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2006 SRT8 Dodge Charger- Vortech SRT8 Supercharger KitAdd 116 Hp To Your 6.1l Hemi In One Weekend. From the August, 2008 issue of Popular Hot Rodding By Kenny Wayne Shepherd Photography by Johnny Hunkins
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Do you want to add over 100 hp to your 6.1L Hemi with a box of parts, some average mechanical skills, and about eight hours of your time? Now that I have your attention, check out what Vortech can do for your SRT8 Mopar. I happen to have a 2006 SRT8 Charger, and I wanted it to go faster. I wanted the most horsepower and torque I could get for the money, and I like the idea of installing it myself in my garage with basic tools. Like most of you, I'm not a mechanic, so I imagine a lot of you reading this have had those thoughts go through your mind at least a few times. If you know me, you know I'm a musician who loves guitars and cars. I like to wrench on my stuff anytime my schedule permits. FYI, I've written plenty of songs, but I have never written an editorial before. When presented the opportunity to install a blower on my SRT8 Dodge Charger and write about my experience doing it for Popular Hot Rodding magazine, I jumped at the chance. You see, I'm a Mopar guy. I own both new and old ones. As of writing this article, I own five Mopars and am working on acquiring my sixth (the new Dodge Challenger SRT8). I really love my SRT8, and everything was fine until I went to the quarter-mile track for the first time. Trust me, this car has more than enough power from the factory for most people, but if you've ever been bitten by the drag racing bug, you know what I'm talking about. My first time at the track, I ran the car to a best of 13.00 at 108 mph with a couple of Mopar Performance bolt-ons (exhaust and cold air intake) into a 35-mph headwind. That's pretty darned good, but now I need more, because at the strip, it's all about going faster, and that 13-oh barrier is begging to be broken. I started thinking about the options that would meet my criteria, and decided on a supercharger. Supercharging an engine is nothing new. It's a proven method of boosting horsepower that's been done for years in all kinds of automotive applications. Supercharging an engine is pretty simple in theory. Force as much cool, dense air as possible (with the right amount of fuel!) into the engine, and create more cylinder pressure and power. It's like increasing the displacement, but you don't have to do a thing to the engine. When looking for a supercharger for my 6.1L, I wanted to go with a company that had a history of supercharging cars with good results. That's when I came across Vortech's kit for the new-generation Hemi. It's just what I was looking for: a company that's been doing this for a long time. Its technicians are top-notch, and this is a system it developed in-house, not a mix-and-match group of parts that someone pieced together in their backyard. This is a brand-new unit that uses a centrifugal supercharger, which is ideal for cars that have a limited amount of space to work with inside the engine bay. The Hemi kit includes an intercooler to help cool the air charge as it is force-fed into the engine. All the large components are made of aluminum to keep the weight and temperatures down. It also includes larger injectors and a Boost-A-Pump for increased fuel delivery. You can buy one right now, and the typical street price is $4,900 for a satin finish, or $5,200 for a polished one like this. Vortech is awaiting CARB approval, so for now it's for off-road use only, but once the California Air Resources Board exemption order is issued, it will be 50-state legal, and you can get the necessary documentation for your Hemi kit sent to you from Vortech. Let's get down to the nitty gritty. You want to know how much power this thing makes. When I first drove my car to Vortech, we did a baseline run on its Mustang dyno. The dyno showed my car putting 283 hp and 286 lb-ft of torque to the rear wheels. Don't be shocked by those numbers because I previously had the car on a Dynojet dyno and it posted 400 hp and 402 lb-ft. Those numbers, incidentally, were produced with a Mopar Performance cold air induction kit and a Mopar Performance exhaust-both of which I installed myself. Seems like quite a discrepancy, but the Mustang dyno has a reputation for being more conservative with its numbers, and what's really important in the overall scheme of things is the amount of horsepower gained. Now that I had a base number for reference, I could install my kit. As I opened the box, I noticed just how complete this thing is. No runs to the auto parts store for any missing pieces. No need to have my car's computer tuned after installing the supercharger. Vortech supplies a Diablosport Predator handheld tuner with a preprogrammed tune for this application. Just plug it into your car's OBD-II port, and in about 10 minutes you're ready to go. After everything was done and buttoned up, the guys at Vortech did another run on the Mustang dyno. I must say, the proof's in the puddin'. (Hey, maybe there's a lyric in there somewhere!) The new peak numbers are 395 hp and 384 lb-ft; that's a net gain of 116 hp and 104 lb-ft at a very conservative pump-gas-friendly 4.6 pounds of boost. This setup is very streetable, and at the same time allows me to smoke the rear wheels all the way through Third gear should I feel the urge. So far I've only been through one tank of gas since the install, but I haven't noticed any drop in mileage. That's impressive, considering I can't seem to keep my foot out of this thing! I also haven't made it back to the track yet, but I'll be going down that quarter-mile as soon as my touring schedule permits to get you guys an updated quarter-mile timeslip. The quality of workmanship in this kit is great, and the parts are notably lightweight. It took the better part of a day to install the system on my car, but I had a little help from Ricky Best at Vortech. If you're on your own, give yourself a weekend to get the job done. There's not a lot that needs to be removed from thecar prior to installation, and the instructions are clear, but if you want a little extra guidance, you can follow along as I show you the high points on installing the Vortech supercharger on my SRT8.  