Depends on what compression the engine is built with?
18:1 can take 20-25 psi with air charge cooling of some kind and performance tune.
21:1 (stock) is limited to 15 psi and that should also be combined with intercooler/water injection and performance ECM tune.
My shop truck has a DB-2 pump with the fuel screw turned as far as it will go and a non waste gated turbo. It sees 25 lbs of boost quite often. Havent had any problems with the engine in the 2 yrs since it was built.
After practically splitting a 6.5 in half running big boost on it i built a new one with the billit steel splayed main caps and line bored it. Cut the new pistons down to 16 to 1 and had calico do they're coating on the skirts. I used a massive oil cooler and my own deigned ata cooler. I would be sure to say that its duty cycle is near 100% as i can run it flat footed seemingly all day at 25lbs of boost
Thats with Kennedys biggest chip. With the pmd mounted on a big heat sync and the engine mounted fuel filter deleted in place of a under truck mounted Davco.
The air intake turned as to uncover the injection pump, all that just gets way to hot. A 150k later it still runs great but it has broke the inout shaft off of 2 4L80 transmissions. The 3rd one i am going to try a billit steel shaft and if that one breaks i am parking it for good.
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