10-08-2019, 07:16 PM | #23 | |
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All variants of BMW's B58 from the original 2016 340i to the newest G29 Z4 M40i (both US and EU spec) use a typical 6 to 2 manifold design that you would see on a twin scroll turbocharger. The Toyota Supra's B58 has the 3 to 1 sections of its exhaust manifold built into the engine cylinder head where the manifold is actually cooled by the engine coolant. This engine only has 2 external exhaust ports that go directly into the twin scroll turbo housing. |
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10-09-2019, 12:38 AM | #25 |
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Not at all. Dynos are showing anything from 410 to 430 at the wheels on M2Cs. Search for Fuel-it dyno thread on the forum, their stock M2C got over 430 whp in 118 degree AZ weather.
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10-09-2019, 10:37 AM | #26 | |
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I agree that there is some software manipulation to get the torque so high for the hp; normally a 50hp difference would generate a much larger difference in times compared to what we have seen so far..... though the vast majority of comparisons have been with the neutered euro version of the Z4. It would seem that the version we get here has basic performance parity with the Supra despite the hp difference. I'll chalk it up to the Supra having similar torque figures, power coming on a bit earlier and the slight weight advantage. 0-60 may be similar, in the quarter the extra hp should show itself but I wouldn't expect much of a difference. 2 cents, Dave |
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10-09-2019, 03:31 PM | #27 |
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No, they're just different versions of the B58. The Euro M340i uses a version of the engine that is almost the same as the American M340i and American Z4 M40i. The Euro M340i makes about 375hp which is a direct result of the GPF required for European cars.
The B58 version in the Euro Z4 M40i and Supra are just different. I think it's mostly due to tuning, but there are some B58 versions with different parts. For instance, the earlier 320hp versions of the motor did not have the head-integrated exhaust manifold that more modern versions do. |
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10-09-2019, 04:04 PM | #28 | |
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10-09-2019, 04:39 PM | #29 |
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It's seems that despite blaming the hp difference on the GPF, it doesn't "cost" that much hp in other BMW applications?? There are significant hardware differences between the Z4's B58B30O1 and the Supra's B58B30M1 - heads, pistons, conrods, manifolds, turbos, etc.
https://g29.bimmerpost.com/forums/sh...1621271&page=3 |
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10-09-2019, 04:56 PM | #30 | |
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The only differences pointed out are the pistons, rods, turbocharger, and head. Most likely the head, pistons (& rings) and conrods were just made to withstand a bit more power. The mechanical bits in the head are all identical. The only real part that makes a difference in power would be the turbocharger and the engine tune. And I bet the engine tune has more to do with the power bump than the turbo. |
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10-09-2019, 05:11 PM | #31 | |
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In America, all the newer non M Performance cars will now use the version of the motor with the integrated exhaust manifold like the 540i, 740i, (maybe the 840i?), and the X5 x40i. |
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10-09-2019, 05:26 PM | #32 | |
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Cheers, Dave Last edited by DPelletier; 10-09-2019 at 05:33 PM.. |
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10-09-2019, 05:37 PM | #33 | |
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IIRC the Supra B58 has mechanically restricted valve lift. I guess Euro z4 is same.
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10-10-2019, 10:16 AM | #34 | |
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Once the turbos actually begin to spool, the slope of Supra's curve is very slightly more steep but not nearly as much of a difference as those two particular dyno runs indicate since the Supra's run is "shifted to the left" due to starting from a lower RPM. |
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10-10-2019, 12:13 PM | #35 | |
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10-31-2019, 11:58 AM | #37 |
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E85 tuning is almost complete, Stage 2 turbo just arrived last week from Pure.
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