11-07-2021, 12:36 PM | #45 | |
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The 2+ E30 multimap has several more degrees of timing, while the 91 tune is achieving a couple degrees higher boost in the upper RPMs with less timing. I'm guessing the E30 2+ tune feels quicker but looses steam up top, while the 91 is slower and feels more consistent. This begs the question of if you run the 2+ E30 multimap and then go to regular pump gas, will that more aggressive tune scale back to compensate? And if so, to what? I'm still rather confused about all this. I just want to be able to make more power on the E30 2+ multimap with higher ethanol mixes, and then Stg 2 93 OTS like power when using 93. |
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11-07-2021, 01:22 PM | #46 | ||
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I'm assuming that the FlexFuel MultiMap Stage2+ E30 tune will act like the regular Stage2+ E30 tune if it is given less than E30 for fuel- not good! Like giving a 93 tune, 91 octane fuel. I have similar goals. I'd like the FlexFuel tune to scale up and give me the highest performance that it can based on the percentage of Ethanol that it receives. At the same time if I get stuck like last week without access to E85, I just want to be able to pump 93 or even 91 into the tank and have it adjust automatically. Switching between the MultiMap Stage2 tunes really was a breeze. 91ACN <-> 91 <-> 93 Hold down the cruise control button for 3 seconds and the tach needle jumps up to 1000, 2000 or 3000 to indicate which of the three tunes is running. Hold it down and use the cruise control up/down switch to change tune. Very easy! But the Stage2+ E30 is not a choice. Have to flash the MultiMap Stage2+ to obtain that choice, and then you don't have the other 91 and 93 choices that are only under MultiMap Stage2. If my wife calls me saying that the station is out of E85, I don't have the option of telling her to flash a different tune. That would be suicide on my part! 😀 |
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11-07-2021, 05:47 PM | #47 | |
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At a quick glance it looks like johnung targets 1.5-2° degrees more throughout but the boost target is much lower. https://www.bootmod3.net/log?id=615c...0b4355c23158d0 |
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11-07-2021, 08:43 PM | #48 |
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So i have all the logs in excel and need to figure out how i am going to automate my review to easily compare relevant parameters. In the meantime i threw them in VD. Power looks very consistent between each stage, with the 2+ making only a little more than the stage 2. Clearly the flexfuel is adapting automatically between the different octane settings within a stage which is why they are all so similar.
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11-07-2021, 09:03 PM | #49 | |
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These logs were all using E50 fuel. I'll run down the tank and get some logs with E65/E70 and later E85. |
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11-08-2021, 12:57 PM | #51 |
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per ptf website,
"In this demo, we're demonstrating on a 2015 BMW F80 M3 which starts out with a 20% ethanol blend in the tank. Those that enjoy the details can see the blend factors are set for 0.50 for this ethanol level just as an example. Currently there are 3 main blend factor tables, ignition, fuel and torque, and they can be individually used to scale among many tables required for tuning Flex Fuel, from cold starting the car with full ethanol in the tank to full on power. In the end of the video we add some more alcohol and you can see in the bootmod3 dashboard how the Flex % goes upwards from 20% to 27% as the fuel system catches up and the fuel in the tank gets a chance to blend as it isn't instant." i took a look at the map editor to get more details on the blend factors and here it is: you build your 3 individual tables of ethanol content (0 to 100) vs blend factor (0 to 1). ignition = timing advance factor fuel = lambda factor torque = "maximum permissible clutch torque" factor i believe the question was whether or not boost is part of the equation as a response to ethanol content. i think the answer to that is same answer of whether or not boost is part of the equation for 'maximum permissible clutch torque'. i'd say yes. at the end of the day the dme is just trying to reach the torque target within the individual limits of boost, timing, and overall torque.
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11-08-2021, 01:23 PM | #52 | |
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Your log targets a flat 20.8 psi across the RPM. His logs on both stage 2+ E30 and 2+ multimap go from about 16 psi at low RPM to 20.6 psi in the upper RPM. Not sure why his boost target would be different than yours on the 2+ E30 map unless you modified something or are running a different version. |
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11-08-2021, 02:02 PM | #53 | ||
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11-09-2021, 10:13 AM | #54 | |
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All my 2+ logs target 20.6-20.8, I did notice the HPFP target is 2400 psi in some while 2800 psi in others Last edited by 5w20; 11-09-2021 at 10:20 AM.. |
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11-09-2021, 10:33 AM | #55 | ||
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11-09-2021, 01:24 PM | #56 | |||
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Now the logs that I posted were all done with E50 in the tank. So there would be whatever differences are normal in the logs if the engine is receiving a higher octane fuel. Like giving a 91 octane tune, 93 octane fuel. |
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11-09-2021, 01:37 PM | #57 | |
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I made a little progress on looking at your logs yesterday. I decided to write a script to automate things so that im not just using excel. That way i can easily look at more things/different logs in an automated fashion in the future. I'll keep chipping away at it as i have more time. The key thing will be plotting one parameter at a time vs RPM across all logs (each log as a different line on said graph). |
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11-09-2021, 02:48 PM | #58 | ||
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The BM3 settings that I have that may be different than his are: Both TMAP sensors are 3.5bar HPFP is Dorch2 Burbles are set to none. But don't know if any of those things could change target values |
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11-09-2021, 02:50 PM | #59 | |
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11-09-2021, 06:03 PM | #60 |
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johnung Your logs are indicative of needing the XHP trans tune, as your boost targets are being limited since your BM3 trans tune doesn’t lift torque limits enough. My stg 2+ logs looked like yours until I went with XHP. See logs in the other 2+ thread for comparison. You’re missing out on tons of power. I hit over 475 RAM tq at clutch actual values and you are at like 400.
Also wanted to say that if this tune doesn’t scare you a bit, then something is wrong as it is dramatically faster and explosive in it’s power delivery, especially as you up ethanol percentage past 50%. I have E67 on Stg 2+ E30 CustomRom LiveAdjusted to that E% in the tank now and it’s a new level of fright from about 2K till a touch past 6K. Here’s a log with multiple pulls with E60. https://www.bootmod3.net/log?id=6186...90c6283fe0a8da Last edited by ctt300; 11-09-2021 at 06:34 PM.. |
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11-09-2021, 07:04 PM | #62 | |
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Right now I'm testing with E50 in the tank because I can use all of the FlexFuel tunes including MultiMap Stage2+ E30 and the standard Stage2+ E30. Next I'm going to try the FlexFuel MultiMap with E65/E70 and E85. Im curious what your configuration is, especially which FMIC you are using since I need to upgrade. Thanks. |
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11-09-2021, 07:10 PM | #63 | |
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I think you know this, but you have to be flashed with either a Multimap tune or a CustomRom converted tune that can be any OTS tune -to convert go into “My maps” and choose any tune and then at the bottom is a button to “CustomRom Convert.” Then it is flex-fuel capable and can also be overridden manually with liveadjust E %. |
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11-09-2021, 07:20 PM | #64 | |
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Another newbie question: Since Live Adjust isn't available unless you're connected to the car, do yo have to manually adjust every time you start the car, or can you save the Live Adjusted tune as a new map, e.g., Stg 2+ E60? |
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11-09-2021, 07:31 PM | #65 |
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johnung Its the CSF intercooler…think there is only one. Reg price is $599, but can find for $499 I believe. It’s excellent and drops IAT through pulls. No increased lag.
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