Does any one know how much the TPS adjustment influences the overall air fuel ratio on a 2006 or newer injected 2 stroke? There is some info out there for different setting's for altitude. This seems to indicate some kind of a fueling shift by adjusting this. I have a 700 Polaris Fusion that I believe to be running too rich and want to try an lean it out a little somehow. Plug's are dark brown. I am getting about 9.5 MPG no matter how I ride it with a very loose track preload. I am told by dealer that this is normal. My eyes burn at stops with a black ring in the snow after a short idle when fully warmed up.
A number of data input go into the fuel/air mixture:
I've never worked on one of these sleds but I'm assuming it's a speed-density EFI system since there is no MAF sensor. While it is easy to fool a speed density system it is not suggested; taking a correct sensor away from the system could endanger the sled becuase it cannot correct itself.... if the ECU even knows there's a problem.
On another note my Twin is a turd, it gets terrible fuel mileage... seems like a tradeoff to me. I also run all my machines fat becuase that extra 1hp isn't worth a piston and head. 10mpg isn't really THAT bad... I want to say you're probably only going to get 11 or 12 on that thing stock.
Gotmud, any idea where you are on your CFI?
__________________ You don't have to flinch for me to know that you're scared.
I haven't even pulled a plug to check it yet lol. I haven't done ANY reading up on the cfi yet. I'm going to investigate this summer when there is no riding lol. I'm sorry dude but I am of no help here. Next year on the other hand I'll be more knowledgable on the cfi.
"Do not go where the path may LEAD, go instead where there is no path and leave a TRAIL"
Originally Posted by Rubi
Nobody on this site likes Ski Doo except Dirty Harry, and he's better at making babies than buying or fixing sleds, so you don't want to listen to him.
The engine is CFI Fuel Injected and has no carbs. The only reason I am trying to lean down just a bit is I have talked to at least 4 other's with the same sled ( 2006 700 Fusion) and they indicate they get 11-13. The side of my belly pan just behind the exhaust gets black after 100 or so miles and the other sleds and guys I have talked to sleds don't do this so quick. I will get it sorted out. Thanks for the feedback and let me know if you hear any thing new on this subject.
I am probably going to open up ( gut- put holes in it) the Air box after the 1 year warranty expires which will lean it out a little. I bought this thing as a left over this year for a pretty good price. These are going to be summer improvements for next year. Thanks again.
My oil consumption is right in line with about what I would expect ( 1qt./100 miles). The Fuel pressure was found too high and fuel pump was replaced under warranty. Spec is 8 bar ( 116 psi ), mine running at 150 psi !! Dealer told me they have found several machines with this condition. Something for those with injected Polaris's to keep in mind to check if they seem to be running too rich. Don't know the results of the new lowered pressure yet, have not had a chance to get out and ride since the repair. It should have a favorable result.
The fuel pump and regulator are built as a unit inside the tank. I will see how the lower pressure works out and go from there.I have 1700 miles of experience @ 9.5 to 10 MPG at 150 PSI. The pressure being closer to 120 is a 20% reduction which should net a good flow reduction.
As far as the Dealer, I talked to a different Tech. at the same dealer that I had talked to several times. I just happened to luck out and talk to the right person this last time.
The fuel pressure change increased the fuel economy and low end performance. The engine is running cleaner. Before, when you would hit it hard after running slow for a while, there use to be a black plume of smoke on the first hard accel. It is now much less and seems just a little crisper with the plugs burning a nice lighter brown color vs. chocolate brown before. I managed a little over 12 MPG on 1 tank. It is running about where the factory should have had it. I am still going to do some more tweaking, but am pretty happy of where its at now.