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      04-20-2016, 04:39 PM   #1
2jzinsider
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California vt2-650 setups 91 octane safe?

I might upgrade to a vt2-650. Is 91 octane safe for the kit? I'm located in California and thats all I have access to. Reason I ask is because the kit says it requires a minimum of 93AKI/98RON on the ess website.

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      04-20-2016, 07:22 PM   #2
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Even if safe, you will loose a ton of power. When I was out there for a month, even mixing it with 101 to get 93 car was loosing about 50hp. Cally gas is just terrible to boot no matter the octane
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      04-20-2016, 07:24 PM   #3
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Doesn't the ECU adapt to the fuel? So technically it should be "safe" but yes, squartus is right.

You will make less power on a lower octane fuel.
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      04-21-2016, 03:22 PM   #4
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I'm in the same boat. When I grow up, I wanna be like @longboarder lol
It looks like if you can't blend 91 with ethanol consistently, you may want to get a 625 kit.
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      04-21-2016, 05:07 PM   #5
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paging Longboarder

I believe he mixes E85 + 91octane to yield ~E30 with good results.
His car runs strong.
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      04-21-2016, 05:11 PM   #6
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Quote:
Originally Posted by elim11 View Post
paging Longboarder

I believe he mixes E85 + 91octane to yield ~E30 with good results.
His car runs strong.
+1 on this, he was just talking about it in another thread.
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      04-21-2016, 05:14 PM   #7
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Quote:
Originally Posted by elim11
paging Longboarder

I believe he mixes E85 + 91octane to yield ~E30 with good results.
His car runs strong.
I do mix but only 2 gallons of e85 with a full tank of 91. Basically the lowest amount of e85 to get to 93 octane. It results in maybe e18-24 depending on how much ethanol is in the 91 and how much 91 oct I need to fill up.
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      04-22-2016, 04:07 AM   #8
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I live in South Africa, where the highest octane available is 91. 90% of the guys that play with their cars here add pure ethanol to the 91 to up the octane rating.

On my fbo 335, i can run a 50/50 mix (25 litres 91 to 25 litres Eth).

Was just wondering, what % mix can I run on the m3? 50/50 still doable longboarder?
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      04-22-2016, 04:32 AM   #9
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We are lucky here in Australia, almost every gas station has the option of 91, 95 or 98 Octane

But unfortunately we pay double for cars!!
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      04-22-2016, 09:05 AM   #10
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Quote:
Originally Posted by Grk_M3
I live in South Africa, where the highest octane available is 91. 90% of the guys that play with their cars here add pure ethanol to the 91 to up the octane rating.

On my fbo 335, i can run a 50/50 mix (25 litres 91 to 25 litres Eth).

Was just wondering, what % mix can I run on the m3? 50/50 still doable longboarder?
That depends on how much capacity you have in your fuel system compared to the max power you are making.

Let me explain with a generic example (my numbers could be off they are just an approximation): if your max capacity is 500 wheel HP on conventional ethanol free gasoline and you are making 400 wheel HP on ethanol free gasoline, then e50 would require 15% more fuel compared to conventional gas (takes 30% more ethanol than conventional gas so at e50 is 50% X 30 = 15%) and 400/(1-15%)= 470 so in this case yes you could run e50.

If I were you I would test small amounts of ethanol and work your way to higher and higher levels using a wideband to measure AFRs.
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      04-22-2016, 10:43 AM   #11
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We have 93 here, does it make any sense to add some E85?
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      04-22-2016, 12:38 PM   #12
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Quote:
Originally Posted by BNBM3
We have 93 here, does it make any sense to add some E85?
93 without any Ethanol has been proven to be all you need (member m33too posted 10.4 @ 135 mph on 93 octane with ESS 625 kit 10psi).
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      04-23-2016, 03:03 PM   #13
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He had Special Tuning and New Injectors![IMG][/IMG]
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      04-25-2016, 10:46 AM   #14
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Same injectors. Different tune. Slicks. Slight weight reduction
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