Panzer Division A heavily tuned, supercharged X5 by Dinan that’s more than just a little bit tank-like. Panzer Division Affectionately known by owner Jay Belknap as the Panzer German tank, this X5 happens to be packing some heavy artillery thanks to a Dinan supercharger conversion… Words: Dan Wagener /// Photography: Dan Wagener & Ryan Lee
Traditional love stories typically begin with ‘once upon a time’ and end with ‘and they lived happily ever after’. Most people would hope that held true for every relationship, but through past experience we all know it to be an unrealistic expectation. Some relationships can start out as planned, but take a turn for the worst. Others may start out rough, but were all worth it in the end. For Jay Belknap and his #2003
X5 it was the latter.
Ever since Jay had a daily driver it’s been some sort of truck/utility vehicle. It was something cheap and paid off which allowed him to sink money into his 1994 Mitsubishi 3000GT VR4. But once he was satisfied with how the VR4 turned out, he figured he’d get the truck he had always wanted – a supercharged Range Rover Sport. So he went on the forums and asked the owners how they liked them and whilst half said they were awesome, the other half didn’t know because they were always back at the dealers. He then started researching the runnerup, the E53 X5 (keep in mind this is before the X5M had made its debut) and found that the 4.6iS could be supercharged through #Dinan
for a modest cost so he decided to look for a clean example finished in black. Months of searching showed no luck and he eventually gave up.
Then one day, about half a year later he randomly browsed for X5s on the market and found a oneowner 4.6iS with 85k on the clock for sale in Texas. It just so conveniently happened to be finished in black Sapphire, was supercharged and came with Brembo brakes together with an E46 M3 steering wheel already installed. Sceptical that it had to be some sort of scam, additional photos proved it was, in fact, the real deal, so he took a flight out to Houston a few days later with a cheque in hand.
As he walked out of Houston International the black X5 whistled down the arrival ramp. It was freshly detailed and ready for him to take on a road trip back to Virginia Beach. He got in, exchanged pleasantries, got the paperwork done and proceeded to drop the previous owner off at his work. But as soon as they left the airport the check engine light came on! The previous owner said he had a guy who was an old BMW master that did all the previous work and that he would have it fixed, right then. So they headed over to the shop and found a boost leak from a clamp that wasn’t tightened down all the way. Already four hours behind schedule, Jay was ready to head home. When he finally got on to the I-10 East, he punched it and the supercharged #M62B46
responded as you would expect. Jay was instantly hooked, forgetting that his previous Range Rover Sport even existed.
After about an hour into Louisiana though, the supercharger belt decided it was no longer going to be friends with the engine. It took out every other belt and the A/C tensioner on its way out, too. Jay shut the truck down and got a tow back west to Texas. That tow truck broke down so another tow truck took him the remainder of the distance West on the I-10 to a hotel in Beaumont, Texas, two blocks away from Beaumont BMW. He figured he’d be the first one into BMW the next day, get it fixed and be on his way.
Well, he was the first one on to the lot, but the secretary arrived and informed him that their service shop is closed on Saturdays. She invited him inside to call yet another tow truck, to get him further west to Momentum BMW in Houston. It was at that time the service manager, who was coming in to do his end of- month reports, had overheard Jay’s situation and started calling his techs. One was awake and said he’d be right in. They got him back on the road with just a new main belt (no A/C belt/tensioner or S/C belt). The previous owner called back and paid BMW for the work. Jay thanked him and said if anything else happened on the way home that he’d take care of it from there (nothing more did happen though). He later found out that the blower bracket tensioner needed an alignment.
Needless to say it was not a desirable first 24 hours of ownership. On a good note though, Jay later established a relationship with Dinan’s aftersales support team. They got him set up with the parts needed to fix the tensioner rod and belt. Like any machine, it simply needed maintenance.
Now, to the untrained eye, Jay’s X5 may appear as if it came this way from the factory, but the finer details tell all about this rare beast. If you’re not familiar with the 4.6iS model, it had a very short 2002-2003 production run. #BMW
had injected the standard X5 model with steroids metaphorically speaking, just like they do with the M models. These factory enhancements included larger fenders flares, massive 20-inch wheels, larger/louder exhausts, a unique variant of the #5HP24 #ZF5HP24
transmission, aggressive camshaft profiles, the high flow intake manifold from the older M62 cars, bored, stroked and compressed to a 10.5:1 ratio producing 342hp and 354lb ft of torque. What makes Jay’s X5 even more rare is that it’s 1 of 27 #Dinan
supercharged X5s in the world. The Dinan Signature 3 package consists of a #Vortech
V-2 S-Trim Supercharger running 5.5psi, a new #MAF
and throttle body, a #DME
and EGS flash, larger #Delphi
37lb injectors, and an E39 M5 fuel pump.
