This set up isn't the other way around.

Look, centrifugal compressors are very one way by design. You really can't 'spool' either by blowing in their inlet.

 

crazy

 

correct, i can boost directly through the supercharger, it does not spin the supercharger faster just gives it more air to breathe. i was out in it today after i did a few small things and the car runs very smooth so far, hopefully will be able to get it to the dyno by saturday if i can get the water injection on in time. by the way jus from driving it so far around town under 4700rpm on 5lbs turbo boost, this thing has a lot of potential.

 

ive continually bashed on this whole idea (another forum and model of car) but the more and more i see of them, it seems its a trend thats gonna work. i guess ill keep watching from the sidelines. its one of those things that you ask yourself... WHY.. then you see it go, and ride in it and go.. WHOA!
and since ive been with big VW for years, and seen alot of neat stuff that never hit the streets, watching them play with the twincharged stuff has been cool. crazy torque curves, and fuel where you wouldnt expect to see it. lol
lates

 

It's nice to see someone think outside the circle and doing something different. I am so keen to see the dyno....and would love to have a ride in it as well but I am on the other side of the world

IMHO I think it will work nicely. The supercharger will help the turbo to bring boost quicker and have more topend than....basically broaden the turbo power band. The only downside is the maintenance. It's hard enough to maintain 1 power adder rather 2 systems now.

Please post the dyno graph

 

I really don't think it will.

Props have to be given for trying something new, but I believe a turbo only setup with a properly sized turbo would be a better option.

 

^now dont forget that i can get boost from the turbo and the supercharger. i can obtain way more boost than jus one turbo.

 

Y not?
The turbo power graph is tested by only exhaust/gas spinning the turbine. In this setup, it is not only being driven by the exhaust but also is sucked by the SC

 

You can't just throw stuff together and expect it to work. Think about this for a second and allow me to explain:

The supercharger is always operating at a speed X time faster than the engine. Given the engine, at a specific supercharger operating speed, it will provide a specific amount of air flow which you can turn into power. Thats pretty simple and all centrifugal compressors work this way. At a certain RPM, they provide a certain amount of air flow depending on how restrictive the up and downstream flow path happens to be.

Even a small frame turbo would easily surpass the supercharger flow rate once it spools to operating speed. The smaller the turbo, the quicker it reaches this point. The larger the turbo, the more exagerated this scenario becomes:

The turbo compressor is pushing a certain amount of air. The supercharger compressor is spinning at a fixed RPM and it WANTS to push a certain amount of air, which happens to be less than what the turbo compressor is currently outputting. In this scenario, the supercharger won't do jack shit but hinder the air flow into the engine and sap power from the engine to turn itself. If the supercharger is operating at a speed that will move more air than the turbo is currently outputting, it WILL compress the air further, but whats the point? It's FAR more efficient to just allow the turbo to move the additional air. Properly sizing the turbo would be a better option.

Again, I must ask why? Did you do it just to do it or did you think it would be "better". If the latter, how did you think it would be better?

 

well i have two boost gauges one right after the turbo and one after the SC. when the turbo is finished spooling and reached its max boost and it holds i look and the other boost gauge and it is making more boost linear to the rpm band. dont really know how to explain this but it is sucking the compressed air, on top of it compressing the air also