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Discussion Starter #1
Hi all. Just received the dyno graphs for my 910s from my tuner. Mod's include Arrow midpipe, BMC airfilter & power commander. The blue line represents these mods before custom mapping took place. I did not however get an A/f graph, but can report that originally the bottom end was very lean, presumably to meet emission laws & the rest of the range was overly rich. By richening up the bottom end, he has eliminated the dreaded lightswitch throttle & leaning off the upper ranges has benifited fuel consumption and performance.
Seat of the pants stuff now means the bike is an absolute pleasure around town with smooth throttle response & no more surging at constant throttle.

The power delivery has changed a bit at the expense of some bottom end. Not a bad thing though, as memories of the 750s came back. Sound wise also reminded me of the 750s some more. Sweet!! I thought. Then you realise how damn linear and controlable the power & torque is. For every bit of throttle twist you get that same percentage in forward motion and was so easy to modulate at a recent track day I did. I actually had the 750s unhooking the rear tyre more than the 910s due to it's sharper characteristics.
As for the graphs: The dyno is a dynojet 250/188. The runs conducted were all SAE corrected which takes into account climatic conditions for repeatable results & are the most accurate & believeable results supposedly.
The final graph shows an overlay of my 750s vs 910s, with exactly the same mods, the same dyno, tuner, technique etc.
Both bikes were subjected to the hard break in school of thought. Whether or not this is best, the numbers of both bikes seem to be at the good end of scale.
Needless to say, I'm very happy on all levels :blah: :blah: :blah: :blah: :blah: :highclap: :highclap:
 

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Discussion Starter #3
ks9mm said:
I dont' get it...

the attached graph is before the midpipe and after midpipe? but no Powercommander?
ks9mm, Both lines represent Arrow midpipe, BMC filter & power commander. The red lines indicate the performance gains made by custom mapping of the power commander alone.
 

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721 said:
ks9mm, Both lines represent Arrow midpipe, BMC filter & power commander. The red lines indicate the performance gains made by custom mapping of the power commander alone.
now it makes sense!!

thanks!
 
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