thanks for confirming what my seat of the pants dyno was telling me.

Z

 

I have a 2001 Jaguar XKR Coupe with 116k miles, if I put the car into sport mode, it takes off the line like a bullet. In regular mode, ie 2nd gear, the acceleration off the line is modest. However I also own a 2011 XF 5.0L without SC, it is much faster than the XKR probably due to the engine size difference 5.0L vs 4.0L. I agree with the other comments, drive the car hard to improve the overall performance.

 

OK looked up the 0-60 times because this didn't make sense. And XF has a 0-60 of between 5-6 seconds (the times are all over the map). The XKR typically between 4.8 and 5.2 (much more tightly grouped suggesting some XF folks may not realise they have a supercharger, I say that because the supercharged XF is around 5 seconds). So the XKR should generally be quicker than an XF and more in line with the supercharged XF. https://www.zeroto60times.com/vehicl...-60-mph-times/

 

Do you know what the settings of the measurement were?
a) "D" Position without Sport Mode engaged
b) "D" Position with Sport Mode engaged"
c) "Manual Shift" (2-3-4) without Sport Mode engaged
d) "Manual Shift" (2-3-4) with Sport Mode engaged

I assume it´s d) but maybe not.

 

No way to tell but these are track times so the drivers are going for as quick as they can get it.

 

I think the fastest times will be "B"

99.99% of all drivers will never shift as fast as the automatic transmission in the "D" position.

Z

 

Update:

a) Removed my MAF Sensor today - it looked pretty good already, but I still gave it a proper clean with a MAF Cleaner.

b) Checked my Throttle Body Cable and lo and behold: I had about 0.6 inches of slack to 100% Throttle.
This was also backed up by my OBD2 Scan reports that never gave me 100% Acceleration reading on my car, even when I floored it / WOT.
Proceeded as described in the forum and....WOW. Totally different car.
Much more responsive, even without Sports Mode engaged.
This is an easy fix with awesome results - definitely worth checking, if you think you car could and should behave according to the power it has.
Now it all comes down to make the power and acceleration of the car....audible

c) Was lucky enough to find a reasonably priced Seatmodule at Ebay, which I installed today. Voilá - my passenger seat now tilts backwards AND forwards. Wohooo!
(Does anyone here know about someone in Europe who can fix these modules, so I will have a spare one available?)

Things are looking up.

 

Cool, congrats!!

 

Cheers muchly, sir!

 

Every XK8/XKR owner should check for the infamous accelerator-cable-slack syndrome. So quick and easy to fix, and as many say after performing the tightening procedure, you wind up with a completely different animal....

 

There is no way adding Marvel Mystery Oil could have effected the throttle body. You would have to manually clean it. Fuel injectors are downstream.

 

If I had a Pantera the jags would seldom leave the garage. Although with the cost keeping fuel in my XKR, hate to think of doing it in a Pantera.😳

 

​​​​​​
Don't know if this could apply here. But most ford's are atleast partially made by Mazda. Many parts interchange. When working on a Mazda could often find parts cheaper for a Ford.

 

I thought these cars used a fly by wire throttle and the throttle cable was used in limp home mode only?

 

The cable serves as a fail-safe of sorts, Basically the system checks pedal position with cable position. That's very simplified and l am not sure of actual change points in the production run.

 

It appears to me the cable pretty much actuates the throttle position sensor. I have a xkr which has a different throttle body than xk8 But they appear to be quite similar. XKR is larger in diameter and shaped a bit different. I know in limp mode the cable doesn't have much control of anything. Mine went into limp mode and wouldn't go over about 2000 rpm no matter what

 

cable drives pps. pps has a lever. when the motor is declutched when you put the pps to the floor the limp lever contacts the throttle shaft

 

Ok. That explains a couple things. I'd prefer to have a good old fashioned cable that moves the butterfly's. Been having a hard time finding any information on these cars. Do you know anything about the obd2 data network? I'm assuming engine data is on k-line? If so do you know what other than engine uses that protocol? I recently bought a 2000 XKR with check engine light and will not connect to a scanner. Not sure if I'm going about this correctly. I've never really been on any online forums.Never really had time , I've always been working. So I don't have much knowledge of where and how to do what. So if I do something out of line, I didn't intentionally offend anyone. Any information on what uses what protocol, or where I could get information, and maybe something describing the different systems. I would greatly appreciate it. Mainly the engine and trans controls I'm quite capable of repairing this car Been a ASE and Ford master tech for almost 30 years. I just need to know what I'm working on.

 

K is for diag tools like a generic smog scanner or an elm327

when the WDS or IDS talks to it it uses can

 

See Electrical Guide JagRepair.com - Jaguar Repair Information Resource