Have a look at the Prototype Supra's engine

kona61

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I have spent a lot of time looking at this from different BMW technical articles and part diagrams on RealOEM.

From what we can see, the Supra uses the BMW B58B30M1. This the same 3.0L inline six, however, it has an integrated "headifold" meaning there is not a seperate exhaust manifold. The turbo essentially bolts directly to the head. The U.S. market Z4 uses the BMW B58B30O1 which has a normal manifold.

The headifold is used in EU markets for quicker warm-up times and increased catalytic converter efficiency when starting and cruising under operating temperatures.

There is no indication that the U.S. Supra will have the filter, however, the engine still produces the same amount of power as other markets. We cannot currently say whether or not the Supra will make more or less power than the U.S. market Z4, however, we can say that the hardware changes mean that there are likely differences in their power-making abilities.
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Jeff Lange

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Countdown to Z4 head swaps?

Jeff
 

tisdrew

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Countdown to Z4 head swaps?

Jeff
For power gains, I don't think we'll need to. The aftermarket turbo community has been doing "hybrid" turbos for some time. This retains the factory manifold but upgrades the internal CHRA/wheels for some serious flow improvements -- I'm talking 200+whp not some dinky 40whp gain all of this while retaining near-factory spool characteristics because of the flow engineering done by the manufacturer on the manifold. There are a lot of equal-length runner manifolds in the aftermarket that are beautiful works of art but suck for spooling compared to a simple log manifold or the factory unit because they aren't really bench flowed or have flow engineered into them -- they're just meant to fit, be pretty, and have more flow at the sacrifice of velocity. If someone plans to do head swaps, they're likely in for an expensive road. There have also been some pitfalls with aftermarket manifolds like burning up o2 sensors because of thermal shock and poor placement, rubbing of other areas of the engine, or poor heat management causing nearby things to become heatsoaked/melted (wiring, coolant/oil piping, various plastics, etc).
 

kona61

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For power gains, I don't think we'll need to. The aftermarket turbo community has been doing "hybrid" turbos for some time. This retains the factory manifold but upgrades the internal CHRA/wheels for some serious flow improvements -- I'm talking 200+whp not some dinky 40whp gain all of this while retaining near-factory spool characteristics because of the flow engineering done by the manufacturer on the manifold. There are a lot of equal-length runner manifolds in the aftermarket that are beautiful works of art but suck for spooling compared to a simple log manifold or the factory unit because they aren't really bench flowed or have flow engineered into them -- they're just meant to fit, be pretty, and have more flow at the sacrifice of velocity. If someone plans to do head swaps, they're likely in for an expensive road. There have also been some pitfalls with aftermarket manifolds like burning up o2 sensors because of thermal shock and poor placement, rubbing of other areas of the engine, or poor heat management causing nearby things to become heatsoaked/melted (wiring, coolant/oil piping, various plastics, etc).
I dunno. I'm sure someone will do it. You can't aggressively port this head otherwise you will break into the water jackets and possibly compromise the integrity of the head. However, I agree. I doubt it will be a limiting factor until 800 > hp, the VW EA888 and Honda K20C1 both use headifolds and they can make good power.
 

Toyotawild

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What the b58 needs now is port injection. Ford is got it on the new 5.0 coyote and 3.5 eco. Maybe toyota will put their twist on this engine and add this. This would take away the fuel limit issues for this engine for turbo swaps.
 

Jeff Lange

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I don't think we'll need to.
I don't think so either, but that probably won't stop people from wanting to and/or actually doing it for some reason.

Jeff
 

Toyotawild

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https://carbuzz.com/news/this-500-hp-bmw-z4-is-the-stuff-of-nightmares

Check this out. I think this B58 will be a tuners engine. Theres so much aftermarket support for it already. It's like the ar-15 platform. Not the best platform to start with but theres so much R&D and aftermarket support you can build a great reliable precision weapon.
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