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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > B48B20A (20i Variant only) Tuning Discussion
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      06-16-2021, 06:31 AM   #67
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I was forced to do an interesting test recently, police got a report of my plate and that my exhaust was modified, and they tracked my car to my work parking lot for inspection

luckily they had no idea how to give me a fine, and impound my car for a week like they were supposed to do, apparently their system can only use local ID numbers, they have no idea what to do with a passport number

but I did promise them I would put back the stock exhaust, and I did

what surprised me is I didnt see any difference in my tune, the WG profile and boost was exactly the same with the stock setup, that was full DP and custom exhaust and just basically strait pipe 3' all the way, and I didnt see any different in my draggy times either

I also put back the stock air filter, for a month in case they checked me again, recently I put back on the ARMA air filter, and I was immediately over boosting, and I needed to retune with lower WGDC to get the tune back to normal, so the turbo was making noticeably more boost then before with the ARMA air filter, after tuned for the same boost power was the same but still interesting, as I was under the impression these were more for the sound and not performance

totally the opposite of what I expected
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      06-26-2021, 12:55 AM   #68
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An update from the German 120i on Facebook that had piston damage -
"Hello everyone again. I don't have the car for nearly 2 months now, but I thought it may be helpful for some people to report back what the actual cause was. As my tuner was very curious and wanted to know what could possibly be the reason for fail, they checked everything. As BMW warranty didn't pay for it, I could keep the old engine anyways so I had no problem with giving it to them till they maybe find something.
To sum up: One injector was faulty and that's what broke the cylinder. The injectors were checked and the one from the broken cylinder was totally stuck upon, so it kind of "flooded" and hydro-locked the cylinder, that's how they described it. So basically the pressure was so high in the cylinder and the amount of fuel that big, that it kind of acted like a water-damage. I also have the analyses from the injectors and the other 3 were fine. Sadly, it was not case were the injector just started leaking some time ago, but the solenoid itself broke so it was a "sudden" defect somehow.
Small part, big damage.
Keep enjoying your cars!"

It seems that his tune was safe after all and the injector was the cause of damage. Now, since this was a case of sudden damage, what should be a good prevention method? Along with spark plugs and ignition coils, are fuel injectors also something that should be changed after a certain mileage?
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      06-26-2021, 03:18 AM   #69
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Quote:
Originally Posted by tpoddar View Post
An update from the German 120i on Facebook that had piston damage -
"Hello everyone again. I don't have the car for nearly 2 months now, but I thought it may be helpful for some people to report back what the actual cause was. As my tuner was very curious and wanted to know what could possibly be the reason for fail, they checked everything. As BMW warranty didn't pay for it, I could keep the old engine anyways so I had no problem with giving it to them till they maybe find something.
To sum up: One injector was faulty and that's what broke the cylinder. The injectors were checked and the one from the broken cylinder was totally stuck upon, so it kind of "flooded" and hydro-locked the cylinder, that's how they described it. So basically the pressure was so high in the cylinder and the amount of fuel that big, that it kind of acted like a water-damage. I also have the analyses from the injectors and the other 3 were fine. Sadly, it was not case were the injector just started leaking some time ago, but the solenoid itself broke so it was a "sudden" defect somehow.
Small part, big damage.
Keep enjoying your cars!"

It seems that his tune was safe after all and the injector was the cause of damage. Now, since this was a case of sudden damage, what should be a good prevention method? Along with spark plugs and ignition coils, are fuel injectors also something that should be changed after a certain mileage?
This is excellent news, I heard of other b48s with injectors failing. Initially when my friend's b48 failed, I taught it was a faulty injector. However this was not the case.

See 7:20 of video for a way to test injectors

If injectors are known problem it maybe best to test them or replace at a certain mileage.

Curious if this user was on the database, could you send me his details of have him message me it so I can update it accordingly.

Thank you and great information.
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      06-29-2021, 11:54 PM   #70
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Quote:
Originally Posted by Freddie_Rome View Post
Finally Mg Flasher support gave me another custom map, based on the previous calibration, but this new one is less conservative and increases a bit the performance. I'll do some new datalogs soon!
Do you have some new logs to share? I am thinking of switching from bm3 to MgFlasher for the added power.
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      06-30-2021, 09:44 AM   #71
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Quote:
Originally Posted by tpoddar View Post
Do you have some new logs to share? I am thinking of switching from bm3 to MgFlasher for the added power.
Not yet, sorry. Now in my country is very hot (30-35c°) and the only thing you wanna do is going to the beach... LOL

Last edited by Freddie_Rome; 06-30-2021 at 09:51 AM..
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      07-05-2021, 09:11 PM   #72
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If anyone here is wondering why MgFlasher OTS maps are more aggressive than bootmod3, it may be because MgFlasher alters the stock knock tables in their stage 1 and stage 2 tunes.
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      07-07-2021, 11:33 PM   #73
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Yet Another damaged piston. Link to story here - https://www.facebook.com/groups/b48e...3048905888885/

