[Dreculah]

The B58 in the 3 series makes more power than the one in an M240i.

Is it just tuning, a bigger turbo, both, or ???

[vandridine]

M240 has the B58B30M0

M340 has the B58M30O1

https://www.bmwblog.com/2018/10/31/b...88-horsepower/

[Bavarian MW]

Originally Posted by vandridine

M240 has the B58B30M0

M340 has the B58M30O1

https://www.bmwblog.com/2018/10/31/b...88-horsepower/

VIN decoder shows 2017 M240 as B58M, same as 2018 340? Maybe the 2016 m240 is B58B?

[vandridine]

Originally Posted by Bavarian MW

VIN decoder shows 2017 M240 as B58M, same as 2018 340? Maybe the 2016 m240 is B58B?

https://en.wikipedia.org/wiki/BMW_B58

This wiki page has all the different variations of the b58 and which cars they belong to.

[Bavarian MW]

Originally Posted by vandridine

https://en.wikipedia.org/wiki/BMW_B58

This wiki page has all the different variations of the b58 and which cars they belong to.

Ok, thanks. This is useful information.

I realize now OP is talking about the 2020 M340. I was thinking B58 from 2016-2019 340, same motor as m240...

[cooolone2]

The wiki and other sites really don't break it down... All I've read is the S58 upper end (intake, valves, turbo) is totally different from the B58 as well as the exhaust. Would love a precise breakdown including timing and valve lift details, lol. But even if you could get the parts and do a top/swap, not sure you'd get support, you'd be on your own (tuning, dialing it in).

A better question would be to define the differences between the B58B30M0 (M240i) and the B58B3C (Supra)... BM3 tunes show a significant difference in HP between the two, with same mechanical mods, 40HP difference... Is significant enough that typically cannot be achieved without some physical/mechanical changes. There probably is some "down tuning" going on, in the name of safe tuning, lol. Just a guess until identifying some engine differences. I think the Supra modding groups will bleed information over to the M240 as it is the same engine but a more active group currently.

Regards

[jv92red]

Originally Posted by cooolone2

A better question would be to define the differences between the B58B30M0 (M240i) and the B58B3C (Supra)... BM3 tunes show a significant difference in HP between the two, with same mechanical mods, 40HP difference... Is significant enough that typically cannot be achieved without some physical/mechanical changes. There probably is some "down tuning" going on, in the name of safe tuning, lol. Just a guess until identifying some engine differences. I think the Supra modding groups will bleed information over to the M240 as it is the same engine but a more active group currently.Regards

one major mechanical difference on the Supra B58 is a higher volume fuel pump:

https://f30.bimmerpost.com/forums/sh....php?t=1680853

[Dreculah]

Originally Posted by vandridine

M240 has the B58B30M0

M340 has the B58M30O1

https://www.bmwblog.com/2018/10/31/b...88-horsepower/

Thanks, so the power difference mostly comes from a different turbo and it's on-manifold design.

[cooolone2]

Originally Posted by jv92red

one major mechanical difference on the Supra B58 is a higher volume fuel pump:

https://f30.bimmerpost.com/forums/sh....php?t=1680853

Yes, yes, yes... I've been lurking there, watching, reading, waiting
A fairly easy upgrade to address the fueling limits. Already recognized by BMW in the TU1 (update) and seems to answer the difference between the two I've been looking for. Thank you!

There some other items from the Supra design I'm watching, especially that 1,000hp build.


Anyways, another link (better than just the Wiki which really doesn't spell out the components of the engines or the differences).

https://bimmerlife.com/2018/11/01/b58-engine-technical-update-brings-388-hp/

Enjoy

[bbnks2]

Originally Posted by cooolone2

Yes, yes, yes... I've been lurking there, watching, reading, waiting
A fairly easy upgrade to address the fueling limits. Already recognized by BMW in the TU1 (update) and seems to answer the difference between the two I've been looking for. Thank you!

There some other items from the Supra design I'm watching, especially that 1,000hp build.


