Safe to run 100 Octaine? - Page 2 - Subaru WRX Forum
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#16 Old 07-18-2013, 12:59 PM
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During my last tuning session, I was told that it would be a good idea to throw a gallon of race gas in with my regular 93 if I intend to take my car to the track for added safety.

John
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#17 Old 07-18-2013, 02:03 PM
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octane allows the tune to push a little further with timing and boost while avoiding knock. Higher octane on days when you intend to abuse the car more than normal provides a little extra cushion of safety.

Any WRX will see gains being tuned for 93 instead of 91 or 100 instead of 93 but the tune doesn't change so it cannot unlock additional potential in higher octane gas than it was tuned for.

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#18 Old 07-18-2013, 02:50 PM
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Still back to the same issue haha I can only get 100 and not 93, only 91 or 100
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#19 Old 07-18-2013, 03:27 PM
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Still back to the same issue haha I can only get 100 and not 93, only 91 or 100
Then you tune for 91 and a sep map for "E85 mix" (50/50 meaning e85/91oct)

Some may doubt and think differently.... but it's safe this way....

Like Daniel stated.... helps with knock....

I'll be honest here... I have no tune on the Foz and I'm pretty sure it's a stock tune... but I can throw 1-2 gal of E in a full tank of 93 and I IMMEDIATELY feel a boost in power... I hook it up to the dashhawk and I see it lean out a bit (11.9-12.1) on WOT runs due to the specific fuel gravity and IDC ..... This is on a stock car other than a drop-in filter..... Take it for what it's worth. I have some bad heat here.... and not wanting to get an AP at the moment.

this is from a narrowband that is on the FOZ

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#20 Old 07-18-2013, 05:36 PM
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Glad I posted information in this thread....

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#21 Old 07-18-2013, 07:04 PM
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Glad I posted information in this thread....
We saw it big dog
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#22 Old 07-19-2013, 07:37 AM
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I would not combine fuels except to add a little octane cushion when you're tuned for the main fuel. But that's just me.

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#23 Old 07-19-2013, 09:47 AM
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I would not combine fuels except to add a little octane cushion when you're tuned for the main fuel. But that's just me.
So you'd never run a 50/50 mix of E85 and 93?

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#24 Old 07-19-2013, 12:04 PM
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I know people who do, I would not. Too much variation in octane.

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#25 Old 07-19-2013, 12:28 PM
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Agreed. That's why it makes more sense as a racemap as opposed to everyday map IMHO.

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#26 Old 07-19-2013, 01:31 PM
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Nothing wrong w running E85. I no a few guys that been running it for a few years.

You only run over the summer. Labor Day-back to pump gas

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#27 Old 07-19-2013, 02:59 PM
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Nothing wrong w running E85. I no a few guys that been running it for a few years.

You only run over the summer. Labor Day-back to pump gas

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You do realize that even during the summer the oct rating on E85 can differ widely.

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#28 Old 07-19-2013, 04:28 PM
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You do realize that even during the summer the oct rating on E85 can differ widely.

Since June 1 it hasn't dropped at all. I still test and haven't seen a drop lower


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#29 Old 07-19-2013, 04:31 PM
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How do you test yourself? It's not all about octane. Our octane is a composite MON and RON number anyway. There are other things to consider with ethanol as well.

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#30 Old 07-19-2013, 04:56 PM
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I've tested E before.... they sell kits online.

I know it depends on region.... some differ more than others FWIW

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