The problem it solves
A drag car only goes as fast as the tires will let it. Too much power early and the tires spin or start to shake; too little and you leave ET on the table. The trouble is that the right amount changes all day long. Track prep, surface temperature, air density and tire temperature all move the line between hooking and spinning, often between one round and the next.
Tuning a fixed power curve for that moving target is guesswork. Advanced Torque Management (ATM) takes a different approach: instead of guessing how much power the track will hold, you tell the ECU how the car should accelerate, and it manages power in real time to follow that plan.
How Advanced Torque Management works
The heart of the system is a driveshaft RPM sensor. It measures how fast the driveshaft is turning and sends that to the ECU many times a second. In the torque management tables, you build a target: the driveshaft speed you want at each point in the run.
During the pass the ECU compares the real driveshaft speed to that target. If the driveshaft is spinning up faster than planned, the tires are almost certainly slipping, and the ECU pulls power straight away to bring it back to the curve. The correction works both ways: if driveshaft speed falls below the target, the ECU adjusts the tune to bring it back up to the curve. The result is a car that accelerates along the path you designed instead of the path the track happened to allow.
Driveshaft speed is the headline input, but the tables can also be built around wheel speed or engine RPM, which gives you options on cars where a driveshaft pickup is awkward to fit. You can also set up several profiles and choose between them with a sensor input or a switch panel on the dash, for example a conservative profile for a marginal track and a more aggressive one for a well-prepped surface.
A simple example
Picture a car that usually hooks well but shakes the tires about a second into the run on a hot track. Without torque management, the fix is to take power out of the whole launch and hope it's enough. With ATM, the target curve describes a smooth, steady rise in driveshaft speed. When the tires begin to break loose, driveshaft speed jumps above the curve, the ECU trims power just long enough to regain grip, and the car keeps going. On a good track the same car never touches the limit, so it isn't slowed down for no reason.
Why it makes you faster
- Consistency. Racers say it all the time: consistent cars run lower ETs. When the ECU is holding the car to a target, run-to-run variation drops, and that makes every other tuning change easier to judge.
- Fewer aborted passes. Catching wheelspin and shake early means more runs make it to the finish line, and more useful data in your logs.
- Less guesswork on changing tracks. Surface and weather still matter, but the ECU is correcting for them in real time instead of you correcting for them between rounds.
- Less abuse on the driveline. Tire shake and big wheelspin hits are hard on axles, converters and transmissions. Controlling them protects parts as well as ETs.
Which Haltech hardware supports it
| Hardware | What you get | Good fit for |
|---|---|---|
| Elite 2500 T | Torque management built in, plus drive-by-wire | New builds that want ATM from day one |
| Elite 2500 with the 2500 T upgrade | Adds torque management to an existing 2500 | Racers already running an Elite 2500 |
| Race Expansion Module (REM) | ATM plus extra injector drivers, inputs and outputs, used alongside an Elite 2500 | Big-injector-count or heavily instrumented race cars |
The REM deserves a closer look for serious race builds. Paired with an Elite 2500, it allows sequential, staged injection with up to 16 injectors and can drive as many as 32. It also adds analog and digital inputs for data acquisition and extra outputs. See our REM overview and the Elite 2500 T overview for the full input and output counts, and the Elite 2500 and REM 16-injector harness if you're wiring one from scratch.
Running a Nexus ECU instead? Nexus has its own torque management function; ask us how it compares for your car.
Setting it up: where we start
- Get a clean driveshaft signal. Mount the pickup securely and make sure the trigger target is balanced and well clear of the sensor at speed. A driveshaft split collar is the tidy way to add magnets without modifying the shaft; they come in several diameters, so measure yours first.
- Log a few good passes first. The best target curve is usually a smoothed version of what your car does on a pass that hooked. Build from real data, not a guess.
- Start with a gentle response. Let the system make small corrections at first and confirm in the logs that it's pulling power when, and only when, driveshaft speed runs ahead of the target.
- Add profiles once the base one is right. A second profile for poor tracks is far more useful once you trust the first.
Torque management is only as good as the speed signal it's fed. A dropped or noisy driveshaft signal can look like wheelspin or hide real wheelspin. Check the raw channel in every log before you start moving target curves around.
Advanced Torque Management FAQ
Is Advanced Torque Management the same as traction control?
They're related but not the same. Traction control typically compares driven and undriven wheel speeds to detect slip. ATM follows a target speed curve for the run, which suits drag cars where you want the car to accelerate along a precise, repeatable path.
Do I need a driveshaft sensor?
Driveshaft RPM is the preferred input, but the tables can also work from wheel speed or engine RPM.
Can I add ATM to my Elite 2500 later?
Yes, a 2500 can be upgraded to 2500 T functionality, or paired with a REM. Talk to us about which route suits your car, or book a free consultation.
