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      02-02-2020, 12:18 PM   #17
AlexFL
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Drives: BMW
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Quote:
Originally Posted by Laki021 View Post
X5M/X6M: 553 lb-ft. 1800-5860 rpm.
X5MC/X6MC: 553 lb-ft 1800-5890 rpm.

X5 M50i: 553 lb-ft. 1800-4800 rpm.

So, they all have the same max torque and low rev performance should be the same(till 4800rpm).

Once above 4800rpm, the M models are much more performant.

This would also feel M models to feel slower in the low revs, but in reality this is not the case.

On the other hand, X3M and X3 M40i have completely different torque curves, M40i max torque starting much lower(369 @1520rpm) and X3M 442@2600.

So no, the X5M will not have the same issue as the X3M does.
These are just numbers that do not tell the whole story. The truth is that the S58 (X3M engine) is a high revving engine that by default operates at higher rpms than the B58 (M40i). What it means that in Sport and Sport+ mode (and D2/D3 transmission setting), the X3M rpms never drop below 2/2.5k even when you just casually drive around. You only experience the lag/lack of torque in the comfort mode or when you use the D1 transmission setting. To make sure the high revving S58 doesn't overheat, BMW put in one large central radiator and two smaller radiators, an engine oil cooler, and a separate transmission oil cooler.

Last edited by AlexFL; 02-02-2020 at 01:33 PM..
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