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Originally Posted by KoenG
You state the AT is never dropping rpm below torque peak? Hmmm??? I guess your AT needs some servicing then.
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The M135i produces peak torque from just 1250rpm, the ZF8HP gearbox has lower gearing and different mapping than the diesel variants. Even in eco pro there's not many situations where you'd have less than 1250rpm.
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The 330d has a beefy 560Nm, the M135i has a respectable 450Nm. The 330d just delivers ~24% more grunt at low rpms, and seen it hits in a few rpms lower, it will provide you with at least this surplus every single time you push the accelerator. It's as simple as that.
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It's torque at the wheels that accelerate a car though not at the engine.
The diesel 330d has around 24% more "Peak" torque but the diesel auto's have a 20% taller final drive and the 330d has peak torque over a much smaller rev range than the M135i. (330d 560NM 2000rpm to 2750rpm)(M135i 450NM 1250rpm to 5000rpm)
That means in any given gear the torque reaching the wheels is only 4% higher in the 330d and only for a very narrow rpm band. The M135i has the the advantage of using it's torque earlier in the rev range and for much longer in each gear.
Cheers
Lee