2 Port B58 Engine Swap Into G20 330i 

2025 M340I B58 Gen 3 is now a 2 port? I thought they retained 6 ports as like in the previous gens

I don’t remember where you’re located, Texas if I remember right? Anyways unpopular FACT for viewers that don’t know; you don’t need lower compression to run a ton of boost in this day and age. Yes in the old days lower compression was needed…because high octane fuel was next to impossible to obtain, efi tuning and knock sensors were light years behind current tech. Not an issue anymore. Run a stronger E-mix/colder plugs and throw some timing at it. Low compression engines generally run more boost for any given power level. Ex 10psi - 300hp High compression engines use less boost for the same power level. Ex- 6-7psi -300hp Again higher & more readily available octane fuel and advances in tuning/tech are what allow us to take advantage of “high compression” Compression is good 👍

Bro is basically building a engine that everyone dreams about. Respect!!

@@AgentExhale I think everyone thought that the M performance models would get a 6 port head again but it never ended up happening. The 2025 M340i just started showing up at dealers and it has the same 2 port as the X7, X5 and 7 series. It has the B58B30M2 so it's basically similar to what I'm ending up doing here, 11:1 compression and a 2 port head. The 2025 even has less power at 375. I'm sure they made up for the difference with the hybrid system and it will probably outperform the stock Gen 2 cars. When they brought out the 6 port M340i I think it was like a last hurrah for the non M cars. A proper 2JZ replacement, I see all the signs that the M340i/2021 Supra will be a future collectable car. I traded in my 2020 years ago and got 44K for it, a good one wouldn't be that far off 40 to 45K now. Can't recall another car holding that kind of resale value. These 2 port Gen 2 B58s will be a dime a dozen soon once more SUVs get written off. If the M340i keeps holding value and the 330i keeps dropping like a rock this swap will make way more sense. To me it already makes a lot of sense but only because I am selling my entire setup for good money and I'm making content.

@@allcarthings7678 Yes everything you said and another major factor that makes this viable in my opinion is the 5000 psi fuel system on the Gen 2 motors to mitigate low speed preignition which can plague direct injection cars. I think if the 2020 Supra didn't have the head restriction people wouldn't break pistons at 800 WHP, the back pressure leads to excessive heat. A head swap while retaining the 11:1 compression could be interesting...

Can confirm... 😂😂

Yup very underrated for sure

Couldn’t agree more🤌🏽

Thank you for the kind words Thanks for watching as well!

I think it’s the lack of fear in tackling almost anything that impresses me most! I feel trepidation just changing the oil in my 2014 50i, much less anything else more involved! Wish I had even a 1/4 of this guys confidence.

Thank you very much! Yeah in some ways I’m sad to see it go but also know 100% that I’m not done with that platform. In a perfect world I’d get something like a Supra with the B46D to see what 700 crank HP looks like.

@@VehicularDIY why the b46D ? the b46 is more restrained due to emission regulations than the b48. On the other hand, isnt the D the later production one (gen3)? the one with the exhaust headers integrated into two 3 to 1 ports. I saw some videos how the 3rd gen b58 has been having some reliability issues with the variable camschaft guides. Pd: i love ur vids. thanks for everything.

The B46D is the exact engine in my car an is a Gen 2 engine. The Supra is running the exact same engine.

@@VehicularDIY so no b48 is being sold in the usa (Im from ARG) cause of emissions? I still cant understand why its the "D" version on your 330i. 2020/2021 g20 330i Should pack the O1 version of the b48 which is the high performance, therefore it cant be b46. b46 are the b48 engines mounted on the 320i, engine code ends in M1 for at least the 2020/2021 g20 models.

@@VehicularDIY could you run your b48 setup in a g30 530i?

Yeah I just changed the radiator in my E88, what a contrast.

Yeah all things considered this is a very easy swap besides the DME stuff but now that I figured that out it is also straightforward in hindsight.

In the US the 320i comes with these coolers from the factory. I would double check to see if they are included on a Turkish car. By the way my mother is Turkish and I've spent many months in Ayvalik, Cunda adasi specifically. Beautiful place.

I think the 30i engine might end up being the spiritual successor to the SR20 like the B58 is to the 2JZ. Once more people get wind of how much potential it has, hopefully the E30 nearly running a 9 second 1/4 mile will help showcase that.

