Overall: The 6.0L PSD is different, so you might want to clarify that this article is only for the 7.3L PSD. In this forum, that's clear. But if Shawn adds it to the '99-up FAQ, it needs to be clarified.
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The automatic transmission will be hurt by transmission fluid temperatures over xyz.
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Somewhat controversial, but if you want to assure a long life for your 4R100 automatic tranny, here's my take:
Any tranny temp less than 200 is good. 200 to around 225 or 230 is the "pay attention" zone, and indicates you might want to switch to synthetic ATF and/or add more tranny cooling capacity. 225 or 230 is the red line.
Some say you can go as high as 248 for a short time. But anything over 230 would worry the heck out of me.
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In order to monitor the temperatures of your transmission, you need an accurate transmission gauge. Ford wants 3500 dollars to rebuild your transmission, so the gauge is a cheap investment.
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The 2002 and later Superduty PSDs have a so-called tranny temp gauge in the dash. It's a glorified idiot light, so ignore it and install an aftermarket tranny temp gauge. For 7.3L PSDs, install the sender in the pressure port on the side of the tranny, or else weld a threaded bung into the side of the tranny pan.
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Fixes for excessive heat include backing out of the throttle, shifting down earlier, computer programming changes, valve bodies, and rebuilds from reputable shops.
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Fixes for frequent excessive heat in the tranny is a bigger tranny cooler or even a tranny cooler with a big fan to pull lots of air through the cooler at low-speed conditions.
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If this device detects over 25 psi, it will defuel the engine, and throw a code, causing your Service Engine light to come on.
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25 is the red line, but the SES light, defueling, and code setting happens at 27 PSI.
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There are devices to fool the MAP available.
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But they are a terrible idea if you have a stock turbo. 25 is the red line on a stock turbo of a 7.3L PSD. More than that and you are gambling with a lit stick of dynamite or Russian roulette.
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As a general rule of thumb 100 horsepower or less will be safely under 25 psi of boost.
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No. Depending on intake and exhaust, almost any increase in power can produce over 25 PSI. With a good intake and exhaust, you can get about 21 PSI without any chip or programmer installed.
