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

[kona61]

Conclusion all you need from both the Z4 and and Supra to hit a 0 to 60 of 4.0 secs is 330hp and 369lbft. above that is where the remaining 40+hp start to show.

Well we don’t actually know any other performance metrics so it could be even with weight deficits and all.

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[Bryster]

This is gonna backfire on BMW and i will be LOVING EVERY SECOND!

 

[BRX]

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.

https://www.motortrend.com/news/2020-toyota-supra-performance-horsepower-suspension-trd/

Anyone read this motor trend article yet?

"There are no such particulate regulations (yet) in the U.S., so our free-breathing Z4 M40i will get the 382-hp B5830O1 version of the engine, which makes the same 369 lb-ft of torque. Unfortunately, our in-market Supra retains the EU filters and the resulting output."

These two different sources are contradicting each other directly unless I'm missing something. The only way to make sense of this is by saying:

1. The US spec Z4 has the O1 engine without the integrated manifold and without the particulate filter making 382hp.
2. The EU spec Z4 and both EU and US spec Supra get the M1 engine with the integrated manifold and particulate filter making 335hp.

Anyone in the US able to check if the Z4 does or doesn't have the integrated manifold?

 

[MA617M]

BMW press release said it has the integrated manifold.
The pebble beach car had the integrated manifold.

I think the motortrend article is wrong.

The B58B30O1 is a higher spec and a new head, the timing chain arrangement is modified.

https://www.ibmwclub.com/n/47910

 

[Kicol33t]

Norwegian Z4 makes 340hp

 

[GT-Four]

BMW press release said it has the integrated manifold.
The pebble beach car had the integrated manifold.

I think the motortrend article is wrong.

The B58B30O1 is a higher spec and a new head, the timing chain arrangement is modified.

https://www.ibmwclub.com/n/47910

Wait now I'm even more confused. Wasn't it the M1 with the integrated manifold that has a new head and chain design?

 

[Jeff Lange]

We will need to wait and see, but I suspect both the M1 and O1 have the integrated manifold.

(Note: This comment is based on no hard information).

Jeff

 

[Illsic_Design]

Yeah, too much contradicting info on the web to be certain now. If I can get a look at a Z4 this weekend I will try, if the local dealer has one.

 

[Captain_Kirk]

https://www.roadandtrack.com/new-cars/future-cars/a26064082/toyota-supra-bmw-z4-engines/

Why the Toyota Supra Makes Less Power Than the BMW Z4
The engines are nearly equal, but not equal enough.

The Toyota Supra shares a platform and a large majority of its components with the BMW Z4. But as we discovered last summer and recently confirmed, the Z4 will make 47 more horsepower than the Supra in top trim. Since ECU tuning has become so advanced with modern engines, the automatic response might be to think that it is all in the programming. A BMW parts catalog reveals that the changes go further than the code.

According to the BMW ETK catalog, the US variant of the Supra will be equipped with the B58B30C engine. It carries part number 11002463592, and seems very similar to the engine for the US-spec Z4 M40i. However, the Z4 engine is actually the B38B30B, and has part number 11002464415. What does that mean? There are internal differences. Searching the interchanges for the two part numbers shows that the US Supra engine is the same as what Europeans will see in their variant of the Z4 M40i, while the US M40i engine will be used in the new G20 M340i 3-series.

Digging into the motors reveals that the first different part is the cylinder head. The Z4 has a cylinder head part number of 11127934495 while the unit in the Supra is marked as 11127934494. The differences are not apparent based on the catalog illustration, and instead are likely to be in the castings of the cylinder heads as both use the same exact camshafts, valves, and ancillary components.

Moving to the bottom end, both engines use the same crankshaft and bearings, but the pistons and connecting rods are different. The Z4 piston–part number 11258678934–is found in a variety of BMW products including the US M340i and European spec 7-series sedans. The Supra piston–part number 11258681079–is found in the motor for the US spec 7-series and the X7.

Based on the catalog entries, basically every other component seems to be the same. The final difference appears to be in the turbocharger. The Z4 uses part number 11657934387, which is only shared with the M340i, while the Supra uses part number 11657934332, which is only shared with the Euro-spec Z4 M40i. Even though the turbocharger appears to be different, all of the clamps and mounting hardware are the same between the two. Even though the unit on the Z4 might have bigger wheels in it, there is a good chance that it should bolt right up to the Supra.

