Anyone remapped a 5.0 (naturally aspirated) XK?

[Garry1127]

Just wondering if anyone out there has experience of remapping a standard 5.0 Xk?

I have a few questions.

Remapping usually sharpens up throttle response (which would be nice) but given the XK can struggle with traction in the wet, does this sharper response cause any problems?

Is the 20 - 30hp/torque gain noticeable?

Any improvement in mpg?

thanks

[N6 JMX]

Hi Garry, not aware of anyone remapping a NA 5.0 litre XK, but several have undertaken this on the 5.0 litre XKR and have certainly noticed the difference, especially when combined with other tuning details.

The folks at Paramount and Elite should be able to advise you, but most of the remapping is undertaken utilising Viezu maps.

N6 JMX

[Garry1127]

I've been looking further into remapping my XK 5.0 NA.

There is an interesting variation in how much power increase I would get from remapping the 5.0 NA engine.

• Superchips 28hp.
• Celtic tuning 30hp increase.
• Remap Kings 28hp increase.
• Hyper chips 29hp increase.

But there are many others saying only a 20hp increase.

• Mallory Performance 20hp increase.
• Quantum 20hp increase.
• Avon Tuning 20hp increase.
• Chip Tuners 20hp increase.

My question to the more knowledgeable out there are these differences due to different remap software or just variations in what the different companies claim?

 

[N6 JMX]

Hi Garry, as previously intimated, not aware of anyone having the 5.0 NA XK remapped, so not sure how many there could be out there to offer an opinion. However, I suspect that the relatively low power increase available is more due to the remap parameters than the absolute maxim that could be achieved if one were to take a 5.0 NA racing for instance.

That aside, I would suggest you need to ask yourself some questions about the value of making such modifications as I can tell you that a modest increase of 20 - 30 HP will not be noticeable in a car that already has some 385 HP on tap. The top speed will still be limited to 155MPH, the 0 - 60 MPH time will still be around 5 seconds (standard is 5.2 seconds) and on UK roads you cannot use the level of power the car currently produces.

What other parameters does the remap alter? MPG, torque?

Why not simply swap for an XKR?

N6 JMX

[Garry1127]

The remap will be in association with an Elite four pipe back box which supposedly releases another 20hp so overall I'm looking at a 40 - 50hp increase, but the main driver is looks (4 pipe) deeper noise and a slight increase in mpg which will increase the cars touring range, gaining a slightly sharper quicker car is a bonus.

I prefer the XK to the XKR as it has a smoother ride, a lovely supple feel in corners (still with little roll) and has better ground clearance.