Hi Everyone

I was searching online to find out what Jaguar actually did to "detune" the XF Supercharged Engine to get it down to 470HP. Did they just reprogram and/or drop down the boost? Or is it something more...

Thanks
Dave

 

I'm also interested in this and a couple other things.

What's different with the suspension? Just stiffer springs and thicker anti-roll bars?

Is there any difference with the exhaust?

 

I found some good information, but nothing really about the engine or exhaust.

http://www.leftlanenews.com/jaguar-xfr.html#
http://www.leftlanenews.com/jaguar-xf.html (select trim)

 

I've been talking with Dave at Spires who has confirmed that the engine is the same and the only thing limiting the XF Supercharged power versus the XFR is the ECU.

 

So has anyone changed the programming to the XFR programming?

I find it hard to believe though that it's any different -- I drove an R and my Supercharged and didn't feel any difference... I don't know how many XF Supercharged models they make but I'm sure it's not too many. And to make a special ECU programming to detune... Maybe it's just different settings. Oh well really doesn't matter both are crazy power and awesome!

So what do you get for the extra $12,000 between an R and the Supercharged:

• Vented Hood
• Different 20" Wheels
• Awesome Seats (which alone are worth the 12k!)
• R badging
• Racing School!
• R front grille
• Rear Spoiler

Either way this is just a fantastic car. I get so many people asking what it is. It just a crack up!

 

The next thing for Jaguar to focus on is faster throttle response. There's a distinct delay when you hit the gas pedal as if the car is deciding whether to respond or not. I suspect it's the delay between supercharger not working and when it is.

It would also be nice to have a bit more power. The XFR is a heavy car so 550-560 hp would make an appreciable difference. I'm sure it's chippable to a point where you don't stress the gearbox and driveline unnecessarily.

 

I keep considering ECU reprogramming, but then I drive it on the track and change my mind. It's plenty fast for my taste. I'll put money into the suspension first.


Even in sport manual with dynamic mode? I've noticed plenty of sluggishness in all the auto modes, but not sport manual.

 

But to be fair it's a nano-second in sport/dynamic compared to what feels like a second or two in normal mode. I think its probably more to do with the supercharger than anything else. It's still a helluva car so this is nitpicking to perfection.

 

Hi! What is the full form of XFR? and what is XFR programming???

 

Im blocked at work from image search can someone post a pic of the package, please? Im dying to get a look

 

New to Jag - picking my first up on Saturday - 2011 XF Supercharged. Test drove the XFR and the XF-S back to back. Could not feel any difference around town or on the highway. Decided to keep $12k. Although I think I may miss the hood scoops and seats but it's $ to put into other cars

As to sluggish response, don't know yet but if the Jag has a electronic throttle, then the issue is often with the potentiometer. Not that anything is wrong with it but it is often a design issue that can be corrected. I have what we call a drive-by-wire module on my Maserati that instantly transforms the throttle response from delayed and sluggish to extremely aggressive with the flip of a switch. It simply adjusts the signal coming out of the potentiometer to the throttle body control.


Any views on Stratus Grey - I'm second guessing myself.

 

I'm w/ you Ramp - I couldn't notice the difference.

But I do miss those seats!!

What color did you get?

 

Well, looks like I changed my mind. Went to the dealer to look at the color - Stratus Grey - just to make sure and ended up switching my order to a Stratus Grey XJ.

 

The XF Supercharged was created to fill the void for those customers going to a dealer and who want to drive home with a car, but cannot find an XFR in stock. That said, the $12,000 that one spends on the XFR buys a little more performance, even if not discernible from the seat of the pants, the cosmetic differences which are significant, the interior difference which are significant especially in special colors, and most importantly exclusivity.

They are only importing 300 -350 XFR's per year into the United States. You are guaranteed not to see many of them.

I just took my XFR service, and there was one other XFR there. One of the young employees was giddy telling me that he's never seen 2 XFR's in service at the same time . . .

 

Also, the brakes and suspension calibration are entirely exclusive to the XFR.

 

Considering that the XFSC (2009MY) was "created" before the XFR (2010MY), that doesn't make much sense

 

yup i just had two XFR's together they are very rare. One got winter tires lol. The R model does have different shocks stiffness and spring rate them the XFSC. The R is fully loaded where the XFSC in not. both are great cars and even the normal XF is awesome.

 

Jagtech: Where did you see the two XFR's?? It may have been mine since mine was in service this week and has winter tires . . lol

 

DukeDallas: I think you misunderstood. I was talking about MY2010 XF Supercharged that came out after the XFR with the 470 hp Supercharged motor.

 

Yes, I misunderstood. You're correct, when the 2010 lineup was first announced, there was no XFSC. It is a bit of an odd model in that there's no direct competitor amongst its chief rivals. The XFR aims at the M5 and E63, while the XFP takes on the E550 and 550i.

I do think it's a useful model in the lineup and wonder what the take rate is amongst the 4 XF models.