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Buell Forum » 1125R Superbike Board » Archives 001 » Archive through January 24, 2011 » Buell 1125 and power commander + autotune issue « Previous Next »

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Guilhem0018
Posted on Wednesday, January 19, 2011 - 10:53 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hello,

When I read my AFR values of the autotune sensors the AFR values are different between front and rear cylinder.

Front cylinder value are higher: about 0.5 to 1.5 higher
Is it normal or Have I an air leak somewhere. I have already check exhaust and no air leak.

If this difference is not normal, what could be the root cause? Spark issue? Valve clearance? Intake air leak (but no engine issue)

Thank you for your help
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Jules
Posted on Wednesday, January 19, 2011 - 01:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It's not unusual to see a difference between front & rear values. Check the AFV readings on ODIS and see if they have a corresponding difference..
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Curve_carver
Posted on Wednesday, January 19, 2011 - 08:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I heard the autotune constantly seeks feedback from o2s. One minute it will run strong and the next its sluggish. Someone posted awhile back that when you feel the bike runs strong disconnect the autotune and disable your 02s.
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Guilhem0018
Posted on Thursday, January 20, 2011 - 10:12 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ok the difference is mainly located below 5000 rpm and low charge

Above it is quite consistent and reliable
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Gsxrguy
Posted on Thursday, January 20, 2011 - 12:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

could be from the manufacturing tolerances of the injectors.
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Stevek1125r
Posted on Thursday, January 20, 2011 - 03:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

From my experience, you use the auto tune to make the corrections that are needed, and then disable it, other wise it will hunt and keep making changes.

Leaving the autotune on, never helped me... using it for a while and then disabling it did..
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Guilhem0018
Posted on Thursday, January 20, 2011 - 05:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

in fact once the main parameters (trim) have been found it only proposes very small changes (+/-1%) so seems ok
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