One month after I picked up my 2020 A90 Toyota Supra Launch Edition, I teamed up with Evasive Motorsports and Dai Yoshihara to see what sort of lap times we could put down with one of the first modified MK5s. Equipped with a prototype set of Clubsport coilovers from KW (basically borrowed from one of their race cars in Germany), 18" Titan 7 wheels and stickier Yokohama A052 tires, we had high hopes for our quick shakedown at Buttonwillow Raceway. To our surprise, we ran into issues with disengaging the traction control and vehicle stability control (VSC). Each lap we took the Supra out on, the traction control and VSC would relentlessly come back on no matter how many times we tried and disengage it. This made it impossible to throw down a hot lap.
The root of the problem could only be traced back to the fault codes you get when you modify a new Supra (which, at the time was foreign territory to everyone). There could've been a number of codes which triggered this, from the broken ride height sensor (which is a common issue when lowering the Mk5) to missing TPMS sensors, having aftermarket seats and removing the stock adaptive suspension, which, in the end, was the main culprit. Come time for Super Lap Battle, we remedied some of the codes and swapped to KW V3 coilovers; however, we suffered the same problem again having not fixed all of the electronics issues.
After SLB, I decided to give my friends at RS-R a call and sure enough, they've been selling hundreds of their EDC cancellers which have been tested on mild-to-wild modified Supras from around the world running various coilover setups. Auto Tuned in Monrovia, California, helped install the new RS-R modules which didn't take long once the car was lifted and the wheels were off. The RS-R cancellers come with mounting brackets and hardware so it's not just zip tied in place - a nice touch.
The front cancellers are mounted with the factory brake bracket on the knuckle. The rears are installed inside the fenders on an anchor bolt.
The installation of all four cancellers was a breeze, felt secure and gave me some reassurance, although the ultimate test was whether or not they would work.
I brought the Supra out to a private testing day at Streets of Willow. With the ECU now reading no errors in regard to the suspension, I was able to disengage the traction control and VSC, and they stayed off! I should note, it did take 2-3 times of pressing the button to turn it off, but it worked. I've been told by other Supra owners that it works flawlessly on their car on the first try, but as for my car, it could be due to the fact that I have other codes still throwing the computer off.
Nonetheless, the RS-R EDC cancellers worked and while they retail for $349, they're definitely worth the investment if you're considering pushing your modified Supra to its limit. Now I'm looking forward to heading back to Buttonwillow one more time to set that hot lap. Third time's a charm, right?
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