07-13-2021, 02:53 AM | #1 |
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MHD FlexFuel Adapter (5 Minutes to FlexFuel)
I was running BM3 Stage 2 (ACN91) for the last year or so and it's been great and all but I wanted to try E85 AND I wanted an easy flex fuel option so I decided to give this CAN FlexFuel Analyzer a shot which also means trying out MHD tuning software.
Update 7/13/21: Just picked up the MHD CAN ECA PnP unit, didn't realize they're also in SoCal! Grabbed a OBDII WiFi interface as well. It's as fast as my OBDII lightning adapter without any wires: Update 7/13/21: Installed the MHD CAN ECA unit. Super easy. Re-flashed the MHD Stage 2+ E30 map to include that I have their ethanol analyzer and voila! (My guesstimated E30 mix I did last night wasn't too far off! reads 29-30%!) Update 7/13/21: I was not sure why the rolling anti-lag wasn't working (I am very used to it from BM3's version and apparently their video on YouTube is incorrectly stating to use the 'SET' button but I got a e-mail from MHD saying it's supposed to be the 'RES' button. Just a FYI for those wondering why it's not working. Update 8/13/2021 MHD just released version 3.4.0:
Update 8/18/2021: I decided to give my tuner a breather as we're running into some misfiring issues at the upper RPM range and give this MHD OTS Flex tune a try. I'm pretty damn impressed. The PSI is a bit on the low side 18-19PSI (I need to log it to validate for sure) but it is everything you'd expect from a mature OTS map. Idles smooth, starts smooth, and more than likely long term durable. What's cool: Their flex option works with multiple CAN ECA sensors, doesn't even have to be MHD's option from Bimecu. I can't stress how great this is for a OTS feature. Nobody else does this. What's not so cool: I do wish they allowed you to apply the Flex option to any of their OTS maps without having to use the multimap option but that's the way it's setup right now. So, since I care less about having multiple maps, I just placed the same map in all 4 slots. Definitely read the manual but the way it works (if you want Flex) is you need to select 4 OTS maps for each 4 slots and not a single one of them can be a E-map (i.e. their S2 E85 map or the S2+ E30 map). Has to be normal fuel maps only. The Flex option then takes into account the levels of ethanol you have in your tank and modifies the fuel map you have accordingly based on Stage you selected, etc. It's quite robust. Last edited by slaughter.mode; 12-13-2021 at 09:05 AM.. |
07-13-2021, 12:42 PM | #2 | |
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With respect to the OTS Stg. 2 setup, it sounds to me like you are saying that MHD stage 2 runs a few psi higher than BM3 stage 2? Also, with respect to E85, did you ever compare it to the BM3 E85 maps? Otherwise, are you comparing apples to apples? Lastly, for current BM3 owners, would you recommend MHD OR custom tuning via BM3? Thanks.
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07-13-2021, 03:50 PM | #3 |
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I've been using MHD on several different BMWs (E and F) chassis. Never had issues, only smiles. Simple to use, convenient app that allows you to switch maps in the matter of seconds. Whoever I come across with BM3 is always in my rear view and they think I run custom tunes. MHD> BM3 any day of the week.
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07-13-2021, 04:49 PM | #4 | |
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I never tried a BM3 E85 map because I didn't want to pay for it. At that point I'd have paid a tuner, which I was planning to, until I found this MHD flex fuel option. Can't really compare a OTS tune (BM3 or MHD) vs. a custom tune. Custom tuning with a reputable tuner is always the way to go for the best / safest improvements but if you're ever going down the Flex Fuel route and you want to keep it simple and as DIY as possible, MHD + their Ethanol CAN PnP solution is going to be the clear choice. |
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07-13-2021, 06:40 PM | #5 |
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Believe me if you added 4-6psi on top of any OTS map for 91 octane you’re kicking the shit out of your motor. 91 can’t take 26-28psi especially on an OTS map that’s meant to work on POS Arizona or Cali 91 octane, period. But whatever makes you happy or rocks your boat dude. If that works for you and doesn’t knock the just flash a Stage 2H OTS map and its like 24-25psi instead of 20psi
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07-13-2021, 07:25 PM | #6 | |
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Last edited by slaughter.mode; 07-13-2021 at 07:50 PM.. |
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07-14-2021, 01:39 AM | #7 | ||
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07-14-2021, 01:43 AM | #8 | |
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To be fair, though, I don't have stock turbos. |
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08-13-2021, 07:01 AM | #9 |
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I did some road testing on the Stage 2 E85 OTS map and it is impressively fast and smooth. Holy crap. It's giving me about 22-23PSI and it idles so smooth it feels like the car is off. This is great and even greater that it's free.
