S55 Motor Without Turbos

[TractionControlDelete]

Hey folks. I have some questions about the S55 motor sans turbos. Obviously, I know that the S55 is derived from the N55 and so forth but my real interest:

Is the S55 without turbos essentially a E9X 328i N52B30? Or is it more comparable to the E36 S50B30? Or perhaps some other BMW inline-6 that I haven’t considered?

Curious to know but my search of the forum didn’t bring anything up that clarified matters. Thanks in advance to anyone who can help with info.

[MineralWhiteF80]

are we talking about design and construction, or are we talking power/performance comparison?

Fun fact: Ive been running a 10psi E40 tune recently and it is so much fun. Power/Torque gauges read 375hp and Im having a blast driving around and flooring it everywhere and only gets wheel spin in 1st gear lol

[TractionControlDelete]

Originally Posted by MineralWhiteF80

are we talking about design and construction, or are we talking power/performance comparison?

Fun fact: Ive been running a 10psi E40 tune recently and it is so much fun. Power/Torque gauges read 375hp and Im having a blast driving around and flooring it everywhere and only gets wheel spin in 1st gear lol

Nice! I guess you’re essentially driving around with E9X M3 power in a lighter/stiffer F8X chassis.

I mean from a power/performance standpoint. The N52 is 268 bhp
at 6,650rpm and 232 lb-ft at
2,750rpm. Meanwhile the S50B30 is 286hp at 7,000rpm and 236 lb-ft at 3,600rpm. My thinking is it’s more like the S50 in light of the bore (86mm), stroke (85.8mm), and compression (10.8:1) being relatively close to the S55 specs.