Because boost on S C has to do with rpm. Example for SC: 3000 rpm=2psi= low torque #, 6000 rpm = max boost say 6 psi then the torque peaks.

Example for turbo: 3000= 7 psi, peak torque and mostly holds that torque up to 6000 rpm. From the time SC is waiting to make comparable torque, turbo is 3-4 car lengths ahead .
Does this example help?

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ANyone get it?

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The psi/torque on a SC increases as rpms increase. on a TC the boost/torque starts high and doesnt stop....

I think I got it
thanks for explaining

Basically correct.

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Also, since a supercharger is run off the crankshaft via the engine belts, it takes HP to turn it. That's not a big deal on already strong V8's but on a 120hp 4-banger, that ~20 HP(estimating) loss due to drag makes a really big difference.

Just as an exmaple, I have read that is takes something like 500hp just to turn the supercharger on those top fuel funny cars.

Wow. Everyone gets it. You get a prize too!

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Here is related thread

https://www.evolutionm.net/forums/sh...d.php?t=189736


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Memo from Mods - Cross-posting = no no........