Correlating Evoscan Fuel Trim to OBD-II LTFT
#16
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the higher the duty cycle, the less effect it seems to have.. its just at very low throttle inputs where there is very low injector duty where this makes the most difference.. at least from my experience.. It does have some effect, just not as critical that it will throw off your tune completely if you alter it to get your trims in check, at least for the small adjustments necessary..
#18
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Originally Posted by hondafan
i just didn't think al's map would throw them of by over 10 being that i'm on stock injectors with minor bolt-ons, i figured they'd be a little closer.
#19
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If you want to be really on the safe side when you change any of your fuel settings, then (assuming you have a working wideband gauge and sensor) throw some racegas in it and log the difference in AFR - that's how I'm tuning my AFRs. Once I have them where I think they should be, I switch back to pump gas and make sure that there is no knock.
l8r)
l8r)
#20
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Originally Posted by Ludikraut
If you want to be really on the safe side when you change any of your fuel settings, then (assuming you have a working wideband gauge and sensor) throw some racegas in it and log the difference in AFR - that's how I'm tuning my AFRs. Once I have them where I think they should be, I switch back to pump gas and make sure that there is no knock.
l8r)
l8r)
Eric
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I use 100 Oct unleaded (usually mixed with 1/8 tank of 93) and I only use it for two things as far as fueling goes:
1.) to understand the relationship between the AFR target number and the actual AFR
2.) to get the tune to a safe number (e.g. 10.9 AFR), but have a good safety margin in case of a typo or f'up on my part
l8r)
1.) to understand the relationship between the AFR target number and the actual AFR
2.) to get the tune to a safe number (e.g. 10.9 AFR), but have a good safety margin in case of a typo or f'up on my part
l8r)
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ecktt
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May 8, 2017 06:18 PM