top end limit
 

I just "air dried" my XF and expected to top out at the 119 mark. She kept pulling past that. What's up? I thought we were limited to 119? Anyone know how I got past that? I don't think it has been tuned previously.

They are not limited to 119. What made you think that?

I have read that all US spec V8 cars are limited to 155mph.


Easily obtainable for both the NA and SC cars.

Governor supposed to be indeed higher than 119mph - Car & Driver tested and claimed a whopping 123mph!

2010 Jaguar XF 5.0 Premium Road Test ? Review ? Car and Driver

VERY easily !!!

:icon_tinykitball: kept on going past that though.

4th day I owned my 2010 Premium I did over 130.


My 2013 SC I have only had to 125.

My previous 2011 was limited at 200Kph or 125 Mph.

I have been told that my newest is limited at 300Kph or 185 Mph...but I have yet to find that one out for sure...

155
 

I think my 2011 might be limited to 155mph (250kmh) Did that on the mile long straightaway at BIR (Brainerd International Raceway) last summer
(46°25'18.3"N 94°16'50.0"W)
But that is all it would do, ran out of track. Did not really feel the limiter kick in like my XJ8 does at 126mph.

One thing that nags at me is that the newer 3.0's show 180 top speed on the speedo. The XF tops out at 165. Not that I would EEEEEVVVVER try to see if it can go that fast on a public freeway/tollway/road when other cars are there.

The speedometer is never traditionally an indicator of top speed. I couldn't even tell you what the max speed is on any of mine lol because it doesn't really matter what it says. I can tell you I've done 150 in my XF though.

the S/C cars have a speedo that goes to 180 doesnt really mean anything though?

Speedos and tachs are general dictated by aesthetics. Some performance cars play up their image with high numbers. Some cars earn it, most cars don't. So many high performance cars out there with over 200mph on the dash but they can't even get close to that on their best day. Our tachs read to 8 thousand rpm, they won't rev that high though. Aesthetics.

And that's just fine. No big deal. I'm just glad they aren't being pressured by the government anymore the way they were in the 80's and 90's which led to the infamous 85mph speedos.

Power cut out at about 125 - Felt we could have gone a lot more. She felt very stable at 125. Love this car.

In model year 2011 the speed limiter on 5.0 NA is 121mph, on 5.0 supercharged it is 155mph. This is 121 true, not indicated which tends to be somewhat higher. I have hit this wall a number of times, the car is still pulling hard with obviously a ton of juice left. It is very disappointing to have a quarter of the car's design capability arbitrarily denied to the owner. Jaguar USA has admitted this was done in order to force some sales up to SC and R models, which they feared they could not sell if the more "base" cars had almost the same speed capability. The NA speedo also reads to 180mph, but because of the limiting can only go two thirds of the way.

Before my tune, my 2011 XFR would indicate about 162 on the speedometer as the limiter kicked in and stopped the acceleration. GPS indication was closer to about 157-158 range.

After my tune, I have had the car indicating 175 with a GPS log showing only a 0.5 (negligible) difference.

Next time you see a radar speed sign, set your cruise control to 60mph. You'll see the radar reading back about 57-58!

So, what tires are furnished OEM on the cars limited to 121 mph? I thought the tire speed rating dictated the speed limiter setpoint from the factory.

After the decision was made to deliver the cars to the North American market limited to 121mph, the next decision was to save money by delivering them with H rated (130mph) tires. Cars delivered to European markets are unlimited or limited much higher and are delivered with higher speed rated tires. Imagine them trying to sell a nearly 400hp sports luxury sedan like the XF in Germany or Italy with such a low top speed.

2012 XF 5.0 NA, verified personally to be governed at 123mph

Are you pretty sure which was the chicken and which was the egg?