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      10-09-2019, 05:56 PM   #30
upsidedownfunnel
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Quote:
Originally Posted by DPelletier View Post
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
I wouldn't call them significant. According to that post, the crankshaft, bearings, valves, cams, and block are the same. Architecture seems to be the same as well. Everything works the same way and parts are probably interchangeable on both engine version.

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.