Quote:
Originally Posted by VIERsr
The S58 doesn't suffer from turbo lag, it just has a slightly high boost threshold (around 3000rpm). Not a big problem with the ZF8, the 6MT with long ratios suffers a lot more and it is much less responsive. But once the engine revs above 3000rpm it's a beast and there's almost no trace of turbo lag.
The B58 has a lower boost threshold (around 2000 rpm) and feels stronger on first input on the throttle (just like N55 vs S55)
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Not only is the progressive torque build on the S58 not an issue, it's a benefit. It's an intentional decision that improves driveability and control on corner exit. Other OEMs are doing the same (e.g., Porsche 992).
OEMs learned from their initial high performance turbo engines. Smacking full torque at 2K rpm can unsettle the car, especially with the F80's subpar traction control. BMW made same changes to the S55 later in it's lifecycle (e.g., CS models). It's less of an issue in the B58 given lower torque levels.