thanks for all the info guys

 

Blown,

What's up with the HYBRID??? Is it a new design or just new marketing???

 

That is a sticky in the Forced Induction forum written by TurboBerserker for this site.

 

Well I love my Procharger, with about a 3000 stall they are pretty bad. When they start pulling they pull like a bat out of hell.

 

The standard roots blowers use 2 two lobe rotors and a top inlet, bottom discharge. Radix hybrid roots use 2 three lobe rotors with a 60 degree helix (twist), and a front inlet, rear discharge. This creates better adiabatic efficiency and 25% better volumetric efficiency...

 

The only centrifugal I see as being able to compare with a Radix would be a D1SC Procharger. It is capable of much higher CFM and when you go with smaller pulleys, the boost comes on sooner. I have a Vortech with a 2.87 and a 3K precision industries converter and I see 5# immediately when I floor it from a stop.
That being said, you will need more mods for the procharger to keep up with a Radix. For on the street racing, a Radix will be hard to beat provided they get traction with all that instant power.
For my new setup Im going with the STS GT67 to start. Turbos dont have the parasitic drag of blowers, they are able to make more power, however it isnt a 6 hr and youre on the road job like the Radix. All hail the mighty turbo

 

 

We know that already, that's what is meant by the term *modified* roots. But a new term, *hybrid* had been added here, which has not been used before. Now "hybrid" generally means a combination of two different things, like a hybrid car is a combination of a gasoline and an electric. So my question here is: What constitutes the hybrid? I presume one part is the roots blower, modified as described above. But what is the other part?

 

I'm running a ProCharger P-1SC with a 12# pulley and a 3-core FMIC. I see 7 psi as soon as I floor it so lag is certainly not an issue. As far as track results it doesn't take much looking too see most of the top NMRA guys are using big ProChargers, Paxtons, and Vortecs if not a turbo. Having full boost off idle is great as long as you have the traction and the drivetrain to handle it. With the cent. it's easier to launch off the line and it pulls harder to redline. Don't loose traction as much on the shift either as boost will drop a little. I think a P-1SC-1 or -2 would be more comparable to a Radix than a D-1SC mainly because of the hybrid impellers. Have a radial/helical hybrid that maintains the broader power curve at lower rpms and a 3,500 rpm kick in the butt.

 

I picked up this info:

This graph appeared in "Battle of the Boost", Hot Rod Magazine in the August 2003 issue. Turbo systems are the clear choice if you are looking to generate usable horsepower between 2500 and 5000 rpm.

"Given equivalent vehicles, the turbo would easily motor away from the centrifugal in an acceleration contest......The turbo offered massive midrange torque production, the only system to exceed 600 lb-ft. Need more convincing? At 4,000 rpm, the turbo was more than 100 lb-ft. stronger than either the Roots or centrifugal." Richard Holdener, "Battle of the Boost"