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Old 05-28-2008, 03:19 PM   #1
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Default Anyone gone from 93 to 91? (octane)

So I'm still undecided on what to do with the Miata when I move to Cali. I'm thinking take it out there and leave it parked most of the time, but as soon as I get to about the middle of Texas there'll only be 91 at the pumps, and the car's tuned on 93. So...

Just take a few degrees of timing away? Add any more fuel?

Of course, I'm going to keep my 93 octane .msqs saved for when I (hopefully) move back out here or somewhere else with 93.
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Old 05-28-2008, 03:30 PM   #2
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GA gas is good but not great (not like that Texas 93). You'll need to peel back a bit of timing, but don't forget you've got WI. A little meth in the water will do worlds. I wouldn't get too worried.
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Old 05-28-2008, 03:30 PM   #3
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That's pretty much it. Your mixture may lean out a bit when you get into the CA gas, but it's impossible to say how much. I'd expand the EGO authority to, say, 10 or 15% and keep an eye on Gego. If you don't already have it, set one of your Megatune gauges to Gego.

As to timing, just pull 3 or 4 degrees and live with it. You can probably leave it alone in the lowest kPa cells so as not to mess with your idle too much.
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Old 06-04-2008, 02:14 PM   #4
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Thanks for the advice, guys.

Ben - my WI causes a lot of boost creep, so I disconnected it.
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