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[Chance]

Originally Posted by davidspixx

On my Vegas, the tachometer shows no red line, nor does the manual. The reason I ask is that the transmission in cruise control going up a hill will shift way down, making the engine rev at more than 4500 RPM and screams. What RPM should I avoid??
The engine is a 6.8L V10 305HP in an 2015 Ford E350 gas.

I have the same engine, just older, and I personally avoid high RPMs whenever possible.

Maximum power of 305 HP is rated at 4,250 RPM, and maximum torque of 420 lb-ft at 3,250 RPM, so from my perspective what would I gain from revving near red line? I'm not in that big a hurry that I can't slow down a little and maybe get the transmission to shift up one gear in the process, thereby lowering RPMs that much more.

At maximum torque speed of 3,250 RPM the engine already makes 260 HP, so it's not like we are squeezing that much more power out of engine above 3,500 to 4,000 RPMs.

Obviously, available transmission ratios can limit engine-power-versus-RPM choices, but in general I keep engine well below 4,000 RPMs.