Ignition Timing
How many degrees before the piston reaches top dead center the spark fires. More advance = more power, but too much causes knock.
Why it matters
The tune sets optimal timing for your fuel and hardware. If timing is being pulled (retarded), the ECU detected something dangerous.
What to look for
Timing should match the tune's expected values. Any timing pull (retard) during WOT should be investigated.
Related terms
When the ECU detects detonation (uncontrolled combustion), it pulls ignition timing to protect the engine. Any amount above 0 degrees means knock was detected.
Uncontrolled combustion where the air-fuel mix ignites from pressure/heat instead of the spark plug. Causes knock and can destroy engines.
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