[oldman]

Originally Posted by GuywithL86

Imo supercharger is likely actually safe on the motor for a DD. Forced induction only adds torque. NA power adds power through torque and rpm.

You can gain hp by increasing torque and/or increasing rpm, gaining hp through torque is always easier for the engine then increasing rpm..



So it depends what your intent is. If a daily driver and you don't intend on long periods of repeated WOT, a supercharger is likely easier on the motor. Take it on a race track though, or even texas mile events, and it's more than likely you'll be able to do a lot more of those on an NA build.

That's not discussing the transmission and drivetrain though, torque is their enemy where as hp through rpm is no problem at all. Not much of an issue with the 8l90 though until you are making big power.

Agree on drivetrain. On engine, it would be my opinion that the slight increase in fuel cut say from 6600 to 6800 and how much time a DD will actually be in that range. VS a supercharger always turning and most time adding a little boost... I think the nod to which can go 100K, 150K and 200K would favor reasonable NA.

I feel all modern engines have thin rings and high ring lands for smog and MPG, this make for a weak piston. The failure mode on a LT1 is piston, either through wear via miles or destruction via boost. I'm decidedly on the side that reasonable NA is FAR more dependable vs boost on a 11.4 CR engine. Also the chamber pressure / torque does cause more side load between the piston and bore leading to more wear.

Likewise a upgrade to LT4 type pistons for supercharger vs stronger rods for NA would yield roughly the same dependability.... but we know how that goes, the boost guys would turn up the boost and the NA guys would drop in a bigger can and go above 7000 RPM... My last car was a supercharged challenger, I own a supercharged 2015 Civic SI.