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| AFV question https://ukbeg.com/forum/viewtopic.php?f=8&t=11888 |
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| Author: | DrBuella [ 05 Aug 2011 11:08 ] |
| Post subject: | AFV question |
I'm trying to understand what an AFV reset actually resets to. Does it take the current value and make that the new baseline (ie 110% becomes the new 100%) figure or does it take it back to the figure it was when it left the factory (presumably 100% but would be a different fueling to the 100% above) Does this question make any sense? Am I going mad? |
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| Author: | pash [ 05 Aug 2011 11:37 ] |
| Post subject: | Re: AFV question |
AFV is a factor applied to the open loop areas of the map, calculated in the closed loop learn area. Resetting it just means you set it to 100% and the open loop area has no correction applied. Waste of time cos as soon as the engine goes into closed loop learn area of operation the ECM will set it to what it wants... |
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| Author: | kevmean [ 05 Aug 2011 11:55 ] |
| Post subject: | Re: AFV question |
Yep what Pash said ......... it doesn't need to be at 100%........... it is just a starting figure so changes to exhausts and intakes etc will mean it finds it's own new value............ handy to have a rough idea what it normally runs at on your bike as it could then give you an indication of problems if it suddenly changes value a lot without any changes being made to the bike 
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| Author: | DrBuella [ 05 Aug 2011 16:03 ] |
| Post subject: | Re: AFV question |
pash wrote: Waste of time cos as soon as the engine goes into closed loop learn area of operation the ECM will set it to what it wants... This is the bit I find confusing- If it is running at 110% and I reset it back to 100 and it then decides it needs to make adjustments again (assuming nothing has changed on the bike) it would surely not drift all the way back to 110%- would it not be nearer where it needs to be? |
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| Author: | pash [ 05 Aug 2011 16:11 ] |
| Post subject: | Re: AFV question |
110% may be where the ECM wants it to be. The ECM can raise as well as lower the AFV. It is not something that goes out of cal like TPS... |
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| Author: | kevmean [ 05 Aug 2011 17:29 ] |
| Post subject: | Re: AFV question |
DrBuella wrote: pash wrote: Waste of time cos as soon as the engine goes into closed loop learn area of operation the ECM will set it to what it wants... This is the bit I find confusing- If it is running at 110% and I reset it back to 100 and it then decides it needs to make adjustments again (assuming nothing has changed on the bike) it would surely not drift all the way back to 110%- would it not be nearer where it needs to be? The 100% you set it to each time is the same 100% that it was set to at the factory .........your 110 does not become the new 100
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| Author: | DrBuella [ 05 Aug 2011 20:27 ] |
| Post subject: | Re: AFV question |
Thanks chaps, that answers my question. |
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| Author: | chris(madrid) [ 06 Aug 2011 08:01 ] |
| Post subject: | Re: AFV question |
pash wrote: It is not something that goes out of cal like TPS... Must be e VERY special Lambda probe then. I'm still learning this electroniky malarky.
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| Author: | pash [ 06 Aug 2011 08:41 ] |
| Post subject: | Re: AFV question |
You missed my point Chris, there is no need to reset the AFV to 100% as you would do a TPS reset. Unless of course you were disconnecting the O2 sensor. |
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| Author: | chris(madrid) [ 06 Aug 2011 15:17 ] |
| Post subject: | Re: AFV question |
pash wrote: You missed my point Chris, there is no need to reset the AFV to 100% as you would do a TPS reset. Unless of course you were disconnecting the O2 sensor. I've been reading about WB-O2 recently and some of those go "off" fairly fast. Sorry  - yeah - I know it's NB.
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