motor

coloradosilver · 01-20-2004, 03:18 PM

with a serpentine system, or any blower system, the power is NOT instant. The impeller blades are turning as long as the car is running, yes. But you don't get into any positive boost numbers until you start to climb in the RPM range. I have an 8lb pulley on mine and I'll still be in vacuum at 1,800 RPM. I don't even see +3lbs till I'm close to 2,800 RPM. The smaller the pulley, the quicker you'll get into boost, but it's never immediate.

zevolv · 01-20-2004, 03:21 PM

Well on my cars and my friends GTP the power is instant my car idles at 2000RPM so that mey be a factor but the GTP doesn't have to spool up either, The Camaro has such a large engine and soo much more done to it you would never notice.

coloradosilver · 01-20-2004, 03:25 PM

Idels at 2000!?!?! Damn thats high. Even my high performance car idels no higher than 600. Thats nuts. But I suppose that if you're already at 2000 when you hit the gas you would already have positive boost numbers. But that high idel can't be good for the car.

scubywrxr · 01-20-2004, 03:54 PM

superchargers produce the most horsepower - heard of topfuel dragsters ? 5000-6000 hp instantly

veilsidebr · 01-20-2004, 04:40 PM

I just say one more thing:

For turbochargered engines, use a wastgate valve or pop-off. This will helps you and will give the famous tschhhhhhhhhhhh...

For blower engines, oh, this is really special, don´t forgive to put a Rof scoop on the bonnet. This makes a car nervous.

graywolf624 · 01-20-2004, 04:49 PM

It depends alot on the engine and the car.

blah · 01-20-2004, 04:56 PM

Its been proven that Turbos are always more powerful than a supercharger. Personally i wouldhave a turbo/Supercharger a supercharger to run while the turbo spools, and then shuts down.

graywolf624 · 01-20-2004, 05:01 PM

"Its been proven that Turbos are always more powerful than a supercharger. Personally i wouldhave a turbo/Supercharger a supercharger to run while the turbo spools, and then shuts down."

Not necessarily true.

Some basic advantages to each (limited to my own knowledge):

Turbos are less subject to elevation changes.
Supercharges have less of an issue with placement in regards to heat they create affecting air intake.
Super chargers are not subject to the spool up like turbos are.
Turbos tend to work better with high rpm applications.
superchargers tend to work better with lower rpm applications.
Theoretically turbos are more efficient because they arent driven by the engine. That being said, it isn't that cut and dry in the real world.

The greatest setup is a supercharger turbo in series setup.

graywolf624 · 01-20-2004, 05:32 PM

"with a serpentine system, or any blower system, the power is NOT instant. The impeller blades are turning as long as the car is running, yes. But you don't get into any positive boost numbers until you start to climb in the RPM range. I have an 8lb pulley on mine and I'll still be in vacuum at 1,800 RPM. I don't even see +3lbs till I'm close to 2,800 RPM. The smaller the pulley, the quicker you'll get into boost, but it's never immediate."

Wrong.
Things depend alot on the type of supercharger. During wot or under load your typical roots supercharger(which most of us have experience with) produces the boost regardless of rpms. The reason is that these devices have a fixed air displacement amount. Meanwhile the centrifigul setup which we see less actually depends on rpms. Read here for more info on each. The smaller the pulley the more boost is produced, not the quicker it is produced.

http://www.aerosuperchargers.com/Doc...asics_3.31.pdf

GM in general(and thus Grand prixs by default) use a roots blower.

blah · 01-20-2004, 05:32 PM

Turbochargers wil always make more power. It was proven, read hot rod magazine were they test 2 different blows vs a turbo charger, the turbo charger made over 600 horses, and 600 lbs of torque with the Mustang.

graywolf624 · 01-20-2004, 05:36 PM

"Turbochargers wil always make more power. It was proven, read hot rod magazine were they test 2 different blows vs a turbo charger, the turbo charger made over 600 horses, and 600 lbs of torque with the Mustang."

1 application does not prove it. Did you miss where I said it depends on application? It might work that way for the mustang but that doesn't mean its true always. Yet again theoretically it is but real world it depends on the application.

coloradosilver · 01-20-2004, 05:38 PM

It's so hard to compare that though. They could be different sizes, spool at different rates, be putting out different lbs of boost. If you're talking about efficiency, than a turbo is better becsuse it poses no strain on the engine, but you have to wait for the pressure to cause boost. If you want quicker boost, than a supercharger is your best bet, but it will draw some of the power from your ehning in order to turn the blower.

graywolf624 · 01-20-2004, 05:40 PM

And also.. Peak hsp versus a longer range of power. Which is better?
What setup depends largely on the application in terms of engine as well as what you are trying to achieve.

SFDMALEX · 01-20-2004, 05:42 PM

It does depened on the engine I guess. If your car only revs up to 5000rpm then I dont think you'll get much boost from a turbo. so a blower is this case. If your car can rev up to 8000rpm then the turbo will have enough room to spool up completly and stay like that since you'll not get below 3500rpm....on a track..... Anyway Im not expert, just my own little "theory"

coloradosilver · 01-20-2004, 05:43 PM

I think that a blower will give you a better powerband just because it's blowing linearly with the rotation of the engine. The quicker your engine turns, the more boost it will put out. Turbo cars tend to kinda lose that "pull" in the way-high rpm range. Unless you've got a huge turbo and it's tuned not to kick in until those high RPM, but then you're sacrificing the lower RPM power.