07-07-2018, 03:28 AM | #1 |
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E30 Calculator, question
Wanted to double check my calculations before going to E30 (bm3 map)
Our file is 98 Ron with 2-3% ethanol(Max 5%) Using the online calculator I got the following. Unsure if it uses Ron or us measurements. Got a ratio gas:ethanol of 1:0.45 Does this seems correct or am I wrong? http://www.georgebelton.com/E85Calculator.php Link to calculator I used |
07-07-2018, 09:12 AM | #2 |
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I think that calculator was designed for AKI, and US gallons (3.78 litres), but that does matter. It assumed a linear calculation of octane based on your input figures and a ratio of volume as well. You could put your data in in litres and it would still work fine.
Having said that, as far as I know, the AKI of E85 is 105; the RON is higher. So you may be mixing your octane ratings; do you care though? All you're trying to find out is the ratio you need. Resultant octane is just nice to know. By the way... I'm not sure of anyone who has got the E30 map to run on E30 in an M2. I'm currently trialling E20 California fuel with the 91 AKI OTS Stage 2 map and getting good results. When I tried E30, my HPFP couldn't keep up with the additional fuel needed. This happened the first time I tried a third gear pull! You might be lucky though, but be prepared to add more regular gas when you test... Don't fill your tank with E30 just in case it doesn't work out.
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07-07-2018, 09:57 AM | #3 |
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Thx for the input.
Getting confused as the info on our Swedish E85 says Ron 95. Should be a lot higher if I understand correctly. My gas is 98 Ron, 2-3 ethanol. |
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07-11-2018, 01:18 PM | #4 | |
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07-11-2018, 03:32 PM | #5 |
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I tried it a month or so ago at about E25 and didn't have an issue other than fuel disappearing faster I only have one station I know of with it so I don't run it a lot since I can't get it when I am hammering the mountains.
I just filled up with E30 by the calculator. I left the "at least 10% eth" set at 10 so then to be at E30 the m2 would be 10 gal 93 & 3.7 gal E85. So thats what i did Reflashed the car to stg 2 E30 and will see what happens |
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03-18-2019, 09:13 PM | #8 |
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I am finding E30 is ok on stock fuel pump, I am catless no other mods.
I read somewhere else that running 98RON on the E30map was also ok but I can't imagine the timing would be the same. |
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03-22-2019, 11:56 AM | #9 |
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You can run 98RON on the E30 map if you're on your way to add some E85 but definitely not for Wide Open Throttle. 98RON full time should be used with 98RON map.
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03-22-2019, 12:22 PM | #10 |
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Word 98 ron is just 93aki and the OTS tunes for e30 have a cap on timing 2-4 * higher (Believe 12 vs. 9-10).
In cold weather were there is a higher fuel requirement running e30 ots map w/o ethanol content sensor may result in some minor boost or timing pull...
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10-01-2022, 06:16 PM | #11 | |
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also, to calculate Emix ratio, do you assume our 91aki as 89octane or 91octane. thank you |
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10-02-2022, 02:14 PM | #12 | |
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I never found a combination of E85 and CA 91 AKI that resulted in no knocks detected. Pushing to E20 improved things, but it made fuel consumption worse, and if I went too far, I ended up loosing pressure from the HPFP because it's already at its limit. I did an Aquamist Methanol Injection install a couple of years back and it 100% solved the octane problem for me. I don't use the car as much as I used to, and I find that a windshield washer reservoir (about 1 gallon) of 50:50 methanol:distilled water (by weight) lasts for 2 or 3 tanks of fuel. It's been rock solid since I did the install and though I'm not happy that the CA fuel is so bad, I'm happy with the reliability and discrete install I did of the Aquamist setup. My plan if I get back in to modding, is to upgrade the turbo, but I'm seriously considering not bothering. The BM3 maps that added the lag between shifts fix are good, but a new turbo might need a custom tune, and all of the tuners that I asked in the past were unable to add the lag between shifts fix. Without that fix, the drivetrain behaviour is just so frustrating.
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Current Performance Mods: CSF FMIC, ER CP, Fabspeed Cat, Aquamist WMI, GFB DV+, NGK 97506, BM3 (Stage 2 93 OTS), CDV delete, UCP, M2C/M3/M4 Strut Brace, M3/M4 Reinforcement Rings |
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10-02-2022, 08:13 PM | #13 | |
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1. If I'm going for more power, I definitely need to start researching Injection method like yours 2. If I'm going conservatively, probably just get a custom 91ACN stage 2 tune. and try to enjoy every bit HP I can get from it. What a waste for all those Bold-ons we have LOL. I feel suck. Still thanks for your help. |
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10-03-2022, 05:15 PM | #14 | |
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Methanol injection isn't as scary as many think. As I said, my system has been 100% reliable for over two years now, and it cost about $1,000 to do an install that is totally seamless and reversible. I went to the trouble of building custom harnesses so that I didn't have to cut any stock wiring, but if you don't do that, it's probably even cheaper. One thing I would suggest, is to get a system that isn't just dumping in Methanol and as therefore more progressive in how it operates. The Aquamist system I have takes its cues from cylinder one injector PWM duty cycle. What that means is that the methanol load is directly correlated with regular fuel load. With any methanol system, the DME doesn't know that the system is there, but if the fuel and methanol are correlated, the DME just sees a little more fuel and octane, and can trim behaviour accordingly. This is in contrast to systems that add methanol based on boost pressure, which can be great for cooling the intake, but end up over-richening the mixture because the DME can't adapt.
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Current Performance Mods: CSF FMIC, ER CP, Fabspeed Cat, Aquamist WMI, GFB DV+, NGK 97506, BM3 (Stage 2 93 OTS), CDV delete, UCP, M2C/M3/M4 Strut Brace, M3/M4 Reinforcement Rings |
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