2011 Ford Project 6.7L Power Stroke

Part 3: Emissions Systems Deleted, 181 lb-ft Added

Mike McGlothlinMay 1, 2011
The time has come to get more aggressive with our ’11 Super Duty’s performance. So far, we’ve added power to the 6.7L Power Stroke while retaining the diesel particulate filter (DPF), selective catalytic reduction (SCR), and exhaust gas recirculation (EGR) systems. Now, we’re removing all three in order to pave the way for more performance. After getting our hands on one of H&S Performance’s Black Maxx tuners over the winter, we conducted some street and dyno testing.
Photo 2/9   |   With the H&S Black Maxx tuner set on the hottest position, the factory ball-bearing Garrett turbo now makes 32 psi of boost on the street. On the rollers at Randall’s Performance & Accessory, we were only able to squeak 30 psi out of the truck on its SuperFlow load-cell dyno.
With a freer-flowing exhaust thrown into the mix, an uncorrupted intake tract, and more rear wheel horsepower, we’re formulating our next power-adding attack. Stay tuned, because in the following months the horsepower level will only be climbing.
On the dyno, the Super Duty laid down 875 lb-ft at just 1,900 rpm, and torque didn’t fall below 800 lb-ft at the wheels until 2,700 rpm (which explains why the truck pulls so hard on the street). Our horsepower curve shows a different story, however. Notice the dip in our power curve at 2,800 rpm? This is because rail pressure dropped from 29,000 psi to 22,800 psi and recovered once the truck pulled through the load the dyno had placed on it. According to H&S, the drop in rail pressure we saw may not occur on every truck. In addition, H&S has stated that some tuning changes should prevent this problem from occurring on any trucks in the future. *All results are shown using the Society of Automotive Engineer’s (SAE) correction factor. All dyno pulls were made in Fifth gear, and with traction control off. All tests started at 52 mph and ended at 95 mph.
Photo 3/9

2015 Ford F-350 Specifications

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Fair Market Price $30,909
MSRP $32,705
Editors' Overall Rating
Mileage N/A City / N/A Highway
Engine 6.2L V8
Horse Power 385 hp @ 5,500 rpm
Torque 405 ft lb of torque @ 4,500 rpm
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Sources

Nitto Tire
Cypress, CA 90630
877-565-8448
www.nittotire.com
H&S Performance
St. George, UT 84790
888-628-1730
www.hsperformance.com
MHT Luxury Wheels
Garden Grove, CA 92841
800-493-7891
www.mhtwheels.com
Randall's Performance and Accessory
Gladstone, IL 61437
309-627-2500
http://www.randallsperf.com
Stree Diesel Performance
860-250-6082

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2015 Ford F 350

Fair Market Price
$30,909
Editors' Overall Rating
Basic Specifications
MSRP: $32,705
Mileage: N/A
Engine: 6.2L V8
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