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How the Dodge Demon launches: Transbrake + Torque reserve explained

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How Does The Dodge Demon's Transbrake and Torque Reserve Work?


IMPORTANT NOTE - The throttle is located before the supercharger, unlike how it is drawn in the video. This doesn't really change much, you will have pre-filled 8 psi of boost past the supercharger, but the drawn location of the throttle is incorrect. You can clearly see the throttle comes first at 1:37 in the video. Apologies for any confusion, hope everyone's having a wonderful day!

From The 2018 Dodge Demon Press Kit:
"TransBrake is a production car first. Every Dodge Challenger SRT Demon is equipped with the standard TorqueFlite 8HP90 eight-speed automatic transmission. Already a proven and robust gearbox used with the HEMI Hellcat V-8, the transmission gets some significant changes for duty in the Challenger SRT Demon.

Internal changes include an upgraded torque converter that delivers an 18 percent increase in torque multiplication. Also, the stall speed is increased 11 percent and the lockup speed is increased.

The Challenger SRT Demon is the first-ever, factory-production car with TransBrake, which locks the transmission output shaft to hold the car in place before a standing start. This lets the driver increase engine speed up to 2,350 rpm without overpowering the brakes, resulting in quicker power delivery and up to 15 percent more torque at launch.

Driver-oriented step-by-step instructions are displayed on the instrument cluster to guide the driver through the staging process and help them keep their focus on the Christmas Tree.

The TransBrake helps to improve driver reaction time and launch consistency by using the steering wheel paddle shifters as a launch trigger – a paddle launch improves reaction time by 30 percent compared with a foot-brake launch. In addition, the system enables delivery of initial torque to the flywheel as soon as 20 milliseconds after launch.

TransBrake works in conjunction with another SRT Demon first-ever factory-production car feature, Torque Reserve, to deliver increased levels of power and torque at launch.

Torque Reserve becomes active once engine speed passes 950 rpm. It does two things:
1. Closes the bypass valve, “prefilling” the supercharger with boost
2. Manages fuel flow to cylinders and manages spark advance or retard to balance engine rpm and torque

With TransBrake and Torque Reserve active, the SRT Demon has more than 8 psi of boost at launch and up to 120 percent more engine torque than without Torque Reserve. TransBrake also preloads the driveline with torque, leading to full engine torque delivery at the rear wheels 150 milliseconds after the shift paddle is released. That results in faster acceleration at launch, faster 60-foot times and an improvement of more than a tenth of a second in quarter-mile times, which can be an entire car length."

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About this video

Duration 06:09
Posted Aug 7, 2017
Series Automotive
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