VersaTune User Forum

My AFRs from 3,000-9,3000 rpms are looking decent, but i keep trying to enrichen the AFR tables in the 2,000-3,000 but it seems to have no effect. any hints on richening up the 2,000-3,000 rpm range? I'd like to see 13.3 AFR / 0.90 lambda.

vtune file and images attached

Also, all three of the charts below are with the same tune, yet the AFRs between 2,000-5,500 seem to be very inconsistent in terms of enrichment. it honestly looks like sometimes the ECU is trying to target 0.95 lambda, and other times it suddenly drops to the values more consistent with my AFR tables.

Up to 0.625 load you are targeting stoich. Would you mind posting the actual logs? These graphs are not readable unless you know what was logged, the only thing that I can make full sense of is the RPM really...

P.S.: I am no a rotary specialist, but are you trying to blow that engine up? It's pretty clear from the AFR and known retard tables...

Apologies for the delayed response. sure, i attached four logs that show inconsistent / weird fueling from 2,000 to various RPMs

Do you all think load limit unknown might be playing some time-dependent role in fueling below 6,000 rpms?
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I do not think so, but you can always change it and reflash your car to try it out.

There is another table that is maximum load limits for closed loop... those were set quite high in the lower RPM ranges, seems like a promising option to explore. will report back!

That is supposed to set the limits based on load for commuting from closed loop to open loop.

i'm going to try enrichening the acceleration enrichment tables - i know VT says that the ECU uses the lowest value between enrichment and air fuel tables, but i suspect these tables might've been causing the car to run quite lean up until ~5,000 rpms as other rx8 owners have noted.

Follow-up: Load limit unknown was indeed screwing my attempts to tune in the 2,000-5,000 rpm range.

i changed my load limit unknown values to around 0.65 - 0.75 as rpms increase between 2,000 and 5,490, and now it is easy to enter open loop and rely upon the air fuel ratio tables for tuning.

If you leave load limit unknown to default, the car is either going to target stoic or the acceleration enrichment tables, which are pretty lean for power (but good for gas mileage and emissions)