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Technical Topics B48 4-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications [B46] Bootmod3 Stage 1 w/ 93 Octane on G20 First Impressions

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      12-20-2019, 06:57 PM   #45
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So for those looking for technical data on the new B46TU and B48TU engines. According to that .pdf, the engine in G20 is supposedly B46TU, not B48TU, but I thought B46TU was for American models only where the rest of the world has the B48TU? Anyhow, the summary of upgrades and differences between B46/48TU and B46/48 is very descriptively explained in this pdf guide.

https://f30.bimmerpost.com/forums/at...9&d=1553708460
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      12-20-2019, 09:56 PM   #46
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So basically what happened to my car was it threw a hissy fit while being flashed and refused to start once flashing was complete. I used a MacBook Pro with the firewall turned off and antivirus disabled. I downloaded the bootmod3 agent and went through their blog to make sure I was doing everything right.
Got the code, activated it, flashed the car like how they said. And bam. Car throws two errors that refused to go away even when I did online coding. Car was driven just before being flashed and it drove perfectly with zero errors. One error was a car in gear error where it said car cannot be idled when in gear. Weirdly, it showed that the car was in Park on the cluster and gear selector. Another error was a parking brake error saying it was parked on a steep roadway. Again, it was parked on level ground, inside my garage. Accessories turned on but my car refused to crank. I thought I’d give it a few minutes before trying again since I remember something similar happening in my VW long ago when it was flashed. Tried again after a bit but these two errors kept popping up and car refused to crank.
This was when I started becoming tensed. Car was parked in the middle of the garage and I couldn’t park the other cars in the garage because of how I parked this one (to be closer to the wifi router). And it wouldn’t start at all. I flashed back to stock. Same issue. It said flashing was successful but these errors refused to go away. I mailed PTF. Lots of mails were passed back and forth to make sure I did it correctly. They even deleted my OTS map and sent me a new one to try reflashing. Flashed again with it for a third time. No luck. This was when I started to worry properly. I couldn’t keep spending more time since I had to get back and I was away for almost the entire day. I hoped leaving it locked in the garage for a few hours would fix it. Came back after 6 hours and no luck. I scoured through the internet in the meantime and people said that their cars sometimes fixed itself overnight. Mine didn’t even after 6-8 hours. I flashed back to stock again and locked the DME this time (4th flash). Still no luck. I then disconnected the battery in the hopes that that would help. Left it disconnected the entire night. I couldn’t sleep that night and my wife wasn’t happy about it. Plus it was her birthday the next day (today). And I was cranky. That didn’t work. I also messaged g20beam and Mike@xph in the meantime. Thank you very much guys!
Next day, I wake up and go downstairs to reconnect the battery. Reconnected the battery and bam. The errors popped up again. My heart sank some more. It was almost 24hrs now with my car dead. I have lots of family here, visiting for Christmas and new year. And they could see I wasn’t happy. My father-in-law said he was almost sure it wasn’t the flash that caused it and it was probably a fault that popped up, unrelated to the flash. I think it was an unfortunate coincidence too. Just that it had to pop up right when the flash said it was completed. I was in touch with PTF all through. They had a lot of other customers to talk to as well. But I’m satisfied with their response time, all things considered. I messaged Mike again and he said he’d help me. I was contemplating taking my car to BMW and even called a service advisor there and he said he has never heard of this issue and asked me to call RSA and tow the car. I said I’ll bring it in on Monday. Mike and g20beam said it wasn’t a good idea and I listened to them. And finally, PTF said they’ll remote help me if I can get access to a windows laptop. Set one up like they wanted (but I couldn’t disable the firewall for some reason). Halim from PTF helped me out remotely and fixed the car in a jiffy. Honestly, it took more time to download Esys and winrar on that laptop to clear the issue. He asked me to start the car and I did and voila. It started. The parking brake error disappeared. He tried logging in to my bootmod3 but couldn’t because of the firewall. And he had to rush to help another customer.
I drove the car around for a bit. Turned it off and on many times and it works perfectly. Unluckily, it is still flashed with the stock map. I’m too scared to try it once more, lest it happens again and PTF get tired of me Only problem is I know have an “i” on the lower part of the instrument cluster and a notification on my iDrive saying “Check control - Engine start only when idling”. It refuses to go away. It’s visible only when I pull down on the iDrive screen and with the “i” on the cluster.
I’m going to BMW tomorrow anyway to check out an X3 for my wife. So thought I’d pop in and ask the service tech about it.

But yes. PTF was very helpful. So were g20beam and Mike@xph. If I had taken my car in and not listened to them, I’d probably be stuck with a $6000 bill by BMW asking me to replace the DME or something.
At first, I thought I’d return the tune and get a JB+ for the time being and maybe dip my toes in later. But my father in law wants to me to flash my car and see how it is (since he also likes anything that makes a car go faster). So I might try it again on Monday. But honestly, for the timebeing, I’m scared. But let’s see.

