Posted by Determined on October 15, 2020 at 12:59:33 from (216.130.212.201):
In Reply to: Anyone have a GM 8.1? posted by Hockeygoon on October 14, 2020 at 19:39:08:
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Well to start with the 5.3 in your chart makes 376 HP at 5600 RPM.
My stock 8.1 is making over 300 HP at 2000 RPM.
The 5.3 at 2000 RPM is making 130 HP
Torque the 5.3 is making 383 lb ft at 4100 RPM
At 2000 RPM it is listed as 325 lb ft.
My 8.1 is making over 400 lb ft at 2000 RPM
If I need to drop a gear I am making 440 lb ft at a still useable 3200 RPM.
No idea who drives with the engine screaming at 4000-5600 RPM.
The 8.1 makes useable HP and torque in the RPM range it will be driven.
If you tried to achieve the theoretical numbers given for the 5.3 and actually drove at those RPM's I can guarantee you will be using more fuel than my 8.1 for the short life of the engine if constantly run at that speed.
If all you ever haul is groceries then by all means go with the 5.3 but if you tow a lot of heavy loads the 8.1 is legendary.
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