The Z4 (382hp/3.9 0-60) is more powerful & quicker than Supra (335hp/4.1 0-60)

[MT6]

The newly released 3 series (G20) has 374PS for the EU version (with filter) and 382hp US so i find it strange for BMW/Toyota to release their new sportscars around the same timeframe with less power.

Who would have thought a few years or even months ago that the new "Supra" will be outperformed by a 340i, when it used to be faster than a M3.

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[MA617M]

Which lends me to think that perhaps the 382 is a tuned M1

 

[MA617M]

https://www.press.bmwgroup.com/usa/article/detail/T0285141EN_US/the-new-bmw-z4

Answered my own question.

The 382hp Z40 is the B58B30M1

 

[SupraFiend]

Supra too...
https://www.topgear.com/car-news/detroit-motor-show/its-finally-here-meet-brand-new-toyota-supra

"Toyota helpfully provides the engine code, B58B30M1, which is the same as the Z4 M40i. Same for the ZF 8HP51 transmission, and the whole suspension hardware and the platform. Pretty well everything under the skin started life at BMW."

 

[justbake]

I’m so lost. I’m guessing BMWBlog’s article is wrong then?

Which cars have the O1?

Why does the M1 X5 only make 335hp here in the US?

Is this why the A90 and X5 have different turbos on realoem?

 

[BRX]

I’m so lost. I’m guessing BMWBlog’s article is wrong then?

Which cars have the O1?

Why does the M1 X5 only make 335hp here in the US?

Is this why the A90 and X5 have different turbos on realoem?

From my understanding, O1 is without the filter and M1 is with the filter. (Source: https://en.wikipedia.org/wiki/BMW_B58)

If the Supra is getting the M1 only regardless of where it's being shipped, that explains the 335hp. (Contradicts what's on Wiki which isn't reliable anyway)

But if it does get the O1, it's either:
1. Detuned.
2. Underrated to not show any discrimination between regions.

I wouldn't trust RealOEM's part numbers as of yet, maybe by the end of the year after people start getting delivery of their cars.

 

[MA617M]

The M1 and O1 have completely different heads, not to do with filter. Both are the part of the B58TU - please see the link above.

Both A90 and Z4 have the integrated exhaust manifold, as demonstrated by official press releases for each vehicle.

The wiki article is wrong, sadly. I spent hours researching the B58 to work out what the differences are.

 

[MA617M]

I’m so lost. I’m guessing BMWBlog’s article is wrong then?

Which cars have the O1?

Why does the M1 X5 only make 335hp here in the US?

Is this why the A90 and X5 have different turbos on realoem?

We don't know what vehicles have the O1 yet. There hasn't been an official bmw press release regarding the B58 technical update, so it's all been from leaks, but the sources are legit.

The A90 has a different turbo because it's the A90. One of the key differences.

The 382hp Z4 is still the integrated manifold engine (M1) just tuned higher than the usual 335hp.

 

[BRX]

Remember the Goodwood event A90 that didn't have the integrated manifold? Was that completely scraped off? Also this was posted on another thread before and basically says the O1 is superior to the M1.

Until BMW sheds some light on us, all the conflicting information and leaks on the internet are not going to get us anywhere.

 

[MA617M]

Yeah, it turns out we were completely mistaken. The flange we were looking at was the first of the two runners on the M1 head.

And yes, the O1 is the upper specification.

https://www.supramkv.com/threads/have-a-look-at-the-prototype-supras-engine.1357/page-48#post-31998

Keeping in mind that the BMW press release states it has the water-cooled exhaust manifold, and the A90 press release video clearly shows the M1-manifold design.

 

[kona61]

Yeah, it turns out we were completely mistaken. The flange we were looking at was the first of the two runners on the M1 head.

And yes, the O1 is the upper specification.

https://www.supramkv.com/threads/have-a-look-at-the-prototype-supras-engine.1357/page-48#post-31998

Keeping in mind that the BMW press release states it has the water-cooled exhaust manifold, and the A90 press release video clearly shows the M1-manifold design.

See my question is what does the O1 look like? I haven’t seen any clear evidence that states or pictures it as having an actual exhaust manifold. Personally, it doesn’t make sense why BMW would design two two heads all for the sake of just having more power in the U.S? Most integrated headifolds are cheaper to produce etc. so I suspect that the o1 actually doesn’t have a separate manifold unless someone knows something I don’t.

 

[GT-Four]

Yeah, it turns out we were completely mistaken. The flange we were looking at was the first of the two runners on the M1 head.

And yes, the O1 is the upper specification.

https://www.supramkv.com/threads/have-a-look-at-the-prototype-supras-engine.1357/page-48#post-31998

Keeping in mind that the BMW press release states it has the water-cooled exhaust manifold, and the A90 press release video clearly shows the M1-manifold design.

I don't get it. They put a lower spec engine in a sports car. What will they put the upper spec in? A luxobarge? Is the integrated manifold that big a bottleneck?

 

[kona61]

I don't get it. They put a lower spec engine in a sports car. What will they put the upper spec in? A luxobarge? Is the integrated manifold that big a bottleneck?

No, not really. The VW EA888 and Honda K20C1 both use a headifold and both are engines that are known to make big power.

 

[Nurburgring]

As we know, the 2019 technical update for the BMW "B" engine family" (B38/48/58) includes several modifications on the existing B platform: New fuel system, single piece chain drive, split engine cooling and the integration of the exhaust manifold into the cylinder head. This applies to the new B58B30M1 engine used in the Z4 M40i and 6-cyl Supra.

As for the B58B30O1 with the non-integrated exhaust manifold, I believe it´s just a continuation of the previous gen B58, not a separate B58TU or a "higher specification" unit. I base this on the tecnical documentation prepared by the BMW team (available here https://www.supramkv.com/threads/have-a-look-at-the-prototype-supras-engine.1357/page-48#post-32318). They don´t make any mention to different "versions" of the head, the new engine integrates the manifold, period. The previous version may be carried over for a few models.

 

[Matt RR]

the extra cost hardly seems worth it. MKV Supra also looks much nicer IMO

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