Idle afr is too rich help needed.

flash

.040 Over
Joined
Aug 15, 2015
Messages
56
Location
Perth Western Australia
Ride
yamaha prohauler
Hi im trying to get my idle mixture to run leaner it sits on 11.01 to 1 . I have tried to adjust the F tables but no difference. I have read up on what i could find on the net , it mentions adjusting the L tables or eliminating the L tables all together . I have tried working out how to do this on tuneecu but have had no luck. Im hoping someone can help me out here. I have eliminated the O2 sensor and im running a turbo at 5 psi if that helps..Thanks.
 
The L tables govern fueling at low throttle positions e.g. idle.

What numbers you getting on throttle balance/ MAP screen?
 
Ok i checked the map reading and its showing 590 to 600. I disconnected the intake pipe coming from the turbo so its NA and i got the same reading. Perhaps my base tune is wrong ,? i have the 50020 tune in it.
 
Assuming you mean map 20050
I hear there was a recall on an early rocket map, don't know if this was map 20050 or not. There is a later map listed for 'standard' Rocket III, map 20222. You could try that, assuming 20050 was the recalled map.

In any case you're running a different setup than any canned map, so the map will need adjustments.
If you reduce the numbers in the L tables around your idle rpm vs the 590-600 MAP area, this should increase your AFR at idle




Since you're going into low positive pressure it might work out better if you set the F-L switch to 0s and use only the F tables to tune. I don't know.
 
Last edited:
Thanks for that ill try doing those adjustments , the map 20050 was one i installed in the bike a while back but never checked the afrs , it did foul up the plugs so im guessing it was running too rich from before. Im not sure how to set the F/L switch to zero it wont allow me to edit that table for some reason. I may just end up reprogramming the map 20222 back on, and adjust that one if all else fails. Thanks for your help and input.
 
Hi guys just a quick question i have downloaded the factory tune and with using tunecu i raised the F trim levels by 45% it wont allow more . Its still running a bit lean in the 15 to 16 afrs .. Is there a way around this thanks..?.
 
So your idle (~850rpm) AFR was 11:1 too rich.
You reduced the numbers in the L tables, idle AFR leaned out to 14.5:1.
You then increased the numbers in the F tables and it runs lean 16:1.

I assume this 16:1 is up at higher revs, not at idle - what revs and boost are you talking?

If so, my guess would be your injectors are maxed out by ECU.
If this is the case, adding a power commander will allow you run the injectors a little higher %.
Or you could just upsize injectors and stick to TuneECU
 
Yes in the higher revs , im only running 5 psi boost , would changing the values in the F tables for each cylinder help. Why does tunecu not allow higher then 45% adjustment on the trim tables.,?
 
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