Fixable or Run? 2010 800 CFI

[Cooksend]

Got my eye on a 2010 RMK Dragon 800 CFI. It has had all motor updates and flashes done and had the PCIII added. Running flatland does not seem to be a problem, it does however go into saftey mode (or something like that) when running at elevation out West. This has been a consistant problem out west. I do make a run out west every winter if possible so it is a concern.
Has anyone else experienced this? Should I run or is there is simple fix? Maybe this one is just a problem child...

Thanks

 

[MORSNO]

You need to change the clutching (weights and springs) when going between the flatlands and out west. Simple fix!

 

[Cooksend]

Comes stock with high altitude clutching. That is what he was running both times he was west with it. Seems to be detination sensor going off or something like that...

 

[rocket]

Any details on when the detonation sensor goes off? Midrange, WOT or other? What type of fuel is being used? Based on past experience, I'm suspecting Polaris has the motor tuned more "aggressively" at altitude than at sea level - they've been like that for years. That could mean more ignition advance, a little less WOT fuel or other small tweaks that make the motor more sensitive. That said, the fuel controller map may not be quite right for altitude, while it might be fine for sea level. There are specific parts of the RPM range where these motors can be quite sensitive to fuel. Find out a little more about when the "limp mode" becomes activated and whatever you can find out about what the fuel map changes are in the fuel controller and post back. There is a lot of collective experience on here - maybe someone else has seen the same symptoms.

 

[bhrider]

what kind of fuel, and fuel plug are your running when out west?

 

[diamonddave]

There's 2 things that may be going IF it runs well at one altitude and not the other.

First off...the clutching on the CFI's is very critical. If the clutching isn't right, it can/will cause the deto sensor to kick off. I don't think this was intended by Polaris in their mapping/programming but if you're not loading the motor down enough on a 6, 7, or 800 CFI, they will blink the deto light, feel like their hitting brick wall's, and or bounce off the rev limiter.

I fixed about 6 sleds last year that were not having the motor loaded down enough.

The other thing I found last year with a couple of different sleds is that some of these sleds' mapping's that are programmed into the ECM will flat out just not work when changes in altitudes occur.

My wife's 09 600 will run awesome at McCall altitudes but with the same map here back home, when the sled gets below 2,800 ft. the sled will bog on full throttle pulls. I tried the same ECM in another sled, same exact thing at the same exact location.

So I've had to run a different map here than I run at altitude's higher than 6,000 ft. Makes it a pain in the rear to have to run 2 different maps.

It would sure be nice if the baro sensor and ECM on the CFI's actually worked and compensated for altitude changes like they should.

 

[AndrettiDog]

If it is the red engine light that is coming on...pay attention to how many times it blinks in a sequence (from start to when it pauses and starts over again). This is key in determining why that light is coming on. I'd also take the PCIII off to make sure you don't have the wrong map in it. You can easily do this and it should run fine w/o it.