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  • 2008 Ford F-250 Diesel Power Challenge Competitor Tim Jahn

2008 Ford F-250 Diesel Power Challenge Competitor Tim Jahn

’08 Ford F-250, 6.4L Power Stroke V-8

KJ Jones
Jul 17, 2017
Photographers: TK
Tim Jahn, a 12-year diesel mechanic by trade, tells us that although he has been into trucks since his toddler years, his interest in diesel didn’t start until 2003. That’s when he graduated from high school and enrolled in a 2-year technical college (Madison Area Technical College, in Madison, Wisconsin) and completed its diesel technology program.
“While I had a passion for lifted trucks and bigger tires, I learned through owning gas-powered trucks with those accessories that lost power and poor fuel economy are their downfalls,” Tim says. “It was time for a diesel, so I bought an ’06 Ford F-250 with a 6.0L Power Stroke engine. I owned that truck for 8 years, then I traded it in for my current ’08 F-250 in February 2014 (I wanted a common-rail 6.4L engine).”
Photo 2/13   |   2008 Ford F250 Tim Jahn Power Stroke
After installing a custom ECM tune and pushing the truck hard enough to compromise the 6.4L’s head gaskets, Tim’s initial plan to simply replace the gaskets and add a few minor top-end parts to improve reliability “quickly snowballed into taking a perfectly fine engine and stripping it down to a bare block for a full rebuild, which included a balanced rotating assembly with Carrillo rods, bigger turbochargers, big injectors, a billet transmission, and a Dana 80 rear axle,” Tim says.
“I was really never able to consider myself having a shot at competing in DPC until I bought and started building my ’08 F-250 and making power with its 6.4L. I was in the voting pool in 2016, but I didn’t get in the show. However, I was asked to be a member of local friend Travis Koller’s crew that year. Being at DPC 2016 was everything and more than I anticipated! It was then that I knew I had to apply again, and by sheer luck and thanks to voters, I was voted in.”
Tim didn’t build his truck specifically for DPC, but he thinks it’ll still be a stout contender, since he knows his truck inside and out.
Photo 3/13   |   2008 Ford F250 Tim Jahn Interior Dash
“I built the engine and transmission, did all the turbo piping and suspension fabrication, and more,” Tim says. “The truck has won a few local dyno competitions, and it’s by no means a trailer queen. It’s driven to the track and to sled pulls and it hauls broken trucks back to the shop for repair. It even gets used for dropping my kids off at school, taking me to work, and for occasional family trips.”

Build Sheet

Name: Tim Jahn
City: Jackson, Wisconsin
Vehicle: ’08 Ford F-250
Driver Experience: Drag race, sled pull, dyno, full-time mechanic
Engine: 6.4L Power Stroke, balanced rotating assembly with Carrillo connecting rods, cut and coated International HD pistons from River City Diesel, ARP main studs, Colt Stage 2 camshaft, upgraded valvesprings and pushrods, O-ringed cylinder heads, A-1 Technology H-11 head studs
Turbo(s): 66mm billet variable-geometry prepared by Elite Diesel Performance, 94mm Precision Turbo Pro Mod ball-bearing unit, Tial 44mm wastegates, custom-fabricated piping
Fuel: River City Diesel 150-percent-over Extrude-Honed and balanced injectors, Dr. Diesel Twin K16 high-pressure fuel pump, Fuelab Velocity 200-gph lift pump
Electronics: H&S Motorsports Blackmaxx programmer and tuning
Injectables: Nitrous Express progressive two-stage nitrous-oxide system
Intake/Exhaust: Ported intake manifold, custom 6-inch aluminum cold-air intake, Alradco intercooler, BD Diesel Performance exhaust manifolds, MBRP 4-inch tubing
Transmission: TCS billet components; Raybestos clutches; 2,200-rpm-stall, 13-inch, quad-disc torque converter; Elite Diesel Performance billet flexplate
Suspension: King 3.0-inch coilovers (front/rear), Rize Industries 7-inch lift kit (front), custom three-link (rear)
Tires/Wheels: 37x13.5x22 Fuel Mud Gripper, 22x10 Fuel Maverick
Differentials: 4.30 gears (front/rear), stock Dana 60 front axle with Yukon Gear & Axle locker, custom-built Dana 80 rear axle with Detroit Truetrac, Branik Motorsports 300M axleshafts, custom-machined spindles, internally sleeved axle tubes
Fluids: Amsoil

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