| Author | Message | ||
     Jessemc |
I spent four days over the past weekend riding in West Virginia, Kentucky, and Virginia. The Uly ran like a top, lots of fun in the tight twisties, great gas mileage, comfortable for 400+ mile days back to back and I was really glad I installed the shroud from the comfort kit before I left - the fan ran a lot but the boys stayed cool. It was almost perfect. The one area it lacked is in engine braking - tight steep downhill turns required more brake application than I like to do since the engine has practically zero engine braking - much much less than my sv650 where the throttle almost acts like an on-off switch but also much less than my vx800. My riding style is to use the throttle to setup corner entry speed and keep off the brakes it at all possible. The XB9 primary conversion is probably in my future but I'm also interested in hearing if anyone has experimented with modifying the ecm. I saw one thread about using the Deceleration Fuel Cut-Off (http://www.badweatherbikers.com/buell/messages/327 77/368919.html?1213567176) but there's not enough information to draw any conclusions. My bike is a bone stock '06 and I have ECMSpy and the cable. | ||
| B00stzx3 |
I'd be careful about messing with that setting, might wanna ask Xopti (think his name is Tom??) first. Have you consulted the ECMSpy guide about the Decel cut off? | ||
| 1_mike |
It because of the massive flywheel that there is little engine braking. That thing want's to spin for ever. That's also why clutchless shifting the XB's isn't smooth till the higher gears...that big ol flywheel just wants to keep spinning. Mike | ||
| Rsh |
What is your idle speed set at. Some of the XB's when the idle is set at the spec 1050rpm do not return to idle very quickly and tend to linger at 1700 to 2000rpm range for a second or two before returning to the 1050rpm range. Maybe you are getting that lingering effect and that is limiting your feel of engine braking. Try setting the idle at 950rpm hot, then see how the engine braking feels. | ||
| Glitch |
What is your idle speed set at. It ain't that, it's a light weight small displacement engine, that once you stop giving it gas damn near stops, against an engine with nearly twice the displacement, and probably twice the rotating mass. No contest. An XB12 can't spin down that fast. For some fun, hop on an inline 6 and try some engine braking. Whole different animal all together. | ||
| Ducbsa |
Without proper technique, engine braking means future clutch maintenance vs. cheaper brake work. One of the things I like about my XBS is the fabulous brakes, so I don't have to use the engine like on on my 1950 Brit bike. | ||
| Jessemc |
B00stzx3 - Have you consulted the ECMSpy guide about the Decel cut off? I'm probably missing something and I cannot say I read it all and absorbed it, but I only see the Decel Table mentioned once. It is mentioned in passing in the context of modifying the Decel Table there rather than in Zones 2 and 3 (Closed Throttle Overrun and High Speed Closing Throttle (Tuning Guide 1.6 p 30)) Couldn't see any mention of what parts of the map represent the Decel Table. 1_Mike - because of the massive flywheel that there is little engine braking. and Glitch - It ain't [idle speed], it's a light weight small displacement engine, that once you stop giving it gas damn near stops, against an engine with nearly twice the displacement, and probably twice the rotating mass. Accept that it won't spin down nearly as quickly as the sv but it seems that it might be possible to adjust the fueling so that the revs drop off more quickly than they do at present via some adjustment of Deceleration Fuel Cut-off or some other modification. The point about not messing with these settings is well taken. Rsh - Some of the XB's when the idle is set at the spec 1050rpm do not return to idle very quickly and tend to linger at 1700 to 2000rpm range for a second or two before returning to the 1050rpm range. Maybe you are getting that lingering effect and that is limiting your feel of engine braking. Try setting the idle at 950rpm hot, then see how the engine braking feels. Idle is set at 1050 and it does linger before dropping down. Setting idle speed to get a desired level of engine braking is common among vx800 owners, definitely worth a try. Still interested in hearing about fueling solutions. Thanks to all for the comments and insights so far. | ||
| Petebueller |
I think the XB resist engine braking by maintaining fuel during decel. If you reduce this I think you will increase engine braking. It isn't what I would want to do but something I've considered when looking at the difference in engine braking between my Firebolt and a VTR. |
