 A revised turbocharger offers up to 20-percent quicker response at lower engine speeds compared to previous 4G63.The 4B11T offers a broader torque curve, producing more torque than the 4G63 at all engine speeds, helped by the engine's square bore and stroke design, both measure .Redline tachometer hashes start at 7,000 rpm, with a fuel cutout (true redline) at 7600 rpm to protect the engine.