Was the error due to the tune? I’m willing to hazard a guess and say no. It was probably just an unfortunate coincidence.
Was I satisfied with how PTF dealt with me? Yes.
Will I buy from Mike@xph again? Undoubtedly.
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      01-04-2020, 07:51 PM   #47
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Originally Posted by bquatt View Post
It will be interesting to see how reliable the B48 is with tuning. Logic would tell you that the B48 can reliably run a stage 1 tune due to the fact it shares internals with the B58 and is essentially just a chopped off block. Also the new JCW Mini Clubman comes from the factory with 310 hp and *i think* it’s pretty much the same engine. I am eagerly awaiting the day I can flash the ECU without warranty implications as I feel like ~300 hp and 370 tq is just the right amount
Hi,

Maybe there will be some value checking the link below for information contained. This has me nervous to increase boost, HP and TQ for the 330i version of the B48. It seems BMW upgraded certain parts like the crank, pistons and bearings when increasing the HP and TQ for the mini etc. It would have been significantly cheaper for BMW to just have remapped the ECU to achieve the higher figures for highest HP and TQ B48 version if they thought it was safe as-is hardware wise. Thoughts?

Click on ‘models’ drop down. https://en.m.wikipedia.org/wiki/BMW_B48
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      01-04-2020, 08:19 PM   #48
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So the 2020 330i comes with the B46TU engine and not the B48 like in the 2019 330i?
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      01-04-2020, 10:18 PM   #49
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Originally Posted by Razor2010 View Post
So the 2020 330i comes with the B46TU engine and not the B48 like in the 2019 330i?
Weirdly enough, my G20 330i has the B46D engine.
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      01-05-2020, 02:10 AM   #50
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Quote:
Originally Posted by Razor2010 View Post
Hi,

Maybe there will be some value checking the link below for information contained. This has me nervous to increase boost, HP and TQ for the 330i version of the B48. It seems BMW upgraded certain parts like the crank, pistons and bearings when increasing the HP and TQ for the mini etc. It would have been significantly cheaper for BMW to just have remapped the ECU to achieve the higher figures for highest HP and TQ B48 version if they thought it was safe as-is hardware wise. Thoughts?
I wouldnt worry as b58 has 11:1 compression, its more about fuel quality when tuning. The 225kw b48 will do 300hp even at low quality fuel. 0
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      01-05-2020, 04:52 AM   #51
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Originally Posted by VipinLJ View Post
Weirdly enough, my G20 330i has the B46D engine.
What year is your car 2019 or 2020?
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      01-05-2020, 04:57 AM   #52
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I wouldnt worry as b58 has 11:1 compression, its more about fuel quality when tuning. The 225kw b48 will do 300hp even at low quality fuel. 0
Only have access to 95 RON which is roughly the USA equivalent of 91 octane / AKI (RON + MON / 2).

Do we know what the stock boost level is for a 2019 and 2020 330i USA spec engine and non-USA spec engine? I wonder if the USA spec runs hotter / leaner because of emissions standard differences. So many questions.
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      01-05-2020, 08:48 AM   #53
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What year is your car 2019 or 2020?
Mine is a 2020 MY manufactured in August 2019. I tried flashing my car twice with BM3 and failed. Gave up and getting a JB+ instead.
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      01-05-2020, 09:07 AM   #54
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What is pretty interesting is that back in the early-mid 1990s, DSM Eagle Talon and Mitsubishi Eclipse boys were running 300+ WHP/TQ with stock internals and limited bolt-ons, mainly just boost increases, fuel pump increases, etc. With 3” exhaust systems, uprated turbos and a few other minor bolt-ons they were running 400+ WHP/TQ on their 1990s technology level 2.0 litre turbos, some over 500. Even with direct injection, VVT / Vanos, etc., how much have we really progressed over the last 2+ decades? Quite a rabbit hole question as emission and mpg regulations haven’t helped. These DSM cars were under 3k lbs. and a little over for the AWD versions. Again, safety regulations along with more driving and entertainment tech hasn’t helped either.

This whole conversation takes me back to my JDM Sti7 days, worrying about fuel octane levels and safety of the engine while contemplating running higher boost than stock.

How much of a hindrance are the current emissions components and MPG saving components costing us power wise with the B48? Another concern is to achieve higher mpg I wonder if these engines are running dangerously lean or if this is not a real issue because at WOT etc. they keep them nice and rich for safety and / cooling properties and the lean situation is only at highway constant speeds that requires minimum boost, etc.

So much to discuss, so many rabbit holes but at the end of the day there is no free lunch to achieve power.

Wonder how our block (aluminum) and internals stack up against those 1990 DSM cars.

Last edited by Razor2010; 01-05-2020 at 09:12 AM..
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      01-05-2020, 09:39 AM   #55
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Originally Posted by VipinLJ View Post
Mine is a 2020 MY manufactured in August 2019. I tried flashing my car twice with BM3 and failed. Gave up and getting a JB+ instead.
Thanks.

