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Old 07-23-2007, 11:51 AM   #1
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Question Supercharger torque less than a turbo...why?

If the explanation to this is somewhere, let me know what to type so i can search it.

Anyway, why is it that a supercharger (centrifugal or roots type) cannot be tuned to produce more TQ than HP (or at least close to the HP rating) as a turbo set-up can? I know that the supercharger is limited somewhat to how much air it can push, I guess, but why is the torque rating so much less? For example; If both systems have lets say 280whp, theres a good chance that the turbo will have just as much TQ or more, and the charger will probably have about 210-230ft lbs of TQ maybe, whats up with that? I have nothing against a turbo, and more torque is sooo much better, but the whine of a charger is niiiiiccee...! And they cost a little less usually from what I've seen and read.
And I just curious too........

Well I know there is a bigger motor-head than me out there so if someone could explain this it would be great!!



Last edited by SVTFOOCUS; 07-23-2007 at 01:01 PM. Reason: felt like rambling more...off of work today
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Old 07-23-2007, 12:34 PM   #2
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Hmmm what happen when u turn on your A/C ? U will loose some power...why ? because belt/crank needs to power A/C compressor now....the same with SC...how much rpm SC has ? how much Turbo ? ;-))) check website howstuffworks ;-) and u have tq with SC as well...U just need a BIGGER engine to go with ;_) Look at Cobras/ GT500.... ;-)
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Old 07-23-2007, 01:06 PM   #3
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^^^^ HEHE...thanks, I'll check that out. And I think I'll stick with my Lil Focus...to much fun to drive. And it only 13,000....little better on the pockets.
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Old 07-23-2007, 01:26 PM   #4
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I think it has to do with the fact that a turbo has a waistegate, this allows the turbo to be sized to allow boost/ air volume to come on earlier in the rpms, at higher RPMs the turbo is able to cut back on the air volume using the waistegate. Where as a blower has to be sized/driven to produce lower air volume at the lower RPMs so that at higher rpms the boost will not be too much. You could use a BOV to bleed boost on a supercharger at higher RPMs but this will produce heat and waist HP.
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Old 07-23-2007, 06:54 PM   #5
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Torque is caused by stress on the motor, the amount of torque is directly related to how much air is being compressed in the engine (causing the engine to work harder)

Most superchargers do not create maximum flow until almost redline (since they are belt driven and soley dependant on engine RPM) Where as turbos usually hit peak flow between 3-4k rpms and with all of that air being forced into the cylinders it causes the engine to work harder to compress it.... which gives you torque.
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Old 07-23-2007, 07:37 PM   #6
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:-) Ow hell ya, as i was reading your post John all i was thinking of me in my car and have the turbo spooling up and my back to my seat, and how much better it will be when i get the GT2871r
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Old 07-23-2007, 07:52 PM   #7
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might want to look a lil closer at those graphs turbo vs. sc...in most of my findings turbos genrally make more peak tq. but its at the upper end of the rpm range, this is usually true for centrifugal superchargers as well, on the other hand roots or screw type superchargers make better than 50% of thier torque at lower rpm's. I've seen compressor designs on turbos and centrifugals that can build low rpm tq. but roots and twin screw got it in the bottom end.
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Old 07-24-2007, 04:31 PM   #8
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Depending on what turbo you run determins where you'll see your most TQ and the bigger the turbo the more tq it will continue to hold past your peak.

I hit 250wtq around mid 3k and I hold it to 7.5k with my peak somewhere around 5300..... with my old turbo the tq curve was insane and held strong.
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Old 07-24-2007, 04:44 PM   #9
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Here is an example of what I mean... both of these dyno's are of my SVT with 2 different turbo's


GT2871r...22/23psi and just a splash of race gas (had a little bad gas so I tried to equal it out)



GT3076r 19psi 93 octane... more aggressive tune

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Old 07-24-2007, 08:04 PM   #10
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Quote:
Originally Posted by 03OrangeSVT View Post
Torque is caused by stress on the motor, the amount of torque is directly related to how much air is being compressed in the engine (causing the engine to work harder)

Most superchargers do not create maximum flow until almost redline (since they are belt driven and soley dependant on engine RPM) Where as turbos usually hit peak flow between 3-4k rpms and with all of that air being forced into the cylinders it causes the engine to work harder to compress it.... which gives you torque.
Thanks man, that broke it down for me a little better. At least I understand it somewhat now. So is a SC (even though ran off the engine) could be better for the engine mechanically since it doesn't produce as much stress on the internals?

Last edited by SVTFOOCUS; 07-24-2007 at 09:43 PM.
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