Daniel Souza
Well-Known Member
- Joined
- Jan 7, 2017
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- Age
- 46
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- Glenwood
- Members Ride
- VF2 Wagon SSV Redline
I just wanted to share some data collected with OBDlink Mx and Torque app comparing the Knock Retard from Caltex E10 and Caltex 98.
Just some background first:
The ECU has a parameter called "Knock Learn Up Thresh" (HPTuners). The Knock Learn factor is incremented (moved towards low octane) if knock retard exceeds this value. A nice explanation can be found here
So values above 1.5 deg for the LS3 the ECU will start shifting to the low octane spark table.
The data is what one would expected. The E10 goes over the threshold much more often.
The interesting thing is that a combination of simple tools can be used to keep track if the car is running as expected and also help the early stages of learning tuning .
Just some background first:
The ECU has a parameter called "Knock Learn Up Thresh" (HPTuners). The Knock Learn factor is incremented (moved towards low octane) if knock retard exceeds this value. A nice explanation can be found here
So values above 1.5 deg for the LS3 the ECU will start shifting to the low octane spark table.
The data is what one would expected. The E10 goes over the threshold much more often.
The interesting thing is that a combination of simple tools can be used to keep track if the car is running as expected and also help the early stages of learning tuning .
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