Anyways, another link (better than just the Wiki which really doesn't spell out the components of the engines or the differences).

https://bimmerlife.com/2018/11/01/b5...brings-388-hp/

Enjoy

Instead of reading random blogs you could also go on to realoem.com and cross reference part numbers for different makes and models. Blogs often exaggerate things by regurgitating BMW marketing talk.

[cooolone2]

Part numbers don't tell you diddly... What page on real OEM defines the specs for the Turbo, or the Fuel Pump, by part #...?Thank you, but the site doesn't do that. It doesn't provide the specs on a cam, or compression ratio on a piston. Realoem is awesome in its own way, that yes, you can identify parts, even by pictographs, and obtain the corresponding part # and then chase it down.

That page link by the way, describes in detail the difference between the two fuel pumps. And the specs it notates on the HPFP is spot on.

Regards

[bbnks2]

Originally Posted by cooolone2

Part numbers don't tell you diddly... What page on real OEM defines the specs for the Turbo, or the Fuel Pump, by part #...?Thank you, but the site doesn't do that. It doesn't provide the specs on a cam, or compression ratio on a piston. Realoem is awesome in its own way, that yes, you can identify parts, even by pictographs, and obtain the corresponding part # and then chase it down.

That page link by the way, describes in detail the difference between the two fuel pumps. And the specs it notates on the HPFP is spot on.

Regards

We've seen blogs be the source of A LOT of miss-information in previous generations... People still think the 1M N54 uses a dry sump oiling system lol.

That article you linked to was written last year and it proves my point. None of the numbers match the actual latest variants for 2019 and 2020 after the B58 TU (technical update). The B58 TU resulted in the B58B30O1 and the B58B30M1.

The original B58 engine pdf breaks down the naming nomenclature:
https://www.1erforum.de/attachments/...ine-pdf.84135/

B58B30A/B58B30M0 - M240i
B58B30B/B58B30O1 - US Spec Z4 M40i/M340i - 11002464415
B58B30C/B58B30M1 - Supra and many others as of 2019+ - 11002463592

Here is an actual BMW press release for the Z4 M40i which has the B58B30B variant engine for all production months.

https://www.press.bmwgroup.com/globa...the-new-bmw-z4

And the technical specs it links to: https://www.press.bmwgroup.com/globa...84770EN/442425

The largest variation between these two engines is that B58B30C uses an integrated exhaust manifold and cylinder head (dubbed a "headifold"). Details of the B58 TU updated engines can be found here:

https://f30.bimmerpost.com/forums/at...4&d=1565745080

Comparing the BMW academy docs will help pinpoint some of the differences between the B58 variations. Even those docs are full of marketing talk. A lot of the time they re-iterate normal bmw technology as if it's all new and special for the engine being discussed.

Point being... The "leaks" that the blog you linked to did not end up being entirely accurate. Even all the wiki pages have a lot of bad information. Mostly they all reference back to random european auto blogs. Even further complication is that the US and EU are now getting different engines to meet the latest EU emissions. The Supra/EU Z4 B58B30C seems to be more capable in stock form but it's an overall more restrictive package that is oriented around EU emissions. Nothing you can bolt on to a regular M240i and go faster.

There are factual sources available to us.... BMW academy docs, Newtis.info, Realoem, BMW's subscription based online system, Rheingold, etc.... Once you have a part number from Realoem you can use that to get the technical details through various BMW systems. The big differences would be between the A/B/C engines. Each of these engines have sub-categories of trims/power levels but the hardware is the same.

[SMartinR]

thanks for the ifno guys!

My question would be, how to know what version of B58 my m240i 2020 has?
I read the wiki page and it skips from 2017-2019 to 2021 without mentioning the year 2020.

Is there a way to use the VIN code to figure it out?

thanks!!!

[aerobod]

All F22 M240i have the B58B30M0 engine in 250kW/500Nm guise for all model years.

[jordan24c]

Yep, what aero said - the only difference that wouldn't even apply to you is 240s (or I guess all BMWs for that matter) built after 06/2020 have the new DMEs. But I think by then, they'd all be model year '21s