<div class="FTQUOTE"><begin quote>Originally posted by: scrambler400enoge

Yes if you call dalton be sure to tell them the wheel size and the type of exhaust and make.It's an Hmf right?, and also tell them if it's full or just a muffler.Oh and call me Mark[img][/img]</end quote></div>

Great info in your posts Mark... I'm learning a lot as we go along here!

 

<div class="FTQUOTE"><begin quote>Originally posted by: DCT

<div class="FTQUOTE"><begin quote>Originally posted by: scrambler400enoge



Yes if you call dalton be sure to tell them the wheel size and the type of exhaust and make.It's an Hmf right?, and also tell them if it's full or just a muffler.Oh and call me Mark[IMG][/IMG]</end quote></div>



Great info in your posts Mark... I'm learning a lot as we go along here!</end quote></div>

Just trying to keep busy so I don't think about the machine sitting in my garage with a possible blown 4wd hub.

 

<div class="FTQUOTE"><begin quote>Originally posted by: scrambler400enoge

Yes if you call dalton be sure to tell them the wheel size and the type of exhaust and make.It's an Hmf right?, and also tell them if it's full or just a muffler.Oh and call me Mark[IMG][/IMG]</end quote></div>


Mark,
Thanks I will give them all the info. Yes it is HMF,just the muffler. Pipe is still stock.
Sorry I didn't notice your name in your sig.

Dave-Yeah,it feels like it is not straining the motor at all,I could be wrong but I think if it would up shift a litter faster it would have alot better midrange performance.
You can feel the power pretty good when you roll into it from say 30mph,as it seems as slow to down shift as it is to upshift,so that keeps it more where it should be RPM wise at that speed IMO. In other words it feels like if you nail when cruising at 30 it hits 40 alot quicker than if you nailed it from a stop and timed how long it took to hit 40 after it hit 30. Make sense? Of couse seat of the pants dynos aren't very accurate,but that is how it feels to me.
Even in the exhaust video I posted you can see it IMO...the motor is screaming. I wish I would have taken more note of the RPMs when it was stock,I know the exhaust makes the RPMs more noticable,but I don't think it was revving as high as it is now.
I'll have no problems not hurting it,I don't play like that very often at all,and since I thnk it has an issue I won't do it at all,if I do it will be foer more testing. and I'll be watching the RPMs real close.

 

HO is it possible that you are feeling a portion of the FI map that is not right sense you changed the pipe? Unlike a carb FI can change jetting at any rpm, the pipe causes the engine to react different at certain rpm's such as when it comes on the cam and this is what you are feeling. You looked at your plugs but you only get a overall view of how it is burning not isolated to a certain rpm, the rpm you are feeling the change. The only way to check FI is on a dyno with a sniffer so as to isolate at any rpm and read the fuel and oxygen ratio. Only a guess, I had a problem like you when I put fuel injection on my chopper with cam and pipe. Still a work in progress with the FI map. It feels like at a certain point it is not pulling properly but its the map at that rpm.

 

+1 on your post Dogdaz,if i were to guess your machine Highoctane may be running a little lean since the pipe installation?An EFi remap maybe in order.

 

Mark-I guess you read my post about reading the plugs right? Yes it was a tad lean with the exhaust and intake mods. I put the intake back to stock. I'm not new to tuning engines by any means. I will admit I am not a clutching expert....but I do know tuning engines.
And it is not the engine...the engine is performing just fine.
It is turning to over 7,000 RPMs with no problem at all...no flat spots in the RPM range at all.
When I said midrange I didn't mean RPM wise...I meant speed wise. I know normally mid-range for an engine is RPM related,but I was referring to mid-range on the machine, as you know on a CVT machine the RPM range should be very narrow,so I said "mid-range" for mid range speed. Sorry if that was confusing.
It would confuse me to if I was thinking of the engines mid-range,I thought that way of explaining it might be easier to understand to most people who ride ATVs with a CVT.
I know a little bit about tuning with EFI,and while the fueling isn't perfect it isn't that far off, is not the problem. As I said the motor screams to 7K no problem...it'll hit 7000+ in high range in a hurry...it is the clutching...


Thanks though.

 

Well after some e-mails to and from Dalton I put the stock tires back on for testing..they thought the tire change was more likely the issue than the exhaust/power mods.
The results were that the RPMs were LOWER for a given indicated speed with the stock tires. So in my mind this confirms that either 1) it is upshifting too slow 2) the belt is slipping. The guys at Dalton said it would be very rare for it to be upshifting too slow with the larger tires but that being a new design anything is possible and they didn't want to guess at the problem. I don't blame them,too many variables. I have smelled no burning recently,so I doubt it is a slipping belt,but hey I guess it could be. Dalton apparently monitors belt temps to determine slippage,alot more accurate than my sniffer. I guess we'll have to wait for Dalton,or someone to do some more testing.
In the mean time I will say that with the HMF exhaust this thing is straight RETARDED on the stock tires! It friggin rolls out for an 800+lbs machine. My neighbors came over,they said they thought we were holding NHRA drags,lol. I guess it is time to find some 26" tires.

 

Don't you dare get new tires! LOL LOL The XTR's are sweet.

Seriously, why get more tires. Let them get the clutching worked out for oversize tires for the 850... then you'll have the best of both worlds. Besides, you can drive it sensibly (I think LOL) until the spring.

 

<div class="FTQUOTE"><begin quote>Originally posted by: DCT

Don't you dare get new tires! LOL LOL The XTR's are sweet.



Seriously, why get more tires. Let them get the clutching worked out for oversize tires for the 850... then you'll have the best of both worlds. Besides, you can drive it sensibly (I think LOL) until the spring.</end quote></div>

LOL..well I have been wanting a set of tires for the stock wheels anyway. I won't get rid of the XTRs most likely. After riding with the 27's for awhile and going back to the 26's the difference seems a little more obvious than it did when I fist put on the 27's. I do alot of slow trail riding in rolling terrain and with the 26's it doesn't bog as much and requires less jocking the throttle...
It is strange how I didn't notice it so much before...guess I am getting old.

 

I got mine to the woods today for the first time and agree there is some clutching issues w/27's. Revs to a certain spot and goes flat. Thought it was upshifting too fast at first but that wouldn't make sense unless we went to 25's. Definitely weight and or spring issue but I'm not at all familar w/Polaris clutching but we did alot of clutching on Ski Doo and I'll dig through notes and see what we did then to fix this issue. There are so many combinations and I'd hate to open up that can of worms again. Maybe there's a Polaris clutching guru that will get this dialed in and I can send him $$$ for his clutch kit.