Having gone from a 16V with a tuned F7P 1764cc to a totally standard Williams, Ive got a few thoughts about what theyre like in comparison.
The first thing was that my 16V was making over 150bhp (128 ATW) so if you take the basic pub-talk theory, my Williams shouldnt be any quicker. But it is. The first time I drove my Willy it felt only about the same as my old Valver in a straight line, although I put that down to the lack of noise (the Willy has no IK, s/s exhaust or de-cat) and the fact youre really changing about 1000rpm "early" compared to the 16V as standard.
In fact, the Willy is a lot quicker. Granted, if you floored it in say 3rd or 4th at motorway speeds, my 16V would have given my Willy a good chase (especially given that the Willy gearbox has a taller 5th gear). However, if you add some roundabouts, corners and T-junctions the Willy instantly makes a stronger case for itself - with about 85% torque at 2500rpm and 100% all the way from 4500rpm to the redline (dips at 5000rpm with the F7P 16V). It a very different car from A to B, with no major loss of progress if you drop off cam, unlike a 16V.
I can see why some would argue that the F7R 2.0 is a "tractor engine" or lacks a bit of character compared to the 16V, but Im not convinced that having had the use of both engines over a long period theyd still choose the Valver lump except for extensive tuning and racing. As a day to day B-road car, Im more than chuffed with the 2.0 and would recommend either a complete Williams car or the F7R bottom end to most moderately enthusiastic drivers.