Adding the H2008 module improved...
Adding the H2008 module improved mileage more than 20% over the last two months. This makes Dr. Performance's module even more attractive to the average mileage seeker, especially with the 6.4L's bad-mileage wrap.
Losing the factory warranty makes a lot of truck owners out there cringe when they consider modifying their diesel. However, they also tend to cringe when they glance at the mileage their new, emissions equipment-laced rig is getting. But, life can still be enjoyed, mileage can still be increased, and additional power can still be made without having to classify your new $50,000 truck as an "off-road" vehicle.
Aside from its innovative work on a 13-second 6.7L Dodge Ram, Dr. Performance has hopped on the DPF-friendly bandwagon for the 6.4L Power Stroke. We recently took an '08 Super Duty to D.C. Performance's dyno with two of Dr. Performance's power modules. The first module we tested was its early 6.4L model (PN 42008), which had increased our Super Duty's mileage from 15 mpg to as high as 18.8 mpg. Then, we plugged in its newest module (PN 42008HO), and compared the two.
 When the Dr. Performance crew...  When the Dr. Performance crew heard we were going to dyno their H2008 module, they overnighted us this H2008HO model to compare the two. This newer module was created to increase performance over the earlier one. |  After our initial runs with...  After our initial runs with our stock '08 Super Duty, we located the circular 15-pin injector electrical connector that our H2008 module would hook up to. This connector is located on the passenger side, under the air intake tube that runs to the first turbo, and is plugged into the end of the valve cover. We removed it by pressing the plastic tabs on both sides, and pulled up. |  While unplugging the injector...  While unplugging the injector electrical connector was easy, it was a pretty tight fit to get both hands in under the air intake tube to hook up the module, so we loosened the clamp for a little more wiggle room. |
 Physically, the H2008 and...  Physically, the H2008 and H2008HO modules were identical. Each had a wiring harness consisting of a 15-pin (male) connector and a 15-hole (female) connector. The 15-pin connector simply plugs in where the stock unit did, and the stock unit plugs into the 15-hole connector. |  We connected the other end...  We connected the other end of the wiring harness to the module by squeezing the plastic tabs and pushing it on. The next step would've been to find a safe place to mount the module, but since we were going to swap it out after a few dyno runs, we set it on its side next to the passenger-side headlight. When mounting the module, always be sure it is in a safe location where it won't be subjected to heat or moisture. |  Getting accurate dyno numbers...  Getting accurate dyno numbers from a diesel truck can be difficult, to say the least. Common performance-hindering factors include the automatic transmission downshifting too much, the truck's computer trying to de-rate the truck's power, or having trouble loading it. We fought the latter scenario at D.C. Performance's dyno recently, as our Super Duty wasn't under load until Fifth gear. This wasn't a problem until we realized our top-speed governor wouldn't let us get past 2,650 rpm on the rollers. Surprisingly, the addition of the Dr. Performance module made great gains over stock, even without getting to our 6.4L Power Stroke's peak rpm range. |