Here is a picture of the entire...  Here is a picture of the entire Vortech SRT8 kit, minus the Kenne Bell Boost-A-Pump. Everything you need is included, except the simple tools used during the installation. As seen here, this kit runs around $5,200 street price (polished).  Mounting the heat exchanger...  Mounting the heat exchanger requires the front bumper to come off. I would start my installation here because it's relatively easy to remove the nose of a Chrysler LX platform car. I've done it many times, and it takes about 25 minutes. If it's your first time, expect it to take twice as long. Find a good location to mount the heat exchanger using the accompanying straps to hold it into place. When you're done, run the wires, coolant hoses, and hose clamps.  Mock up the coolant tank bracket...  Mock up the coolant tank bracket against the framerail. Make a couple of pilot holes with a 5/32-inch drill bit. Assemble the transfer pump, reservoir, and brackets, then mount it with the provided screws. Then you can button the front end back up, or wait until you're done with the entire install.  The Kenne Bell Boost-A-Pump...  The Kenne Bell Boost-A-Pump was the tool of choice for the Vortech engineers because it handily sidesteps the need to swap the factory pump for a larger one. The Boost-A-Pump triggers additional voltage to the stock fuel pump once manifold pressure reaches 5 psi; however, the SRT8 kit maxes out just under that, and that's why Vortech modifies the Hobbs pressure sensor to come on at just 2.5 psi. We mounted the control unit under the seat, and wired it per the Kenne Bell instructions.  To accommodate the extra power...  To accommodate the extra power at the necessary air/fuel ratio, you must install larger fuel injectors and a boost kit for the fuel pump. For the injectors, just remove the bolts that secure the clamps to the fuel rails, and lift the rails up. Swap in the new injectors and replace the fuel rails. While you're at this stage, you also want to remove all the factory intake ducting, remove the serpentine belt (note the routing), and unbolt your power steering pump to make way for the blower assembly.  Here I am having my picture...  Here I am having my picture taken as I assemble the blower bracket hardware. It's always nice doing something while a group of people are standing around watching you, especially when one of those people is wielding a camera. (Get over it. You should be used to that by now.-Ed.) The bracket assembly is essentially two solid billet aluminum plates and one steel plate separated by seven aluminum dowel spacers. The cogged belt transfer shaft mounts in the main plate. It's lucky for you that Vortech plans to preassemble this entire thing for you, so you can proceed to the next step.  When you pull the preassembled...  When you pull the preassembled bracket assembly out of the box, this is what it should look like. Vortech also plans to have the blower head already bolted on, and the cogged belt already connected to the pulley transfer shaft.  Lower the bracket assembly...  Lower the bracket assembly into the engine bay, and tighten the bracket bolts to the engine. As I mentioned, Vortech says it'll ship this with the blower attached, so your install may be a little different.  There are four bolts that...  There are four bolts that protrude from the bracket into the engine. Use a half-inch ratchet to cinch these down. These are real easy to access, as you can see here. Now's also the time to reattach your power steering pump.  Attach the idler pulley with...  Attach the idler pulley with a 9/16-inch wrench. This must be done after mounting the bracket because it covers some of the bolts needed to attach the bracket to the cylinder head.  ow you can mount the blower...  ow you can mount the blower to the assembly-or loosen the blower to attach the air filter if your blower already came attached to the bracket. When doing this step, you must hold the air filter in its intended position and then carefully massage the filter onto the blower as you move the blower into position. This is necessary because of the limited amount of space in this area of the engine bay.  Then tighten the blower down...  Then tighten the blower down on the bracket with the six supplied 9/16-inch bolts.  Slide the cog belt into position....  Slide the cog belt into position. Use a 3/4-inch box wrench to tighten the idler and put tension on the cog beltdrive.  Now install Vortech's longer...  Now install Vortech's longer six-rib serpentine belt, following your notes from when you removed the stock one. If you're like me, and the good ol' short-term memory isn't good enough, Vortech provides instructions for this step.  Now onto the intercooler,...  Now onto the intercooler, which is the key to building big power with this kit. Preassemble the coolant hoses (one going in, one going out) before installation. Then you can place the cooler into position, and run those hoses to the transfer pump and reservoir.  Connect the aluminum duct...  Connect the aluminum duct tubing from the blower to the cooler assembly, and then tighten the clamps provided with a 5/16-inch nut driver.  Finally, install the aluminum...  Finally, install the aluminum tubing from the cooler to the intake manifold using a 5/16-inch driver to tighten the clamps.  This is what it should look...  This is what it should look like when you're all done, and the fat lady, err, supercharger sings. When you open the hood, there won't be any doubt that you're packin' some serious horsepower.  Simply plug in the Diablosport...  Simply plug in the Diablosport Predator handheld tuner to the OBD-II port under the dash, and in less than 10 minutes your car is programmed for a conservative 4.6 pounds of boost, and all the right ignition and fueling for your 6.1L Hemi. No further tweaking required.  On the Mustang Dyno we got...  On the Mustang Dyno we got the official numbers: The Vortech kit pumped up the output by an additional 116 hp and 104 lb-ft to the rear wheels. Time to invest in some sticky rubber! (And how about swapping out those pimp daddy wheels while you're at it?-Ed.)
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