The Stillen unit, from what i can tell, uses what would be better considered a flat flange plate that sits on top of the bottom portion of the intake manifold. The Stillen blower itself sits on top of that plate which creates the hood clearance problem.

The Dreamworkes integrated unit can be looked at in a different way. Take your stock intake manifold and imagine dropping a roots blower INTO it and NOT on top of it. Of course with the redesign of the integrated intake manifold, there may be questions of volume and air flow characteristics (jesseenglish brought this up earlier) but these become lesser issues under boost versus natural aspiration which would help explain why the Stillen unit flange plate is relatively flat.

 

hmm. interesting..

the only reason why i would think of why stillen placed theirs on top was due to the fact that they tried to distribute the air flow to all banks of the intake manifold. if you just place it into it, air being forced in there would be all over the place..

so you're saying you're replacing the upper and lower intake manifold collectors (aka plenum and the lower piece of the plenum) of the car?? or r u talking about replacing the ENTIRE intake manifold system

 

why stillen put in on top, in my opinion, was not due to any performance design...it was for ease in manufacture. Take an eaton blower place it on a flange plate (that mates with the stock manifold lower) where the pulley lines up and weld it to the flange and you have an easy instant bolt-on kit.

with the 2 banks of cylinders, i don't believe the idea was to dump charge air but to route it.

To tell you the truth, i have no idea what pieces are replaced except for the upper collector. I don't know if the lower collector and collector cover are replaced and how the upper collector is designed to attach to the lower.

 

Is deream work useing a Twin Screw or a Roots type SC?
They look similar from the outside , but the two are "significantly different by design, I won't buy an ancinet Root-type design since they are inefficent as hell and gen lots of heat. Now a Twin screw , is much more efficient (runs cooler and quieter) and would be a far better choice for a modern VQ. A little history, Twin Screws come on MAzda Millenia and Mercedes, Roots come on 2003 Cobras and Nissan Pickups.
So which one is dreamworks useing???

 

Good question! Maybe the answer will give us a real clue of hp gain beyond the compter estimated hp claim.

 

The Cobra guys are swapping out the Eaton roots units for Kenne Bell Whipple blowers and picking up a nice numbers. Moves more air with less heat.

I would hope it's a Whipple vice a Roots type for the money they are asking for the kit. With the Whipple SC looks they could make some very nice numbers and take the lead in the market.

 

According to the Sport Z video, they {STILLEN} originally had a smaller plenum designed that did not require any hood modifications. The guy on the video said that you would, however, have to replace the fuel rails, pump and injectors plus the computer because the air/fuel mixture didn't have enough volume to be properly proportioned - you had to quickly dump lots of fuel into the mix or it would detonate - I say dump but we all know it would be a calibrated mixture. So, they said it created a blower that would be too expensive.

Whipple doesn't make car blowers and it would sit most likely exactly where the STILLEN unit sits. WHipple rides the cusp of engine damage / no engine damage. They're fuel management stand alone computer isn't the greatest communicator with GM motors. I'd be affraid how well it could communicate with such an intricate platform as the 350z/G35 (12 computers?). No fuel = detonations = burnt cylinders = bye bye motors. Quick addendum to above: The STILLEn blower, like the Eaton style blowers are actually referred to as hybrid roots designs.

Kenne Bell units.... while [trying to] stay objective, I would ask around for other people's experiences. Apparently they may have had some issues with damage to engines. They may have fixed things by now. I know they sell direct to us now. They cut off all of their distributors and are selling direct to the public now - no more distributors.

 

Strange, I found this on Whipple's site

Whipple's car site

But my point is a screw type blower is better than the Eaton's root type blower for efficiency. So designing it with a roots is not using the best type of blower to start off with.

 

I found this on the Whipple website when referring to their own blowers:
This lends creedence to BLOWBYU's comment that the Eaton unit is a modified Roots blower and not so different from what Whipple produces...just another manufacturer per se.

This from Eaton's website:

 

A Twin Screw is "not" a modified Roots blower.
The way they operate is very different, except that they are both positive displacement pumps.

A TScrew (Lysholm design) is much more efficent since it squeezes the mixture "length wise " between two screws.

A roots blower ( ancient design) squeezes the air top-down and uses the vane-to-case for compression.

The Whipple and Autorotor brands are similar in operation . But the Autorotor units offered by KenneBell are of a much better quality (precision billet construction). I have a 1.5L unit on my Dodge pickup, it's is built very well and has been reliable for >25k miles. At 8psi and WI (no intercooler) I consider it very safe for the factory internals.

This is the type of unit I would prefer was offered on the dreamworks setup.