Ski-doo turbo set-up's / results

[summitxtreme]

I had that same problem also. Mine was just drinking gas. I just adjusted my fuel pressure down to about 3lbs at idle and closed my powerjets all the way. My egts are still perfect this way. Highest temp I seen while riding yesterday was 1220 degrees and that was on a very long pull on a steep hill in deep snow. Tell your buddy to try this and just watch his egts. 1200 to 1250 on a long pull is just fine. Hope it helps.

 

[Mr_Joshua101]

I had that same problem also. Mine was just drinking gas. I just adjusted my fuel pressure down to about 3lbs at idle and closed my powerjets all the way. My egts are still perfect this way. Highest temp I seen while riding yesterday was 1220 degrees and that was on a very long pull on a steep hill in deep snow. Tell your buddy to try this and just watch his egts. 1200 to 1250 on a long pull is just fine. Hope it helps.

You did that peak kit didn't you?
Sounds like you got it tuned in pretty good then.
Does it have the Rave Valves in?

 

[jmoore]

Mileage

Rode the Turbo Performance Turbo XP for three solid days and can get 50-55 miles at 10-12lbs of boost and 3-4ft. of powder before I add any fuel??
Rave valves "in" with the Turbo Performance rave valve pressure control system!! Hummm???? That's ok just keep blocking them wide open!!! We here at 10,000ft don't have a clue.

 

[canucklehead]

That's great. Too bad it's such a secret.

 

[jmoore]

Common knowlege with the purchase of a Turbo Performance Kit!!!

 

[Fack]

My guess would be the fuel mileage issues are due to running too rich vs. blocking the power valves open. The common problem seems to be way rich on the bottom to mid range on these turbos. This just happens to be the same RPM range that most of the cruising and traveling is done at. I'll know for sure shortly how blocking the power valve affects mileage. I know on the "R" motor they were holding the power valve closed longer to meet sound emmisions. I don't remember any of them getting any better fuel mileage than the old series III motors....

-Fack

 

[Todd H]

Fuel....

My fuel use on my sleds is completely different, the 900 drinks it like a cold beer on a hot day. It is terriable. The XP on the other hand is almost as good as stock.

The 900 has been hard on fuel right from when it was first built, but goes like hell

This is with the valves operational. Bryce was explaining to me about the valves and thought that he had it figured out. Jim, you must be one of the guys that was trying it out ( or maybe you came up with the idea, not sure)

I'd like to ride both of my sleds with the valves open and see what it is like. I can't keep bellows in the 900, and the XP is too on/off in really steep, rough climbs (especially with the way the factory skid works with boost).

If I don't like it I can always go back to having them operational.

Either way, I post my results, and try to get some video.

 

[summitxtreme]

Yes mine was originally a peak kit that Dave Halverson tweaked a bit. He changed quite a few things around and yes he Deleted the rave valves and put it a custom set of block offs. I too ride at 10,000 feet and I rode the snowies sat and sun with no issues at all. Hill climbing is a blast on a turbo sled.

 

[Todd H]

Wheely problem?

Well why are you running such short track sleds on the hill in the first place???

Didn't plan on turboing them when I bought them. The XP is going to get a longer tunnel, skid and track.

Too much into the 900 to do anything else. I would love to put a 174 on it, but the tunnel is already done, new skid, etc. Unless VanAmburg can change the tail piece....Now you have me thinking, got to make some calls.

 

[Todd H]

Yes mine was originally a peak kit that Dave Halverson tweaked a bit. He changed quite a few things around and yes he Deleted the rave valves and put it a custom set of block offs. I too ride at 10,000 feet and I rode the snowies sat and sun with no issues at all. Hill climbing is a blast on a turbo sled.

Care to share your set-up? Never heard of the peak kit, what does it run for a turbo?

 

[gus bohne]

Josh,,
When under boost there is no fuel mileage,, its fun mileage...

IF the raves are giving someone different fuel consumption,, then they are NOT on boost. they are in lag ..

If you have heavy consumption and are not jetted rich ,, the only answer is poor set up, requiring an high volume mix to keep out of deto..

When under boost, even just 1 psi, you are pressureizing the bowls and PUSHing fuel up the jets. Even prior to reaching 1 psi you have inches manifold pressure exerting on the fuel surface in the bowl.

This is why its neccesary to reduce pilot and needle jet size when blowthru turbocharging..
These circuits begin fueling BEFORE the pressure has risen to just 1 psi..

All common Knowledge from BSP...LOL
I'll just keep answering questions and teaching the builders....lol


If you have a mitivac hand pump tool, try just adding an inch of pressure to the vent lines of 1 carb,, watch the fuel level rise in the powerjet line,, now you can see with your eyes the effect of just the smallest amount of pressure in the bowls ABOVE atmospheric.. The engine still has not seen enough boost to make you feel any power change ,, so you end up rich, burning excessive fuel and chasing your azz in a circle..

Another NOTE for those who run mikuni oem flats with PLASTIC floats,,
the float acts very very light vs a std nitrofil float.. you cannot run high base pressures with these carbs, I like the idea of using the BOV vac to run the fuel pressure reg too for this.. Good call.

Gus

My 20 years of 2 stroke turbos is the difference...