Mark Gearhart
May 11, 2016
Photos By: Kenny Duttweiler

If you’re reading this and you don’t know the name Kenny Duttweiler, stop. Go search his name online. Go ahead, we’ll wait. Wow, right? If there is one aspect of vehicle building that Duttweiler knows better than anything else it is how to make big power on small-cubic-inch motors with boost. He is the only guy on the planet who could figure out how to make 500 hp from a Briggs & Stratton by just strapping a set of twin turbos to it. Well, maybe not that much.

Kenny’s car

Duttweiler’s personal car is right in his wheelhouse, a small-cubic-inch V-8 motor with boost. You guessed it, a 2015 Mustang GT equipped with Ford Performance supercharger system. In stock form the 2.3L Twin Vortices Series (TVS) supercharger pumps out a respectable 670 hp at the crank with an 85mm pulley. But when you are talking about a guy who builds 2,000hp engines all day, 670 hp is like feeding a petite filet mignon to a bear.

“I intentionally bought a stick-shift Mustang because Ford Performance said that they weren’t going to offer a supercharger calibration for the automatics, and I knew I wanted their kit on my car,” says Duttweiler.

His 2015 is his daily driver, so he needed to figure out a power level that would keep him happy when his right foot got heavy but would also stay reliable. Duttweiler says, “It has about 12,000 miles on it so far. This car doesn't sit; I use it all the time.”

To make all the magic happen Duttweiler enlisted the help of Matt Snow of Snow Performance, Joey Granatelli of Granatelli Motorsports, and Chris Johnson of JMS Automotive Products.

“I purchased my Mustang about two weeks before the SEMA show in 2014,” remembers Duttweiler. “It had been on the lot for about a day. It wasn’t even dealer-prepped yet. I saw it on a Sunday afternoon and immediately traded in my 2012 Mustang for it. About a month later Ford Performance released the supercharger. I got one of the first kits along with the half-shafts and the Ford Performance exhaust system. Then I ran into Chris Johnson from JMS at the PRI Show a month later and ended up with the JMS parts that I needed for this project.”

Hot for meth

In terms of methanol injection, Duttweiler is already very familiar with them. He says, “I’ve known Matt Snow at Snow Performance for about 10 years now and as soon as he knew that I was planning to supercharge my Mustang, he wanted to be apart of it. I don’t endorse products very often, but this stuff just flat-out works.”

Duttweiler notes that he doesn't run a blend of water and methanol but relies on straight methanol to do the job. Snow Performance hooked him up with a Stage 3 Boost Cooler Kit (PN 310).

“On the dyno we had one fan pointed at the intercooler and the other at the radiator,” says Duttweiler. “When we started our chassis dyno tests at Granatelli Motorsports we never shut the car off. The separation between pulls was only about two or three minutes. This really showed us how well the methanol injection works.”

Supercharging your fuel pump

The factory fuel pump in the 2011-plus Mustangs is actually a pretty good unit. It works by varying the voltage to the pump to increase the pump’s duty cycle as you begin to smash the loud pedal. JMS’ PowerMAX (PN P2000PPM15) acts like an amplifier for your fuel pump, but instead of pushing two 12s, it is increasing the power handling capability of your stock fuel system. We can say for certain that it’s good for over 700 hp to the wheels.

01. Kenny Duttweiler isn’t one for being in front of the camera. He prefers to be behind the scenes building engines or on the dyno. Don’t let his stock-appearing S550 fool you though. It makes over 700 hp to the tires!

02. There is no doubt that the Ford Performance supercharger system with an 80mm pulley wants to make more power and is being held back by the dyno-recorded 6,600-rpm rev limiter. While it still makes an impressive 721 hp to the rear wheels at 6,600 rpm and 591 lb-ft of torque at 5,000 rpm, we feel like power should be closer to 750 hp if the engine could rev to around 7,200 rpm. Duttweiler noted that the 80mm pulley is good for about 2 more psi over the larger 85mm variant.

03. Here you can see exactly how well the Snow Performance Stage III water/methanol kit is working. Duttweiler and Joey Granatelli have made multiple runs with a variety of engine configurations but this one shows where all the magic is happening. All Coyote engines have the ability to add timing until they detect knock. Duttweiler noted up to an additional 3 degrees of timing increase while logging the dyno runs. The decrease in charge temperatures along with the increase in octane netted an increase of 29 hp and 13 lb-ft of torque. “We saw 9.8 psi of boost with the methanol activated but 9.4 with it off,” says Duttweiler. “The air density change with the methanol increased boost almost half a pound.”

04. “When we first dynoed the car I had the methanol set to come on full at 3 psi,” says Duttweiler, “but that actually hurt the power because it was adding too much too fast. I then changed the setting where it starts spraying at 3 psi and fully in at 7 psi, and that really cleaned up the bottom end.”

05. Duttweiler originally started out running two nozzles for his Snow Performance system and realized he didn’t need that much meth; a single 625cc nozzle performed the duty. “We didn’t even need to upgrade the fuel injectors,” he says. “I tried to put bigger injectors in it, but the computer wouldn't adapt to the fuel flow. Ford Performance has done a good job keeping people locked out of their tune, so I couldn’t make any changes to the injector data. Believe it or not, the air-fuel ratio with the methanol injection was 11.8:1 and it was similar without it as well.”

06. The all-business engine bay is as simple as it gets. A factory-fresh Ford Performance supercharger system is all you can see, while the water/methanol tank and pump are hidden behind the bumper on the driver’s side.

07. The tank that Aced Auto Worx makes for the S550 is a true bolt-in kit, which is perfect for the DIY crowd. “It has a remote fill under the hood,” explains Aron Cranford of Aced Auto Worx. “The stainless tank holds 1.5 gallons and uses a central aluminum plate to mount the tank and pump to the body of the car.”

08. At one point in time you had to tighten a blower’s serpentine belt so tight there was a risk of snapping the snout of the crank clean off. Worry no more. JMS has teamed up with Griptec to offer a medley of blower coatings. We have seen this stuff under a microscope. The coating looks like a cross between a pumice stone and magic. It creates ungodly amounts of belt traction without the need to replace belts in between oil changes. The idler pulley is also coated to keep the belt from walking on the normally slippery surface.

09. Also from JMS is the company’s version of a fuel pump voltage booster called PowerMAX. There are multiple ways to trigger the voltage increase (hobbs switch, boost reference line, and so on), but the easiest way is by using JMS’ plug-and-play system, which is offered for 2011-2014 and 2015 Mustangs. The PowerMAX can nearly double (a user-selectable 18.5 to 22 volts) the voltage going to your fuel pump by utilizing the factory fuel pump control method, which JMS claims can supply up to an 85 percent increase in fuel delivery.

10. Duttweiler cruises with the GT500 dual 62mm throttle-body around town but used the Ford Performance dual 65mm throttle-body for these tests. “This throttle-body flows so well it was actually good for 0.8 psi of boost over the 62mm version,” he says.

11. “The car was just too damn quiet,” says Duttweiler with a chuckle, talking about the Ford Performance exhaust system on his S550. He notes that this system is good for 15-20 hp; his choice was the M-5200-M8TC Touring cat-back system.

12. Ford Performance’s axle kit is an immediate upgrade for anyone who plans to drag race their Mustang—even if it is stock! Duttweiler is no exception for when he’s dumping the clutch on his MT-82 backed S550.

13. We warned you. If you see this S550 on the street or track, be ready for a Duttweiler-style whoopin’ to get handed to you.