Turbo waste gate stopped opening

[Kwillman]

Hey Guys, I am looking for some help / advice. My sled is a 2021 165 turbo. It has 170 miles and 20% left on the break-in. Today got out to ride some proper deep snow (2-3 feet) and the sled was doing great for the first half of the ride pulling perfect RPM's at 7900. You could hear the waste-gate open and spool the turbo. after 2 hours of riding I noticed loss of power and could no longer hear the waste-gate or turbo working. No codes and no warring lights were present. I did take a couple of pulls to see if RPMs dropped and I was only able to get them up to 7200-7400.

I currently have the hood off looking for anything out of the ordinary but did not find anything. Thanks for the help and happy new year!

 

[powdersnobb]

Wastegates usually do not make any noticeable noise. Turbos spool when the gate is closed and the wastegate opens once max boost it hit. It sounds more like your wastegate is stuck open which will cause it to not spool and just dump all exhaust through the silencer bypassing the turbo. I would make sure there are no loose hoses, check that the air box fresh air valve is operating correctly, then dig in to the wastegate. The wastegate is controlled electronically and is a bit more complicated than aftermarket basic wastegate designs as it uses exhaust gasses to keep the turbo spooled after decel. I have not worked on these sleds yet, but I don't think you have a BOV. Those can stick open and cause issues too.

 

[TreeThrasher]

Sounds more like the wastegate is not closing to build boost. With the hood and belt off, fire the sled up.
Wastegate should cycle from
Shut to open and then close again as you hit the throttle and rev it up.

 

[Norona]

Check to see if the bar for the waste gate is off, i had one that the clip broke off, nothing bad can happen except your now riding an 850 without the turbo, its a 5 min fix, free at your dealer for the clip, of carry some bailing wire(thin) place the bar back on and put the wire around where the clip would go, we placed silicone on it to keep the clip lubricated

 

[Kwillman]

Sounds more like the wastegate is not closing to build boost. With the hood and belt off, fire the sled up.
Wastegate should cycle from
Shut to open and then close again as you hit the throttle and rev it up.

Yes I lifted the rear end and fired sled up and waste gate opened and closed. Put it back together and plan to go out for a rip and see if it fixed itself.

 

[Kwillman]

Check to see if the bar for the waste gate is off, i had one that the clip broke off, nothing bad can happen except your now riding an 850 without the turbo, its a 5 min fix, free at your dealer for the clip, of carry some bailing wire(thin) place the bar back on and put the wire around where the clip would go, we placed silicone on it to keep the clip lubricated

Thanks for the note. Yes we checked the clips and all were good and waste gate functions. Next time the hood is off I will hit the clips with some Silicone. Good call on bailing wire for the in the field fix.

 

[Kwillman]

Hey guys quick update on why my Turbo was not building boost. See attached diagram.

Basically it was assembled wrong. If you loose your boost this is something to have a look at. I rode on Sunday and all was good in 2-3 foot deep heavy snow!

 

[towerrigger]

So it was never building boost then? Just always pulling straight from air box.

 

[caper11]

My thoughts exactly, if that was built wrong it should of never worked from day one.