Off idle stumble 2014 Cross Country with PCV and AT - Victory Forums - Victory Motorcycle Forum
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post #1 of 47 (permalink) Old 06-14-2015, 10:30 AM Thread Starter
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Default Off idle stumble 2014 Cross Country with PCV and AT

Hey all, I'm working on attempting to eliminate an off idle stumble that my 14 XC is suffering from. This is not a "blip the throttle" stumble, although you can make it do that too. This happens periodically (no really set pattern) once the engine is hot. I'll pull up to a light and wait for a bit, and when I ease into the throttle to clutch out in first hear, the bike will hesitate and *almost* stall. This happens when the bike is hot, and not very often, but enough to be annoying.

My mods are as follows:

Stock ECU (no stage 1 flash)
Vic performance filter
Witchdoctor baffle muscle mufflers
PCV with AT


Now, just so you all know, it was doing this *before* the PCV and AT. Now that I have the PC, I am looking for a way to tune that issue out. I have played with several different AFR tables (a couple from members here), but for simplicity sake, I'm currently running the bit too rich dynojet AFR tables. This allows me to compare to my friends 13 XC with a PCV and AT. He doesn't seem to have this issue, but he started with a stage one flash *before* he went PCV and AT.

The PCV and AT took care of all of the low RPM and low speed lean surges that the stock ECU suffered from, so I am happy in that regard. Right now I am just trying to learn more about the PCV and AT to see if I can correct that issue. So far what I have done, which seemed to help, was input AFR's into the 0 throttle column from 500 RPM to about 1750 RPM, and I also put AFR's into the 750 RMP row up to about 20% throttle. This seems to have helped, but didn't eliminate it entirely. In checking the trims I don't see much activity in those cells, so I'm not sure if that is the real issue.

What I am trying to figure out is what actually causes the stumble? Is it caused from being too rich at one point and then leaning down too fast when throttle is applied, or is it the other way around?

I'm looking for anyone who has just a PCV or a PCV with AT who is familiar with this issue and was able to solve it.
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post #2 of 47 (permalink) Old 06-14-2015, 10:54 AM
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I have the same problem. Very intermittent.
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post #3 of 47 (permalink) Old 06-14-2015, 11:09 AM Thread Starter
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^^ Frustrating...ain't it.

The thing is, this isn't new, I had the issue pre PCV as well. It just seems to be *more* intermittent now.
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post #4 of 47 (permalink) Old 06-15-2015, 08:24 AM
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Why dont you post your tables and i can take a look at them.
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post #5 of 47 (permalink) Old 06-15-2015, 09:09 AM
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No Lloydz timing wheel?
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post #6 of 47 (permalink) Old 06-15-2015, 09:22 AM
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Quote:
Originally Posted by Travis P View Post
No Lloydz timing wheel?
^^^ This^^^ helped a lot with my stumble prior to my mods.

2011 vegas 8ball PCV, swept pipes rpw modified baffles, llyodz vm1-dr cam, ats +4, 1/4 throttle, ud pulley and ness intake.
KMC tuned 114hp/125ft/lbs
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post #7 of 47 (permalink) Old 06-15-2015, 09:27 AM
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Get the timing wheel set it at +4 and ride the wheels off that unit!!!!
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post #8 of 47 (permalink) Old 06-15-2015, 11:49 AM
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bskouby

where do you live?

If it were me I would write Rylan at the vic shop and ask for a truly good program. Even if he charges for it that stop all the frustration.
Rylan only does thousands of dyno tunes and is very helpful man.

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Please add your state and model of bike you have. Click user CP @ top of page and then far left click edit signature. Thanks
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post #9 of 47 (permalink) Old 06-15-2015, 12:52 PM
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Mine does the same still and I have a timing wheel at +4.

2014 XC - Pearl White - 16" Ape Hangers, LED Headlight, Lloydz Timing Gear @ +4, SharkHonker Exhaust, PCV, 1/4" Turn Throttle Ring, Hard Lowers, Keyless Ignition, Lloyd's Intake, Klockwerk Shield
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post #10 of 47 (permalink) Old 06-15-2015, 01:49 PM Thread Starter
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I'm in Southern Illinois. I'm a fairly good clip from a tuner, so I wasn't planning on a dyno yet...until I finally solidify all of my mods.

I do not yet have a timing wheel, that is probably the next mod time/money allowing. I might just reach out to Rylan and see what he would say. He is in Iowa, which is about an 8 hour trip for me.

As for the maps, I have played with three different AFR tables. One is the stock dyno jet table that comes with map M19-009-006, one is AFR table is from the other forum and was posted by dtml, and the final was a AFR table given to me by Drew Miller. I don't want to post that on here without his permission.

That being said, with the dtml table and the miller table I started with a zero map and built from there. They both had the off idle stumble. I then went with the dynojet map with the richer AFR's, and I based it off of the 006 map which was closest to my setup. This seems to run pretty good, less stumbling off idle, but still not great.

I attached the dtml ARF table I used to build a map. I only ran this for a very short time, so I don't have a good map to share. I felt that this setup was a bit too lean and I didn't like how the bike ran.

I also attached the most recent AT build of the dynojet map/AFR table I am using. I added the low RPM AFR's to try to calm down the off idle stumble. It helped, just didn't eliminate it.
Attached Images
File Type: jpg dtml afr chart.jpg (68.7 KB, 16 views)
Attached Files
File Type: zip dynojet-M19-009-006-modified-run1.zip (972 Bytes, 14 views)
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