Motor timing and demag compensation are the two BLHeli_32 settings that separate a reliable quad from one that randomly desyncs and tumbles to the ground. Most pilots leave these at default and hope for the best. When it works, it works. When it doesn’t — and it often doesn’t with modern high-KV motors — you need to know exactly what to adjust.
What Motor Timing Actually Does
Motor timing controls when the ESC energizes each motor phase relative to the rotor’s position. Advancing timing (higher degrees) energizes the winding slightly earlier. This produces more RPM at the top end but generates more heat and draws more current. Retarding timing (lower degrees) is more efficient and cooler but produces less peak RPM.
BLHeli_32 offers timing values from 0° to 31°. The default (usually 15-16°) is a compromise that works for most setups, but it’s not optimal for all motor and prop combinations.
Low timing (0-10°): Cooler motor temperatures, slightly less peak RPM, smoother low-throttle response. Best for low-KV motors on large props where torque matters more than top-end speed.
Medium timing (15-20°): The default range. Good balance of efficiency and power for most 2207-2306 motors on 5-inch props. This is where I start every new build.
High timing (21-31°): Higher peak RPM, more thrust at full throttle, but significantly more heat. Motors run 10-20°C hotter at high timing. Best for high-KV racing setups on small props where you’re at full throttle for short bursts. Do not run high timing on long-range builds — you’ll cook the motors on sustained climbs.
Demag Compensation: The Desync Preventer
Demag compensation is BLHeli_32’s solution to a specific problem: when you cut throttle rapidly, the motor’s magnetic field collapses and can induce a voltage spike that confuses the ESC’s position detection. The result is a desync — the motor stutters, the quad tumbles, and you’re walking to pick it up.
Demag compensation detects these events and adjusts the commutation timing to prevent them. The trade-off: higher demag settings reduce maximum power output because the ESC is using some of its processing capacity to monitor for demagnetization events.
Demag OFF: Maximum power, zero desync protection. Only use this on very well-matched setups with conservative timing. If you’ve never had a desync, leave it off.
Demag LOW: Light protection with minimal power loss. The default and recommended starting point. Handles most normal desync scenarios without a noticeable reduction in top-end thrust.
Demag HIGH: Aggressive protection. Reduces peak power by 5-10% but virtually eliminates desyncs. Use this when you’ve tried everything else — lower timing, different props, capacitor upgrades — and still get random tumbles. The power loss is real but the quad stays in the air.
Motor Timing and Prop Matching Table
| Motor Size (stator) | Typical KV | Prop Size | Recommended Timing | Demag Setting | Expected Temp Rise |
|---|---|---|---|---|---|
| 2207 | 1700-1950KV | 5″ tri-blade | 16-18° | LOW | +25°C over ambient |
| 2306 | 1700-1950KV | 5″ tri-blade | 15-17° | LOW | +30°C over ambient |
| 2207 | 2450-2750KV | 5″ bi-blade (racing) | 20-23° | OFF or LOW | +40°C over ambient |
| 2506-2807 | 1300-1500KV | 7″ bi-blade | 12-15° | LOW | +20°C over ambient |
| 2004-2204 | 3000-4000KV | 4″ tri-blade | 18-21° | LOW | +35°C over ambient |
| 1507 | 3600-4200KV | 4″ ultralight | 18-22° | LOW | +30°C over ambient |
| 1404 | 4500-5500KV | 3.5″ ultralight | 20-25° | LOW or HIGH | +40°C over ambient |
| 0802 | 19000-25000KV | 40mm whoop | 20-25° | HIGH | +45°C over ambient |
How to Tune Timing Step by Step
- Start at default (16°), demag LOW. Fly two packs normally — mix of cruising and full-throttle punch-outs.
- Land and immediately check motor temperature with a finger or IR thermometer. Warm is fine (40-50°C). Hot enough that you can’t hold your finger on the bell for 5 seconds means you need to reduce timing.
- Listen for desyncs on rapid throttle cuts after punch-outs. If you hear a stutter or the quad twitches, increase demag to HIGH.
- Advance timing 2° at a time if motors are cool and you want more top-end. Test with a punch-out — if you see or hear oscillations at full throttle, you’ve gone too far. Back down 2°.
- After final settings, fly a full pack aggressively and check motor temps again. Anything under 60°C is safe. Above 70°C risks demagnetizing your motor magnets, which permanently reduces motor power.
Common Mistakes and How to Avoid Them
Mistake 1: Crank motor timing to 25° on a heavy 5-inch build expecting more speed
What actually happens: motors draw 15-20% more current, the battery sags harder, and you gain maybe 3% more RPM. The extra current mostly becomes heat, not thrust. The fix: Timing past 20° on standard 2207/2306 5-inch setups delivers diminishing returns. If you want more speed, try higher-KV motors or lighter props instead.
Mistake 2: Running demag OFF on a build that’s known to desync
Some motor-ESC-prop combinations just don’t play well together at certain RPM ranges. If you’ve had even one desync in flight, that’s one too many — a desync at the wrong moment totals a quad. The fix: Switch demag to LOW as a minimum. The power loss is imperceptible in flight and the protection is worth it.
Mistake 3: Ignoring motor temperature as a tuning metric
Timing that’s too advanced shows up as heat long before it shows up as a desync or performance problem. If your motors come down hot enough to sizzle a drop of water, you’re accelerating magnet degradation. The fix: Check motor temps after every tuning change. A $20 IR thermometer pays for itself the first time it prevents a cooked set of motors.
Mistake 4: Assuming BLHeli_32 defaults are correct for high-KV micro builds
The defaults were calibrated for 5-inch 2306 motors running at 1700-1950KV. A 1404 at 4500KV spins nearly three times faster and needs different timing characteristics. The fix: Start at 20-22° for micro builds and work down from there if motors run hot. High RPM motors often need higher timing to run smoothly at the top end.
Mistake 5: Not re-checking timing after a prop change
Switching from a 5-inch tri-blade to a 5-inch bi-blade changes the motor’s load characteristics completely. Timing that was perfect for the tri-blade may cause desyncs or overheating with the lighter bi-blade. The fix: After any prop change, fly one test pack and re-check motor temperatures before committing to the new setup.
⚠️ Regulatory Notice: ESC and motor configuration changes affect your drone’s power output and reliability. Always bench-test configuration changes with props removed before flight testing. Ensure your drone’s weight, power output, and flight characteristics comply with 2026 regulations in your region. Some jurisdictions impose power-to-weight limits on recreational and commercial drones.
Our FPV motor sizing guide covers KV selection and prop matching in detail — timing is the final step in that optimization chain. For the ESC side, our BLHeli_S configuration guide covers the Bluejay-flashed workflow if you’re not running BLHeli_32 hardware.
For pilots pushing high-KV motors, the T-Motor Velox V3 series ships with N52SH magnets rated for 150°C — significantly more headroom than standard N48 magnets when running aggressive timing. Available at uavmodel.com in sizes from 2207 to 2808.