Guys, I am not sure if this is where this question belongs but as I have an FD this is where I am asking. Is it possible to use a supercharger and turbocharger in tandem? Does anyone know of any cars (rotary or piston) that have this type of setup. My thinking is the supercharger adds low boost at low revs and the turbo kicks in after 3500+ rpms. I imagine both would have to run low psi and as they would act in tandem at the higher revs the engine would have to be pretty bulletproof and not too high compression. For some reason I have always been interested in this and any thoughts would be appreciated. I am not in any position to mod any of my cars (FD, rx8 and wrx wagon) this way, but a project someday could be interesting. How about this on an classic american v8. Thanks for your serious treatment of this question. I hope.

 

There have been a number of talks about this and I beleive Volvo is already using a desgin similair to what you speak. Also their is a design of a hybrid turbo/supercharger in one. The already compressed supercharged air would be further compressed by a turbo meaning you would get like 40 psi! Its insane do some searches on the web and you will find some interesting sh*t. BTW I dont think their is enough space in the FD Engine Compart to do such a setup.
Just my Opinion*

 

The way that I have scene this done is when a supercharger is used to get quicker response and spool up out of a very large turbo. I have not scene this on an FD because of under hood space issues. This set up takes a lot of plumbing and room.

 

Search the net for compound forced induction. Very hard and $$$$ to do. I don't know of any rotaries doing it. I've seen a couple of integras/civics and such. One of those import/hooker magazines has done a story about it before.

 

that would make 1 hell of a drag car, having the sc spool up until the giant turbo kicked on, once it was alive, have the sc cut off, so the boost and compression would not be to high, sounds like it would work, but lots of cash!! lots of cash.

 

I know HKS did that setup on a Silvia in Japan about 2 or 3 years ago with incredible hp results. But then again that was a huge company with limitless budget room too. You should be able to find an article or two on it if you search through google. I saw it at a show a couple of years back and saw it make a couple of passes on the 1/4 mile. It sounded NASTY!! I would have to agree with the rest about the lack of room under the hood of an FD though. An FC might be more likely of a subject.

Zach

 

Thanks gentlemen, I am nearly retarded when it comes to the technical and I appreciate the advice on where to go when it comes to research. If I thought of doing this to a rotary, I would probably start with an FB and get an Atkins Rotary engine and go from there. But truthfully I had thought of importing a 70's vintage Aussie Ford Falcon or a Mercury Cougar Eliminator (I think that is the Cougar model I like) and taking my time. I like the idea of having something very different and very interesting.

 

Lancia has (or had) a 2.0 litre super-turbocharged engine that made 600 hp.

 

The problem for a street car would be heat. When air is compressed it gets super hot....then when you further compress compressed air its asking for trouble. There is a lot of info on this subject, do a search on google for turbo tracter pull setups. They run as many as 4 turbo in series. One thing to consider is which ever is which ever is in line first and sucking in the ambient air has to be huge cause it has to supply enough air for itself AND the supercharger (or turbo depending on which you do first).

Also, depending on which s/c you get they dont really make that great of low end boost. A blower makes low end boost BUT it falls off at the rpms climb. There is a s/cer called a whipple that makes good low end boost (it hits full boost at around 2500rpms). The only problem with a whipple is I think you'r be over spinning it at 8000rpms unless you used a real low psi pulley....but whats the fun in that? haha

Oh yea, most setups designed like this are ran on alcohol due to the extreme heat.

STEPHEN

 

if memory serves me right, i belive the meguairs teg had a HKS compound system, that was orginally made for an MR-2(spyder). also a company called http://www.koenig-specials.com/ makes compound forced induction for F50's

 

I don't see how that would work, with both screw type or centrifugal SCs. Both are driven by the crank pulley, thus they would be active all the time, unless you had some type of clutch in the SC pulley. Even with that, it would impose a restriction in flow once it would be inactive...or that's how I would see it.

 

Useless on a drag car anyway, since they can get a "giant" turbo spooled up on the start line.

 

the only supercharger i could think of that could do this is the mercedes benz version that is activated by magnents or something like that , that doesn't boost at idle.