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![]() ![]() This means a progressive ramp up in injection timing through the low rpm range so as not to “over torque” the engine. The added timing and pulse width that’s ideal (and needed to make power) on truck’s equipped with stock injectors is way overkill when the injector size has more than doubled.Īs for forged rod engines, 600 to 650-rwhp is the general consensus, as long as spot-on, well-tailored PCM calibrating is behind it. The owner was running a set of 238/100 hybrids, which is fine, but an off-the-shelf programmer was being used for tuning. While they can be made to live in the 500-rwhp range with adequate PCM tuning, this image actually speaks to how important custom tuning is on an engine equipped with bigger injectors. Here you get an idea what happens to 7.3L powdered metal rods at high horsepower. ![]() From there on out, powdered metal units got the nod, meaning most ’01 to ’03 model year engines have them. ![]() However, to run out its stock of forged rods, they were installed once more beginning with serial number 1440713 and going to 1498318. However, powdered metal rods-known to be considerably weaker-began to make their way into production on late ’00 build date engines (starting with serial number 1425747). If you own a ’94.5 to ’99 7.3L Power Stroke, you’re in the clear, as all of those engines feature forged rods. So when planning of doing a 7.3 Power Stroke horsepower increase, there were two types of rods offered in the 7.3L, forged steel and powdered metal, which makes all the difference in the world when it comes to how far you should attempt to push things. Forged rods utilize studs to secure the cap, while powdered metal units use bolts. forged steel 7.3L connecting rod lies in the rod bolts. “I get asked all the time how my forged rod 7.3L is still together, but people forget that I did (eventually) bend the number 8 rod in the original engine, so anything can happen.” -Matt Maier of Irate Diesel Performance A telltale sign you’re looking at a powdered metal vs. Thanks to hybrid injectors, more refined tuning, and better turbocharger technology, you no longer need a built engine to have a 500-plus hp ’94.5-’03 Ford. Over the last decade, we’ve seen improvements in leaps and bounds in the 7.3L aftermarket. But it’s not nearly as bad as it used to be. When it comes to the 7.3 Power Stroke max hp limit, it’s the rods, and the weakest rods found in a Power Stroke engine, we have to start with the first mill offered: the 7.3L. Stay tuned for installments on the horsepower limits of Duramax and Cummins mills in the months ahead… 7.3L Power Stroke: So, for the purpose of this article, we’re basing our estimates off of what we’ve seen over the years throughout the diesel industry, and when (as a general rule of thumb) you can consider yourself near the breaking point. But then, 100-percent stock engines let loose for no apparent reason once in a great while, too. These calibrations can increase economy the trick is staying off the go pedal.ĬALIBRATIONS for 6.Sure, some engines survive higher horsepower just fine. This includes Drive By Wire, Fuel, Shifting, and Torque Converter strategies. ![]() Our tune /map will be more aggressive with downshifting.ĥ Star Tuning will be offering 3 popular tuning choices for the new SD 6.7L diesel.ĥ Star Calibrations will have all the enhancements completed in Engine and Transmission functions. Another small issue in stock form we have found is while decelerating while towing that the 6th, 5th and 4th gears will not command – downshift soon enough to bring RPMs back up thus leaving engine braking a little un-used. Tow/Haul mode = We have noticed that while towing larger heavier loads that while in tow/haul mode 4th, 5th and 6th gears come on a little too early during the up-shift lugging the engine and creating an earlier downshift to follow. We can correct this by moving some shift strategies patterns around in 5th and 6th gears while maintaining good fuel efficiency. NON Tow/Haul mode = We have noticed that while in normal everyday mode that the transmission will move into 6 gear really quickly around town with speeds as low as 30-38 mph this really lugs the engine and when trying to accelerate there is a pretty good delay to either downshift or accelerate. However, there are still some benefits to be had recalibrating some non tow/haul and tow/haul shift strategies so your not constantly locking and unlocking out different gear sets through the use of the manual mode(s). TThe 6 speed transmission that comes standard with the SD 6.7L diesel is a big improvement in driver controls over passed Super Duty’s with the 5 speed and 4 speed transmissions. ![]()
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