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2/3 seconds seems a very long time, but there is a definite "do you really want to do this" moment when I floor it with my XJ. I've come round to thinking it's an inherrent delay caused by fly by wire accelerator and the gearbox and engine ECUs talking to each other.

As other posts have suggested, I leave it S all the time (mainly because the higer revs make it easier to control the car should the need arise) and a smoother application of the accelerator produces better acceration (especially from a standing start). I also use the J gate quite alot and with a bit of practise find it works well if I need to floor it.
 

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I had a test drive in the XF SV8. There was no perceptible delay in throttle response at all. Floor it and the car growls at you as it takes off. The sound of the engine/exhaust was fantastic. It brought a huge grin to my face.
 
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