Would love to know exactly what engine is coming on my non-USA destined 2020 330i that is currently in production in Germany and what exactly the differences are between all these variations: B48,46,TU,D, etc.
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      01-05-2020, 10:32 AM   #56
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Originally Posted by Razor2010 View Post
Thanks.

Would love to know exactly what engine is coming on my non-USA destined 2020 330i that is currently in production in Germany and what exactly the differences are between all these variations: B48,46,TU,D, etc.
I have the exact same doubt too regarding the differences between these engines. Or is it just a ploy by BMW to confuse us.
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      01-05-2020, 10:36 AM   #57
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I have the exact same doubt too regarding the differences between these engines. Or is it just a ploy by BMW to confuse us.
I could see different emissions requirements across different countries yielding different mapping profiles or adding in an extra CAT etc., but to have enough differences with the actual engine to cause a different engine number seems a bit odd.
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      01-05-2020, 01:32 PM   #58
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Let’s get the discussions going, I know there must be some people on this forum with expert knowledge about tuning turbos, risks, etc. that can offer some knowledge on the B48.

Also, still searching for the stock boost on a 2020 non-USA spec 330i, no luck yet. I would guess with the compression somewhere around 15 psi?
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      01-05-2020, 02:21 PM   #59
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I think we should start a new thread instead of take over g20beam’s thread for that. It will be interesting!
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      01-05-2020, 02:57 PM   #60
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Sounds good, go for it

So many rabbit holes to go down, so many unanswered questions.
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      01-06-2020, 10:21 AM   #61
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Wait, so whats the most effective way to figure out what engine we have??

Cant believe they would put the weaker engine in US cars. Those are the one that will most probably get modded anyway.
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      01-06-2020, 11:13 AM   #62
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Wait, so whats the most effective way to figure out what engine we have??

Cant believe they would put the weaker engine in US cars. Those are the one that will most probably get modded anyway.
I don’t think they are weaker (USA spec 330i and non-USA spec 330i). The HP and TQ are the same, I think they just tweak certain parameters within the mapping to produce whatever emissions and mpg numbers need to be shown. I read something about this online but I can’t find it, if I do will forward link.

What I am concerned with is BMW thought it necessary to upgrade certain components: crank, pistons and bearings (see my post further up) for the B48 when it was put in certain car models for BMW and Mini that sold at 300+ HP stock. BMW could just have easily turned up the boost along with other mapping parameter tweaks to get to this 300+ HP but they spent extra money to install uprated internals obviously because they were worried about engine reliability at this 300+ HP. We all know they would have preferred to save money and just do the map change. So, my question and concern is, just how much further wear and tear are people doing by pushing the standard 330i B motor to 300+ HP, is it a little as would be expected, or is it quite severe, hence why BMW uprated the 300+ HP B4 engines from factory.
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      01-06-2020, 12:53 PM   #63
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Wait, so whats the most effective way to figure out what engine we have??

Cant believe they would put the weaker engine in US cars. Those are the one that will most probably get modded anyway.
I used mdecoder.com to find out which engine my car had. Also checked a couple of other vin decoding websites and they all mentioned B46D in my car.
Power and torque are the same as euro spec cars. I guess different internals?
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      01-07-2020, 01:43 AM   #64
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Quote:
Originally Posted by Razor2010 View Post
I don’t think they are weaker (USA spec 330i and non-USA spec 330i). The HP and TQ are the same, I think they just tweak certain parameters within the mapping to produce whatever emissions and mpg numbers need to be shown. I read something about this online but I can’t find it, if I do will forward link.

What I am concerned with is BMW thought it necessary to upgrade certain components: crank, pistons and bearings (see my post further up) for the B48 when it was put in certain car models for BMW and Mini that sold at 300+ HP stock. BMW could just have easily turned up the boost along with other mapping parameter tweaks to get to this 300+ HP but they spent extra money to install uprated internals obviously because they were worried about engine reliability at this 300+ HP. We all know they would have preferred to save money and just do the map change. So, my question and concern is, just how much further wear and tear are people doing by pushing the standard 330i B motor to 300+ HP, is it a little as would be expected, or is it quite severe, hence why BMW uprated the 300+ HP B4 engines from factory.
No i mean youre right, and thats my concern too. Sure the B46 is a great engine, but a B48 with upgraded internals would definitely make me sleep better at night.
Like you said, if the internals had to be upgraded when pushing 300+ then maybe this needs more research? Maybe there are some weaknesses to the stock B46 parts, maybe just lower quality parts.

IDK, maybe Im just being paranoid.
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      01-07-2020, 01:44 AM   #65
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Quote:
Originally Posted by VipinLJ View Post
I used mdecoder.com to find out which engine my car had. Also checked a couple of other vin decoding websites and they all mentioned B46D in my car.
Power and torque are the same as euro spec cars. I guess different internals?
Yours is 2020?
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      01-07-2020, 03:46 AM   #66
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Yours is 2020?
Yes, scroll up a little, he said model year 2020.

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