greasemonkey wrote:
,,,any angle from 90 degrees vertical,,
'My bike was running so lean that I am nearly touching the floor'
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| Exhaust Dilema https://ukbeg.com/forum/viewtopic.php?f=7&t=15378 |
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| Author: | Joth [ 29 Aug 2012 12:52 ] |
| Post subject: | Exhaust Dilema |
I have a Buell XB12XP which I commute to work on every day which has had a Stealth Exhaust fitted before I purchased the bike and I don't think it has any adjustments to the mapping. The bike runs ok, it pops and bangs (less popping if I do a TPS reset) but sounds great for small rides, but gets a little anoying when riding every day. The problem it has is when riding through traffic at 30 to 40mph at between 2000 -3000 revs you can feel it keep holding back slightly then trying to smoth out then holding back again etc. etc., (feels like it wants to go but can't ... possibly lean mixture ?) but as soon as you accelerate and in the higher revs it is very responsive. The engine also seems to be running hot which causes problems on long rides as it looses power then picks up on the slower parts of the ride etc. etc. I guess the ECM is also trying to learn so any changes to the mapping will be adjusted anyway (but only by a percentage?) don't know if this can be switched off. There are a few options : 1) Keep the exhaust and try to adjust the mapping with ecmspy etc. (ordered cable just in case). 2) Have the stealth exhaust moded to replicate closer the standard exhaust. 3) Fit the original exhaust and actuator cable (which was given to me with the bike.) 4) Fit a 3rd party Fuel Tuner (Power Commander type etc.) 5) Buy and fit a new exhaust which does not need any ecm mods (if available) Any thoughts, Joth |
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| Author: | sportster_mann [ 29 Aug 2012 13:53 ] |
| Post subject: | Re: Exhaust Dilema |
All Buells run lean from the factory to get through emissions testing - yours probably also has the narrower headers as it's a later model, and restrict the engine further. Better to swap out the ECM for something that is programmable, as I'm not sure if ECMSpy can help on later stock ECMs ... http://www.erikbuellracing.com/store/pa ... ction.html ... I'm probably going to get shot down in flames now. |
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| Author: | carol18 [ 29 Aug 2012 18:41 ] |
| Post subject: | Re: Exhaust Dilema |
sportster_mann wrote: All Buells run lean from the factory to get through emissions testing - yours probably also has the narrower headers as it's a later model, and restrict the engine further. Better to swap out the ECM for something that is programmable, as I'm not sure if ECMSpy can help on later stock ECMs ... http://www.erikbuellracing.com/store/pa ... ction.html ... I'm probably going to get shot down in flames now. Agree with you |
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| Author: | pash [ 29 Aug 2012 18:54 ] |
| Post subject: | Re: Exhaust Dilema |
What is lean? |
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| Author: | pash [ 29 Aug 2012 19:09 ] |
| Post subject: | Re: Exhaust Dilema |
greasemonkey wrote: ,,,any angle from 90 degrees vertical,, 'My bike was running so lean that I am nearly touching the floor'
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| Author: | Davsag [ 30 Aug 2012 20:59 ] |
| Post subject: | Re: Exhaust Dilema |
I recently fitted a stealth on my uly, I filled up with esso super unleaded and the popping and banging has all but disappear. The bike also feels a little more responsive. |
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| Author: | Joth [ 31 Aug 2012 13:38 ] |
| Post subject: | Re: Exhaust Dilema |
Hi Decided to change the exhaust back to stock, the old exhaust will need a little cosmetic work, but it will return the bike back to the way it was designed originally. Also I will not need to keep fiddling around with the ECM or have the need to add on a fuel module etc. etc. There are only around 125 made of this model apparently, so this may be good for the future resale value in early 2014 when the warranty runs out. I may suffer a little with the performance but at least I will not be commuting through the built up areas popping and banging away with every one looking bemused at the noise the bike is making. Thanks for your input. Joth |
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| Author: | pash [ 31 Aug 2012 14:02 ] |
| Post subject: | Re: Exhaust Dilema |
People fit stainless exhausts for three reasons, firstly cos the standard exhaust is going rusty, secondly cos they want to go faster and thirdly to make noise. Popping is easy to fix, I have written numerous posts on this. The hesitancy is a Buell header length thing, they all hesitate at around 3k to some extent, even with the standard pipe. Your engine will not be running lean at part throttle as it it has O2 sensors in the front and rear cylinders, so it will be controlled to stoichiometric, which is good. To go open loop, the throttle needs to be significantly open. Fixes for hesitancy need to consider ignition timing. My Firebolt has different headers and does not suffer from hesitation. Your overheating issue needs more explanation to suggest a solution. |
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| Author: | DrBuella [ 01 Sep 2012 11:46 ] |
| Post subject: | Re: Exhaust Dilema |
Joth wrote: Hi Decided to change the exhaust back to stock, the old exhaust will need a little cosmetic work, but it will return the bike back to the way it was designed originally. Also I will not need to keep fiddling around with the ECM or have the need to add on a fuel module etc. etc. There are only around 125 made of this model apparently, so this may be good for the future resale value in early 2014 when the warranty runs out. I may suffer a little with the performance but at least I will not be commuting through the built up areas popping and banging away with every one looking bemused at the noise the bike is making. Thanks for your input. Joth This might fix the popping and banging but will it fix the hesitancy? |
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| Author: | chris(madrid) [ 01 Sep 2012 15:31 ] |
| Post subject: | Re: Exhaust Dilema |
pash wrote: People fit stainless exhausts for three reasons, firstly cos the standard exhaust is going rusty, secondly cos they want to go faster and thirdly to make noise. S3T owners of course had Factory fitted stainless to start with.  They gutted them or stuffed a V&H on. 
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