headers, think they went to stainless too.that is why your sled was not running right though,that kit makes really good power.

BD as in boondocker? My BD kit completely replaces the stock exhaust as the turbo mounts on the header.

 

[Mountaintech]

BD as in boondocker? My BD kit completely replaces the stock exhaust as the turbo mounts on the header.

What he is saying is that Boondocker had issues with aftermarket flexjoints as well.......probably on their RX1/Apex kits.

 

[boostedballz]

I'm not completely familiar with the Alpine kit but I believe they have an adjustable fuel controller. If someone has played with fuel settings or ran higher boost then what it was set up for it would cause it to run lean. A lean A/F mixture will severely accelerate header, flex joint, and doughnut wear. Just a thought but definitely keep an eye on the A/F gauge the next time you go out. And if it is an adjustable controller see if Dean can give you some baseline numbers.

LL

 

[Mountaintech]

Had another look at the pics you posted. Best placement for that flex joint would be right off the back of the header. That would keep it out of the tunnel where it is constantly bombarded with snow ,ice, moisture and extreme heat cycling. I never realized how violent things are in there till I tried wrapping an exhaust years ago in a RX1 rear mount. I thought I had done a really good job, but it didn't even last one ride. Running pre turbo exhaust through a snowmobile tunnel is not a great idea, but a necessary evil in a rear mount scenario. It all comes down to economics, because this configuration retains the OEM seat and fuel tank, making the kit price cheaper.But the OEM fuel tank blows because of it 7.3 gallon capacity and placement of its weight too far forward. A Trail tank may up the capacity but it's still in the wrong place. That's one thing the other manufacturers have gotten right......Impulse as well.