Thundermax - tuning for mileage - is this right?
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Road Master
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Thundermax - tuning for mileage - is this right?
Seeking feedback over in this thread - thanks.
https://www.hdforums.com/forum/elect...his-right.html
https://www.hdforums.com/forum/elect...his-right.html
Road Warrior
Joined: Apr 2010
Posts: 1,739
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From: Suffolk, England
Looks about right. However, I don't know the Thundermax system so can only comment on general tuning.
On other systems for reprogramming the ECU you don't enter separate AFRs for the closed-loop area. You just enter a place-holder value that indicates that if this value is in the cell then it means use closed-loop, this being "14.6" on Harley ECUs. The real closed-loop AFR is then set by tweaking the Closed Loop Bias tables for each cylinder. Your tuner might be different and you are able to set separate AFRs across closed-loop but just check that is the case.
If it is right to adjust as you are then I'd say those ranges look a little narrow. Generally, stock closed-loop runs in a block from something like tickover (1000rpm) to 4000 rpm and throttle openings up to 80%. Though you tend to narrow this for performance tuning it would still be wider than your 2560-3328 and up to 25% throttle. Your O2 sensors are not going to be doing much with that narrow a range.
On other systems for reprogramming the ECU you don't enter separate AFRs for the closed-loop area. You just enter a place-holder value that indicates that if this value is in the cell then it means use closed-loop, this being "14.6" on Harley ECUs. The real closed-loop AFR is then set by tweaking the Closed Loop Bias tables for each cylinder. Your tuner might be different and you are able to set separate AFRs across closed-loop but just check that is the case.
If it is right to adjust as you are then I'd say those ranges look a little narrow. Generally, stock closed-loop runs in a block from something like tickover (1000rpm) to 4000 rpm and throttle openings up to 80%. Though you tend to narrow this for performance tuning it would still be wider than your 2560-3328 and up to 25% throttle. Your O2 sensors are not going to be doing much with that narrow a range.
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Jon Wilder
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Oct 14, 2018 07:11 AM