The hardware for the ECU is even the same; the two cars share the 86T0 DME. After looking at the parts, it doesn't look to be very hard to replicate the power of the M40i in the Supra.

For those that want to make an OEM equivalent, the primary components to change will be the pistons and rods as those are likely built to withstand a little more boost. Swapping the cylinder head and turbocharger would complete the package. A tune will take advantage of all of those components.

We’re likely to see tuner shops digging into these cars as soon as they hit the ground. Based on what I see here, it likely won't be very complicated for them to make even more power than the Z4 M40i.

 

[DesmoSD]

The hardware for the ECU is even the same; the two cars share the 86T0 DME. After looking at the parts, it doesn't look to be very hard to replicate the power of the M40i in the Supra.

For those that want to make an OEM equivalent, the primary components to change will be the pistons and rods as those are likely built to withstand a little more boost. Swapping the cylinder head and turbocharger would complete the package. A tune will take advantage of all of those components.

We’re likely to see tuner shops digging into these cars as soon as they hit the ground. Based on what I see here, it likely won't be very complicated for them to make even more power than the Z4 M40i.

Interesting and a little easier said than done given they will be BMW parts, it's a 50K car and is still under factory warranty. Toyota OEM parts were priced very fair so maintenance was simple yet easy on your wallet.

Because it has the Supra name, a lot more aftermarket support will come from Japan. This will heavily benefit the Z4 but in all honesty, how many Z4 owners are going to mod their cars?

 

[Bryster]

The hardware for the ECU is even the same; the two cars share the 86T0 DME. After looking at the parts, it doesn't look to be very hard to replicate the power of the M40i in the Supra.

For those that want to make an OEM equivalent, the primary components to change will be the pistons and rods as those are likely built to withstand a little more boost. Swapping the cylinder head and turbocharger would complete the package. A tune will take advantage of all of those components.

We’re likely to see tuner shops digging into these cars as soon as they hit the ground. Based on what I see here, it likely won't be very complicated for them to make even more power than the Z4 M40i.

Interesting and a little easier said than done given they will be BMW parts, it's a 50K car and is still under factory warranty. Toyota OEM parts were priced very fair so maintenance was simple yet easy on your wallet.

Because it has the Supra name, a lot more aftermarket support will come from Japan. This will heavily benefit the Z4 but in all honesty, how many Z4 owners are going to mod their cars?

This is where BMW f***ed up, they think one Zed4 will be enough...meanwhile Toyota got it on lock(easier ECU, more trims)

 

[DesmoSD]

This is where BMW f***ed up, they think one Zed4 will be enough...meanwhile Toyota got it on lock(easier ECU, more trims)

The MKV is essentially a single trim model since the 4 cyl isn't coming to the U.S. I was hoping that Toyota would offer it in traditional Toyota fashion without bundles and a base model like the Camry, Corolla and even GT86 in Japan offer.

 

[Bryster]

The MKV is essentially a single trim model since the 4 cyl isn't coming to the U.S. I was hoping that Toyota would offer it in traditional Toyota fashion without bundles and a base model like the Camry, Corolla and even GT86 in Japan offer.

I'm counting the upcoming GRMN version

 

[justbake]

Where are they finding part diagrams for the Z4 and M340i? ETK BMW doesn't show them anywhere.

Nevertheless this confirms they will have the integrated manifold head in the US

 

[BRX]

Road and track are looking too deep into this. They might have different part numbers, doesn't mean they are different in anyway other than just that, a number. If anything, the internals in the MKV engine might actually be superior to meet Toyota's reliability not the other way around. You would be out of your mind to swap OEM heads, turbo, pistons and rods to new OEM variants for just 47hp specially if they were pretty much identical.

Different cars share the same parts and when you look them up they come with different part numbers. Even the same car but with different MYs have different part numbers here and there even though they are identical. It's been this way forever at least with the Toyota cars I worked with.

My guess is the part numbers are differentiated for inventory management. Each engine is produced with a limited quantity in mind for specific cars and each needs a certain amount of spare parts. If they labeled them all the same, BMW wouldn't be able to differentiate if this parts number was more consumed by this engine variant or the other unless they have different numbers. Or simply to keep stock reserved for one kind of engine in a certain market.

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