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Old 01-11-2005, 11:22 AM   #1
Scooby Specialist
Member#: 34877
Join Date: Apr 2003
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2005 Legacy GT sedan

Question 91 or 93 octane for EcuTek reflash?

I'm getting my car an EcuTek reflash shortly and I'm wondering which octane to get it tuned at. I have 93 readily available but what if I'm away and can't find it? If I get it tuned for 91, what happens if I put 93 in as I've done since I've owned the car. I guess this is what's nice about the AccessPort since you can change maps according to the octane.
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Old 01-11-2005, 02:40 PM   #2
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no expert but u shud be alright. ur computer will learn and prob pull timing limiting boost etc, until u put 93 in prob a bunch of times to run it back to an upper loop, I think there are 16 or so. I am running 93 on my jdm ecu until i get it tuned, so if that is any consulation. Matt
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Old 01-11-2005, 03:21 PM   #3
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Tune the car with whatever octane you'll drive the most with. If I was still in PA, I'd be tuning on 94 octane... But now I'm back to crappy 91 (with better weather).

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Old 01-11-2005, 03:41 PM   #4
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Get it mapped for the highest available octane you will use regularly.
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Old 01-11-2005, 10:41 PM   #5
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Get the ecu mapped with an EcuTek map that was designed for 91 octane, but will adapt (for more power) if you run higher octane. There are 2 ways to tune a car. One way is at the limit of whatever octane level you have and another way is to tune it just like Subaru did.... i.e. for 91 with the ability to advance itself if higher octane gas was available. There are EcuTek tuners/resellers in the States that use this method of tuning... but the majority put the blinders on, tune to one octane level, and leave it at that.
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Old 01-12-2005, 01:17 PM   #6
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Nice post over on Cobb's site today. Ben at EcuTek also recommended tuning at 91 octane and allow it to advance itself for better gas.
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Old 01-13-2005, 02:49 AM   #7
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AP Stage2 Clark Tuned


i just had mine tuned for 91 octane. I have 5 gallons of 101 race gas at the house for when I had the UTEC. I wonder if I could do a mix of 91 and 101 when I hit the drags. Not sure if my reflash has an advance allowed
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