I don't have that yet but have been thinking of setting something like that up.

I came across so many S58s for under $10K and believe it not it wouldn't have been much more work than what I did here and it would have bolted to the same transmission. Overall cost would have been not too far off of a 6 port B58 swap but the 2 port worked out to be a much better deal and goes more along with what I'm trying to accomplish which is a really powerful daily driver with lots of response. The S58 in the G80 wasn't too eager at low RPMS and would constantly be dropping a gear to feel quick in comfort mode.

@@VehicularDIY you can use my car for the content lol I’ll pay for the motor lol not sure what else is needed :)

@@VehicularDIY would you ever do a video and making the internals of the B58 stronger?

Thank you! I know my audience likes me to keep in all the nuance details and I am glad to hear you're enjoying it!

i would say they are both on the same level but Sreten from m539 is more on the classic's bmw side.

Thanks for watching! On a B46D with the IM450 I was able to make around 480 WHP with full E85. It's more realistic to say 460 to 480 WHP and low 500 for WTQ. I left it on a tune that would make over 500 WTQ and beat on it like that for nearly a year. The IM450 would heat soak the stock intake manifold and stock heat exchanger after about 3 back to back pulls. That is because it was out of its efficiency range. To combat that I installed an upgraded intake manifold and heat exchanger and after doing that I could do back to back pull continuously without any fade in power. I opted to do that rather than go with the IM500 larger turbo as that would spool later. So if you don't want to upgrade the intake manifold and heat exchanger you would aim for more like 420 to 450 WHP and I could imagine that being possible on an E40 or E50 mix with could potentially negate the need for port injection.

@@VehicularDIY For some reason I can't respond to your comment. Wow, thank you very much for answering. Is there any way to contact you? I have some doubts but I already made the purchase hahaha. Can I contact you somehow? Thank you very much for your content and your response.

Nice if I get stuck I'll reach out haha.

Were you able to unlock the DME by swapping the chip?

Speaking of Legos, you can thank BMW for using Lean Six Sigma methodology to make this possible. We plan on doing a podcast talking about all this in more detial.

Thanks! Can't complain, it's nice to have a bunch of videos already planned out.

Nice! I was thinking of doing a wagon swap to make a sick daily. Best of luck as well!

n52 better

Thanks, yes a downpipe and a remap would get you to around 300 HP at the wheels. I think piggybacks are safe and you could get to maybe 280 crank HP if I had to guess.

Thanks, sure here is an affiliate link to them: amzn.to/4dMrUJB

You'd basically have to google it and you'll find various forums talking about how it gets setup.

Yeah people are starting to swap B58s into older cars, a Gen 1 is definitely more straightforward but no reason why you couldn't get a BDC module/keys and cluster from a G series car and slap one into an E series car as well. If you did the rack and cameras on the dash could even have assisted riving if you wanted to go nuts.

Yeah I'll still feature the B46 being pushed in the E30, the owner is just down the road and I would like to get a 330e with the exact B46D that is in my car to revisit building the ultimate daily.

Thanks for the comment. With the pre June 2020 DMEs they do have virtual OTP memory that the bench tools get around hence I was able to fully write over the erom and irom sections of the chip on my donor DME. The post June 2020 DMEs have bench protection and what appears to be true OTP memory. Femto is the only company that sorted out the bench protection and offer partial unlocks likely due to the OTP sections of the flash being true OTP. They can however fully read off both sections of the chip and send you the bin files which you can then have cloned to a pre June 2020 DME allowing full functionality as the DMEs are identical otherwise. With the way I left things in this video I knew that the car would likely start but wasn't sure if the irom section of the DME might contain vin information from the donor car and would exhibit odd behavior like reporting the wrong vin via a generic OBD scan tool etc. If that ended up being the case I could have just flashed the DME via esys and told it the car is an M340i. All I did in this video was default encode the DME with my VIN and modified vehicle order which I just assumed only wrote to the erom section but for all I know it might have wrote to both sections, I I could verify that via pulling the bin files back off the DME and doing a difference comparison to see the irom is changed also. I think I will do that and respond to this comment. Assuming it only wrote to the erom section I and the car starts but limits access via OBD and has odd codes I could then just fully flash the DME via esys with my modified vehicle order and that would sort that part out. I would then need a modified tune catered to the 2 port engine so basically an off the shelf tune for a 2020 Supra. I could take it further by modifying my vehicle order to be a X5 as the G05 is basically electronically identical, I would verify that by calculating the FP to see if the configuration is plausible. I could then use esys to flash the DME alone which would ensure that both the erom and irom sections of the chip have all my vehicle information including the ISN but would retain the appropriate tune. But it would probably be easier to just flash as an M340i and go the custom tune route. For me my main goal was to have no EWS codes and I could communicate with the DME even before I default encoded it so that was a good sign right out the gate. Lets say we even took this further and none of this works, I was able to even force flash the irom from my 4 cylinder, I even tried it again with no checksum checks and both times it took the information. In that state the DME wouldn't communicate in ISTA. If somehow the VIN information must be on the irom section of the flash before it would carry that information over to the new flash then I could use esys to recover the DME from that state but that goes against the way I understand how it functions, if the DME has virtual OTP and it were to be corrupted that would lock you out from being able to recover it but various flashing platforms have no issue recovering a corrupted flash as long as they can get the vitals from other modules like a BDC or CAS. This was a long reply but just outlining my thought process and I can come back to it if needed for further troubleshooting.

