bruno nadeau
Expert Class
Posts: 174
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posted September 21, 2009 05:55 PM
AFR?
i made some test today and i got some surprising numbers.bike zx14 09se KN air filter no flys yosh R77 full.these 2 run were made at the same place 5 minutes between and the road is going up a little.the 2 run were take in the log well after the throttle was full.run 1:my motty was set to 12,9 afr but the map was not completty built i get number from 12.8 to 13,1 on the log(PC5 autotune recommande 13,2 to 13 target afr at full throttle, i am close) and from 70 to 150 MPH it take 7,616 seconds in 4 gear.run 2 same as above but no map at all,afr was betwenn 13 to 11,9,it take 7,744 seconds difference is.128 seconds to gain 80 mph.in my mind there is no difference.i double check it with another logger(lm2 inovate)about the same result .rpm went from 4920 to10300.i was thinking that AFR was more important than that.i also find that removing flys on a 09 dont bring the afr to lean(i made the same test in 3 gear less difference in time).what do you think.thank
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bruno nadeau
  
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Wheelie
Needs a life
Old Man
Posts: 6902
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posted September 21, 2009 05:56 PM
quote:
i made some test today and i got some surprising numbers.bike zx14 09se KN air filter no flys yosh R77 full.these 2 run were made at the same place 5 minutes between and the road is going up a little.the 2 run were take in the log well after the throttle was full.run 1:my motty was set to 12,9 afr but the map was not completty built i get number from 12.8 to 13,1 on the log(PC5 autotune recommande 13,2 to 13 target afr at full throttle, i am close) and from 70 to 150 MPH it take 7,616 seconds in 4 gear.run 2 same as above but no map at all,afr was betwenn 13 to 11,9,it take 7,744 seconds difference is.128 seconds to gain 80 mph.in my mind there is no difference.i double check it with another logger(lm2 inovate)about the same result .rpm went from 4920 to10300.i was thinking that AFR was more important than that.i also find that removing flys on a 09 dont bring the afr to lean(i made the same test in 3 gear less difference in time).what do you think.thank
put it on a drag strip. hehehe
wee
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eklipse636
Needs a life
ZX-14
Posts: 6046
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posted September 22, 2009 02:42 AM
That's what I said whith mine, but I don't put the mph down at the track as to when I did have a pc. I don't understand it either, and no one here never gave me a answer.
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Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
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bruno nadeau
Expert Class
Posts: 174
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posted September 22, 2009 05:55 AM
quote:
That's what I said whith mine, but I don't put the mph down at the track as to when I did have a pc. I don't understand it either, and no one here never gave me a answer.
is that mean that a custom map did about nothing on a relatively stock zx 14 09????
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bruno nadeau
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bruno nadeau
Expert Class
Posts: 174
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posted October 10, 2009 06:40 PM
i got an answer from a general tuning forum  Engines with sufficient vaporization and burn efficiency don't need to run 12.8 AFR. When presented with an engine that goes the same at different AFR's its indicative of good vaporization and homogenization of the charge. I have seen on engine dynos an engine make exactly the same HP and torque at all AFR's tested from 14.2 to 12.6. Thats proper testing with timing alterations, cam timing alterations in between etc. All that extra fuel at the richer AFR's did was waste fuel).
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bruno nadeau
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