Here is a copy from a post in my thread on the jaguar forums.

I arrived at Eurocharged right at 4:45 PM and was greeted by the staff. Everyone seemed very polite and professional. One of the guys went to my car with a laptop to (I think) read the original file, and then he pulled the car around back to setup our first dyno run.



Here you can see Jerry strapping down the car.







Here are two of my baseline dynos. Not bad! Best one was 481 rwhp. The runs were carefully done in 4th gear. If you floor it too soon, it will downshift to third. I think we actually did three pulls. One was discarded because of a downshift.





Removing and replacing the new pulley took the most time, by far. There isn't much room at all to access it. The old pulley was carefully cut off and the new pulley was heated up and put on. This took about 2 hours, plus the motor needed to be cooled down a bit before they could even start. The tune was installed while the pulley was being removed. I hung out in the office and chatted it up with Jerry and his staff. From what I gathered, they all love to fish and play with cars all day. Maybe one day I will take an offshore fishing trip with Jerry on his boat.





I was very happy to see the results, a gain of 58.6 rwhp! My initial prediction was 50-65 rwhp...So I pretty much hit that right in the middle. I went from a peak output of 481 rwhp to 539.6 rwhp, with nice gains all across the RPM band. The torque numbers between 2500-4000 look especially nice. That is usable real estate right there.





I will have more data available to post when they send me the charts via email. We also looked at AFRs and everything looks great.

The Eurocharged Houston location has a Dyno Dynamics dyno, and it seems quite calibrated. I have read these are some of the most accurate dynos.

If my baseline was 481 rwhp and we account 15% for drivetrain losses:

Doing the math conservatively, 481 x 1.15 = 553.15 hp, and the XKR-S is rated at 550 hp, so this is very close. The only other mod I had on my baseline run is BMC air filters in the air boxes.

If that is true, and my final number was 539.6 rwhp, then lets add in drivetrain losses (539.6 x 1.15) = an estimated 620.54 HP, which is an estimated gain of 67.39 hp. I say these numbers are an estimation because I don't know for sure if 15% is the exact number for drivetrain loss on this car, but it should be close.

In closing, I hope this information is helpful for someone who might be considering a pulley and a tune. After I drive it a for a week or so I will comment further on driveability, but so far it seemed perfect on my trip home.

I must say, I'm extremely satisfied at this point and I can only recommend the guys at Eurocharged. I think they did a great job. Thank you all for reading this thread.

 

I'd love to see a trap speed from this car. I bet it's a blast with the top down and all that noise/power

 

1/4 mi times for Xkr-s range from 11.8-12.2, since the car is very difficult to hook up. I have seen trap speeds of 120-122 mph.