Automatically cut power for wheel spin with a Haltech ECU

Wheel spin off the throttle costs lap time and chews rear tyres, and pulling ignition timing by feel from the driver's seat doesn't scale past a track day. Configure traction control on a Haltech Elite ECU so the ECU compares driven and non-driven wheel speed in real time and cuts power automatically the moment slip exceeds your target, without you touching the throttle.

Why this matters

A driver managing wheel spin manually is reacting after the fact, and by the time the car steps out the ECU could already have pulled the timing that stops it. Traction control on a Haltech Elite ECU runs a closed loop between wheel speed sensors and a cut strategy, checking slip many times a second and intervening before the driver feels the car move.

This matters most on cars making more torque than the rear tyres can put down cleanly out of a corner or off the line: turbocharged six-cylinder swaps, big-inch LS builds, anything running forced induction on a stroker bottom end. The haltech traction control setup described here applies to any Haltech Elite ECU platform, from a Barra straight-six to an RB30 stroker, and the same logic underpins the Haltech ECU tuning guide for performance workshops.

Before you start

• Haltech Elite ECU with ESP software installed, plus a laptop with the correct USB or CAN connection to the vehicle for live configuration and datalogging.
• Four wheel speed sensor inputs (two non-driven, two driven) if you want accurate open-diff slip detection, or two inputs minimum on a locked/limited-slip rear if budget or wiring space is tight.
• A confirmed tone ring tooth count for every sensor location — the one gotcha that catches people out mid-setup. Mismatched tooth counts between the physical tone ring and the software configuration will produce a slip figure that looks plausible but is wrong, and the ECU will cut power at the wrong moment or not at all.

If the car doesn't already have a Haltech-compatible crank trigger and cam sync sensor fitted, sort that first — the crank trigger kit guide for a Haltech ECU install covers sensor gap and trigger wheel selection before you get anywhere near traction control.

Set up your wheel speed inputs

1. In the ECU wiring loom, connect the front (non-driven) wheel speed sensors to two spare Digital Inputs (DI) — note the DI numbers for each side.
2. Connect the rear (driven) wheel speed sensors to two further Digital Inputs, keeping left/right consistent with the front pair.
3. In Haltech ESP, open ECU Operations > Wheel Speed and assign each DI to its physical location: Front Left, Front Right, Rear Left, Rear Right.
4. Enter the Tone Ring Teeth value for each sensor location, matching the physical tone ring exactly.
5. Enter tyre rolling circumference or wheel diameter and tyre profile so the ECU converts pulses into a real road speed for each corner.

Expected result: with the car on a hoist or rollers, the live wheel speed channels in ESP should read a sensible, matching value on all four corners as the wheels are spun by hand — if one corner reads double or half the others, the tooth count on that input is wrong.

Configure the traction control function block

1. Navigate to Functions > Traction Control and set the block to Enabled.
2. Set the Enable Condition — typically a switched input or a minimum vehicle speed, so the system only arms once the car is moving and doesn't interfere with idle or stationary revving.
3. Build the Slip Target Table, referenced against RPM or throttle position, so the ECU knows how much difference between driven and non-driven wheel speed is acceptable before it intervenes.
4. Set the Cut Method: Ignition Cut for a hard, immediate response, Ignition Retard for a smoother pull of power, Fuel Cut as an alternative or backup method, or Drive by Wire throttle closure on cars fitted with an electronic throttle body.
5. Configure the Cut Aggression table so the strength of the intervention scales with how far slip has exceeded target, rather than applying one fixed cut regardless of severity.

Expected result: on a rolling road or closed circuit, inducing wheel spin at part throttle should trigger a visible ignition retard or cut event in the ESP log, and the wheel speed delta should close back toward the slip target within a second or two.

Set up launch-specific wheel spin control

Standing-start wheel spin needs a more aggressive, separate strategy from mid-corner traction control, and Haltech Elite ECUs support this as a second variant of the same wheel speed setup.

1. Add a second Enable Condition for launch control, typically triggered by a clutch switch or brake pressure switch combined with a low road speed threshold.
2. Build a Launch Slip Target Table that allows more initial wheel speed differential than the rolling traction control table, since some controlled slip at launch is normal and desirable for a clean start.
3. Set a Cut Method for launch — many setups use Ignition Cut here for a harder, more predictable response than retard alone.
4. Confirm the launch strategy hands off cleanly to the rolling traction control table once road speed exceeds the launch threshold, so the car isn't running two conflicting slip targets at once.

Done this way, one wheel speed sensor setup covers both the standing start and the mid-corner cut, instead of wiring a separate system for each. For monitoring both in real time from the driver's seat, the Haltech iC-7 dash for track day and street builds can display live slip percentage and active cut status on a dedicated page.

Troubleshooting

• Traction control cuts on smooth, dry tarmac with no visible wheel spin. Check tone ring tooth count against the physical trigger wheel first — a mismatched value inflates apparent slip and triggers false cuts.
• No traction control activity at all, even with obvious wheel spin. Confirm the Enable Condition is actually being met — a switched input left in the wrong state or a vehicle speed threshold set too high will keep the function block dormant.
• Cut feels too harsh and unsettles the car mid-corner. Reduce Cut Aggression at low slip values so the first stage of intervention is gentle, reserving a hard ignition cut for larger slip events only.
• Wheel speed reads erratic or jumps between corners. Inspect sensor air gap and mounting — a loose sensor or damaged tone ring produces noisy pulses that the ECU reads as sudden slip spikes.
• Rolling traction control and launch control fight each other at the handoff speed. Check the road speed threshold that separates the two tables and widen the gap slightly so one strategy is fully disengaged before the other engages.

Customise your workflow

Once the base traction control setup is logging cleanly, there's more to build on top of it. Closed-loop fuel control can be layered in alongside slip management — see closed loop fuel tuning with a Haltech WBC1 for wiring an aftermarket wideband into the same ECU. Boost can also be scheduled per gear so power delivery matches available traction as the car accelerates through the box, covered in automatically control boost by gear with a Haltech Elite ECU. For circuit work, a GPS lap timer connected to the Haltech ECU lets you correlate traction control intervention with lap time directly, rather than guessing whether a tighter slip target actually helped.

FAQ

One last thing

The most common mistake isn't the traction control tune itself, it's skipping the wheel speed sensor validation step on the hoist before the first drive — a five-minute check that catches a wrong tooth count before it costs a set of tyres or worse. Confirm all four corners read matching, sensible speeds by hand-spinning the wheels before the car ever leaves the workshop.

Related guides

• Best crank trigger kit for a Haltech ECU install
• Haltech ECU tuning for performance workshops
• Closed loop fuel tuning: connect a Haltech WBC1 to your ECU
• Automatically control boost by gear with a Haltech Elite ECU
• How to connect a GPS lap timer to a Haltech ECU