4.2L XKR & 5.0L XKR Tune Results
#61
The fuelling strategy on the 5.0L is very different to the 4.2L, because the 5.0L is direct injection. The stock 5.0L is very lean at light load & part throttle, and at WOT until the VVT switches, that's just how they do it, which is another reason why the AFR curve on the 5.0L looks a bit strange.
#62
#63
I did another dyno run today. Unfortunately they haven't combined this run with my previous one so I have had a quick play with a graphics package to superimpose them.
There is a decent improvement in power. Torque has gone from 614Nm to 674Nm and power has gone from 463rwhp to 502rwhp. If you assume a 10% drivetrain loss that puts it bang on the power of the XKR-S.
Not bad for just adding an x-pipe and 20 minutes with SDD applying the XKR-S tune!
Next step is a smaller supercharger pulley.
There is a decent improvement in power. Torque has gone from 614Nm to 674Nm and power has gone from 463rwhp to 502rwhp. If you assume a 10% drivetrain loss that puts it bang on the power of the XKR-S.
Not bad for just adding an x-pipe and 20 minutes with SDD applying the XKR-S tune!
Next step is a smaller supercharger pulley.
#64
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u102768 (03-07-2018)
#65
We had the last drag meeting of the year today so I did some runs with my new, improved 2010 XKR. The standing quarter times haven't shown great improvement with the XKR-S tune but that is probably down to my traction issues (12.521 v 12.533).
The terminal speed however has jumped from 115.73 to 118.50.
It has been a bit of a motor racing weekend because the local Jaguar Drivers club hired the race circuit for the afternoon on Saturday so we got to do quite a few high speed laps. I took great delight in pulling away from a 2016 Aston Martin DB9 GT on the start/finish straight.
One of the members brought along his D Type which judging by the date of registration is a genuine original.
Someone else had a racing E Type which was far quicker than mine through the bends but I left him for dead on the straights. He came over to complement me on the power of my car afterwards.
The terminal speed however has jumped from 115.73 to 118.50.
It has been a bit of a motor racing weekend because the local Jaguar Drivers club hired the race circuit for the afternoon on Saturday so we got to do quite a few high speed laps. I took great delight in pulling away from a 2016 Aston Martin DB9 GT on the start/finish straight.
One of the members brought along his D Type which judging by the date of registration is a genuine original.
Someone else had a racing E Type which was far quicker than mine through the bends but I left him for dead on the straights. He came over to complement me on the power of my car afterwards.
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MarkyUK (09-30-2018)
#67
The tyres are OEM Dunlop SportsMaxx's. Unfortunately the car came with them and there is loads of tread left so I am loathe to replace them for the sake of it although they are noisy and don't grip very well.
My 4.2 had the same tyres on when I first bought it and I switched to Michelin Pilot Super Sports when I got a terminal puncture in one tyre and the Michelins were so much better.
As soon as I can justify it I will get some of the new Michelin Pilot 4S's
My 4.2 had the same tyres on when I first bought it and I switched to Michelin Pilot Super Sports when I got a terminal puncture in one tyre and the Michelins were so much better.
As soon as I can justify it I will get some of the new Michelin Pilot 4S's
#69
A few videos of my day at the drags.
My 2010 XKR v 2009 Mercedes AMG CLS 63. On paper it should be a good match for a standard XKR as it has 507 bhp but with the XKR-S tune I was able to leave him behind quite comfortably:
A Dodge Charger (I think). He had racing slicks so got a much better start. I lost that one by 0.006 seconds so another foot or so and I would have had him.
The white Nissan GTR you see at the beginning of the video is owned by the guy who does my dyno runs and he did a 9.8 second run before getting his wrists slapped for running in less that 11 secs without a roll cage. It is one fast car!
This is just a drivers eye view of the drag circuit. I wasn't racing anyone so turned my camera to look forward:
I was pleased to see in the stats for Sunday's meet that I had the best reaction time in my class of 0.00745 and 4 of my runs made it in to the top 25 (0.00745, 0.06020, 0.08666 and 0.12707) so I have got that side of it sorted. Now I just have to sort out the traction!
The last video is of a drive by of a D Type and racing E Type at the local Jaguar club meet:
My 2010 XKR v 2009 Mercedes AMG CLS 63. On paper it should be a good match for a standard XKR as it has 507 bhp but with the XKR-S tune I was able to leave him behind quite comfortably:
A Dodge Charger (I think). He had racing slicks so got a much better start. I lost that one by 0.006 seconds so another foot or so and I would have had him.
The white Nissan GTR you see at the beginning of the video is owned by the guy who does my dyno runs and he did a 9.8 second run before getting his wrists slapped for running in less that 11 secs without a roll cage. It is one fast car!
This is just a drivers eye view of the drag circuit. I wasn't racing anyone so turned my camera to look forward:
I was pleased to see in the stats for Sunday's meet that I had the best reaction time in my class of 0.00745 and 4 of my runs made it in to the top 25 (0.00745, 0.06020, 0.08666 and 0.12707) so I have got that side of it sorted. Now I just have to sort out the traction!
The last video is of a drive by of a D Type and racing E Type at the local Jaguar club meet:
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u102768 (04-11-2018)
#71
#73
#74
Is it an AMC Hornet? Nope my buddy just told me its an Australian Chrysler Charger / Chrysler Valiant Charger https://en.wikipedia.org/wiki/Chrysler_Valiant_Charger
Last edited by TexasTraveler; 04-11-2018 at 03:54 PM.
#75
#77
#79
Is it an AMC Hornet? Nope my buddy just told me its an Australian Chrysler Charger / Chrysler Valiant Charger https://en.wikipedia.org/wiki/Chrysler_Valiant_Charger
Apologies to my Aussie cousins!
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Cee Jay (04-11-2018)
#80
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u102768 (04-11-2018)