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    • Adding the N63TU twin turbo V8 to the 2014 F15 X5 xDrive50i makes for a 5300 pound 12 second SUV

      Many people have likely forgotten this but BMW did make high performance SUV's long before the X5M ever went on the market. Back with the first generation E53 X5 over a decade ago BMW produced the X5 4.8is model which was the highest performance X5 in all the land. With 355 horsepower and 360 lb-ft of torque from the 4.8 liter naturally aspirated N63 V8 it hustled the 5090 pound X5 to 60 in 6 seconds flat and through the 1/4 mile in 14.5 second at 96 miles per hour.


      How much have things changed in the decade since? The xDrive50i is not even the highest performance X5 available although until the new X5M hits it is the highest performance X5 available for the new F15 generation. It is roughly the equivalent in the model range of the X5 4.8is of a decade ago since an M model did not exist back then. In 2014 what this means is a 445 horsepower and 480 lb-ft twin turbo 4.4 liter N63TU twin turbo V8 powered 5306 pound monster that hustles to 60 in 4.3 seconds and through the 1/4 mile in 12.8 @ 109.

      To put it another way, quicker and faster than every M3 produced prior to the last generation E92 M3. You could line up next to an E39 M5 at a stoplight and pull away while sipping a latte. That is how fast BMW's SUV's have become but notice that they have not gotten any lighter. This generation was supposed to improve in that area by a couple hundred pounds (according to BMW who somehow keeps overstating their weight loss) but when weighed it turns out it actually isn't any lighter.

      Everyone will no doubt state this is very impressive acceleration and it is but there is one thing that old X5 4.8is did better than this new car. It went through the slalom quicker and pulled .83g on the skidpad to the 2014's .81g. It also stopped 5 feet shorter from 70 miles per hour.

      Hey, as long as this one is faster that is progress right?


      Source: Car and Driver

      This article was originally published in forum thread: Adding the N63TU twin turbo V8 to the 2014 F15 X5 xDrive50i makes for a 5300 pound 12 second SUV started by Sticky View original post
      Comments 28 Comments
      1. BlackJetE90OC's Avatar
        BlackJetE90OC -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I wonder why. E70 just a better buy as dealers clear them out?
        No sales were in line with other years.
      1. Amerkin's Avatar
        Amerkin -
        I just got one of these in the x-line but with the 20in wheel and tire option (275/40 front 315/35 rear Dunlops) with the adaptive suspension that has the electronic controlled roll bars. It is a blast to drive and handles quite well in sport mode. I had driven all the past X5s mentioned here and this is a much more refined vehicle, much stiffer structure and a big jump in ride quality. I was actually shocked at how smooth it was on the 20s as I was a little concerned they might make the ride a bit harsh. I had to get out and check for sure that it had run flats. The steering is way to light in comfort mode but significantly firmer with more feel in sport mode. It is pretty quick. It's my business vehicle so I'm able to write off about 50% of the purchase price in the first year with the current tax code so I'm not too concerned with the fast depreciation value. I've owned BMWs for years and I'm used to it. I'm very happy with the new X5 50i.
      1. Droptopp's Avatar
        Droptopp -
        Kind of makes me cringe running a 12.2 in the tuned X5M. I better be in the right gear or be in the GTR. Lol.

        Kudos to another great SAV. My '12 X5 5.0 best was a 12.90 on stock 20" run flats with Dinan stage II making 380/460 on a mustang dyno. This new X5 must be making slightly more.

        Cant wait for for a tune available to see some 12.6's.
      1. Amerkin's Avatar
        Amerkin -
        Ran the X5 50i at Famoso last night. Best pass was 12.940@107.27, 1.953 60ft. This was with a tune on the mid setting and 5 gals of 109 unleaded added to 1/2 tank of 91 pump gas. I don't know for sure but I believe a larger mix of 109 would have retrieved even better results. The temp was about 73-74 degrees but high humidity 35%. DA not sure of but based on my last running at Famoso on May 18 when it was cooler and drier (1950 DA), I suspect it was well north of 2000. Bone stock it ran 13.014, best mph 106.44, 1.93 60 ft.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Amerkin Click here to enlarge
        Ran the X5 50i at Famoso last night. Best pass was 12.940@107.27, 1.953 60ft. This was with a tune on the mid setting and 5 gals of 109 unleaded added to 1/2 tank of 91 pump gas. I don't know for sure but I believe a larger mix of 109 would have retrieved even better results. The temp was about 73-74 degrees but high humidity 35%. DA not sure of but based on my last running at Famoso on May 18 when it was cooler and drier (1950 DA), I suspect it was well north of 2000. Bone stock it ran 13.014, best mph 106.44, 1.93 60 ft.
        Please post hte slip and tune details. A separate thread for this is probably a better idea.
      1. Droptopp's Avatar
        Droptopp -
        Have you ran any quicker times since your last post?
      1. Blaizon's Avatar
        Blaizon -
        I plan on taking mine to the track soon. I too do not believe the claimed numbers from the factory. I am surprised at how fast it can get going though.
      1. Amerkin's Avatar
        Amerkin -
        Click here to enlarge Originally Posted by Droptopp Click here to enlarge
        Have you ran any quicker times since your last post?
        No I haven't been back to the track. It's just too hot to run a good time and speed. I plan on going in November to the final Test and Tune at Famoso Raceway when the temps are usually decent, but nothing like the east coast. We can see DAs in the hundreds at that time where as typical summer DA is 3000+.