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Old 01-18-2019, 12:08 AM   #201
Stija
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For the record, e30 is about 95(r+m)/2, 94.4 precisely. Like I had said, ethanol will provide all the knock and detonation prevention, that's the point of it. I'm trying to help you goodys..

But again, you can put whatever you want in your car cuz someone said it would help, and it will if you believe it hard enough. Superstitious people are everywhere.

ADDED: on top of it being 95aki it is in practice acting as if its aki rating was much higher than that due to its cooling effect and slow burning. That's the point of running an e30 tune/fuel.
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Last edited by Stija; 01-18-2019 at 12:32 AM.
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Old 01-18-2019, 12:41 AM   #202
GlarryHoodDIT
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If you start with 87 Octane E10 and you add enough E85 to reach E30 you will have an effective Octane rating of 90-91.

If you start with 93 Octane E10 and you add enough E85 to reach E30 you will have an effective Octane rating 95-96.

This isn't a question of fear mongering or feeling good. It's a question of running the highest possible octane you can when putting 300-350whp.

Not all E30 is created equal.
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Old 01-18-2019, 01:01 AM   #203
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This guys probably talking crap about me..

Repeat after me everybody, e30 aki rating is 95, but because it cools as it draws into cylinders and cuz it burns slow it is much higher in practice.

NOT open for debate. Fact.

But you are welcome to pour 91 or 93 or 94 octane to increase knock resistance...

AKI Increase // Ethanol by Volume %
1.0 - 1.5 // 5.7%
1.5 - 2.5 // 7.5%
2 - 3.5 // 10%
3 - 4.5 // 15%

source: https://ethanol.org/KMoore%20Octane%20ACE%202016.pdf
ADDENDUM FOR FUN: I wish I had a source from someone phone's Instagram instead.

Last edited by Stija; 01-18-2019 at 01:09 AM.
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Old 01-18-2019, 01:14 AM   #204
Stija
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Quote:
Originally Posted by Atomic Wrx View Post
Would it be possible to run a ethanol reader in the car to help make sure you have good content
Why stop there? Once you have that you are more than half way to your own flex fuel kit, just need an AP and a pro tune afterwards to take full advantage of it
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Old 01-18-2019, 09:07 AM   #205
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I'm enjoying this discussion. Lots to learn, after years of avoiding ethanol completely.

Moore's PDF indicates that the ethanol fuel's AKI depends on the base fuel it is blended with. The chart doesn't list the AKI increase of E30, but we could extrapolate (assuming it continues to be linear) and guess it adds 6-9 AKI.

Therefore it appears that a 70% base fuel (85AKI) and 30% ethanol has a final AKI of 91-94. A 70% base fuel (93AKI) and 30% ethanol has a final AKI of 97-102AKI.
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Old 01-18-2019, 09:55 AM   #206
Stija
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If I had to take a guess I’d guess that any premixed blend is mixed with 85/87aki.

BUT you’re missing the point. Even though e30 aki may be 95, it acts as though it was much higher, like 110 (made up number, maybe higher) due to its cooling effects.

Think about The whp increase that e30 allows compared to race fuel for example, even though race fuel may have higher aki rating, e30 will give you better gains. Why do you think that is? It’s not just about the aki number.

Last edited by Stija; 01-18-2019 at 10:03 AM.
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