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Buell Motorcycle Forum » Old School Buell » Archive through October 02, 2008 » Setting AFV with spy « Previous Next »

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Mrsinister
Posted on Monday, September 29, 2008 - 10:08 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I figured out the TPS reset with no problems but the AFV is still a little gray to me. Should the bike be warmed up and if so what is a good engine temp to set this setting at. Should the bike be running or off when you set this setting?
I may be doing a TPS reset later this week and thought I might do the AFV at the same time. Let me know how it is done right guys.
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Scott_in_nh
Posted on Monday, September 29, 2008 - 11:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It won't matter whether the bike is warmed up or not.

The ECM "remembers" the AFV value that it last calculated.

100% runs right off of the fuel maps, 105% would add 5% to all fuel map values, 95% would take away 5% from the fuel maps, etc.

If you TPS value had drifted off a bit then the AFV tries to compensate.

So when you reset the TPS it is a good idea th reset the AFV so that the ECM gets a "fresh start" at adjusting the air/fuel ratio for the current conditions in your part of the world.
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Mrsinister
Posted on Monday, September 29, 2008 - 01:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I see. In watching my plugs the bike looks just a touch lean to me. That is why I was asking. I didn't think it had to be warmed up or anything. I will look at the value it currently has in there and see where it is at. I just loaded the race ECM program a short time back but that isn't the source of the problem as the plugs looked the same before the ECM change if not a little worse. I actually think the ECM change helped but I still see a small amount of white on the rear plug I will pull both look them over and start tinkering from there.
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Jos51700
Posted on Tuesday, September 30, 2008 - 08:03 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The O2 sensor is way more accurate than your spark plugs. Learn to trust the sensors, and use them to guide your mapping changes. A wide-band o2 sensor with it's requisite software is an excellent tuning aid.
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