2012 Jaguar XJ Supercharged

[TheRookie]

I’m baaaack. Picked one up with 83K miles and every bell and whistle. Stickered for about $95K. It’s already a blast with 470hp but a tune and pulley will get me another 100hp for about $1200.

Nothing major found by the dealer. Dropping it off with a euro mechanic next week to baseline it i.e. all fluids flushed, new tires and brakes. Has the common supercharger snout coupler rattle that is more annoying than a problem. This weekend I will be detailing it and posting some better pics.

[Basement Paul]

I saw a white one driving the other day and thought of you. The black looks way better.

Nice ride!

-BP

[TheRookie]

Cleaned up nice. Interior is mint. Outside not bad but ultimately would need a paint correction to be super sweet.

[TheRookie]

Getting the car back on Monday. Went ahead and took car of the water pump and supercharger snout while I had it in for tires and fluids. Should be safe and sound now. Which means being more liberal with gas pedal.

Oh, and that rebuilt snout comes with the 7.5% reduction pulley for another 1.5lbs boost. Ended up ordering the tuner and tune today. Can’t wait! Likely see if I can get some dyno time with the shop that worked on my truck. Find out the real gains. Allegedly good for 580hp/532ftlb up from 470hp/424ftlb. There literally is no physical difference between my motor and the motors in the higher HP XF and XJ R models. Sad that it was such a conservative tune from factory but good to know I’m not putting crazy stress on it.

Also, got window regulator, alarm horn and door speaker parts so I can work on that soon.

[Basement Paul]

They detuned it so they could charge $10k more for the better one, even though manufacturing costs were probably identical. You're getting a bargain!

-BP

[TheRookie]

I did a little research and the price difference between the XJ Supercharged and XJR575 is $30K MSRP, though closer to 25 if you consider the extras it includes. Regardless, a bargain to get that same power for $1000.

Fun fact: my buddy has a 2018 Mustang GT. Decided to check out the weight difference. His is 4400lbs and my yacht is only 4200 thanks to aluminum frame and body.

[TireSmoker]

Thats a sleeper.. I'd never look at that thing thinking 500-600hp.

How is your buddy's car so heavy? Thats like 600+lbs heavy. Googling "2018 mustang gt weight" ~I get 3500-3800 lbs.

-Dave

[TheRookie]

My bad, pulled it for a 2021 per Edmonds. Must be the batteries.

https://www.edmunds.com/ford/mustang/20 ... res-specs/

[TheRookie]

The XJ is back from the shop with all new shoes, fluids, water pump and coolant pipes. All good maintenance stuff and the brakes are fine for now.

I ended up having the supercharger shout replaced with a 7.5% reduction for another 1.5lbs boost and perhaps 20hp or so. Definitely much stronger In the mid-range and I’m more comfortable pushing it now. The tuner is arriving next week. It all goes well, I’ll be on the dyno for a before and after next Friday.

This weekend I should knock out a few replacement parts. I got a nice OBD2 Bluetooth unit that has a simulated 0-60 and 1/4 mile feature. Might try and find some open space

[Basement Paul]

Did you ever find performance specs on a stock version of your car?

-BP

[TheRookie]

This is a good comparison between the SuperSport and the Supercharged. Which I’m kind like the SS at the moment. After tune it will basically be a XJR575. https://www.caranddriver.com/reviews/a1 ... xj-review/

[Basement Paul]

Probably still in the 12's with the whole family on board.

-BP

[TheRookie]

It may be Paul’s bday, but I’m very happy and got a nice present today. Red lines are pulley only and blue lines are with tune. Assuming 20% loss for an automatic, that’s 600hp @ crank, almost 130hp gain for $1K. *does a happy dance*.

Not much more I can do performance wise other than some minor improvements for intake and exhaust.

[TheRookie]

For the past few weeks, I’ve been dealing with a slow leak on one wheel despite new tires. The shop couldn’t find a leak but we suspected the old weld repair might have a developed a crack. Anyway, that was enough to make me sand and polish that new set of rims I got on the cheap that had some curb rash. After a lot of elbow grease, I added some really nice clear coat and boom, looking much better and not leaking.