Mitsubishi Lancer Evolution EVO X ACD Tuning Flash Reprogram




Our ACD Tune works by adjusting the torque split between the front and rear differentials. The delicate interplay between the differentials allows us to manipulate handling characteristics. We can alter the way the car responds on the street and track in specific scenarios, whether it’s braking on loose surfaces, turn-in response during cornering, and we can even modify the level of under-steer upon corner entry/exit.

From a technical perspective, the center differential is basically a limited slip differential with an adjustable preload. The preload is determined by the pressure of fluid in the center differential. By regulating solenoid current, our tune allows us to control the fluid pressure. As you increase fluid pressure the preload increases proportionately, as more torque is required to slip the differential, and vice versa.

“I recently had my Evo X AYC system tuned. I was in need of a more neutral feel on track since it tended to understeer. Once this ACD Flash was complete, there was a noticeable difference on the street but the true benefit was on track. In corners where I used to plow towards the outer edge, I am now able to keep a more controlled line and get on the throttle earlier. The overall neutral mechanical grip this tune provides made a huge difference. With this tune and a couple of other tweaks, my lap times greatly improved.”

– Customer Testimony


ACD Removal is simple:

1. The ACD Unit is located on the drivers side near your pedals. If your car has an insulated panel cover, remove the two clips holding it in place.


2. Finally, locate the ACD Unit on the left side, unplug it, and remove the 10mm bolt holding it in place.



You are paying for a service, we are not selling any parts. You ship us your ACD, we flash it, and then ship it back to you. If you are not satisfied 100% money back guaranteed!

Please reach out to us before placing your order to discuss the various options you’d like us to apply (Circuit Racing, Drag Racing Etc.) estimated turnaround time, and to confirm the procedure for sending out your ACD. Please reach out to us directly if you are interested in local tuning.

* Return policy: If you are unsatisfied with our service within 30 days of purchase, please contact us directly and we will begin the process of returns. We will ask you to ship your ACD back to us so that we can remove the tune we applied originally and revert the ACD to it’s original state. As soon as we revert the ACD and send it back we will issue you a refund minus the cost of shipping (If you did not supply us with a return packaging label). 

Compatible Vehicles:
Mitsubishi Lancer Evolution X