[OG///M]

Originally Posted by lixiang7349

Both came out my2016. This decision still baffles me. B58 with dct would have been a sick car.

Have to realize, even if they seemed to be available to the public one after the other around the same time, the planning was done years ago.

The N55 in the OG was the best choice for them before the B58 was ready.
Of course, it was also influenced by the fact the spiritual predecessor 1M had a similar M-fied N54. The M2 was all about continuing that philosophy/tradition and it did it well.

Remember, the 1M and OGM2 was always a parts bin car, a car where the M division came up cause they wanted to have some fun, see what would happen if they bolted a wide track to a small car and didn't cared that much about numbers.

In a way it was never a sensible decision. If anything it was supposed to be a bit ridiculous.

[OG///M]

Originally Posted by Moflow

If I’m being honest, this is one of my favorite things about the M2 Competition. It’s not every day that emission regulations force a company to add 40 horsepower and another 600 rpms to a cars redline. Generally, it’s the opposite.

Every good hero (car) needs a good origin story and the M2 comp definitely has one. Even if it will always sound worse than the OG....

True, this is what I've always liked about the M2 origin and lineage. It started with paying homage to the E46 M3, the 1M. It's a fun car that was not serious at all. It was always "what can we do make this a reality and keep it alive? We know the profit margin is not great as the other cars we sell and we barely have any options to make money off of it, but damn it let's keep doing it cause this short wheelbase, chassis with good power is awesome!"

Even though I still don't like the connected grille, I'm glad the M2C was a continuation of the OGM2 and was able to escape before the current status at BMW settled in.

[Moflow]

Originally Posted by OG///M

True, this is what I've always liked about the M2 origin and lineage. It started with paying homage to the E46 M3, the 1M. It's a fun car that was not serious at all. It was always "what can we do make this a reality and keep it alive? We know the profit margin is not great as the other cars we sell and we barely have any options to make money off of it, but damn it let's keep doing it cause this short wheelbase, chassis with good power is awesome!"

Even though I still don't like the connected grille, I'm glad the M2C was a continuation of the OGM2 and was able to escape before the current status at BMW settled in.

At risk of waxing too much poetic about the f87 chassis, I’ll just say that I think it’s rad that a few guys at BMW understood that the perfect M car should be a blend of practicality and fun, rather than a blend of practicality and performance. Great performance should be an incidental byproduct of making the car fun, not the other way around.

[///M TOWN]

Originally Posted by 2M

There never was a "Base M2" . M2 ran the N55 until 2018, and in 2019 they switched to S55 , the N55 and S55 were never ran simultaneously in the F87, so I don't expect 2 different motors ran in the new chassis at the same time

I actually know all that

The OG was what I was referring to

The M2 Competition started production July 1, 2018

[chris719]

Originally Posted by ///M TOWN

It's has mostly to do with stability management

BMW spends countless hours data logging and testing each platform and programs each cars stability management accordingly

And additionally each major configuration has to be crash tested as well and that takes a shit ton of money as I'm sure we can all imagine without question

I'm sure it has something to do with stability management, too, as you say. I wonder about the crash testing, though. If they used B58 and ZF8 then I don't know it would require any new crash testing that wasn't performed for the M240i.

[XutvJet]

The B58 was introduced in 2015. BMW didn't use the B58 in the M2 largely because they weren't certain of its reliability in track use situations with the air/water intercooler and stock oil pump/sump. The N55 was tried and true by 2015. BMW simply used the forged crank from M235's N55, made some revisions to the piston rings, added the S55 oil pump/sump system for high G loads, and gave it a factory tune. The N55 could easily handle track duty except for the underspec'd intercooler. If you track an M2 N55, you need an intercooler upgrade to maintain consistent power on warmer days.

The M2 N55 makes the same whp/wtq as the non-MPPK tuned B58 (330whp/360wtq) on the Dynojet. The MPPK B58 in the M240 makes around 350whp/380wtq. The B58 does have a slightly better powerband and can sustain power to 6700rpms vs around 6200rpms for the M2 N55. The turbo on the B58 is slightly larger and the fueling system better for 400+whp gasoline (non-ethanol) applications. The N55 needs an upgraded HPFP to reliability handle 400+whp on gasoline only. Above 100mph and the B58 is the better motor with its wider powerband.

Yes, the B58 does have a closed deck, largely because the block is shared with the turbo diesels, but you never hear of block issues with the N55s, even ones running 500+whp. The N55 uses forged steel cylinder sleeves. The B58 uses arc-sprayed coating which are starting to show wear issues in certain tuned B58s which requires a short block replacement. The N55 is arguably easier to work on as well and parts are cheaper. The B58 has a number of extra coolant pumps and reservoirs, an air/water intercooler, and the timing chain and VANOS are on the back of the motor. BMW's long term reliability with rear mounted timing chains/tensioners has been terrible. The B58 also weighs about 50lbs more than the N55.

[chris719]

B58TU O1 as in M340i guise is much nicer for street use, a pity it wasn't ready in time. S55 is nice but has drawbacks like spun crank hubs, charge air cooler leaks, and vulnerable oil cooler location.

[SEAT TIME RULES]

Originally Posted by chris719

B58TU O1 as in M340i guise is much nicer for street use, a pity it wasn't ready in time. S55 is nice but has drawbacks like spun crank hubs, charge air cooler leaks, and vulnerable oil cooler location.

Good points but all are easy to remedy...

Every M car that I've owned has had a few "weak" points.

I've taken care of all 2 of the 3 on my S55...

1) VTT S55 Crank Bolt Capture

2) TMS Oil Cooler Guard

I'll replace the A/W Intercooler if it ever leaks.

These are all low probability concerns, but I track my cars quite a bit...

Both the N55 & S55 motors are strong. I wanted the S55 for 2 big reasons.

Much more upside to both tuning, and its robust cooling package.