06-23-2021, 08:50 PM | #23 | |
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06-23-2021, 09:23 PM | #24 | |
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06-23-2021, 09:37 PM | #25 |
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06-23-2021, 09:43 PM | #26 |
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06-23-2021, 09:50 PM | #27 |
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06-23-2021, 10:47 PM | #28 |
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Okay, I still have a lot to learn. I had no idea it was okay to add flex fuel without a flex fuel kit. Is knowing the concentration of the flex fuel mix the only purpose of the Bend Calibration kit? What is the difference between the Benc Calibration kit and the Fuel It Flex Fuel kit?
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06-23-2021, 10:56 PM | #29 | |
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What you are doing is adding a bit of e85 to effectively bring up the octane of the gas. You’re not really making your car a flex fuel car, but the DME is compensating a bit for the added e85. More than a couple of gallons, then your car Will be unhappy. Hmm to make it really simple, think of lemonade that already has sugar in it but it’s not as sweet as you want. You then add a bit of honey to sweeten the lemonade, but adding too much will make it a honey lemonade which is not tasty. Haha weird analogy, I know. Try and read up on similar posts on e85 mixes to this engine. Just type “e85 f80” on Google and you’ll be some prior posts on this. You’ll probably see some of my posts as well! Good luck. |
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06-23-2021, 10:58 PM | #30 | |
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06-23-2021, 11:34 PM | #31 | |
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I didn't know that E85 was simply increasing the octane of the gas. Thank you for the analogy. I do understand about the flex fuel vs ethanol. I guess I should have replaced the words flex fuel in my last post with E85. I didn't think it was a good idea to put any E85 in the gas tank without a flex fuel kit. So is there any benefit to the flex fuel kits like Bend Calibration or Fuel It other than being more precise with your gas to E85 ratio? |
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06-24-2021, 12:14 AM | #33 | |
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When you add a couple of gallons of E85 (which has approximately 85% ethanol) to a full tank of premium unleaded (E10), you basically raise the ethanol content by a few percent - say up to E15 or E20. A completely stock F8x or one with a stage 1 or stage 2 tune will run totally fine with a couple of gallons of E85 mixed to a full tank of unleaded 91 octane gas. In fact, as you've experienced, it will run smoother because the octane is bumped up a bit. As you increase the percentage of E85 you mix with normal premium unleaded gasoline in the tank, the stock maps and the stage 1 and stage 2 maps are not programmed to take advantage of the higher octane provided so it does not run as well. There are also issues that come into play like the car needs to pump significantly more ethanol into the engine than normal gasoline. This is why cars running E85 or a mix of gas and E85 are less efficient and also why the stock fueling system can't handle running pure E85 - because it cannot pump and inject enough E85 into the engine to run properly. So, people mix the E85 with normal premium gasoline to not overtax the stock fuel pumps and injectors. If you want to run anything more than just a couple of gallons of E85 mixed with a full tank of premium unleaded, you will need a tune specific to the percentage of E85 you're running. The flex fuel kit has a sensor that can detect the percentage of ethanol in your gas tank and, with the right tune, will optimize the maps of the ECU according to how much or how little ethanol you are running. It is much more convenient as you don't have to worry about reaching a specific percentage of ethanol, which gets complicated and hard to do if you're filling up a tank that's half full and trying to mix in a certain percentage of E85 with normal gasoline and you don't know how many total gallons you need to pump to fill up the tank. |
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06-24-2021, 12:30 AM | #34 | |
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Great post! |
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06-24-2021, 12:46 AM | #35 | |
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Thank you, that helps a lot! If I start running a higher percentage of E85, I'll be switching to the BM3 Stage 1 flex fuel map. To address the increased load on the fuel system, would a high pressure fuel pump and larger injectors be required? What's the point of the new fuel lines included with some of the flex fuel kits? |
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06-24-2021, 12:59 AM | #36 | ||
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The upgraded fuel lines are not required either. You'll have a tougher time with flex fuel kits if you have aftermarket fuel lines since the bend calibration kit is designed for stock fuel lines. Once you start throwing in different types of AN fittings, the install will be a pain. You'll want to monitor your short term fuel trims in bootmod3 when doing an E85 mix (it should not deviate more than 5% from 1.0 (eg 1.05). Do NOT over fill with E85. Use the exact amount that is calculated and trust the math. Otherwise you'll run lean and get mixture codes and a check engine light. You might also want to spend the $150 and get new coil packs while you are changing out spark plugs to eliminate ignition issues with regard to troubleshooting any problems.
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2017 F80 M3 ZCP / AA GESI DPs / Akrapovic Evo / BBS FI-R 19" / Bend Calibration ECUTEK Flex Fuel | Bilstein B16 DDC + CS EDC / BMC Filters / BMS OCC / CSF HE / ESS CP / Nitto NT555R2 / PD Crank Hub / SPL Suspension / Uniden R7 / Wagner Top Mount IC
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06-24-2021, 03:12 PM | #38 | |
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Going to E85 means you get higher octane, allowing more boost and timing advance. However - as with all things - it comes at a price. The "energy density" of E85 is less than regular gasoline. Therefore, an increasingly greater overall volume of fuel is needed at any given moment when comparing similar performance of standard gasoline against increasing vol% of E85. tl:dr - the strain comes in the pump's inability to meet necessary volume demands when flowing E85
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06-24-2021, 05:43 PM | #39 | |
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Have we tried honey lemonade? I know my cough drops are honey citrus which is really just honey lemonade? Wait… what were we talking about again? |
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06-24-2021, 07:24 PM | #40 |
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As with tuning your car, you will be stressing the all components to their max. Turbos, fueling, ignition, cooling, etc.
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09-22-2021, 11:34 AM | #41 |
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I installed the Bend Calibration fuel sensor this weekend. Has anyone hooked up the Zeitronix ECA-2 to their car's FEM/Canbus? This is the part that makes me nervous and I can't find a good walk-through for the F80
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09-23-2021, 01:15 AM | #42 |
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Bend Calibration has a guide. Tap into passenger footwell module.
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09-23-2021, 01:18 AM | #43 |
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Here you go
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2017 F80 M3 ZCP / AA GESI DPs / Akrapovic Evo / BBS FI-R 19" / Bend Calibration ECUTEK Flex Fuel | Bilstein B16 DDC + CS EDC / BMC Filters / BMS OCC / CSF HE / ESS CP / Nitto NT555R2 / PD Crank Hub / SPL Suspension / Uniden R7 / Wagner Top Mount IC
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09-23-2021, 05:22 AM | #44 | |
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FWIW, there is a PT-CAN tap point that I found in the drivers side footwell based on looking at some wire diagrams, which would not require a harness extension. But I have been unable to find a suitable fire wall penetration point on the drivers side, at least not for 6MT cars…
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