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Hello! I have an XKR 2013 coupe and am thinking about engine tuning. Raise 510 horsepower to 560. Those of you who have done it, is it worth it, does it make a big difference?
I had spent a good amount of money ”tuning” the xjr. And sure, on the airport runway my 0-60 and 1/4 mi timings were better.
(not that they were not decent to begin with).
But in the day-to-day driving, there was little difference. The singular improvement that always presented itself was the Quaife LSD, not the engine tuning.
You have the “electronic” diff already. (Though I prefer the mechanical one)
I use my xkr as it was designed to be used; a grand tourer, enjoying winding roads in all weather conditions and many “longer trips” over the weekends. For this car (and my LR4) I have spent money on multiple sets of mounted tires. The right tire for the conditions, if you would. And i've never been more pleased.
Hi! The XKR-S has 560 horsepower as the original with the same engine and it is a light programming that is required. It is a lovely GT car that can handle long trips well. At the same time, it is a fun sports car with performance. So why not have both parts with the same car. Tires are very important for the right purpose. As well as front and wheel settings. I am mainly looking for performance around 80-140 km. And of course the torque. And my XKR is only an enthusiast car that is used during the summer months. But the interesting thing is how big a difference it makes in practice.
Originally Posted by guy
I had spent a good amount of money ”tuning” the xjr. And sure, on the airport runway my 0-60 and 1/4 mi timings were better.
(not that they were not decent to begin with).
But in the day-to-day driving, there was little difference. The singular improvement that always presented itself was the Quaife LSD, not the engine tuning.
You have the “electronic” diff already. (Though I prefer the mechanical one)
I use my xkr as it was designed to be used; a grand tourer, enjoying winding roads in all weather conditions and many “longer trips” over the weekends. For this car (and my LR4) I have spent money on multiple sets of mounted tires. The right tire for the conditions, if you would. And i've never been more pleased.
It depends what you want to achieve with that extra power. Even in standard form these cars aren't under-powered or slow and whether you will really be able notice any difference on the road, I have my doubts.
Personally, if the car isn't tracked I wouldn't bother but I, as Guy says, I would have the best tyres on the car. You get the benefit of these at all speeds. I went for the Continental SportContact 7, which transformed how the car feels. Mine isn't used in the winter so one set of tyres is fine, even though I have a set of winter Pirellis, which came basically free with a set of Nevis alloys. They work, but they are winter tyres, so a big compromise when it never sees snow, ice, or even cold days.
Good tires are a given, nothing I compromise on, neither on the Jaguar or my other cars. The purpose is of course the fact that I like performance, and find it fun. But the main question was how much difference does it make in practice? Maybe some XKR-S 5.0 owner can answer.
Originally Posted by neilr
It depends what you want to achieve with that extra power. Even in standard form these cars aren't under-powered or slow and whether you will really be able notice any difference on the road, I have my doubts.
Personally, if the car isn't tracked I wouldn't bother but I, as Guy says, I would have the best tyres on the car. You get the benefit of these at all speeds. I went for the Continental SportContact 7, which transformed how the car feels. Mine isn't used in the winter so one set of tyres is fine, even though I have a set of winter Pirellis, which came basically free with a set of Nevis alloys. They work, but they are winter tyres, so a big compromise when it never sees snow, ice, or even cold days.
Car and Driver back in the day tested both a coupe XKR and a cabrio XKR-S, albeit in in different tests. There was no difference to 60 mph and only a 10th to 100 mph. Even if one expects the coupe to be a little bit lighter and a little bit faster, I expect that the difference will be very hard to notice at this level.
Car and Driver back in the day tested both a coupe XKR and a cabrio XKR-S, albeit in in different tests. There was no difference to 60 mph and only a 10th to 100 mph. Even if one expects the coupe to be a little bit lighter and a little bit faster, I expect that the difference will be very hard to notice at this level.
I prefer having the 3 distinct sets of tires/rims:
Z rated, summer only tires. (3 mo of the year). Warm or hot roads.
Z rated, All season tires. For the shoulder months. (5 months). Cooler and possibly wet conditions.
and Pilot Alpins for the winter. (those remaining 4, freezing conditions).
Until the right tires are installed, engine tuning is wasted as max power can not be applied to the road.
I’ve said it before… such a perfectly well balanced car. Even on those trips up to the ski hills, WRXs and Quattros can’t get away from me… they are surprised .
Jags are not much for modifying at all. You get what you get, then MAYBE a bit more for a cubic foot of cash.
However, you CAN get the 550 hp XKR-S tune on the XKR, with modified exhaust, using a modified version of SDD. That alone isn't cheap, and is only 40 hp improvement.
