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Old 03-07-2013, 05:01 PM   #1
Perpetual Legend
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Question Fuel question. Run 91 on 93 open source tune?

So long story short. I was thinking of taking a road trip, my car is open source tuned "conservatively" for 93 octane. If for some reason I have to stop and re-fuel and cannot get 93, would it be detrimental to use 91 and drive? I would obviously take it easy driving and stay out of boost. Does anyone think this would be a major issue?

I searched, and found this question asking, but it seemed to me that they were asking about the cobb AP OTS maps.. I cant just change mine obviously.
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Old 03-07-2013, 05:06 PM   #2
kilfarsnar
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I asked my tuner this same question. You should be fine as long as you take it easy and don't boost much. Try accelerating in 5th without boosting!

For reference, my tuner took my 93 octane map, dialed the boost down from 19 PSI to 16 PSI and called it a 91 octane map. So I would think you'd be fine as long as you don't boost much.
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Old 03-07-2013, 05:13 PM   #3
Perpetual Legend
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Thanks, my map only boosts to about 16psi anyways, so i figured that would help.
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Old 03-07-2013, 05:24 PM   #4
HinshawWRX
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Call/email your tuner. It's almost always "ok" to run a lower octane for "emergency" or lack of fuel situations, you just need to be cautious. Your ECU will only have a certain degree of retard built into it.
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Old 03-07-2013, 05:33 PM   #5
Perpetual Legend
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Thanks hinshaw, I did talk to them earlier today, I kinda got lost in the conversation, and started getting off track when we started talking about just getting a Cobb so I could switch maps. Then, I would get my car re-dyno tuned with the AP.. $$$! I guess in hindsight, I should have started with the cobb. But I am very happy with the open source tune, and did not think of needing to change maps, until i thought about not being able to locate 93 fuel.

Thanks again!
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Old 03-14-2013, 01:28 AM   #6
kilfarsnar
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That's most of the reason I spent the extra money on the AP. That and it followed me through my mod path.
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Old 03-14-2013, 04:14 AM   #7
Wrxtacy5150
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I couldn't imagine it doing anything detrimental. You should be fine
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Old 03-14-2013, 07:29 AM   #8
Unabomber
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You'll be fine. The only reason to show concern for a 2 point reduction in octane is:

1. You have an OMG 22 PSI map.
2. You know you will be driving like a moron and nailing the gas in all gears.

As long as you drive normal, you will be fine with occasional tanks of 91 on a 93 map....especially if you are taking a longish drive from one state to the next where you can't get 93.
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Old 03-14-2013, 08:43 AM   #9
Loyale93
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Quote:
Originally Posted by HinshawWRX View Post
Call/email your tuner. It's almost always "ok" to run a lower octane for "emergency" or lack of fuel situations, you just need to be cautious. Your ECU will only have a certain degree of retard built into it.
All these cars have a certain degree of retard in them.

Sorry, couldn't help myself.

OP, you'll be fine. Stop sweating it.
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Old 03-14-2013, 10:38 AM   #10
jebjkey
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Just drive easy and you will be fine.
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