09-07-2020, 11:58 PM | #1 |
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B48/B46 Tuning Thread
I've seen a ton of information on N20 tuning, times, dynos and results and wanted to see if anyone has had any luck modifying the B46/B48 engine now that the standard service warranty is beginning to fall off...
I have a stock 2018 430ix 8AT and will be adding FBO and a BM3 stage 1 tune to start. Will be throwing these on in (thanks to Mike at XPH) within the next few months:
Things that I'm thinking of doing / will do later:
Would love to hear folks experience with this engine and open to any suggestions, thoughts and/or tips in tuning. Will keep this threaded updated. Last edited by Avaley; 09-23-2020 at 10:20 AM.. |
09-08-2020, 03:48 AM | #2 | |
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Performance mods so far: 1. Armytrix Catless Downpipe 2. Straight pipe exhaust with valvetronic remote control 3. FTP Charge pipe 4. FTP intake pipe 5. BMS open billet intake 6. BM3 Love the performance it deliver. But after several discussion with PTF, and due to minor accident, i removed the BMS open billet intake and now using stock intake. PTF said, their tune is designed and tested to work with stock intake, and they not recommend us to use any aftermarket intake. After i revert back to stock intake, i do feel that the performance is better and throttle response is much better. But i lost the fun noise of aftermarket intake.
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09-08-2020, 12:08 PM | #3 | |
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09-08-2020, 08:40 PM | #4 | |
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I believe because the OTS map is designed and tested with stock intake, so PTF will not recomended aftermarket intake. My latest dyno recorded 310hp and 445nm, on engine. That still using the BMS open billet intake. Haven't dyno'd again with stock intake. For reference, this is PTF statement
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09-08-2020, 11:33 PM | #5 | |
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I flashed stage 1 today and I am shocked at how much torque it added, everything else stock. My Injen SP open air intake is coming next so we shall see how it feels.... So BM3 doesn’t do anything to the transmission? The 8AT in sport puts down power and almost reads your mind and the engine just goes to redline each gear now. Also the fan always on option is great and my temps are noticeably cooler. Have you tried ethanol mix? With your numbers, I feel like this engine can do 330hp 350ft lbs (475NM) trq at the crank with E30 stage 2 fbo. Bmws 4 bangers have always been underrated and could prob get to low 5s 0-60 and maybe break w FBO stage 2. I should get performance tires (19s?) and hopefully we b48 owners can push it to see gains over N series, an already great engine. Last edited by Avaley; 09-08-2020 at 11:58 PM.. |
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09-09-2020, 06:09 AM | #6 | |
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No transmission tune for B48 engine. We need to get it from XHP. Some folk says, the MAX cooling mode will wear your cooling system faster. I always set that option to off. Nope, there's no ethanol in my country. Several folks here on B48 engine already run 0-60 in 4.8s. I believe they already post their dragy results. I would recommend you get a better tyre. I went with Toyo Proxes T1R which is good, but now i'm using Yokohama Advan Sport V105 which is great.
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Avaley734.50 |
09-11-2020, 02:35 AM | #7 | |
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And N20 isnt great engine at all. It has a lot of weak points and problems, and i dont think N20 has ever shown such numbers with stock turbo as B48. Forgot to say that i have 2018 320ix and MGflasher tune.
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09-11-2020, 03:13 AM | #8 | |
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that's quite impressive number you got
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09-11-2020, 04:47 AM | #9 |
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09-11-2020, 10:33 AM | #10 | |
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It seems that MGflasher might perform better than BM3 Stage2 though it is younger in adoption based on your post history....I may have to switch over or get a Cary Jordan custom BM3 tune after DP/straight pipe/stage 2. I think the newer 8AT is the ZF 8HP50 which should be able to handle 500NM so the trans probably outlives the engine under boost. How is the daily usability (both Luverse on your BM3st2 and Drona on your MGst2)? I find BM3 stage 1 in comfort to be unnoticeable to stock in traffic but day and night different under WOT in sport+ S gear. I'm a bit worried about pushing the engine too much as I've heard N20 was unreliable when pushed hard tho 19 PSI seems within reason...still early in B48 tuning life but promising if it stays reliable |
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09-11-2020, 10:14 PM | #11 | |
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when doing a morning run with the crew, i'm using stage 2, and often go WOT, no problem so far. able to pull this far on stage 2 OTS BM3
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09-11-2020, 10:48 PM | #12 |
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N20 is still proven to be faster than B48.