Owner blames the dodgy custom tune but there's no evidence.
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      07-12-2021, 06:15 AM   #74
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Hello

If you select the 95 Ron map and running with 98 Ron is the best solution to avoid à piston failure?
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      07-12-2021, 07:13 AM   #75
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Quote:
Originally Posted by Makito View Post
Hello

If you select the 95 Ron map and running with 98 Ron is the best solution to avoid à piston failure?
Yes, running higher octane than what the map requires is always safer for the engine. Just collect datalogs to make sure the map is running right.
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      07-12-2021, 01:02 PM   #76
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Ok thanks
E10 (10% éthanol + 95 Ron ) is better than 95 Ron ?
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      07-12-2021, 11:38 PM   #77
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Quote:
Originally Posted by Makito View Post
Hello

If you select the 95 Ron map and running with 98 Ron is the best solution to avoid à piston failure?
i've been running this setup for 10k miles at Stage 2, no issue so far
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      07-13-2021, 10:33 AM   #78
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I wanted to report a pair of cases from italian bmw forum: two cars with b48 engine (230i and 120i) broke this part:
Hose cylinder head expansion tank (17129845173)
It causes fast coolant loss and it's necessary to stop the vehicle.
Attached Images
 
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      07-14-2021, 12:53 AM   #79
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Quote:
Originally Posted by Freddie_Rome View Post
I wanted to report a pair of cases from italian bmw forum: two cars with b48 engine (230i and 120i) broke this part:
Hose cylinder head expansion tank (17129845173)
It causes fast coolant loss and it's necessary to stop the vehicle.
but this should not related to tuning this engine right?
i think it related more to the age of the part, which become weaker overtime
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      07-14-2021, 01:28 PM   #80
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Quote:
Originally Posted by Luverse View Post
but this should not related to tuning this engine right?
i think it related more to the age of the part, which become weaker overtime
maybe yes, maybe not
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      07-16-2021, 11:43 AM   #81
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I am also worried about the piston problem. I have brushed the BM3 91oct program in the last 60,000 kilometers from the 220I in 18 years, and replaced it with new spark plugs and oil. I'm in southern China, it's very hot here, and I use China 98 gasoline (maybe not very good). This is my log of 4 files, but I also tried log of 4 files and 3 files. There will be no knocks on the first run each time, and sometimes there will be knocks on the second run. I am worried that it will damage the piston... but my program agent told me that this is okay. It may be due to the hot air intake temperature. I also tried daily logging of the resistance position and no knock was found. Until today, I tried to pull the 4th log on a rainy day. The intake air temperature was greatly reduced, and the ignition was much better than before.
LOG GEAR 1-4:https://www.bootmod3.net/log?id=60ed...729b1b9ded9fe2
LOG GEAR 4 RAIN:https://www.bootmod3.net/log?id=60f1...90c6286f46af46
LOG GEAR3 HOT:https://www.bootmod3.net/log?id=60e7...729b3e37a59bf9

I don’t know if it was related to the log I used the 3rd gear or the intake air temperature. The 4th gear log ignition before and after a rainy day does not seem to be a big problem. Just worried that afr will affect the piston
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      07-17-2021, 06:09 AM   #82
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Finally,
here's 4 datalogs with the 2nd custom map Stage 2 ACN91 provided by mgflasher support:

https://logs.mgflasher.com/log/3d0aa...a-4cf1070aea5d

No knocks, timing seems acceptable and also power/torque output is a good compromise.
My concern is the AFR, at high rpm becomes leaner.

Last edited by Freddie_Rome; 07-17-2021 at 06:15 AM..
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      07-19-2021, 03:28 AM   #83
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Quote:
Originally Posted by mingjs584520 View Post
I am also worried about the piston problem. I have brushed the BM3 91oct program in the last 60,000 kilometers from the 220I in 18 years, and replaced it with new spark plugs and oil. I'm in southern China, it's very hot here, and I use China 98 gasoline (maybe not very good). This is my log of 4 files, but I also tried log of 4 files and 3 files. There will be no knocks on the first run each time, and sometimes there will be knocks on the second run. I am worried that it will damage the piston... but my program agent told me that this is okay. It may be due to the hot air intake temperature. I also tried daily logging of the resistance position and no knock was found. Until today, I tried to pull the 4th log on a rainy day. The intake air temperature was greatly reduced, and the ignition was much better than before.
LOG GEAR 1-4:https://www.bootmod3.net/log?id=60ed...729b1b9ded9fe2
LOG GEAR 4 RAIN:https://www.bootmod3.net/log?id=60f1...90c6286f46af46
LOG GEAR3 HOT:https://www.bootmod3.net/log?id=60e7...729b3e37a59bf9

