01-19-2024, 06:12 AM | #1 |
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Any BM3 tuning discussion thread here?
Just unlocked and flashed my Y20 m40i with BM3 stg1.
It is a lot of fun logging and testing. But a lot of questions, too. I am on ACN 91 gases and had a large amount of timing pulls on ACN 91 stg 1, which is supposed to be very conservative. Surpassingly the stock tune has even worse timing pull. Trying to figure out if it's the engine's problem or the fuel is beyond crappy. The car feels quite different and the bubble is awesome. But at WOT I couldn't tell if there's major power improvement. 0-100 pull only shows ~0.2s improvement tested multiple (10+) times. Is that expected? (how am I gonna get any closer to suby's 3.2s??) I saw 3 series forums have dedicated threads to discuss BM3 logging and advices. Do we have a similar one here? |
01-19-2024, 07:50 AM | #2 |
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Fuel does make a difference. I run E85 that alone is 100+ HP in just a fuel tank. Next is you need a downpipe. Catless for best results. The B58 needs air flow and the DP is the best 1st choice. Youre on all stock hardware with stage 1 thats just allowing you to go a small bit beyond stock. BM3 stage 2 even 93 is where the party just starts. Post a datalog link also. Im curious to see how it looks on your stock setup.
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vrships109.00 earlgsxbusa130.50 |
01-19-2024, 09:02 AM | #3 |
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Going to ship the DME on my 2023 soon to FEMTO. Looking forward to a stage 2 Bootmod3 flash.
Current mods are Active Autowerke catted downpipe and SuperSprint catback. MST intake as well just for noise.
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01-19-2024, 03:28 PM | #4 | |
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2019 BMW X3M40I
Paul Johnson Tunes/ACX Solutions Shop/Development Car, XHP stage 3 with custom settings, CTS Downpipe, intake, Chargepipe, turbo inlet, coils, Nostrum Stage 1 Injectors and Nostrum Big Bore HPFP, Vargas PCV and Oil cap, HnR springs, ACX Rear poly bushing, ACX Intake scoop |
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vrships109.00 earlgsxbusa130.50 |
01-19-2024, 03:29 PM | #5 | |
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2019 BMW X3M40I
Paul Johnson Tunes/ACX Solutions Shop/Development Car, XHP stage 3 with custom settings, CTS Downpipe, intake, Chargepipe, turbo inlet, coils, Nostrum Stage 1 Injectors and Nostrum Big Bore HPFP, Vargas PCV and Oil cap, HnR springs, ACX Rear poly bushing, ACX Intake scoop |
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01-19-2024, 05:03 PM | #6 |
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Ethanol(hello timing!), downpipe, and xhp is all you are missing for a good time! Might also invest in a flex fuel kit in case ethanol is not readily available.
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01-19-2024, 10:08 PM | #7 | |
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The timing is actually more conservative on stg1 surprisingly , making only 4 degrees after the correction at 6500rpm, while below 4000 rpm the timing was mostly zero or negative. The stock tries harder on timing but has correction 6-7 degrees for all cylinders and occasionally some knocks. LolThat looks quite concerning. Stock map: https://bootmod3.net/log?id=65a51bf3949d7f1f1e653d01 ACN 91 stg1: https://bootmod3.net/log?id=65a62f11949d7f1f1e65b13a |
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01-20-2024, 09:17 PM | #8 |
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Exactly what I plan to get for the final form of this car. Does the flex fuel mean you can literally pump any mixture of E85 and gasoline and the map will figure out the best ? Or standard mixture like E30 or E50 still runs better than others in the middle?
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01-20-2024, 09:49 PM | #9 |
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Precisely. I've ran from e30-70 and tested with both flex fuel and dedicated e maps, I butt dyno no difference. It definitely is convenient. I mainly try and target e40 because I feel that is the optimal power for my current setup. I've specifically asked mhd about the e maps vs flex fuel, they told me there is no difference in performance unless you go custom tune.
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earlgsxbusa130.50 vrships109.00 |
01-20-2024, 09:58 PM | #10 |
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the flex fuel tune will automatically scale the tune to what the E reading is.
