well i am reviving an idea i had from a couple years ago. now that i have a haltech, i feel alot more confident in getting it to run properly. need to get a vortech or ati supercharger, engine brackets, and the belt assembly is all.
the output from the supercharger will just split and feed into the air inlets of the greddy turbos. should only take a day or 2 to do and would be a quite wild setup. really curious on how the powerband would be. run the supercharger at 7 psi and the turbos at 7psi, and on paper the output will be 49psi. should make a little bit o' powa!

looking for someone who maybe has a car with front end damage that just wants to sell these parts. or even a shop who may have some of these parts or all of these parts new or used. don't need any fmu, wiring, piping, intercooler or fuel stuff.

edit- maybe a stillen will be a better set up. just need a stage 1 kit if anyone has one.

 

**EDIT** Ignore my stuff...i misread and thought you were going to spool your turbos off the supercharger air...not drive the air into their intake. My bad. /**EDIT**

i think you are attacking this from the WAY wrong angle. If you want to run supercharger and turbo, i think you'd run boost from both into the intake plenum.

Also, i'm no turbo guru, however, I think that your math is way off. 7 pounds of boost run through the turbos should spool them and everything, but your only boost will be coming from the turbo, which if it spools too fast (which i don't think it will from your supercharger input since that amount of air is either going to push through the engine, or through the turbos, same air...maybe a little more due to less backpressure) but yeah, the only thing you'll do is overspool your turbos or cause your wastegate to bypass the air?


maybe i'm way off?

 

Interesting idea....

 

It depends on how he routes the piping. In a serial setup, you can potentially get 49 lbs of boost if the efficiency of the turbines is high in that range. I doubt he'll get 49 lbs, but i can see 30 lbs happening

 

I believe the NSX guys used to do that. I remeber a few BMW racing team, and some NSX guys doing this

http://en.wikipedia.org/wiki/Twincharger

 

I was actually thinking about something like this on my way to work today. But in my idea it was a stillen S/C being fed by the turbos, so reversed from your idea but still similar.

 

there was a scion tc that did this few months back in import tuner or modified. i dont remember wich one but they went on about it for a while in there.

 

I've seen it done on a Z with a single turbo and a supercharger...
http://www.turbomagazine.com/feature...ged/index.html

but I haven't seen it on a twin setup, Good luck.

 

what kinda S**T you smokin becasue i want some

 

nope, really just your math that is way off, lol. in my example, on paper, the output should be 49psi. 7psi is a compression of atmophere in a 7 to 1 ratio. if you start with 7x's atmosphere instead of 1, and compress it again at a rate of 7to1, well you get the idea. nothing to do with overspooling at all.

 

good point here. my original plan was to use a stillen also. and till i read your post i forgot why, lol. the turbos will have to blow through the supercharger and not the other way around. since the supercharger is a linear boost directly connected to the engine, so that will be the better way to correctly make a reliable system. due to the superchargers linear ratio based on engine rpm, it will be far easier to control boost.

 

I have been thinking about doing this for about a year now but lack of funds to build my engine has kept me from doing so.

The guys at CIN motorsports think it should not be that complicated to run a twin charged setup using my current Stillen blower combined with a rear mount STS turbo kit.

I have my doubts though so instead it might be easier just to run Nitrous instead of a turbo. It would be a very unique setup none the less.

 

i have nitrous also, hahha. never used it yet though and mostly for the looking. i do have an old school 6-71 jimmy blower i have been saving to run on my 67 camaro. the swept area in it is 350ci each revolution, lol. might be abit overkill, not to mention be about equal in height with the roof of the car. i am a little worried about the rotors in the stillen being strong enough though and not bending and hitting under that amount of pressure.

you would have it super easy running an sts set up though.

 

That would be 7 bar, not 7 psi. 7 bar would be atmosphere pressure * 7 (7 to 1 ratio).

7 psi boost is 14.7 (atm) + another 7 = 21.7 psi absolute pressure.

If you had 7 psi of boost through the SC and added another 7 psi, it would be 14 psi on top of atmosphere of 14.7 or 28.7 psi absolute.

How it builds boost will depend on how you set up your wastegate reference pressure source...

EDIT: One pitfall I see with this is that you are feeding the turbo hot air to start with which may lead to inefficiencies that you usually don't need to worry about (small intake piping, etc).

 

I did the math for this once, it's not 49 psi. All the math should be done for absolute pressure. So 7 psi on the supercharger is 21.7 absolute (7+14.7), its about a 1.5:1 ratio (21.7/14.7). Run that through the turbo, with the same psi (7) (same ratio, 1.5:1), it will give you about 32.6 psi (21.7x1.5). Than minus ambient (32.6-14.7), it will give you about the final, 17.9 psi. the numbers are rounded during each step to simplify explanation here.

The true final psi is 17.333-continued.

 

In to see if this happens

 

What seems to be missing in all these calculations is the volumetric mass flow associated with the S/C output driving the turbo. The turbos are typically spun by the product of exhaust gas mass and its velocity. Seems like this set up has worked on other platforms but any discussion on what kind of power it will make needs to consider more than boost level estimates.

 

now that would be sick!!!!!


I have seen a video of a BMW with a SC and single turbo and needless to say it was quite a beast. Cant wait to see how this works out!!

 

Raj, i can say that coming from the maxima community that we never really saw significant temp differences when using the vortech SC system w/o a intercooler. I ran mine for 2 years w/o one. I can't remember the exact #'s but there were several logs done and the temprature was not drastically raised by the SC. Granted it was hotter (duh) but was not detrimental by any means.

 

+1