freelheeler
Pro
Took the sled out for it's first real shake down... and made it home! But with a few more questions
Setup;
20/40 gearing, clutching shockwave and heelclickers (loaded in the front/rear, middle is empty)
162x16x2.5 CE
under tunnel exhaust
A/F= at ideal at 8000'= 13.8-14.5
MPI supercharger
pulleys 24/24
Snow conditions 2+ feet of powder with little base, so the sled was sitting deep in the snow
Issues;
only making 5lbs of boost? figured i should be seeing 7-8 but I never was over 9000 with my rpm's
RPM's were maxing out at 8-8500, figuring i'll drop to a 19 top gear and pull a significant amount of weight out of the primary, plus get new springs
major snow bog, this was the real killer we dropped into a significant basin towards the end of the day and the snow was pushing over the hood and the sled just would not run well when i turned to make the pull out she died and would only run about 1/2 throttle making pulling out a huge undertaking!
I've read on the site about snow bog being an issue with the under tunnel exhaust and that some folks have had success with snorkels? before the supercharger i had the same issue and installed a fan which worked great to move air in the engine compartment while riding deep snow. but with the charger there's such little room and I was getting significant snow packing in
Setup;
20/40 gearing, clutching shockwave and heelclickers (loaded in the front/rear, middle is empty)
162x16x2.5 CE
under tunnel exhaust
A/F= at ideal at 8000'= 13.8-14.5
MPI supercharger
pulleys 24/24
Snow conditions 2+ feet of powder with little base, so the sled was sitting deep in the snow
Issues;
only making 5lbs of boost? figured i should be seeing 7-8 but I never was over 9000 with my rpm's
RPM's were maxing out at 8-8500, figuring i'll drop to a 19 top gear and pull a significant amount of weight out of the primary, plus get new springs
major snow bog, this was the real killer we dropped into a significant basin towards the end of the day and the snow was pushing over the hood and the sled just would not run well when i turned to make the pull out she died and would only run about 1/2 throttle making pulling out a huge undertaking!
I've read on the site about snow bog being an issue with the under tunnel exhaust and that some folks have had success with snorkels? before the supercharger i had the same issue and installed a fan which worked great to move air in the engine compartment while riding deep snow. but with the charger there's such little room and I was getting significant snow packing in
freelheeler
Pro
I should mention the high temp for the day was around 0, and the engine compartment was making a ton of steam and icing up the air filter. I really think the snorkel out of the engine compartment is my solution.
Ratpack
Expert
- Joined
- Oct 11, 2006
- Messages
- 427
- Reaction score
- 4
- Points
- 873
- Location
- Frewsburg NY
- Country
- USA
- Snowmobile
- 2003 RX1
My RX1 used to do that also. I put filter material on all of the hood vents. I have not had it happen since. It was always on a very cold day with a lot of powder. If you put a snorkel on you will have to re jet. Starting line had a large piece of the material.
rxrider
Jan-Ove Pedersen
- Joined
- Apr 25, 2003
- Messages
- 7,355
- Reaction score
- 64
- Points
- 1,753
- Location
- Lakselv - 70N & 25E
- Country
- Norway
- Snowmobile
- 2014 Phazer XTX, 2013 Phazer RTX, 2008 Apex RTX, 2007 Warrior, 2006 Attak
Low boost on SC is caused by your sled being off the target rpm. Shoot for 10400-10500 at WOT on the RX1.
Jetting rule of thumb. AFRs at:
Idle: 14.0-14.7
Engagement: 13.5
0 lbs boost: 13.0
5 lbs boost: 12.5
10 lbs and over: 11.8-12.0
These number are valid no matter what altitude your riding at. Remember, jetting for high altitude will cause lean jetting down at low altitude and vice versa.
Jetting rule of thumb. AFRs at:
Idle: 14.0-14.7
Engagement: 13.5
0 lbs boost: 13.0
5 lbs boost: 12.5
10 lbs and over: 11.8-12.0
These number are valid no matter what altitude your riding at. Remember, jetting for high altitude will cause lean jetting down at low altitude and vice versa.
