why do you guy's like a turbo vs a centrif Supcharger?

turbodart68 said
Your 10 hp figure is a joke right? The Hp to turn a blower is based on the same principle you state later in your post. The hp required to turn a supercharger is based on how much boost its making. According to Procharger a F3R on a motor I built at 24 psi is taking 100 hp ( and a top fuel motor takes 1000hp at 40 pounds of boost) to turn. That is the reason for a 3 inch cog tooth belt. If it took 10 hp you would be able to use a v belt and a small one at that.

yes and no, but rmostly no, no joke. A centrifcal unit uses a V belt. Sorry, I thought that was the charger we were talking about. And yes, I understand that the more power your making, the more power loss there will be in turning the charger.

How many guys here running 24 psi on the street? Come on now, hands up!!!

A turbo does create back pressure, thats true. However a turbo motor works on pressure differential. Lets say a N/A motor has 2 psi pressure in the exhaust while , lets say for the sake of another arguement, the intake has 0 psi. So a turbo motor on 22 pounds of boost has 5 pounds of back pressure in the header you still have a 17 pound pressure difference. Hence the general consensus that turbos are "free" HP. I honestly can say that turbo power is free

I busted up the quote to stop you right there. Your math states otherwise against free power.

because engines create heat and in creating this heat is how hp is made and a turbo takes advantage of the expanding gases to create even more wheel speed in the turbo. Not to mention when the turbo is up to speed since it is allowed to accelerate past the speed at which the exhaust is flowing it can actually have a scavenging effect.

The speed of the impella is moving faster than the exhaust gas is pushing it though it takes exhaust gas to move it?
Sorry, the only time I see this happening is under deceleration.
I do notsee expandinggasses being a huge or little factor in movingthe impella faster than the gasses themselfs turning the impeller.

Centrifugal superchargers are friggin awesome as well as a turbo motor. Both make big power, both are not easy power, there is always a certain amount of pain and suffering to make big power.

As is allways the case, LOL, yep, very true. Pressure ethier way is good.

Check it out, I recommend the book "maximum boost" by Corky Bell for some light reading to support what i just wrote.

OK. (I just don't beileve everything I read.)

turboJoe said
turboJoe said

I don't know what any of this imaginary equipment is or what it does,

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Hey Joe!

Imagine a turbo or centrical super charger on a stand next to the engine being dyno'd. This unit is not hooked up to the engine, but was unsed prior to dyno the engine for the base line power graph. The unit being used. It has a seperate power surply to operate, but yet it is surplying the engine with boost. This will compare the engine under boost without the engine turning the supercharger or pushing exhaust gas to turn the turbo.

Take these results and compare. Then you'll see the loss between the two units and the units themselfs.

Turbos still only use wasted energy to operate,

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Otherwise wasted energy. I ot that.

off of boost zero backpressure period.

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Sorry, missed this one.

I am so tired of trying to explain this to you and you don't seem to want to understand no matter how many times or how many people try to help you. No hard feelings but I give up sorry dude but you hurt my head.

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It's not wanting to understand, I just do not beileve a turbo is an actual "FREE" HP maker.

Ittakes power, some sort of power to turn the turbo. It doesn't magicaly spin by itself. Since the exhaust gasses spin the turbo, (which otherwise would have been wasted) it takes a certain amount of pressure to spin the impeller. This pressure is now creating back pressure. Power loss!

And of course, no hard feelings. Sending you some Advil and a cool drink ... ;)

Just dont think I'm anti turbo!