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      01-29-2019, 10:03 AM   #1
silvercas
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B58 Engine Versions?

Hopefully this is the right place to ask

I have a 2019 440 with a B58 engine. Im curious to know what the differences are with the internals of the B58 engine in the 440 vs the one used in the Toyota Supra and the One being used in the BMW Z4?
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      01-29-2019, 10:33 AM   #2
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https://www.roadandtrack.com/new-car...mw-z4-engines/
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      01-29-2019, 06:34 PM   #3
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That article has some good info on the Z4/M340i vs the Supra I haven't seen yet, but there is more than one US version of the B58 between all the 40i models kicking around right?

I have the X3 M40i and have been curious about this myself. I watched this video last week which breaks down the engine number convention in good detail, but it only mentions the Z4, Supra and X5.

The Z4 M40i is rated at 382hp where my M40i is rated at 355hp; the X5 40i has even less output. According to the linked video there are six different performance classes for the B58.

I had been assuming the differences were all in tuning, but after reading about the Supra having hardware differences I'm not so sure all the BMWs run the same hardware in the US. Any more info on the topic would much appreciated
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      01-29-2019, 06:36 PM   #4
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Quote:
Originally Posted by deladude View Post
That article has some good info on the Z4/M340i vs the Supra I haven't seen yet, but there is more than one US version of the B58 between all the 40i models kicking around right?

I have the X3 M40i and have been curious about this myself. I watched this video last week which breaks down the engine number convention in good detail, but it only mentions the Z4, Supra and X5.

The Z4 M40i is rated at 382hp where my M40i is rated at 355hp; the X5 40i has even less output. According to the linked video there are six different performance classes for the B58.

I had been assuming the differences were all in tuning, but after reading about the Supra having hardware differences I'm not so sure all the BMWs run the same hardware in the US. Any more info on the topic would much appreciated
I clicked on the thread to post this video
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      01-29-2019, 07:26 PM   #5
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The variance I'm aware of is different programming between stock and m performance plus exhaust and around 2018 they added a rock guard.
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      01-29-2019, 10:23 PM   #6
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Quote:
Originally Posted by deladude View Post
That article has some good info on the Z4/M340i vs the Supra I haven't seen yet, but there is more than one US version of the B58 between all the 40i models kicking around right?

I have the X3 M40i and have been curious about this myself. I watched this video last week which breaks down the engine number convention in good detail, but it only mentions the Z4, Supra and X5.

The Z4 M40i is rated at 382hp where my M40i is rated at 355hp; the X5 40i has even less output. According to the linked video there are six different performance classes for the B58.

I had been assuming the differences were all in tuning, but after reading about the Supra having hardware differences I'm not so sure all the BMWs run the same hardware in the US. Any more info on the topic would much appreciated
your first paragraph was my reason for posting. I want to know the different version of the B58 used in 2019 and 2020 vehicles.
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      01-29-2019, 10:33 PM   #7
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There have been six variances since MY 2016:

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

No changes in hardware occurred until MY 2019 ("M" to "O" variant.....from Wards Auto):

"But now in the ’19 X5 xDrive40i, the B58 gets a new cooling system, head, timing chain, oil pump and a forged crankshaft. The block and air induction system have been modified, and the new high-pressure direct-injection system now is rated at 350 bar (5,075 psi), up from 250 (3,625 psi)."

First five were all the same hardware, with power differences from tuning.
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      02-01-2019, 08:31 PM   #8
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Quote:
Originally Posted by B58togo View Post
There have been six variances since MY 2016:

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

No changes in hardware occurred until MY 2019 ("M" to "O" variant.....from Wards Auto):

"But now in the 19 X5 xDrive40i, the B58 gets a new cooling system, head, timing chain, oil pump and a forged crankshaft. The block and air induction system have been modified, and the new high-pressure direct-injection system now is rated at 350 bar (5,075 psi), up from 250 (3,625 psi)."

First five were all the same hardware, with power differences from tuning.
So our current B58 does not have a forged crankshaft?
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      02-02-2019, 12:32 AM   #9
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Quote:
Originally Posted by B58 View Post
So our current B58 does not have a forged crankshaft?
It sure does. But T1 uses a new one thats lighter by 2kg.
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      02-02-2019, 12:40 AM   #10
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Quote:
Originally Posted by B58togo View Post
No changes in hardware occurred until MY 2019 ("M" to "O" variant.....from Wards Auto):
Its not M to O but 0 to 1 that brought the hardware change.

M and O are the power class, and translate as middle and upper. The scale from lowest to highest is KUMOTS. The difference is primarily tuning, very little to do with the hardware.

0 was the initial hardware, 1 is T1.
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