Dyno Numbers

[SJCOPE13]

Mike,
I am new to the forum. I have an 07 Street Bob. I just added the SE Race Tuner, Stage 1 A/C and Vines and Hines Straightshots Slip-ons with Quiet baffles. The shop dyno'ed it for me and alot of people are telling me it's too lean and others 0sa1y it's fine. Can you look at my chart and tell me if I am going to be ok riding my bike or do I need to ask them to redo it/ Thanks.

[SJCOPE13]

I am trying to attach the dyno sheet. From what others have said, it's all jacked up.

[Mike]

The dyno chart only reflects wide open throttle (WOT) and so only about 10% of the range the motor will see. Part throttle and varying load/rpms are the remaining 90% not shown. Also, numbers below 2.5 are not shown and these can be helpful in tuning. Your chart shows very lean at about 2k with a significant wave in the curve overall going lean again at 5k. Since this is WOT, it should be right on the 13.2 AFR line all the way across with the exception of a little wiggle right at the beginning, when the throttle is suddenly opened for the run sample (stock AFR's at WOT are often around 13.3-13.6 and very flat). With your conditions at WOT, it makes one question what the values are in the remaining table areas (the other 90% of the operating range). It will be the steady state, heavily loaded areas (not represented by the graph) that can do the harm to the motor if run in those areas for extended periods (traveling/touring). If a tuner is struggling with correcting the WOT 10% area, then it would be safe to assume they are equally struggling with the rest of the tune in those areas requiring dyno load control and part throttle sampling. Sorry, but it really needs more work. Good news is, once corrected, you'll have better drivability and dyno numbers overall.
Let me know how all works out.
Thanks, Mie

[SJCOPE13]

Mike,
Thanks for the information. I apreciate it. Others have told me also I have serious problems going on and shouldn't even ride my bike. Thanks for your expertise.