4G63 vs 4B11, best turbo back pressure ratio and is the biggest turbo you can fit the best? Let's find out!

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Running 1170HP, 680 ft-lbs of torque and in excess of 53 PSI of boost, the English Racing Mitsubishi EVO X is pushing the boundaries and leading the pack to be the fastest Mitsubishi Evolution X in the world. Driver Myles Kerr discusses some of the challenges that come with pioneering a newer platform and where he sees the 4B11 being superior to the proven but now dated 4G63 power plant. Despite what a lot of people think, it does take more than just a healthy bank account to get this done 🤓

This Extreme Turbo System built EVO X runs Golden Eagle sleeves, stock stroke GRP Connecting Rods, a modified factory crank, GSC Power Division valvetrain and S3 cams, a Precision 7685 turbo and the MoTeC M150 with John Reed Racing modification brings it all together. The team had some huge drivetrain issues before getting the weight down and the car now runs a Graf h-pattern 5-speed dog box, Shep transfer case, Driveshaft Shop shaft and rear axles with a Mitsubishi 300GT rear diff. The power is currently a fixed 50:50 split and in the clutch department, an Exedy triple carbon clutch and Magnus Motorsports slipper system keep the launches consistent.

Andre and Myles also discuss why the biggest turbo isn’t the best, where there is still more weight removal to be done, the 4B11’s advantage over the 4G63 at low to medium power levels and the sweet spot for turbo back pressure when it comes to drag racing.

At the TX2K 2019 event, Myles and the EVO set a new record with an 8.167-second pass at 180.79 MPH so the team is on track and creeping closer and closer to that 7-second pass.

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