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Last edited by slaughter.mode; 08-13-2021 at 12:06 PM.. |
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08-14-2021, 05:58 PM | #10 | |
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Anything beyond E50 on the stock fuel system needs boost to be scaled back to keep the pumps happy.
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08-17-2021, 12:51 PM | #11 |
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Update: I'm getting into the final revisions of my custom tune and with a rather modest 23PSI on E75 (ECA reading). Dyno today read 600whp (4 pulls). The difference between each pull was 1-5whp tops and I'm going to thank the Mishimoto charge cooler along with the CSF heat exchanger for that. Pretty awesome stuff. Had some un-registered mis firing in the upper RPM limit (ECA readings were clean) but we'll sort that out.
We have 5-8 PSI to go. I'll post the final dynos when we get there.
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08-17-2021, 02:25 PM | #12 | |
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08-17-2021, 02:25 PM | #13 |
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Not sure if I missed it but who's tuning your M?
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08-17-2021, 02:26 PM | #14 |
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HAHAHA, man look at the times for both our posts!! Can't believe we were thinking the same thing.
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08-17-2021, 02:26 PM | #15 |
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I haven't disclosed who is tuning, per their request. But not Cary Jordan if that's what the question is. LOL.
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Last edited by slaughter.mode; 08-17-2021 at 02:32 PM.. |
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08-18-2021, 01:31 AM | #16 |
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LOL no, didn't think it was him. All good
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08-18-2021, 10:41 AM | #17 |
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Update 8/18/2021:
I decided to give my tuner a breather as we're running into some misfiring issues at the upper RPM range and give this MHD OTS Flex tune a try. I'm pretty damn impressed. The PSI is a bit on the low side 20-22PSI (I need to log it to validate for sure) but it is everything you'd expect from a mature OTS map. Idles smooth, starts smooth, and more than likely long term durable. What's cool: Their flex option works with multiple CAN ECA sensors, doesn't even have to be MHD's option from Bimecu. I can't stress how great this is for a OTS feature. Nobody else does this. What's not so cool: I do wish they allowed you to apply the Flex option to any of their OTS maps without having to use the multimap option but that's the way it's setup right now. So, since I care less about having multiple maps, I just placed the same map in all 4 slots. Definitely read the manual but the way it works (if you want Flex) is you need to select 4 OTS maps for each 4 slots and not a single one of them can be a E-map (i.e. their S2 E85 map or the S2+ E30 map). Has to be normal fuel maps only. The Flex option then takes into account the levels of ethanol you have in your tank and modifies the fuel map you have accordingly based on Stage you selected, etc. It's quite robust.
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Last edited by slaughter.mode; 08-18-2021 at 10:46 AM.. |
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08-18-2021, 12:08 PM | #18 |
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Is misfire plug gap related, coil or a bad injector? Any codes?
Sounds like MHD has the OTS full E maps sorted nicely for the masses.
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08-18-2021, 12:20 PM | #19 |
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None of the above, it's custom tune related. I have no issues with OTS maps...they have been flawless.
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08-18-2021, 02:07 PM | #20 |
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Levan from Bimmer ECU Solutions here,
If anyone has questions regarding our Kit, will be happy to answer questions |
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08-18-2021, 09:34 PM | #21 | |
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Kind of a boring video but my tank is full E85. After this erratic movement from the CAN sensor, it is now permanently stuck at 14% and I'm glad I'm on the OTS E85 S2 map or I'd be really having a rough time since flex tunes adjust and adapt based on this reading.
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08-19-2021, 12:29 AM | #22 |
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The replacement module is already on the way that fixes the issue
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