Shane.Trammell

please someone tell me exactly how a centrifigul works

Black8

Usually a good matched centrifugal supercharger would have have the same torque curve as before, just amplified. I always wanted to add a centrifugal supercharger to a small high winding engine...I love the powerband, but I always wanted more....Be cool to see one attached to my renesis, one of these days....waaay in the future.....

Authentic

They are RPM relevant, for example a stock crate 700hp HEMI v8 doesn't have enough HP to build 1psi on the monstrous SC on a top fuel car. So if your sc waits until your engine is putting out 140rwhp to get going say...efficiently, and your peak is 200hp, at 2k RPM your boost is pretty shady.



A bigger displacement engine will have the flatter bigger powerband, making power early and holding it to redline, a sc is a perfect counterpart, since the motor already has Torque to spare down low, and it gets it back twice fold as hp on the top end.



Turbos make more torque than any supercharger, and are mid-range specialists in a way, a small engine's downfall is lack of torque, so a turbo is ideal for a race application.



A centrifugal is also good, it just won't make similar power as a turbo PSI for PSI, plus a small motor is already suffering a lack a lower RPMS...Losing even more power to drive the SC.



Also centrifugals like Vortech or procharger ger AFTERcooled. don't ask.



a High winding motor would be interesting, centrifugals like RPMS more than turbos in my oppinion. thats why you have stock internal PUSHROD v8s revving to 7000RPMS, so on a Rotary or DOHC 4 cyl just imagine.



There's a 8.6 second CONVERTIBLE trans am from ls1tech.com, and it's INSANELY loud. it also weighs 3500+ pounds.

Dysfnctnl85

Here is a link from the 3G forums I'm on for Eclipses. It's a good write up on how centrifugal superchargers work.



*Edit* Without a doubt turbochargers are more efficient; however, the undo stress and heat created by the systems make supercharges more effective.

Authentic

are you familiar with uh...BELT SLIP? or TENSIONERS? this is a certified pain in the anus.



The installation is easier, and they are "easier" overall, but no boost controller?



not only efficiency, but a 500hp sc car will get walked by a 500hp Turbo cars all things equal.

Dysfnctnl85

Ah, I also have a video of a centrifugal supercharger on a 3G if you want to hear what it sounds like.



AIM NoLeafClover81

Fluid Dynamics

He he. Bench racing isn't my style, so I'll just leave my comment that I just want 5-7 psi on my 9.4:1 cr wankel with instant throttle response and the same linear power band. We all know that turbo is superior from an efficiency and power standpoint on engines with excessive waste exhaust energy like wankels, but the point of my ponderance is not power or efficiency, it is driving experience.

83turbo

Thank you, Fluid Dynamics. You have restored my faith in the online community. (except rx7club). Though I think the term "evil forum" gives them too much credit. They aren't smart enough to be evil.





I will point out though that if you didn't like the TII, you probably won't like a centrifugal either.

Authentic

The real instant throttle response is a roots/screw type, but like i said before "instant" is up to perspective specially when we're talking rotaries.



as far as driving experience, some people like the prius's so go figure.

Dysfnctnl85

Whoa, I didn't claim to be a SC expert, I've just read a few things about them...



Pulley's are your boost controller. The kit I was referring to does have a bypass valve though.



There are a lot more variables than HP when it comes to comparing the acceleration of two cars.



SC are a better option for some cars than turbos.