Vote Now Or Forever Hold Your Peace. Super Or Turbo

[noshun]

OK I HAD TO DO IT!

PLEASE CAST YOUR VOTE FOR WHICH YOU PREFER AND WE WILL GET THIS OVER ONCE AND FOR ALL. YOU CAN POST AN EXPLANATION IF YOU WANT, I'LL LET YOU.

FOR ME I'D SAY TURBO. IT'S ALOT MORE TUNABEL THAN A SUPERCHAGER AND YOU DON'T HAVE TO CHANGE A PULLEY FOR BOOST. ALTHOUGH I DO LOVE THE WHINE OF A SUPERCHARGER. EVERYBODY KNOWS 93 R/T STEALTH TT'S ANSWER!!!!

IF YOU ARE A NEWBIE AND DON'T KNOW THE DIFFERENCE AND HAVE THE COURAGE TO ASK....

[Classicrocjunkie]

I my self will say turbo charger. I love t3h giggle juice and cannot run it on a supercharger. At least the ones made by GM.... vrooooooomm.....pssss.. gotta love BOV's..

[-Jayson-]

Originally Posted by Classicrocjunkie

I my self will say turbo charger. I love t3h giggle juice and cannot run it on a supercharger. At least the ones made by GM.... vrooooooomm.....pssss.. gotta love BOV's..

pssstttt GM doesnt make superchargers, they borrow them from Eaton. And you can run dry shots through them. And wet shot direct port. Im supercharger all the way, i couldnt be happier with the results and reliability i have gotten from my supercharger. Nothing compares to whine of a supercharger at 6,000 RPMS. And newer superchargers are now being built with wastage gates so you can control the PSI just as easily as a turbo. Not to mention a roots supercharger is just as efficient as a turbo, but doesnt require all the pipping, oil lines, cooling down time, intercoolers, more frequent oil changes, ect.

[noshun]

Originally Posted by -Jayson-

pssstttt GM doesnt make superchargers, they borrow them from Eaton. And you can run dry shots through them. And wet shot direct port. Im supercharger all the way, i couldnt be happier with the results and reliability i have gotten from my supercharger. Nothing compares to whine of a supercharger at 6,000 RPMS. And newer superchargers are now being built with wastage gates so you can control the PSI just as easily as a turbo. Not to mention a roots supercharger is just as efficient as a turbo, but doesnt require all the pipping, oil lines, cooling down time, intercoolers, more frequent oil changes, ect.

The Eaton Roots style supercharger has a built in Vaccuum plate that works in unison with the throttle to bypass the blower. But even if you can regulate boost. most supercharger applications cannot make as much boost as a turbo. It is a close one for me but I think that I 'JUST' prefer Turbos!

[-Jayson-]

ummm what do you mean cant make as much boost? The eaton M62 blower that is being used on the Redlines and Cobalt SS's, makes 12.6PSI on its stock pulley.

[noshun]

Originally Posted by -Jayson-

ummm what do you mean cant make as much boost? The eaton M62 blower that is being used on the Redlines and Cobalt SS's, makes 12.6PSI on its stock pulley.

I'm saying that you can only lower the boost and that a t3/t4 hybrid can hit about 25 psi!
T28 30 I think. But i'm sure R/T will correct me!

[-Jayson-]

how do you know you can only lower the boost? The boost is going to be electronically controlled, you most likely will be able to increase the boost. If not you just add a new pulley that makes say 15 PSI, thats alot of PSI to play with. ANd anways even if you could make 25 PSI of boost, that would be the least of your worries. Not many people run 25 PSI of boost on a 4 banger or any street car. Who cares if it makes that much boost, you cant use it.

[noshun]

Originally Posted by -Jayson-

how do you know you can only lower the boost? The boost is going to be electronically controlled, you most likely will be able to increase the boost. If not you just add a new pulley that makes say 15 PSI, thats alot of PSI to play with. ANd anways even if you could make 25 PSI of boost, that would be the least of your worries. Not many people run 25 PSI of boost on a 4 banger or any street car. Who cares if it makes that much boost, you cant use it.

