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Been researching this a bit and apparently the e67 ecm doesn't just switch to the low octane table. It constantly blending the two tables based on conditions and presence of knock. Using 93 octane should keep you in the 100% use of the high octane table.
From HPTuners forum
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E38 / E67 use a percent spark bias approach. With quality fuel you may see 100% High octane spark, and obviously 0% Low octane spark table.
A good tune will run very close to this.
If you are overly aggressive with the High octane spark values, you may see a bias begin to occur - 90% High octane table and 10% Low octane table, etc.
E38 / E67 don't simply run off the High or Low octane spark tables - they continuously blend these values for the best spark per given situation.
And
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the ECM interpolates between the high octane and low octane all the time based on the Knock Learn Factor. You can log this in the scanner.
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 Bryan 2018 ZL1 M6 |