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I'm a beginner in ecu tune and I have some questions.
When do I need to tune ignition timing?
1. Stock set to use 91RON from the factory and want to use 95 or more
- basically advance the timing?
2. Stock recommend to use premium fuel from the factory and want to downgrade to use 91RON
- basically retard the timing?
3. Stock 91 from factory and modified airfilter and full exhaust but still want to keep it 91 (retuned AFR & Air table for each cylinder)
- Can I leave it as is? Or even can I just advance it 2-3 degree because it gets to have more air and more fuel? (No dyno in this case)
Every engine combination is going to be potentially different, but as a general guide -
1/ yes.
2/ yes - but it depends on things like the dynamic compression ratio of the engine, it's chamber shape, etc. Some may be already running close to the limits.
3/ depends - the charge is denser, so will burn faster and need less advnce, but it may be colder which could allow a little more advance.
