Interesting to hear your comments A5/S5 as I did the same. But I much preferred the S5 torque delivery, it's so instant. I found the A5 TDi very peaky, great from 2-4000 revs but otherwise the S5 wins all the way. Having had a turbo for 5 years its so responsive. I just leave it in 6th most of the time and that you cant do in the TDi.Was very very tempted by the S5 and took a long time to decide. In the end I did a back to back road test of both (driving each car twice) and found that once I was on the move the A5 was more comfortable and strangely enough more drivable. Also, given most of my mileage is fast A roads and Motorway the A5 seemed just as quick, more progressive whilst being half the fuel cost. I would love to see the in car acceleration times from say 50mph to 100mph for the two (using the gears to best effect for both cars, rather than in say 4th gear).
The A5 diesel will also be easier to map and obtain a further 40 - 50 bhp and lb/ft torque (making it probably quicker that the S5 from 40mph upwards... would like to hear from anyone who has done this yet).
Yes, the 3.0 TDi is very punchy when the turbo is working, but off turbo its rather limp and I found it couldn't take 5th or 6th gear at anywhere like S5 speeds. I did find the power band very narrow, like the 170 TDi VW engine and you have to adjust your driving style to get the best out of it.Bryce... left you a long PM, hopefully this might give you more info on my thoughts.
Chris... I know what you're saying about the torque of the V8, it is instant and you don't have to change gear all the time to access it. I drove my S4 around in 4th gear nearly all day long (just like that Top Gear test that Clarkson did in the Aston). But, I quite like the surge feeling you get with turbo and cammy engined cars, that's just me however and I'm not saying one is better than the other. I agree that the S5 is probably still the ever so slightly quicker from 50mph - 100mph than the stock 3.0tdi, but with the diesel remapped (MTM) and pulling all the way to the redline rather than its 2.5K rev powerband, hmm... I think the diesel might take it. We ought to look at this when we all manage a meet when some cars have been modified to see if my hunch has any value to it...
I am just giving my views on the A5 v's S5, not slagging it off.I also choose the A5 3.0 TDI over the S5, and it was not for financial reasons... It's different, it's certainly not limp. I think every driver should try both and see what is best for their driving style. This is not to say one car is better than the other, just that I happy not to be the only "fool" here who preferred the A5 over the S5
AH! Now I see the context, I understand. That surge when the valve timing hits the sweet spot! Especially noticible in VVT type cars.Cammy was refered to by AntRS6 initially, I'm sure as an engineer you know what I mean