One common goal of any true performanceoriented enthusiast is to put as much tyre on the road as possible. With that in mind, together with the weight of the vehicle and the additional power, Jay sourced another pair of 10.5x20-inch OEM Style 87 rear wheels to replace the narrower 9.5-inch wide fronts. A set of four Bridgestone Dueller HP Sport 315/35/20 tyres were then fitted all-round and the improvement in grip from the 315 section tyres up front was like night and day. Behind the concave design Style 87 wheels sits giant eight-piston #Brembo
callipers fitted with 380mm/15-inch discs at the front and 355mm/14-inch at the rear to help bring the X5’s larger rolling mass to a halt on demand, without a hint of fade.
To accommodate the lower offset wheels, Jay also added the #BMW-X5-Le-Mans-edition
wider front arches and the rear wheels were spaced out 25mm with #H&R
spacers to help balance the front-to-rear track width. A Dinan strut bar and camber plates were also added to include some extra bracing for the twisties.
At around 107,000 miles the supercharger’s high speed bearings on the impeller shaft got a little noisy, so with help from friend and mentor, Tony Acker, they sent the blower off to Vortech, and performed the M62 timing guide and valley pan job at the same time. Vortech returned the supercharger with a newer Si-Trim impeller, which meant even more mid-range power than before.
During the summer of 2011 Jay decided it was too hot and had lost trust in his OEM water temp gauge. He also wanted to be able to read and clear codes on the fly so he removed the cluster, fixed the infamous pixel problem whilst there and integrated a PLX Devices DM-100 into the cluster. In addition to the OBD date, the DM-100 was installed with PLX Boost, EGT, dual-WBO2 and oil pressure modules. Other installed electronics include a Tekonsha P3 trailer brake controller, and a hardwired K40 Dual front/rear RADAR detector and front LASER jamming system.
With the engine refresh and monitoring equipment fitted, everything was working tiptop. Then, one day as he came up a steep on-ramp that had a sharp crest to it, the X5 got airborne for a split second. Unluckily for Jay, he was at the top of the engine’s 6600rpm range when it happened. Inertia took over and all the exhaust valves were damaged, bad enough to notice under load and to make matters worse, the intake cam gears spun about the cams. With Tony’s help, they did compression, piston height, and leakdown tests before removing the heads and sending them off to VAC Motorsport for a Stage 1 upgrade, including stainless steel intake valves and fancy Inconel exhaust valves. Whilst it was there, Jay happened to come across a rare 4.6iS Tubi Rumore cat-back exhaust system. As Tubi is mostly known for making exhausts for exotic cars Jay was surprised to discover that they even made one for the X5! After installing the original heads, now blessed by VAC, a huge improvement in power and efficiency was found. The result is a power figure of around 475hp, although Jay has never taken it to the drag strip, he’d like to think it’s possible to break 12 seconds in the quarter-mile. Not bad for a ten-year-old German tank, which is the reasoning behind the name ‘Panzer’.
Today, Jay’s 4.6iS S3 has 135k miles on it, and has been supercharged for 133k of those miles. He would like to thank Dinan Engineering for its outstanding aftersales customer support and would also like to send a huge thanks to Tony Acker for his knowledge and time spent keeping this X5 running so strong. Stronger, in fact, than the day he first got it, many years and many miles ago. So does a bad start have to equal a bad finish to a relationship? In this case, most definitely not.
Below: Massive Brembo brake conversion features eight-pot callipers and huge 380mm/15-inch brake discs so it stops as well as it goes.
Jay’s X5 may appear as if it came this way from the factory, but the finer details tell all to this rare beast.
Dinan supercharger conversion is rare but was fitted on the car when it had covered just 2000 miles from new. It’s since covered another 133,000 miles!
The supercharged M62B46 responded as you would expect and Jay was instantly hooked.