The only way to 'up' an sc's boost is to change the pulley. It's driven by the pulley and that how it makes boost and the speed it spins is a direct result of engine speed and the s/c's pulley. An s'c that makes 12psi peak with a boost controller will still only make 12 psi max, all the controller will allow is lessend levels of boost!! If you make say 10 psi with you current pulley and want 20 psi the circumference will have to be halved. You can use the equations below.

original pulley= p, it's Diam= d, it's circum = c
new pulley = P, diam = D. circum = C

for p, c=3.142d

for P, C=3.142D

C=2c therefore

C= 2(3.142d)

C/2 = 3.142d

d = (C/2)/3.142

and C = 3.142D

so d =(3.142D/2)/3.142

d/3.142= 3.142D/2

2(d/3.142) = 3.142D

and so

D= 2(d/3.142)/3.142

3.142 is pi the T thing with 2 stalks



so if the orig diam for 10 psi was say 3" then the diam of the pulley for 20 psi would have to be

D = 2(3/3.142)/3.142

D= 2(0.955)/3.142

D= 1.91/3.142

D= 0.6" or 6 tenths! So would have to be damn small!!

[-Jayson-]

duh, but who says that the charger on its stock pulley only makes 12.6PSI of boost. Maybe GM just limited it to 12.6PSI of boost. Ever think of that? AND NEW SUPERCHARGERS ARE BUILT WITH WASTAGES! How do you know GM doesnt set the wastage to 12.6PSI? It has a wastage for reason. If all the charger could make was 12.6PSI of boost, why would they put a wastage on it?

[noshun]

Originally Posted by -Jayson-

duh, but who says that the charger on its stock pulley only makes 12.6PSI of boost. Maybe GM just limited it to 12.6PSI of boost. Ever think of that? AND NEW SUPERCHARGERS ARE BUILT WITH WASTAGES! How do you know GM doesnt set the wastage to 12.6PSI? It has a wastage for reason. If all the charger could make was 12.6PSI of boost, why would they put a wastage on it?

It's an Eaton M62. They don't make much more then that by design!!

Also the likelyhood of GM putting in an electrical device to lower the boost is extremely unlikely as they would not put something that would cost mare in the car, they would work with Eaton to see what level of boost they want and then go from there and make the correct sized pulley.

Also those equations need to used for the running surface of the pulley that the belt runs on not the outer flange!

This is the Eaton website

http://www.automotive.eaton.com/prod...erchargers.asp

absolutely no mention of a wastegate. Anyhow a wastegate is part of a turbo that allows exhaust gasses to by pass the turbo to limit the boost. A boost controller changes the signal to the wastegate and stop it from opening as soon. You can also change the Actuator to highten the boost. The only way the boost is controlled on the Eaton SC is though the Vaccuum valve which just cuts the sc out completely!

[-Jayson-]

that website is out dated. If you look at their stats, the Eaton M62 blower should only be making around 5-7 PSI at 65000 RPMS, thats not the case. The Ion redline with the Eaton M62 blower makes 12.6 PSI and revs to something like 6500 RPMS. I wouldnt use that website as a judge anyways, it shows very very little technical data about the superchargers.

[4dr92cavi4cyl]

here's my view on the two..

Everyone knows Superchargers run off the pulleys, so they are limited by the speed of the engine.

And of course everyone knows Turbos run off the exhaust gas pressure, so they are limited by the speed of the air leaving the motor.

Think about this. Engine speed is linear, meaning from 1rpm to 10,000rpm, speed is consistent. Air speed is different, say you have 2.2 liters of displacement, it takes 2.2 liters of air/fuel to fill the cylinders, but when that air/fuel is ignited and released into the manifold it becomes something like four times that amount (not sure, not a scientist but you can imagine how much it expands)

There is alot more room for speed with a turbo.

[-Jayson-]

if turbos are so great, how come top fuel dragsters dont use them?

[godenm]

jayson,how many psi of boost are you pushing through yur s.c. to run into the 14's??

[Mangoamerican]

both are nice... but id have to say supercharger because its using wasted energy