02-14-2020, 12:10 PM | #23 |
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my stage 2 acn91 agg San jose with shell v power. datalog
m235i
vrsf FBO kit/ m2 muffler halim said that fuel octane is very bad. was told to go to a different pump station. i think i'll be doin 93 octane with 101 and 91 mixture for my next datalog for him. im wondering if its oem my spark plugs http://www.bootmod3.net/log?id=5e461272d10b432feef14a9b |
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02-14-2020, 12:53 PM | #24 | |
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There are 5 oil refineries in the Bay Area, in order of size (No. of barrels processed per day):
At that time I tried Chevron, Arco (Marathon), Shell, Valero, 76 (Philips), and Costco stations. They all performed identically, and identically bad. I tried 1 step colder plugs, and they're an improvement, but nothing to write home about. I probably wouldn't bother if I were doing this again. I experimented with mixing E85 to create E blends on the OTS 91 map (ACN 91 OTS map wasn't available at the time), and found that E20 improved things to just about acceptable with this map, but really a little more octane (E value) would have been better. When I went over E20 my HPFP ran out of pressure but that's an option if you don't mind blending for every tank. I believe in CA we're left with four options to this problem:
A good, progressive WMI kit will allow you to run the 93 OTS map safely because it boosts octane, fuelling and lowers IATs. It's also really cheap for a daily driver. 1 gallon of 50:50 water:methanol lasts for about 2 tanks on the street (would be used much faster on track), and 5 gallons of Methanol costs bout $35 - Less than $2 per tank for street driving. Blending race gas is a good option, but it's very expensive and it's difficult to find race gas (though certainly not impossible, I know of a few stations in the Bay Area). One thing to keep in mind is that octane doesn't mix linearly. What I mean by that is that if you mix 1 gallon of 91 AKI with 1 gallon of 101, you don't necessarily end up with 96. When I tried this I got closer to a 93 AKI result with 50:50 race gas, and that's an expensive proposition for a daily driver. Octane boosters have been used effectively by some users on this forum, but I didn't want to go that route. It's in between the price of WMI and Race Gas blending, but it turns the inside of your engine, turbo and exhaust system orange, and the long term consequences of that concerned me.
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2018 ///M2 LCI, LBB, 6MT...
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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02-17-2020, 10:24 AM | #25 | |
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thanks for the response. i feel like part of my just wants to jump the gun and order a custom tune. i believe that if im going that route. the tuner can tailor my tune around the shitty gas we have. but it's safer, could possibly have more power, and more convenient than doin methanol injections. california gas a bit*h. i usually fill at shell in the east side of san jose. it sucks that the acn91 OTS don't feel like they're OTS but its not their fault though. what do you think of my datalogs. were they similar to yours? datalogs 4th gear pull http://www.bootmod3.net/log?id=5e461272d10b432feef14a9b rough idle?? http://www.bootmod3.net/log?id=5e479727c090c640543734de |
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02-17-2020, 12:46 PM | #26 | |
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A custom tune won't give you any benefits if this is what you're seeing with the ACN map. I had a tuner offer me a custom tune for free a year or so back, but he was basically offering to remove over-boost from the stock map to increase safety with our fuel. I think the thing you need to understand is that with CA 91 fuel, regardless of the gas station (within reason), doesn't even allow the stock map to make full power. If you're looking for more power, you need to address the octane issue first. A custom map won't do that for you at all. I don't want to imply that a custom map isn't worthwhile... It absolutely is, but only once you have the supporting modifications to allow the custom map to make any difference at all. My suggestions would be the following, if you've not done them already:
Obviously, you know the route I took, and I have a whole thread about my install and setup. I'd be happy to meet up and show you the install if you're interested, but there is not a lot to see because I kept it looking as stock as possible.
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2018 ///M2 LCI, LBB, 6MT...
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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02-17-2020, 01:05 PM | #27 |
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Man I feel for you guys getting such shitty gas
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02-17-2020, 01:14 PM | #28 |
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It's sad, yes, but I suspect that even your fuel is worse than that in Europe I'm afraid.
This really wasn't an issue in the past, but with the trend for smaller, forced induction engines, it's really becoming a big problem. Apparently there is a balance between cost, smog prevention and octane. E85 is probably a good solution, and may be why a lot of US cars are flex-fuel from the factory. It's those of us with European cars that are suffering the most currently.
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2018 ///M2 LCI, LBB, 6MT...
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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02-17-2020, 02:46 PM | #30 | |
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I think the N55 is limited first by octane, then by turbo, then by fueling. If you fix the turbo and / or fueling you can shift the octane restriction up a little, but not by much. The good news is that we now have somewhat affordable HPFP, Turbo, and Meth injection setups... Big power is possible but it does seem to require all three, especially in the US.
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2018 ///M2 LCI, LBB, 6MT...
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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02-17-2020, 02:53 PM | #31 | |
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02-19-2020, 12:13 PM | #32 |
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i see. i have all the supporting modifications but spark plugs.
i might be swapping out my BMS intake for OEM, ive heard issues with people running lean on our cars because of it. ive always thought the aftermarket intakes Assists the turbo by making sure it gets enough air on higher boost. i just couldn't understand how it would affect my AFR when air is controlled by a different entity. I have not swapped the spark plugs out yet. i will be doing it somewhere down the line. i'll be ok running the OTS just fine without my pistons crying for help right? after all the ECU is still smart enough to keep it from actually knocking and killing itself mods: VRSF FMIC,BMS INTAKE, VRSF DP AND CP. |
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06-15-2020, 09:46 AM | #33 |
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To any that are still interested. Took some more logs today.
I don't know anything about interpreting the data though so hopefully someone can chime in. It would be appreciated. Stage 1 ACN91: https://www.bootmod3.net/log?id=5ee7...0b435ebe9ff00a Stage 2 ACN91: https://www.bootmod3.net/log?id=5ee7...0b435e39affe92 https://www.bootmod3.net/log?id=5ee7...90c62d8734894b |
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06-15-2020, 02:19 PM | #34 | |
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06-15-2020, 02:22 PM | #35 | |
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2018 ///M2 LCI, LBB, 6MT...
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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06-17-2020, 04:35 AM | #36 |
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That's actually a lot better than I was expecting! Especially for the gains you get due to the limitations of the bad gas here in CA.
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06-22-2020, 02:20 AM | #37 | ||
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06-22-2020, 05:44 AM | #39 | |
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10-01-2022, 07:40 AM | #40 | |
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I have an E85 station nearby, can I just do Emix with shitty CA 91octane to about E18-E23 to run regular Stage 2 OTS 91 or stage 2 ACN 91 map nice and steady? stock fuel system stock turbo everything else upgraded thank you |
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10-01-2022, 07:44 AM | #41 |
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10-03-2022, 08:32 PM | #42 |
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