terbob3 - for the win

me - facepalming.  I was at that site previously.  Didn't remember to go back there.

Thanks.

sre

Let us know if you do this and if it works. I have a 2021 with this issue as well.

Once I recovered from the facepalm, I ordered it. 
I followed up w a call to them a day or two after.  The parts guy pointed out that I'd ordered a Z part for a U model.  I told him what I was doing and he, of course, wouldn't go on record about whether or not it would or could work.  He mentioned that it being an electrical part I couldn't return it once opened.  The packaging is apparently clear enough to see the plugs.  I'm hoping that I can determine if they're the same without opening it   He also said that he had sold several in the last few months.  So far, it hasn't arrived at their store to be shipped my way.

<fingers_still_crosssed>

sre

Funny... not funny....  I'm still waiting for the ECU.

I have been working on a homemade snorkel system.  I'm mostly done, but taking my time.

My ECU finally came yesterday.  Once I found my 10mm socket and ratchet it took about 3 minutes to disconnect the negative battery connection and install.  To save some of you the trouble, the ECU is right behind the drivers seat.

I am very satisfied with the change.  Now, when I slowly roll on the throttle it picks up and just 'goes'.  Gone is the jump that always happened right as the throttle cracked open.  Reverse is steady and controllable.  I don't have to hold the brake on so that it doesn't launch backwards.  It is the same when starting off on an incline.  I can go from the brake to the throttle with only my right foot like normal; no more holding the brake w the left foot in anticipation of the sudden jump.  I've also noticed that as I go steady across the field it doesn't chug on and off as my foot slightly changes throttle position bumping over the bumps.  The other thing that hasn't happened yet is that I had a random backfire through the intake at takeoff.  I never nailed down the exact scenario(s) that caused it but <knock_on_wood> it hasn't yet happened w the new ECU.  And, as a last test, I took it out on the road and ran it up to 55MPH just to make sure that the mid/top end wasn't gone.  I'm not interested in finding top end

In short, I'm disappointed that CFM isn't helping folks with this under a warranty claim but since I bought it used I wasn't really in that group to begin with.  But, other than the ~$400 I had to pay for it, I am happy with the results.

Glad to hear it helped. I'm going to be taking mine in for service and will be mentioning this 'fix'

I joined this forum specifically looking to solve this problem with my new 2022 UForce 800.  Ordered the ZForce ECU, installed it yesterday, fixed the problem like everyone else has reported!  I don't know how the ECU change has had such a big impact on low RPM engagement of the CVT, but it has...

got a 2022 U800, very hard to throttle on and off the ramps like many in this forum have explained. Thought it may have been me but apparently not.

[2015 Z Force 800 53/Trail EPS]

got a 2022 U800, very hard to throttle on and off the ramps like many in this forum have explained. Thought it may have been me but apparently not.

I think the 1000s have a throttle by wire system that many found has issues with the peddle module but the 800s still use the cable which many found issues with the ECU. Some have replaces the UForce ECU with another UForce ECU to to avail and some have replaces it with the ZForce ECU and corrected the problem. Not sure what the difference is but mapping and programing must play a part.

I joined this forum specifically looking to solve this problem with my new 2022 UForce 800.  Ordered the ZForce ECU, installed it yesterday, fixed the problem like everyone else has reported!  I don't know how the ECU change has had such a big impact on low RPM engagement of the CVT, but it has...

jimogeek, What part # ECU did you order?

I ordered this:

ECU DELPHI 28250531
  - Model: 0800-174000-2000   MICF0800-174000   1   $291.13   $291.13


The vendor was in China, took a while to get the part but it was definitely worth it.

I also did the Powersports tuning route on the existing ECU since it was relatively inexpensive, can't say I see a huge difference? 

The new ECU DID make a big difference on performance, but I still had an occasional cold re-start.  The powersports tune seems to be better, I'm running that at the moment, seems to be a touch better throttle response/low RPM engagement.

I ordered this:

ECU DELPHI 28250531
  - Model: 0800-174000-2000   MICF0800-174000   1   $291.13   $291.13


The vendor was in China, took a while to get the part but it was definitely worth it.

I also did the Powersports tuning route on the existing ECU since it was relatively inexpensive, can't say I see a huge difference? 

The new ECU DID make a big difference on performance, but I still had an occasional cold re-start.  The powersports tune seems to be better, I'm running that at the moment, seems to be a touch better throttle response/low RPM engagement.

Thank you!!

Just wanted to let everyone know I am another that is happy with changing ECU to the Z force unit. Drivability is improved 100%!! No more jerking, slow speed drivability is so much better. Don't know why CF won't address this. I was lucky, I was able to get mine from my local dealer for $254 out the door. When I bought the unit, I was given a 25% off coupon to be used on anything.

[2015 Z Force 800 53/Trail EPS]

Amazing. Congrats! Yes, why won't CFM address this..two-year-old issue. Maybe because not all have this issue.

Bought a used 2019 Uforce 800 about a month ago (only 30 hours).  Love the machine, but was kind of annoyed by the hesitation/jerky starts from initial throttle. Found this thread while researching the issue, ordered the Z800 ECU #0800-174000-2000 and installed it today.  I'm a little on the fence with it.  Seems to have smoothed out some of the issues at initial throttle, but not sure it was worth the $375 price tag.  Just wanted to let others know about my experience and it may or may not make a world of difference. 

Bought a used 2019 Uforce 800 about a month ago (only 30 hours).  Love the machine, but was kind of annoyed by the hesitation/jerky starts from initial throttle. Found this thread while researching the issue, ordered the Z800 ECU #0800-174000-2000 and installed it today.  I'm a little on the fence with it.  Seems to have smoothed out some of the issues at initial throttle, but not sure it was worth the $375 price tag.  Just wanted to let others know about my experience and it may or may not make a world of difference. 

Did you order 0800-174000-2000 or 0800-174001-2000? The first one is what I HAD in mine 2nd one what I replaced it with