| Author | Message | ||
     Nopork |
Now that it has been a while since some of us have run with the exhaust valve wired open I was wondering what others have found as pros and cons to this. It seems on mine that my oil temperature appears to run a little hotter with it wired open, but it could be the ambient air temperature being warmer than when I had run with it closed. One would think that is should go the other way. Anyone else notice anything problems other than a little loss of mid range and the valve at the muffler stuck open as in a prior post. Just wondering what others have found and how many have switched it back to the stock configuration or left it wired open. | ||
| Andrejs2112 |
I had mine open on accident. I did notice a midrange loss of power that drove me nuts. I'm glad I realized that the valve was open and was able to close it. I'll trust the engineers on this topic. Stock works for me. | ||
| Rwcfrank |
I went back to stock, I liked the mid range too much..I wish I could have both but I am sure Erik does too!!! | ||
| Rydr |
I'm running with my exhaust valve open and a K&N filter. I like it, the Uly runs great and I don't have a problem with the mid range at all. | ||
| Dick_stilton |
Iv been running with mine wired open for a couple of weeks. I did this in conjunction with installing a Pipercross filter and modeling my 06 airbox on an 07. Bike runs much better and sounds just right. I'm staying with it. | ||
| Kvdog |
I'm running mine closed most of the time but have a crude set-up for opening it manually for better off-idle behavior when cold and when slow running in loose gravel/sand fire lane conditions--greatly cuts down on the need for slipping the clutch. | ||
| Growl |
Kvdog: makes sense to me... even better would be to leave the valve stock but add a switch to power the actuator on demand - for slow running in gravel | ||
| Kvdog |
I tried fooling around with some lever arrangements to provide a manual control, but couldn't come up with quite what I wanted or a good place to mount the lever, so I am just holding the cable in the open position with a small clamp for now, as needed. If one chose to sacrifice the automatic actuation of the valve completely, something as simple as an old style manual choke control (push/pull), attached through a small hole drilled into the airbox would probably work pretty well. | ||
| Americanmadexb |
would a 12 pipe fit on a 9, as long as you wire the valve open? | ||
| Lovehamr |
I'm using the Race kit and it's so much better than stock it's unbelievable. Good computer tune, good filter and no valve.  Steve | ||
| Johnboy777 |
Mine is still wired open - the only reason being better slow speed response (driveability). To me, it's worth it for that benefit alone. It does sounds a little better, as well. Whether or not I'm giving up any mid-range... seems probable, but I really don't know, and don't care. . | ||
| Pso |
my Uly and Finace's Scg both still wired open. I like the low speed handling and she likes the sound of her bike now. | ||
| Werewulf |
my 08 runs like poop at low speeds.. anyone wired open an 08 model? im curious if it would help.. | ||
| Blk_uly |
Werewulf You need the 08 re flash. Mine was completely de-pooped. It runs way better than before, the only thing you have to lose is speedo accuracy who cares see the thread called 08 uly beta-patch its for all 08 x bikes I thinketh (Message edited by blk_uly on July 22, 2008) | ||
| Werewulf |
i had the reflash and it did nothing...others i have talked to, said they could tell very little difference either... | ||
| Sekalilgai |
Hmm so anyone tried using ECMSPY to do this? It looks like in stock configuration, the servo motor only kicks on in WOT. However, there is a 3-region AMC 'map' that apparently permits one to set an ON-OFF-ON behavior for the servo. Looks like the loaded values are 1450/1500: on 3300/3350: off 5050/5100: on It is just that the configuration bit is disabled (0x204). i.e. 0x99 instead of 0x98 Perhaps I'll be the guinea pig. With my idle set as per TM's approach, I'll have to bring the lower endpoint down a bit. The idea is not all mine, see http://www.ukbeg.com/modules.php?name=Forums&file= viewtopic&p=381156#381156 | ||
| Johnboy777 |
""Hmm so anyone tried using ECMSPY to do this? "" What a great idea - you could open it up for idle and for slow speed response, then have it go back to normal operation. . | ||
| Sekalilgai |
Hey there Johnboy I just tried the mod via ECMSPY and it apparently does work. The low speed tractability does (by the butt anyway) feel improved. I changed 0x204 to 0x98 (from 0x99) and lowered the threshold for the first region (cut it in half). As changed, the AMC valve stays open from idle up to 3k and then it closes until a little over 5k. (where it opens up again) From what I can tell, when you crank open WOT, (and RPM below 5k), the valve still opens up. The bike does sound a little more 'rattly' at idle tho, guess it is a worthwhile tradeoff for around-town luggable improvement. The actuator isn't the speediest thing in the world but seems pretty well matched to the rate at which I typically accelerate. Another tweak thanks to Gunter/Ralf again  | ||
| Growl |