Yeah the funny thing is this G20 has every feature ever offered so finding an M340i loaded the same way is possible but it goes for mid 40s all day long. This is a lot of work but good for context and will be cheaper overall and I'll maintain all the features.

This is just understanding at my own level and a ton of research, now days I've been bouncing ideas off of Chatgpt and then I get lightbulb moments based on the responses I get. So I guess you could say a little bit of AI as well lol.

Yeah I had vendors saying they'd send me a full turbo kit to feature on the channel but when it was time for the pavement to hit the road they went quiet. I have the manual e88 and could easily do it just can't justify the hardware cost in terms of the views it would get.

Yeah like I said in another video if I knew that the 330e also came with the exact engine that my 330i has I would have looked for one instead. Didn't know they started putting the 330i engine in at one point instead of the 320i. I'd like to revisit building one, maybe for a viewer. Might put it out there. Could have 600 crank HP and pull like a V8 down low with the electric torque fill. Could be the ultimate daily better than what I'm trying to build here.

I updated it to make it more clear, sadly super straightforward titles don't perform like they should. Always has to be some type of headline to get decent views.

Yes I have a downpipe. It would have been a big bottleneck with the upgraded turbo, I’d recommend you install it at the same time as the turbo if you’re looking to replicate my build.

@@VehicularDIY thank you!

@@VehicularDIY Hi again, would you recommend adding a stage 2 high pressure fuel pump? Or would that be too much for the car to handle?

Depending on the mileage I'd be looking at fuel pressure to start.

Yes it does, depending on what year your car is you would need Gen 1 or Gen 2.

If you have a December 2020 330i there is still a chance that you have a pre June 2020 DME. The only way to be sure is to pull the DME and read the date code off it.

@@VehicularDIY I checked my car and it is September of 2020. I am stuck?? I don't want to do a FEMTO unlock since I'm weary of sending my DME to Finland but more-so that it can be locked again with OTA updates. My car is a CPO with 20k miles and has a year and a half of warranty left. Want to do a downpipe at least but dont want a CEL and possibly stage 1 preferably flash tune and not piggy-back to wake it up a little bit . Stock torque curve is very strongly mid range and doesn't pull to red-line like a B58 does.

It’s on Aliexpress both for F series and G series.

@@VehicularDIY what seller if u don’t mind me asking? There about 100😂thanks again

Maybe pickup a clapped one for 17K and slap this in for 7K and go for 800 WHP lol. I'll summarize how cheaply this could be done at the end of the series.

@@VehicularDIY im trying to move out of mainland US so im not buying anything over 3k as long as im here 😭

Yeah spoiler alert this E30 is getting a full metal E30 M3 conversion. Will have nearly 500 WHP and look like an E30 M3 with a crazy power to rate ratio. I'd take the B48 in an E30 over a B58 any day. I had two E30 M3s and the balance of that car with the S14 engine is untouched, the S14 has an iron block so imagine an even lighter engine tucked right back by the firewall for mid engine like handling.

​@VehicularDIY that's awesome, thanks for a sneak peek into the build, and I agree it will be more than enough power for the chassis 🙌