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nylacali nylacali is offline
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Join Date: Jul 2020
Car: '20 M340i
Default B58 Log Review and questions about boost/e85 - 07-29-2020, 11:51 AM

Hey guys, been loving my JB4 since installing on my M340i. I do have a couple questions about the boost readings and the e85, as well as wanted to see if you could take a look at my log and lmk if it looks alright.

These are probably noob questions so apologies in advance. First, why does the boost jump to 28 or so on the log during shift changes?

For the e85 reading, is this reading the amount of ethanol detected in the fuel? I ask because I had originally installed the JB4 on a 95 octane blend I made with 91oct and 101 octane fuel. The e85 reading on that was 4 or 5. I refilled the tank from almost empty with all CA blend 91 octane (assuming 10% ethanol) and the reading jumped to 25 e85 for the first ~40 miles on that tank. It's since dropped down to 7, which I can see being accurate. I'm wondering if this is just the ECU getting used to the sudden change in octane/ethanol levels or if it was something else.

Thanks in advance.

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