![]() However if you have a 4 cyl Miata, then your load under the same conditions as noted above would be about 40% instead of 20%, which means your tuning table will be adjusted differently at different points. You will take your best stab to guess what is the most optimal way to get to the finish line fastest. ![]() ![]() So your tuning table around the 20% would be tuned to have an AFR around 16, while when at 100% load your tune will be tuned for something closer to 11.5 to 12.5, and a variety of AFRs based on your driving habits, race event, personal preferences etc. Then when you are say 80% or 100% load you want maximum power, as you do not have enough power and you want every Hp you can get. Such that you get the most out of the fuel in the tank. At this point you have enough power and you want to minimize fuel consumption. If you have a V8 in a Miata, and you need a lite load perhaps like when approaching a turn, you might have a load around 20%. The below graphic shows how you vary horse power as you change AFR. Every person will be differ in what RPM and loads they want power vs fuel efficiency. This commonly means you are looking for minimal fuel consumption when you are maintaining speed or decreasing speed, then max power when you are at higher engine loads. This section assumes you are looking for fast track times. Most people who do the after market ECU are looking to get around the track faster.
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