I don’t know if it was related to the log I used the 3rd gear or the intake air temperature. The 4th gear log ignition before and after a rainy day does not seem to be a big problem. Just worried that afr will affect the piston
我用着CHN91的map,加95号油,日常用很多爆震,换了arqray尾段,你这个log好多了,看来 还是得加98,你用的是OCT吗?
im using CHN91 OTS map and run with 95RON(i guess 90aki), detected alot of knock in my daily use log,i also use ARQRAY catback(76mm) to exchange my OEM catback,your log seems much better than mine, RU using OCT91?
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      07-19-2021, 12:02 PM   #84
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Quote:
Originally Posted by ZsAdv View Post
我用着CHN91的map,加95号油,日常用很多爆震,换了arqray尾段,你这个log好多了,看来 还是得加98,你用的是OCT吗?
im using CHN91 OTS map and run with 95RON(i guess 90aki), detected alot of knock in my daily use log,i also use ARQRAY catback(76mm) to exchange my OEM catback,your log seems much better than mine, RU using OCT91?
是的,我用的是91oct 中国石化的98ron。我是其他原厂,排气中尾用的M2 的
Yes, I use 91oct map, running 98ron of Sinopec. I’m from another original manufacturer, the M2 used in the middle section of the exhaust
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      07-19-2021, 12:23 PM   #85
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Quote:
Originally Posted by ZsAdv View Post
我用着CHN91的map,加95号油,日常用很多爆震,换了arqray尾段,你这个log好多了,看来 还是得加98,你用的是OCT吗?
im using CHN91 OTS map and run with 95RON(i guess 90aki), detected alot of knock in my daily use log,i also use ARQRAY catback(76mm) to exchange my OEM catback,your log seems much better than mine, RU using OCT91?
我想问问你的91CHN,LOG显示多少扭矩?之前我想尝试,但是我的销售商告诉我这没必要哈哈哈,听到你 消息我觉得还是运行91OCT,然后用98ron运行吧。
I want to ask how much torque does your 91CHN and LOG show? I wanted to try it before, but my seller told me that it’s not necessary hahaha. After hearing your news, I think I’d better run 91OCT and then run it with 98ron.
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      07-19-2021, 11:38 PM   #86
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your log looks like it does have more timing corrections then I would expect at that timing and AFR, 98 RON out here is not great, I normally try to buy from SHELL station and pay a little more for it then form sino or other

I mix with e98 as well, it is a hassle to do that every fill up, at least it is cheap our here, you can buy 5L jug on Taobao for 35 RMB (5 USD) with free delivery to your door, add one 5L jug to one tank of gas and you should see those knock corrections go away with an ~e10 mix, or you can at least check if that is your issue by try that, you will get some weird look at the staff at the gas station but I get that anyway as a foreigner no matter what I do

I use 3 jugs per fill up (15L) or about e30 mix, but I also run 27 psi and 16 deg of timing, your running like 9 deg timing and like 17psi, so e10 is all you need to clean it up
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      07-20-2021, 12:19 AM   #87
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FYI here log of my tune running e30

https://www.bootmod3.net/log?id=60d8...729b3fd8cf0f0a

per the stock TQ to Load tables provided your tuner has not messed with them, I have not, we can compare TQ and boost below of your BM3 OTS 91 vs my hybrid turbo custom e30, for general interest,

FYI both IAT were close to 51 deg in the OTS log and 49 deg in my log

380nm @ 4000rpm @ 1.25 bar @ 5.5 deg
466nm @ 4000rpm @ 1.55 bar @ 7.5 deg

375nm @ 5000rpm @ 1.4 bar @ 6 deg
485nm @ 5000rpm @ 1.7 bar @ 12 deg

300nm @ 6000rpm @ 1.3 bar @ 7 deg
475nm @ 6000rpm @ 1.9 bar @ 13.5 deg

275nm @ 6500rpm @ 1.25 bar @ 7 deg
450nm @ 6500rpm @ 2.0 bar @ 14.5deg
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      07-20-2021, 11:15 AM   #88
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Quote:
Originally Posted by RMMAGA View Post
your log looks like it does have more timing corrections then I would expect at that timing and AFR, 98 RON out here is not great, I normally try to buy from SHELL station and pay a little more for it then form sino or other

I mix with e98 as well, it is a hassle to do that every fill up, at least it is cheap our here, you can buy 5L jug on Taobao for 35 RMB (5 USD) with free delivery to your door, add one 5L jug to one tank of gas and you should see those knock corrections go away with an ~e10 mix, or you can at least check if that is your issue by try that, you will get some weird look at the staff at the gas station but I get that anyway as a foreigner no matter what I do

I use 3 jugs per fill up (15L) or about e30 mix, but I also run 27 psi and 16 deg of timing, your running like 9 deg timing and like 17psi, so e10 is all you need to clean it up
Thank you for your reply and reminder. I also want to try whether e98 will improve everything. 91oct is often corrected during operation, probably because of the poor quality of Chinese oil. I am trying to solve it. It will be perfect when the intake air temperature is relatively low, but there are many corrections for high intake air temperature. Seeing that your E30 can still be so perfect at an intake temperature of 50 degrees, I can’t wait to try it, thank you very much for your suggestions
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