Kachess
TY 4 Stroke Junkie
Our turbo was always a little weak compared to others (turbos). When I took the turbo off the sled it was obviously weak compared to our other stockers. The exhaust had a strange tone, and the sled backfired on decel. It also had a scent of burning oil. Compression and leakdown were good. I checked for exhaust restriction, nothing. I swapped electrical, then carbs, then checked and adjusted valve clearance. Absolutely frustratated I pulled the head off yesterday. Bad news is the cylinders look fine. Good news is while pulling the bellows exhaust outlets off I found one of the little exhaust donuts was disintegrated. I could see how that might cause the strange exhaust tone, but can it affect how the engine runs?
I'm not sure but I'll let you know this winter. I did the under tunnel exhaust and found all four donuts disintegrated. I did find a little piece of one of them. I also had a different exhaust tone. The sled is quieter at start-up than last year. Waiting on new sliders so I can't hear the higher revs yet.
it can and it will. You loose preasure to the turbo that way. The exhaust preasure is what spins it. I cracked the exhaust manifold on my big truck, and it was down almost 20% on power. Fixed it and right bck to normal. Maxdlx
maxdlx said:
The manifold I can see cause that is where the pressure is to spin the turbo he is talking about past the turbo where it should not make a difference in power but sound different for sure.
RXMax
Expert
Sled Dog said:
"usually" the bellows are between motor and the turbo especially for rear mounts and most front/mid mounts... I would say that would lessen the exhaust pressure to the turbo..
givemeaboost
TY 4 Stroke Junkie
- Joined
- Dec 5, 2003
- Messages
- 689
- Location
- Great Falls, MT.
- Country
- USA
- Snowmobile
- 03 Rx1 Turbo
- LOCATION
- Great Falls,MT
If he's talking about the exhaust bellow donuts it's most likely a rear mount turbo and the leak would be before the turbo and it will cause a serious loss of power.
Ok that would make sense as long as the leak is prior to the turbo.
RXB-1
Extreme
The poping on decel is a sure sign of an exhaust leek. Will you put the turbo back on??
Kachess
TY 4 Stroke Junkie
I can imagine a bad gasket robbing power from a (rear mount) turboed sled, but should it have affected how the sled ran without the turbo? It had significantly less power than our other stock sleds? Almost seemed like it was running on three cylinders. I still plan on slapping it back together with a new head gasket, and new exhaust gaskets. I guess we'll see.
If I get it running right, my son's vote is to reinstall the turbo. Probably should be putting an extra head gasket in while I have it apart.
If I get it running right, my son's vote is to reinstall the turbo. Probably should be putting an extra head gasket in while I have it apart.
It takes nothing exhaust leak wise to make a rear mount turbo run like a turd. My buddies Bender was the same just wouldn't make boost ran like a dirtbag. I remember when you were going through that and I apologize for not thinking of the exhaust at the time cause they always go bad over time, I should have caught that right away. The heat just cooks them. Eventually the stock Rx headers crack as well. We just finished re doing my buddies Bender setup and everything was cooked in there, headers cracked etc etc but its got 5000+ miles on it in the last 2 seasons. If you've got nothing to do slap it back on there cause there's no reason that sled shouldn't just kill it. The only other thing I remember about your setup is that you still had the stage 1 airbox, where an intercooler will help a lot in delivering a cool charge and improved running.
If you do it put a head shim in there and do the cam timing while you are at it, I'm not a fan of the multi gasket thing, too many layers for leaks to start at. With the headshim you'll have a 12lb pump gas setup that you can ride all day. If you don't have one put on a good quality A/F guage as well you can't truly tune these sleds without one cause two identical sleds sitting side by side on the same day can need different jetting, don't ask me why.
Rx1M5
If you do it put a head shim in there and do the cam timing while you are at it, I'm not a fan of the multi gasket thing, too many layers for leaks to start at. With the headshim you'll have a 12lb pump gas setup that you can ride all day. If you don't have one put on a good quality A/F guage as well you can't truly tune these sleds without one cause two identical sleds sitting side by side on the same day can need different jetting, don't ask me why.
Rx1M5
ViperTurboPete
TY 4 Stroke Master
- Joined
- Mar 25, 2005
- Messages
- 1,068
- Age
- 57
- Location
- Sudbury, Ontario
- Country
- Canada
- Snowmobile
- 2015 Viper XTX LE MPI Turbo
2022 Expedition Extreme 850
My sled doesn't sound as smooth as other RX's I have heard. It also has a tinny rattle going on under the seat.
Are donuts expensive? Is it a big job to change them out? Just wondering before I do a search on how to.
Are donuts expensive? Is it a big job to change them out? Just wondering before I do a search on how to.
RX1MPete said:
Yea I need some info on how the rx1 sounds like with a donut gone myself. My 04 sounds normal but my wife's 05 sounds like there is something rattling in the muffler.
Kachess
TY 4 Stroke Junkie
The donut missing makes a slightly different exhaust tone. I think the rattling is the sheet metal shields riveted to the bottom of the exhust header "y"'s. Every sled we've had ones that rattle. We cut them off at their mounting brackets just so we don't have to hear them. All seems to work well without them. There is also a shild attached to the bottom of the exhaust that goes awy when do our undertunnel exhaust. They all rattle.
Thanks I am going to have to check it out as it sounds gross the way it is. Runs fine though.
Easiest way for me to tell when my donuts are bad is my sled pops on deceleration.I get about 4k to 5k out of a set.(No turbo)
