A torque converter takes away around 20-30% of the power.
In the case of the V12 it’s also 5 speed manual, v 4 at best if not 3 at worse auto.
Also the GM auto is usually in the wrong gear at the wrong time and 1st and 2nd are too high and locks out 1st above around 20 30 mph without valve body mods.
Also rubbish engine braking provision so cooked brakes.
SDUs issues have nothing to do with pics.He obviously wants my matching ID and V5 details and he ain’t going to get them.
What we talking here?..
A contract killing? 
Who put this in yer head…Winseer?
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I’m getting very lazy with my auto transmission. 
There are more serious problems than an irrepairable brake line.
Seriously Carryfast, the performance differences are negligible, even for boy racers on congested motorways.
Are you sure that you actually know how to drive ?.
3 speed GM slushbox anchor negligibly slower than 4 or 5 speed manual.
With around 30% of the power turned into trans fluid heat and cooked brakes because that’s all you’ve got to slow it down with.
This one really isn’t mine, it’s also possibly a little bit slower it sounds like it could be on standard single throttle bodies, but it shows why Tom Walkinshaw didn’t choose a 3 speed GM 400 slush box to win at Bathurst.
The F type is torture to drive for any distance.Typical low seat on the floor driving position which I hate.
The V8 F Pace SVR is bleedin brilliant and a riot to drive so long as the speed limiter is switched in.The latest auto transmissions also downshift nicely and provide plenty of engine braking.
My favourite is the new Defender 6 cylinder Ingenium or V8 petrols.Like driving a 160 mph bonneted Maggie Deutz which handles like the F type.
So now we’re getting to the nub. You like to fantasize about being Walkinshaw.
I’m reasonably confident that I know how to drive. So confident in fact that I regularly descend the Great Dividing Range, in both of my automatic cars, controlling the decent with the gearbox alone.
How often do you cook your brakes driving around south London? You have the temerity to question my ability.
You’re overrating yourself.
Yeah ok, but have you got a contract out on him?..
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No need, give him enough rope…
If you can’t understand how a 5 speed manual, makes a good car, that’s lumbered with an obsolete 3 speed auto, better, what other conclusions are there other than you don’t know how to drive.
I actually built it for European trips and track days.It’s done far more miles on the continent than here.The only time it ever went over the London border was for its annual MOT test before I SORNE’d it.
My XF has a 8 speed auto box. 
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Although I have to say that in a car I’d sooner have five gears than three, whether manual or auto. I think lorries are different because of the the massive power and torque ranges involved. In a rather arse-about-face way, drivers using 180-powered wagons back in the day longed for 16-speed 'boxes to help them keep the old girl singing. Fast-forward 40 years and you had drivers with 500+ horses to play with and torque wherever you needed it, rather wishing they had an 8-speed box instead of 16, so they didn’t have to keep skipping gears. All a bit academic now that everything seems to auto, though.
I do think the bit about manual making you a ‘better driver’ is a red herring if the auto box is good enough. Having said that, I’ve driven with early auto boxes that I could deffo beat, but not on fuel-consumption!
That’s why I like my Jag, it has gear paddles so I can change gear myself.
Every auto can be driven in manual mode, car or truck.
I recently drove an ACM Volvo. In manual mode I could get it to make more noise and use more fuel, but not go any better. Such are the modern autos, the only genuine time manual mode can be justified is on a steep decent.
Someone with limited experience, like Carryfast, couldn’t outperform a modern automatic.
I had a DAF with auto box fitted, it was factory set-up for that year 2016.
If Manual was selected, and a particular gear wanted it obeyed…until you went on off the throttle, when it selected Auto itself and did what it wanted.
The first time it happened was when manoeuvering between two buildings on a narrow twisty hill in the wet.
Poxy horrible hateful machine. I had a serious conversation with my boss and the computer was altered when I got back to the dealer.
Another time I was descending a mountain road when a truck came around a curve on my side of the road, I did a very hard brake to avoid him, then came off the brakes again as he woke up and steered the thing. At this point the engine had stalled, but the truck was still doing 30 or 40 kph, with no power steering.
I am sure autos are better now, but those experiences put me right off them.
Great for m-ways and towns, but not for all uses.
Adaptive computer control was a pain in the fundamental, in fuel trucks. By the time the truck unloads the computer has learned to change gear as if it were loaded. The reverse happens when reloaded. Newer autos have improved out of sight.
A torque converter type transmission is by definition inefficient because of torque converter slip which is transferred into the hydraulic fluid as heat.
The gear clutch packs also slip more than a manual clutch during shifts.
Torque converters have been improved massively in that regard with locking clutches and less slip with the closer ratio gear packs.
The ZF 8 speed is about as good as a torque converter type transmission gets.
Also the return to a mechanical, not torque converter hydraulic, engine/transmission interface, is mostly what makes EV’s so quick off the line.
But in this case specifically we’re generally comparing 1950’/60’s auto transmission technology which was laughably poor.
In general manual transmission adds value and driving pleasure to most cars fitted with it especially when combined with the larger V8 and V12 engines.
For SDUs information yes of course TWR fitted the Group A XJS with manual transmission for the reasons I’ve given.He followed fast road ‘tuning’ practice in that regard, we didn’t follow him.
It would still actually ultimately be quicker with a 6 speed manual.
It’s why the V12 was the last of the Jaguar race cars.It was too difficult and expensive to convert the V8 to manual.
It would be great to see a manual F Pace SVR as a special limited edition last of the ICE line.