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vrships109.00 earlgsxbusa130.50 |
01-22-2024, 06:44 PM | #11 |
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Sorry I’ve been busy the last few days with some developmental stuff we are currently testing. I’ll look at the logs in the morning and let you know what I think.
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01-22-2024, 07:51 PM | #12 | |
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Top off your tank with about 1-3 gallons of ethanol(dependant on what your gas station is pumping out) and you would probably see all that cleaned up much better.
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01-25-2024, 01:55 PM | #13 | |
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Yesterday I just decided to mix with some high octane fuel at a local race fuel stop. I added 2 gallons of 96 ($7.7/gallon) to the remaining tank of ~ 1 gallon ACN 91. This way I suppose the mixture rating is well above 93? Then I flashed the car with Stage 1 93. And hell no, the timing pull is horrible! I got over ~ 4 degrees most of the time. The log does show the torque value is significantly higher than ACN 91 above 5000 rpm, meaning higher peak horsepower. https://www.bootmod3.net/log?id=65b1...d5c02bfd861d1d So is a stage 1 93 map supposed to have so many timing pulls? What should a log look like in other states with quality 93 fuel? But this fuel does clean up all the timing pull using ACN 91 map. Yeah us Californians have to spend ~ $8 on the fuel just to run the most conservative maps. |
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01-25-2024, 02:22 PM | #14 |
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01-25-2024, 02:29 PM | #15 |
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01-25-2024, 05:12 PM | #16 | |
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As long as you're not negative timing during wot, that is good.
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01-25-2024, 06:10 PM | #17 | |
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I was talking about ignition timing corrections. Ideally those should be zero indicating that the engine is happy with the advanced in timing the DME plans. If it detects any knock, or anything makes it uncomfortable to follow the target timing, the DME will correct it, which is always a negative value. Too many corrections means the timing target is not suitable for the fuel or engine condition, it is too aggressive. I still don't know how much correction is acceptable. In some videos I see B58 should be fine if all timings corrections are less than -3. Clearly I got too many -4, -5 with 93 map. But my stock map gives me -6 &-7 for years with regular fuels. So I wondered if I worried too much or what. |
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01-25-2024, 07:03 PM | #18 | |
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I haven't saved any logs lately but I do have one log from last year running strictly shell 93 here on the east coast. My corrections are all 0 with 1 or 2 cylinders at the top of the rev range ~1.5-2 degrees. https://datazap.me/u/greatzong/run1-...46&zoom=26-105
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01-26-2024, 04:48 PM | #19 | |
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But corrections on only 2 cylinders with <3 degrees on a 93 map is beyond what I can dream off. Are you running any different spark plugs than OEM? |
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01-26-2024, 05:15 PM | #20 | |
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https://datazap.me/u/greatzong/run1-...46&zoom=29-105 For spark plugs, I switched to NGK 94201 gapped at .022" The gap is of course controversial but I wanted to experience since my 30k miles factory champion plugs were all over the place in gap ranging between .029-.035" Personally, I don't notice any difference(butt dyno detecs more crispyness?). Overall, I just prefer them to be uniform in gap.
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2019 X3 M40i - MHD STG2 HPFP E40ish | MHD FlexFuel Kit | TU HPFP | xHP stg 3 | VRSF catless downpipe | MST intake | BMS occ | Verus turbo heat shield | P3 V3 gauge w/ P3 ESVA | FTP Charge Pipe | RossRacing PCV v1 VTA | MSS Springs | RES Exhaust w/o valves | Vossen HF-5 21x9.5/10.5 265/295 PS4S | Yellow DRLs | Paragon Rotors w/P3 pads | GTS Tail Lights |
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01-26-2024, 06:19 PM | #21 | |
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And the issue is probably with the spark plugs. I replaced them with NGK 96206 about 6 months ago because these were stated to fit M340i and M440i models past 2020. There is so much confusion whether 94201 or 96206 should be used... but maybe it's that 2mm additional reach that creates more detonation |
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01-26-2024, 06:52 PM | #22 | |
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Assuming you have the gen2 b58, simply looking up the 96206 plugs tells me they are used in s58 and b58. My gen1 only has 94201. Hopefully someone else can chime in on this. Too many sites giving out different information has also brought me into a state of confusion 😅
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