Hello, Im new to learning what makes cars go and what does what in say of performance. I just recently bought one of the Cars ive always wanted. A jaguar Xjr 2002 model with a supercharged v8. I wanted to come on here with others who have a plethera of information on the subject of making this car faster and meaner. I want my first jaguar to be as memorable as anything i have obtained.
So please give me some comments on some ways to take this baby to the next level. Everything is stock except for the Dual exhausts that were put into the car not too long ago!

 

You want to make a 2002 XJR faster ? Where are you going to be racing it ? You sound like me when I was a teenager. A supercharged V8 with DOHC and 32 valves and you want to learn by working on it to make it faster ? All I can say is, this would not be my choice for a car to learn on, and, to add more horsepower to this car will cost a whole bunch of money since it's already ripped with 370 BHP. I admire your enthusiasm, so don't take it the wrong way, but I'd concentrate on keeping it stock and running in tip top shape.

 

one of our members has a twin-screw kit he developed personally for your XJR and XKs of the same engine size (4.0L)

I think there's a pulley you can replace for a bit more boost on the SC, and besides porting/polishing and adding something else to cool your SC air intake even more, that's about the extent of performance I believe.

 

Spend thousands of dollars on tools and diagnostic equipment.

Spent thousands of hours learning to build engines for performance with forced induction.

Spend time testing on dynamometer to qualify that work.

There's no easy, bolt-on upgrades that produce the performance hikes that American muscle cars seem to be able to produce, it's an English saloon.

While you go on your journey of power, consider the brakes, with "go" you need "stop" just as much.

 

In reality i see the error in my ways but i do not like being at the 370. A friend mentioned a possible performance chip? I looked around and most seem like a bunch of garbage.Anyone care to elaborate?

And thank you for the comments i apreciate you guys taking the time to read , and reply.

 

What has not been mentioned is YOU. The XJR has more power than you could ever need. It can be very dangerous if handled incorrectly. A performance driving school is the best thing you can invest in. This sounds like your first car, so insurance costs will probably keep you from spending much to explore additional HP. There is a good chance that by completing one of these courses, your insurance company will cut you a deal on your premium. And most importantly, what you learn could save your life!

 

Do yourself a favor and search and read through older threads. There's plenty of info out there already.

 

This is actualy my first car i can admit. I saved for a long time. I think i was about 10 when i saw this car . I knew i wanted it and saved every birthday gift, Lawn mowing jobs, And cleaning up peoples junk. I bought this and its the same giddish feeling i had around it when i was even younger. Ecstatic with joy at having it as my own.
Also i will look more into that, Thank you!

 

Agree 100% about learning to drive right to begin with. Even if you don't have the money for a good road course, an autox course can be very enlightening.

 

I apreciate you all looking out for me. Ill see if i can find any around here in tulsa.

 

There is nothing scarier with having the rear come around on a rwd car because you took a turn to quick. With the XJR a simple blip on the gas can cause a downshift leading to more power and boom your now going the other direction. Once you learn how to control this it can be an absolute blast. Brought the rear around 2x today merging onto the highway. It is so much fun to do right but deadly if done wrong.

 

It sounds like it man! I would love to learn that!

 

Have you seen this site...?

http://www.matmoranmotorsports.com/


David

 

Hey Oklahoman,

Here are some pricey performance upgrades I can think of...

- K&N Air Filter
- Larger SC pulley
- Exchange the middle section mufflers with straight tubes
- Get yourself smaller diameter tires 255/30 18 or 245/40 18 instead of 255/40 18
- Get rid of all the useless and heavy stuff in your car (spare wheel, jack, toolbox)

And if you want to go further, get rid of more heavy stuff, remember the weight to HP ratio is paramount for accelleration.

I can think of... speakers, rear window motors, steering column tilt and reach motors (set it once to your needs and remove the motors) electrical seat motors (again, set it once to your needs and remove the motors), remove the electric pumps of the lumbar support (you are young, you don't need that anyway ), replace battery with a smaller one, remove fog lamps (who needs fog lamps) and replace openings with plastic covers, ...

The list goes as far as you are willing to contribute the luxury for faster acceleration...


David

 

Wow, I'm starting to love this place. Thank you guys so much. Looking into it now.

 

Why smaller tires?

 

Mounting smaller (in diameter) tires would give you a better "transmission" ratio.
It's like changing the diff to one with a "better" ratio, just cheaper.
(See Mat's site, he is using smaller tires on the rear axle for his 1/4 Mile races.)

For example...
The stock XJR tires (255/40 18) have a rolling circumference of 207.7 Centimeter.
255/30 18 only have 191.7 Centimeter.

Downside is that you'll loose some of your top-end.
But as long as you don't go on the Autobahn like I do you don't really need top-end speed.


David

 

Smaller tires are lighter and more responsive in race/autocross settings as well. Smaller wheels have the same effect. This idea is to have less unsprung weight which creates less draw on the drivetrain and more power to the ground. But I'm kinda missing the point with many of the performace suggestions. I mean, you wanted a Jaguar not an S4, right? I don't think you are trying to alter the nature of this car...?

 

I'm not trying to alter it to significantly. It's at 370 horses right now. IDE like to get past at least 410.

 

lower pulley upgrade/belt/tensioner-idler pulleys. Cone filter with cowl so not to draw too much hot air from around engine, and a good exhaust system should get you around 400, costing iro $3000+
or,
buy a short 4.2 motor and put your heads on. Dyno the car before and after. Tools will be specialist. There's hi flow cat's too, Nameless on here does them.
or,
There's killerchiller kits, nitrous kits, water meth kits, but if you don't know what your doing, you'll be looking in your rear view mirror at engine parts....