Sekalilgai: That is exciting! However, a potential trade off is that you might be giving up torque at low rpms. If you are dirt riding and climbing a very steep hill where you need to negotiate around obstacles - slowing down to idle rpm will it now stall? In stock config you might be amazed at how the thing will just keep on chugging. | ||
| Sekalilgai |
... even better would be to leave the valve stock but add a switch to power the actuator on demand - for slow running in gravel You're right but I am guessing that is the same tradeoff that dispatches the clutch-slipping-low-speed-about-town behavior in the stock configuration. A few months back, I first used TM's 'square idle' which (in spite of one's notions about how closed loop operation should work) brought the usable RPM range down below 3k. Correspondingly, the wire-the-muffler mod seems to show improvement off-idle. Combine the two and it is not too bad. I rode around the same two blocks a number of times both with and without the AMC enabled....and could tell the improvement. I am not sure why it was disabled in stock configuration. Maybe it was emmisions related or perhaps the actuators are not durable enough for the duty cycle. There is hysterisis set/available for threshold to transition the regions which might help. However the 'default' time latency settings were both 0. It does not appear that the output from the AMC feedback pot is logged via ECMSPY. I'll ride a little more and maybe rig something up (at the expense of BAS!). All in all, a nice little experiment.... and an option for the guys 'hardwiring' their valve open. Anyone want to sell me a muffler actuator cheap?  (Message edited by sekalilgai on July 23, 2008) | ||
| Rydr |
Had mine wired open on my 08 Uly. I run a K&N filter and have the lower gearing in the primary (XB9). It works well and I didn't notice any significant torque loss. I'm trying a different approach. I adjusted the exhaust valve cable so that it would not close the exhaust valve fully but still actuates the valve to fully open. That way the actuator and the valve are still being cycled and I get the benefit of the valve never fully closing. I'll post after a few runs as to how well it works. | ||
| Chas1969 |
Hello, I just tried the wired-up valve after the servo bit the dust and WOW what a difference. I also cleared the code, & turned off the servo with Spy. I like the smoothness, did I say smoothness how about smoooooothyness. low speed especially and mid-high some. I do not feel a loss in the mid-range but this maybe because it feels that it spools up faster and feels more respondsive. I think it is a keeper as a mod. With K&N filter and reseting AFV to 100% the bike is running awesome!!! To see is how the AFV adjusts to with new exhaust. Past AFV was 90%. Chas | ||
| Dick_stilton |
"I also cleared the code, & turned off the servo with Spy." Hi Chas. Can you tell me how to do this. I want to do this.I am going along to a guy with spy on monday. Thanks Dick | ||
| Electraglider_1997 |
Rydr, Your method sounds interesting. Keep us posted. | ||
| Chas1969 |
On ECM spy under "diagnostics" (something close) tab or window their is a Active Muffler Control and check no then burn. Then you can make sure it is off with trying diasnositic function with the AMC. At the bottom is a read function and clear function for codes. Good Luck! Chas PS: Update- My AFV still at 100% so no change but AFV seems funny this way... takes 40+ miles for my to change. After AFV resets/adjusts then I will report on the MPG. Still will take time for full eval. but what MPG's have everyone else getting?? | ||
| Curly |
my '07 mpg's did not change. been running wired open for several weeks and still getting about same milage as when running stock. | ||
| Sekalilgai |
After 900 miles, this mod works nicely. I did it via ECMSPY but otherwise same results. Most of the miles were done at Interstate speed with tach reading 3500 or so in balmy mid 80s weather. Typically I get about 44-45mpg but recorded 48-49 on this trip (with camping gear). I did reset AFV before departing and it showed 99.6 last night and there have been plenty of opportunity for the ECM to run in closed-loop. Low speed chug-chug still appears intact, I spent about a half hour in traffic with the bike often idling in 1st and sometimes dragging the rear brake. | ||
| Growl |
Sekalilgai: You did what with ECMSPY? Deactivate the valve? Is it wired open? | ||
| Chas1969 |
My AFV reset from 100% to 95% (compared to 90% before wire open). May be in a week or two it will closure to 90%, but not to far off pre-wire-open. Fuell mileage about the same. Idle and nice spool-up with power ... not bad Chas | ||
| Sekalilgai |
Growl I used ECMSPY to change configuration byte at address 0x204 from 0x99 to 0x98. The default configuration on my ECM was to enable the servo only under WOT conditions. Changing the bit enables the servo within certain RPM ranges (while still complying WOT conditions). The servo is open from idle to about 3.3k and closed from there to 5k and open beyond that. The valve is not deactivated but is 'wired open' so to speak in those RPM ranges. My AFV prior to the mod was around 97% and is currently (after 1k) at 99.6%. |
