5 known 09 D8's Running 8050 rpm

[Polarismaster26]

According to my dealer who is not to help full at times, Told me that "8050 is perfect!" I asked him about the reflash and he says he herd no such thing of polaris coming out with a reflash. I think he needs to pull his head out and look into what is going on. I hear one thing here another there and other stuff in the mountains.

 

[ElectroTech]

Just for a kick, run 87 octane fuel in it next time you go out. Leave the ethanol wires hooked up. See what 4 or more less points of octane do for you. Running 92/93/94 in this new motor is like runnning race fuel on last years. They knocked right around 2 points out of it, 11.6:1 now. Anyone running premium at high altitude is wasting their money. At sea level this thing will run on 87 let alone at 8000+. Dropping 8 grams of weight and no change tells me that you are not burning fuel on the top.
Other possibility is that the new exhaust valve springs are too heavy holding the valve partially closed.

 

[POZZY]

i herd the timing doesent advance till after a certon engine temp. it seems the harder i run my d8 the better in runs, with more revs. when its cooler ill be lucky to get 7700. is there a fix?

 

[Big B]

Me and a buddy took an 08 & 09 D8 to Carls. Both are running 8300 in a foot powder. Best my 09 has ever ran. We had updates with porting and there clutch set up. In my opinion Carls is worth the 8 hour drive. Curtis was great to deal with.

 

[cascadesnowjunky]

I noticed the same as pozzy the longer I run it hard the better it runs. I will actually pick up 50 or so rpm, It will hardly run with a semi cold pipe. I have been running 87 octane for about 4 or 5 rides now, I see no difference in performance and it dont detonate, I ride 4500' to 7000'. I also run slp single and air horn.

 

[ElectroTech]

I agree, Carl's knows these things inside and out, my 09 Assault with cylinder/case porting, head cut for 30% race/pump, SLP twins and re-flash for twins and porting rock.
As for it being a dealer problem I highly doubt it, there is more to it than that, the boys at carl's know their stuff but there are others out there who do as well. Not like all of a sudden guys who had their stuff run well for 30+ years forget how to clutch and keep things running well. As for the CFI its an overcomplicated outdated design comparable to a 1990 car. ECUs/VRs/Caps blowing up all the time are less about the individual parts and more about the piss poor combination effort. Polaris electrical/electronics leave alot to be desired. Anyone who has or does work on polaris products knows that at best its a constant battle to keep up with breaking wires, chaffing wires, poorly routed wiring, underprotected in one area overprotected in others. Quite simply polaris has a good mechanical engineering end of things, their electronics/electrical engineering is sooooooooooooo crappy its not funny. There are more wires on a sled now that don't actually need to be there than there are wires that do need to be. They need to first separate ignition/fuel delivery/and all the other stuff that doesnt make the sled run. It pisses me off to no end to see a guys sled go down because he pinched a handwarmer wire and fried his VR.

 

[RMK-King]

My 09 700 is the same way,just dropped 8 grams with no changes in the peak RPMs? Doesn't make sense to me,tach off? Its like its governed at 8100 or something.

I have a update on this,with 58gram weights it ran 8000rpm at 2000ft. I brought the sled to 8000+ft with the same 58 gram weights and it pulled 8150-8300RPM, yeah figure that one out. It ran great at cooke so I guess I wont complain! Just odd it wouldnt pull those RPMs at lower elevation.

 

[Str8uptrnlft]

09d8

was told 8050 is where Polaris wants it to run, cannot get more without PCV or porting

 

[AKSNOWRIDER]

was told 8050 is where Polaris wants it to run, cannot get more without PCV or porting

my 08 with 10 update turned 8150 with zero miles on it..by the end of the first day it was running 8350...clutching matters...

 

[WyoPro]

Ak I was talking with you about the clutching earlier in the year...was hitting 7900-8000 under load at 8-10000 ft. Waited until I had around 150 miles on update to drop weight. Gained signifigant track speed after drilling weights out to gain 200+ RPM on top. Sled hits 8250 and holds it all day long in deep snow!! Sled has SLP setup and per dyno with 2010 updates and flash should be right around 159-160 HP without PC-5 (obviously not at 8-10000 ft.).

 

[AKSNOWRIDER]

Ak I was talking with you about the clutching earlier in the year...was hitting 7900-8000 under load at 8-10000 ft. Waited until I had around 150 miles on update to drop weight. Gained signifigant track speed after drilling weights out to gain 200+ RPM on top. Sled hits 8250 and holds it all day long in deep snow!! Sled has SLP setup and per dyno with 2010 updates and flash should be right around 159-160 HP without PC-5 (obviously not at 8-10000 ft.).

I am glad its working good for you now...big difference in sled performance with that extra 2-300 rpm......

