To my surprise, the DPTune ECU was right there with the best we could get from the Greddy EMU, only short about 1-2 horsepower and torque in a few spots. Unfortunately I either lost the AFR file or Church did not give it to me. The baseline runs for the BP4Y and BP4W show that the Federal ECU is the better of the two by a small margin, but both have poor AFR numbers. Mazda engineered and tuned this engine well from the factory not leaving much to gain. Although I am a little disappointed that we did not find more power, it is good to know the AFR is safe and the piggyback is reliable and easy to tune.
Thin blue line is maximum power from Greddy Emanage Ultimate and the thick red and green lines are both baseline runs from the BP4Y ecu.
Again, the thin blue line is Greddy EMU and the thick green line is the DPTune reflashed BP4W.
Left side shows two baseline runs each from both the stock BP4W (thick green and red lines) and BP4Y (thin green and red lines) with EMU at the top (blue line). Right side shows Air/Fuel ratio.
Stock BP4W baseline runs versus EMU.
The Greddy Ultimate can increase the factory rev limiter by fooling the stock ECU into allowing the fuel injectors to function past the factory rev limit. Basically, it does this by holding the injector duty cycle a few hundred rpm prior to the factory fuel cut and using these values up to the new specified rev limit. One additional duty cycle tuning column is supplied but that is all you get regardless of set rpm limit. Ignition continues to fire as needed. Once the values are saved, changing the rev limiter is as easy as keying in the new rev limit and saving the file to the EMU; no other changes needed.
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| Rev Limiter Set Table |
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