Proof is in the pudding. Quarter Mile, world wide rankings can be found here: https://www.facebook.com/groups/2443...651/?ref=share |
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09-11-2020, 10:49 PM | #13 |
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Also...
N20 is a back to back winner of Ward's 10 Best Engines. B48 is a zero time winner. |
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09-12-2020, 01:53 AM | #14 | |
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09-12-2020, 04:26 AM | #15 |
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09-12-2020, 04:40 AM | #16 | |
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P.S. I had both n20 and b48, actually two b48s so I now what I’m talking about. |
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09-12-2020, 11:42 AM | #17 | |
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8hp50 holds much more than 500nm, 340 has the same trans and with simple tune it has 600+ nm and no problems. I did 700+ hard launches (3000-4000 rpms) and everything is fine. Daily usability is great! Comfort or aggressive when you need it. Last edited by Dronamashina; 09-12-2020 at 11:48 AM.. |
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09-12-2020, 02:55 PM | #18 | ||
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https://en.wikipedia.org/wiki/Ward%27s_10_Best_Engines I'm trying to avoid a N20 vs B48 flame thread and focusing on B48 tuning specifically. Quote:
In the 2021 G series this year, they up tuned the B48/B58 again and shaved another 0.2s off 0-60 and BMW is now claiming 255hp/400nm (5.3) in the B48 and 382hp/500nm (4.3) in the B58 from the factory so there is definitely so more potential to be had. Any thoughts on changing your factory heat exchanger? Since going air-to-water and away from an intercooler, i dont think there are a ton of heat issues but CSF makes a upgraded radiator tested to keep temps cooler but the factory one has done great for me, esp with the max cool setting in BM3. https://csfrace.com/bmw-b58-cooling/ Last edited by Avaley; 09-12-2020 at 03:12 PM.. |
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09-12-2020, 04:21 PM | #19 | |
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I think 12.4 is very close to max performance with stock turbo. Maybe 12.3 but that would be very hard to do without cheats)) Don’t think couple of degrees decrease in iat is worth the price of a tuned heat exchanger. |
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09-13-2020, 10:43 PM | #20 | |
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the car feel more responsive than using open billet intake
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09-14-2020, 09:55 PM | #21 | |
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09-15-2020, 11:26 AM | #22 |
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damn those are some good times, best I got was 12.65 at 110.4mph, out here in southern china my DA is 2200ft, and with a 2.03 60ft that is about best case with RWD
running 26 psi, with my own tune, which I think is the most I am comfortable to run without building the engine for the run above I turned off the meth, to monitor my turbo efficiency, got 350 deg F out with about 90 deg ambient air, at 26psi that works out to 66%, so still very reasonable, with 90% WGDC, I only have a modified compressor wheel, so i guess your efficiency is lower, but the DA would likely more then make up for that, and the that the inter cooler is really good on a 0 to 120 run, with meth turned off my IAT only increases by about 8 to 10 degrees, for example on the run about it started at 120 deg and ended at 128 deg F meth is odd, as it does not appear to gain any power, or gain much in IAT, maybe 4 to 5 deg based on my logs, the inter-cooler looks very good, I can see a little better timing with meth, and i run about e90 in the meth tank, if you can get good fuel like e30 that i am running, i dont think meth will do anything for you, do not bother if you do not have it already |
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330i, 430i, b46, b48, bootmod3, f30, modification, stage 2, tuning |
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