The best thing to do to get the performance is to make sure everything operates as correctly as possible, from air filters, new good fluids and fresh plugs and coils. Also good tires are an absolute must-have (this removes any michelin from contention).
As I wrote, I'm interested in how much of a difference it makes. I'm going to do it in the spring so we'll see what I think after that. But it would be fun to hear from someone who has done it.
Originally Posted by Cee Jay
Jags are not much for modifying at all. You get what you get, then MAYBE a bit more for a cubic foot of cash.
However, you CAN get the 550 hp XKR-S tune on the XKR, with modified exhaust, using a modified version of SDD. That alone isn't cheap, and is only 40 hp improvement.
The best thing to do to get the performance is to make sure everything operates as correctly as possible, from air filters, new good fluids and fresh plugs and coils. Also good tires are an absolute must-have (this removes any michelin from contention).
As I wrote, I'm interested in how much of a difference it makes. I'm going to do it in the spring so we'll see what I think after that. But it would be fun to hear from someone who has done it.
Yeah, I did it. I replaced the center resonators with an X-pipe, removed fuse 19 and put the R-S tune into my car (along with the R-S top speed).
Barely noticeable seat-of-the-pants, but the top speed was measured (at least it was well above the 155 mph, though not up to 185 due to upset wife). Not actually a part of the tune, but still fun.
It's the tires that are most noticeable. Nice, grippy ones will be fun, especially if you have crap first to compare.
If you want more low end grunt, get new, good shorter tires, and if you want highway improvement, get taller tires. Not much of a difference, but that's the formula.
I know another member who spent many thousands on a bunch of parts, almost $10k if I remember... new intercooler, pulleys, I think a reworked supercharger, and maybe a worked throttle body plus a custom tune. For all that money, he got about 100 hp more than stock.
Thanks! Fuse 19 was the first thing i removed, just for the sound 😀
And the tuning is just for fun, i did that on other cars as well. And 0-60 is not the main goal.
And i know tyre is very importent,
Even on my regular cars I am careful with the tires. And there is a big difference in quality and road holding. What I am thinking about is whether the gearbox needs to be reprogrammed at higher power. Then an upgrade to all the brakes is probably also required. But we will see in the spring. My dream car is the XKR-S GT, but they are so few and hard to find.
Originally Posted by Cee Jay
Yeah, I did it. I replaced the center resonators with an X-pipe, removed fuse 19 and put the R-S tune into my car (along with the R-S top speed).
Barely noticeable seat-of-the-pants, but the top speed was measured (at least it was well above the 155 mph, though not up to 185 due to upset wife). Not actually a part of the tune, but still fun.
It's the tires that are most noticeable. Nice, grippy ones will be fun, especially if you have crap first to compare.
If you want more low end grunt, get new, good shorter tires, and if you want highway improvement, get taller tires. Not much of a difference, but that's the formula.
I know another member who spent many thousands on a bunch of parts, almost $10k if I remember... new intercooler, pulleys, I think a reworked supercharger, and maybe a worked throttle body plus a custom tune. For all that money, he got about 100 hp more than stock.
Just so you know, the -GT is the same as the R-S with a different steering rack and a bunch of funny plastic stuck on the body. Hardly worth the $120k price tag. You could have two R-Ss or four XKRs. Six XKs. I'd not mind having one, but not for that much.
I find it hard to believe no-one has mentioned Velocity AP (VAP) yet.
You can easily bump a stock 510 PS XKR to 600 PS with a VAP crank pulley and tune, see here: https://www.velocityap.com/product/j...so-ecu-tuning/
At $1939 US I reckon that is a bargain although unless you are handy with the spanners you will probably need to pay someone to fit the larger crank pulley.
Alex says he has something like 600 hp on a tune, I don't know what-all goes with it though, nor the cost. I considered that until I realized that I'm old.
Agree with OzXFR? VAP is simple and effective. Start with a lower pulley and a tune. You will NOT believe the difference that makes!
My 2014 XJR puts 540HP to the rear wheels on a dyno and it flat gets it! Heck it even improved my gas mileage which was completely unexpected.
If that's not enough then add the upper pulley and port the blower. Also we now have a transmission tune. Finally Harrop out of OZ has released the biggest gun of them all. The 2300TVS upgrade. VAP has just started selling this and so far I have not read any reports from people who have them yet so it's still rare. Power increases are still unknown as there are options for the TCS2300 as well. Smaller pullies and porting the blower
Your lucky because these DI 5.0L SC engines are very simple to increase the power a lot compared to the old 4.2L V-8.
One tip is VAP runs yearly sales and you can save a good bit by waiting.
As always the old saying still applies to ALL cars.
Speed costs money how fast do you want to go?
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More horsepower??
