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      08-06-2013, 06:58 PM   #1
PTek Will
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JB4 E85 Boost Range

Hey Guys,

The first time I tried E85 (about 30%) mixed with 91 on map 5 I hit 17 psi consistently. Now it doesn't even reach 15 psi with the same mixture. It hovers right below the 3/4 line (14.5psi?), whereas before it was about 2 ticks above 3/4. Any ideas why?
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      08-06-2013, 08:03 PM   #2
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Map 5 auto tunes to conditions. Perhaps the weather was cooler last time you tried, your fuel quality was higher, or maybe it just hadn't fully adapted yet. A number of outside factors could do it.
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      08-07-2013, 11:16 AM   #3
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You'd want to do a datalog to see what you're actually targeting. If the JB4 detects knock, higher temperatures, running lean, or other issues, it will lower it's target. If the target is high but boost is well below it, then that indicates another range of issues with the car. Boost leak, wastegate issue, vacuum line loose, etc.

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      08-07-2013, 11:20 AM   #4
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Also E85 is not exactly E85. The blend changes by state & month. You can do a search on the EPA site to get the blends & months for your state.
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