 

[SledheadBKM]

o8 d8 163 running 7900

i have a wierd 1 for you. when i was riding my sled all last year, it would hit 8250 rpm every time i pinned the throttle, without fail, no matter what the conditions. parked it in the springtime and all was well. pulled it out in november for its 1st ride of the year and could only get 7800-7900 rpm. i drained the old fuel and had the same results. then replaced plugs and had same results. replaced belt that had over 1000 miles, sled worked better but the max rpm was still 7900. so then i took it in to the shop and they said it was time to go thru the clutches. i've had it out twice since then still only hitting 8000, once in a while getting to 8100. here is another strange thing i noticed. if i hold it at 3/4 throttle, or just under wide open, it seems to run the same rpm, not getting anything extra going from 3/4 to full throttle. my sled is stock other than an hps can and 19 tooth top gear.
any ideas?
almost forgot to mention, i haven't had my top end update done yet.

 

[AKSNOWRIDER]

i have a wierd 1 for you. when i was riding my sled all last year, it would hit 8250 rpm every time i pinned the throttle, without fail, no matter what the conditions. parked it in the springtime and all was well. pulled it out in november for its 1st ride of the year and could only get 7800-7900 rpm. i drained the old fuel and had the same results. then replaced plugs and had same results. replaced belt that had over 1000 miles, sled worked better but the max rpm was still 7900. so then i took it in to the shop and they said it was time to go thru the clutches. i've had it out twice since then still only hitting 8000, once in a while getting to 8100. here is another strange thing i noticed. if i hold it at 3/4 throttle, or just under wide open, it seems to run the same rpm, not getting anything extra going from 3/4 to full throttle. my sled is stock other than an hps can and 19 tooth top gear.
any ideas?
almost forgot to mention, i haven't had my top end update done yet.

try new primary and secondary springs in the clutches..they do sag and loose tension..both the heat of the clutches and time take them out..good idea to replace every season or even more often if you put on a lot of miles in a season...while you are doing the secondary spring throw in a couple of delrin washers which help the secondary shift smoother and more consistent.....

 

[diamonddave]

I have a update on this,with 58gram weights it ran 8000rpm at 2000ft. I brought the sled to 8000+ft with the same 58 gram weights and it pulled 8150-8300RPM, yeah figure that one out. It ran great at cooke so I guess I wont complain! Just odd it wouldnt pull those RPMs at lower elevation.

Sledmax...Based on your first post of dropping 8 grams with no increase in RPM's, it sounds like your way too rich in full throttle conditions, or maybe exhaust valve issues.

It's really looking like these sleds are going to need a fuel controller for fine tuning. It's amazing how a 2-3 +/-psi difference in fuel pressure between different sleds can lead up to a 10% difference in volume for injector output.

ElectroTech hit the nail on the head. Polaris' electrical is very suspect. Unfortunately, it is no better on the Rush.

 

[ElectroTech]

Please someone give my 87 octane idea a try, on my mod I can notice a difference of only several points in my mix, it will pull more RPM when the octane is lowered.

Oh and if you picked up rpm when you went up in altitude its possible that you actually went the wrong direction by going 8 grams lighter, if it didnt have enough load it may not have been building heat in the pipe, if when you were sitting at 8050 it was doing a wawawa noise (aka pipe zoomies) you were to light on the weights, too shallow on the helix, or to low on the gearing.

 

[rmkboxer]

Please someone give my 87 octane idea a try, on my mod I can notice a difference of only several points in my mix, it will pull more RPM when the octane is lowered.

Oh and if you picked up rpm when you went up in altitude its possible that you actually went the wrong direction by going 8 grams lighter, if it didnt have enough load it may not have been building heat in the pipe, if when you were sitting at 8050 it was doing a wawawa noise (aka pipe zoomies) you were to light on the weights, too shallow on the helix, or to low on the gearing.

I will try the 87 octane, I have am pulling 8000 dropped from 82-8300 from before. I am going to run my stock can since my cpi can blew out. I geared down to a 19/42 and put a camo extreme on which may also helping with lowering the rpm. hopefully I can ride next weekend and I will give a report. I know the fuel worked for the m7's

 

[t stone]

finely running good and now this.

400 miles on the 2010 update running the best since 2008 before the first melt down and now this.





Broken crank!!!!!

 

[trailtoy1993]

According to my dealer who is not to help full at times, Told me that "8050 is perfect!" I asked him about the reflash and he says he herd no such thing of polaris coming out with a reflash. I think he needs to pull his head out and look into what is going on. I hear one thing here another there and other stuff in the mountains.

Would that dealer now be located in Monroe?

 

[CO 2.0]

Ak I was talking with you about the clutching earlier in the year...was hitting 7900-8000 under load at 8-10000 ft. Waited until I had around 150 miles on update to drop weight. Gained signifigant track speed after drilling weights out to gain 200+ RPM on top. Sled hits 8250 and holds it all day long in deep snow!! Sled has SLP setup and per dyno with 2010 updates and flash should be right around 159-160 HP without PC-5 (obviously not at 8-10000 ft.).

What are your clutching specs? Does it hold 8200rpms on deep long climbs too?

 

[nanook]

400 miles on the 2010 update running the best since 2008 before the first melt down and now this.View attachment 94941

View attachment 94942

View attachment 94943

Broken crank!!!!!

Ouch! WTF Polaris, it's bad enough we have to deal with the fuel delivery issue and now crankshafts? Hopefully it's isolated cases, Polaris had enough trouble with cranks on the old 800 twin.