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05-11-2011, 06:54 PM | #68 |
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11/4 to get 93.
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05-12-2011, 10:36 AM | #69 |
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Colorado is also a 91 octane state, but, given the altitudes and lower air density, 91-octane is closer to optimal than for those at sea-level. I've posted my dyno runs on PG's dyno thread. My car actually loses hp with 100% 100-octane. With experimentation, I found the optimal blend is roughly 70/30 blend of 91/100. My dyno is at around 5,400-feet above sea-level.
I limit my use of blend to autocross events. The gains are pretty small, but my baseline hp is 65-hp down from sea-level (due to low air density), so every little bit helps. For those in CA and other sea-level locals, going to pure 105-octane may or may not add more power than pure 100-octane. As I found out with multiple dyno runs, there's a limit where the engine will stop making more power and actually start to lose power. If it really matters to you, then invest a little time and money in comparitive dyno runs. The ole butt-dyno isn't really reliable. Dave
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05-12-2011, 12:28 PM | #70 |
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05-12-2011, 02:36 PM | #71 | |
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I know a couple of tuners in Colorado that love E85 and make great power on it due to the oxygen content to help with high altitudes.. |
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05-12-2011, 08:53 PM | #72 | |
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Performance was also noticeable in the low, mid, and high rpm range. As stated previously, there is almost no jerkiness initially from a dead stop. The power throughout the band is exponentially smoother than the feel with just 91 as well. Fwiw, this was just from my experience today and i am in no way an expert. Hope this helps.. |
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05-13-2011, 10:20 AM | #73 |
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So I went there last night, along with a couple other members based upon the posts above. It truly is a VP Racing fuel station. I asked who owns them, and they said VP. 100 octane and above are VP fuels. 91/87 octane are supposedly top tier refined gas (ie. Shell and Chevron).
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05-13-2011, 10:37 AM | #74 | |
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My BMW tech, who's a friend also, says that he's replaced injection systems in BMW 3-series that used E85 and would highly recommend against it in an M3 with a stock injection system. Dave
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05-13-2011, 11:47 AM | #75 | |
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LOL.. Maybe we are talking about the same guy (Adam from Revolutions)..? Did the BMW Tech need to replace the stock injection system because people are trying to put E85 in a non-flex fuel vehicle or a car that was not modified for it (Larger injectors & Tune for the fuel)..? What I'm trying to find out is if you guys are getting great results with a 91oct/race gas blend then why don't we get a few tuners to Tune for E85.. You will see additional benefits from the E85 and it will be in the $4 range compared to the $8-$10 91oct/race blend.. |
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05-13-2011, 12:27 PM | #76 |
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wow, I may be moving to California in a year. I am not looking forward to this. My car has been filled with 93 Shell consistantly for it's life...
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05-13-2011, 12:27 PM | #77 |
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That would actually get you 93.4. I blend in 12.7gallons of 91 and 4 gallons of 100. This gets you right at 93.15.
Dave
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05-13-2011, 12:28 PM | #78 | |
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A lot of shops carry racing unleaded. Dave
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05-13-2011, 12:33 PM | #79 | |
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Personally, I rarely fill up more than 14-15 gallons....don't like running the car on absolute empty.
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05-13-2011, 06:01 PM | #80 | |
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05-13-2011, 09:34 PM | #81 | |
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Dave
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05-13-2011, 10:53 PM | #82 |
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Wow that's true dedication man. Major props!
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05-13-2011, 11:16 PM | #83 |
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There's only one station that sells 100oct here in Hawaii ... I've always wanted to try it but also wondered how long that gas has been sitting. I know not many people use 100oct so I have a feeling that its been sitting for some time.
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05-13-2011, 11:48 PM | #84 | |
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When I had my GT500 I had an intake/pulley/and tune for 100 octane and that is where I used to fill up when I ran the 100 octane tune. If you want 100 octane, that is the place to buy it in SD. After reading this thread, I'm still hesitant to believe it's that big of a difference. My GT500 had custom tunes for 91/93/100 octane. It definitely made a difference, but that's because it was tuned for it. I find it really hard to believe that a stock car would make that big of a difference. I agree that the over oxygenated and ethanol injected fuels hinder performance, but enough for the "butt dyno" to register on a stock tune is hard to believe. Has anyone dyno'd their stock M's on 91 and >94 octane to register a real difference? I'm not trying to detract, but as an economist, I like to see real ceteris paribus proven results before signing off on $100/tank. Cheers, Jason |
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05-14-2011, 10:13 PM | #86 | |
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It's already been proven by pencil-geek's dynos...
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05-19-2011, 08:11 AM | #87 |
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05-19-2011, 08:22 AM | #88 | |
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The alcohol they put in that car will be overpriced and get worse fuel economy than gasoline. Even setting the price of Ethanol appropriately to make up for the loss in fuel economy is not adequate because of the hidden costs associated with providing the fuel in *this country* - subsidies for the corn industry; embargos on Brasil and any other lower cost producers. Although I have yet to see Ethanol offered at 25-30% less than gas - the picture above certainly doesn't show it. |
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