Bet that got a little attention but I've been looking into it and yeah its done on some cars, mostly toyotas. I heard mercedes did it too. The P.C. term for it is Twincharging but it really doesn't seem worth it. Check out some pages here I found:

http://www.geocities.com/MotorCity/Lane/1231/index.html

http://f2.autospeed.com/cms/A_0283/a...popularArticle

The second one is an article, look for "Blow me down" as the title. Interesting but looking at the first page and the guy is posting 15second 1/4miles in his twincharged toyota doesn't exactly make me want to run out and buy it. Plus the $6000 price tag....If I won the lotto I'd do it if I wanted to say "I have a supercharger...AND a turbo...AND nitrous...AND another engine in the trunk." Rap "Twincharge" into any search engine and it'll come up with a wealth of info.

Isn't this a lot like compounding systems? Put a bigger turbo (say a T04) to create big boost before a smaller one, that then pumps that into the engine (probably a T03). I read the HOT ROD magazine article (part one) on turbos that i got in the mail, and i've learned A LOT. I'll definetly post more about turbos' and ideas too.

Yeah thats the way most twin turbos work, sequential turbo. One larger than the other so you gradually build up to the big kick, keeps power spread out better. The thing is that the smaller you get trying to combat turbo lag the less boost you get. So sure you can get a turbo to kick in at 2000rpm but you might only get a few psi. Thats where twincharging comes in. But yes, same basic idea just taken a little further.

You can do this to your L67. West Coast Fiero has a nice write up somewhere on an install they were working on. I believe it'* a Series 1.

If anyone is interested I'll track down the link.
*edit*
Okay that was easy
http://www.fiero.nl/forum/Forum1/HTML/027408.html
you may need to cut and paste if it doesn't work at first.

That'* already posted here in another thread. You get the advantages of Low and High end performance that way. Hector and I were talking about this on my car nearly a year ago.

Probably something I'd still consider if my car was a little newer.

Wouldnt the total volumn be controled by the SC in the end anyhow ? Wouldnt it just be pushing against the rotors that can only feed so much anyhow ? and then also get involved with that inefficient heat buildup ? I suppose you would have a denser charge going into the rotors but then what would the rotors do with all that ?

I guess I should read those articals you have links for.

Just seems like puting a propeler behing a jet engine and expecting it to keep up.

Detroit diesels nearly the originitator of "blowers" at least in big production were also available with turbos as well, it was only a 12% gain but a gain none the less.

Thats why you are better of going with one or the other.

Trust me. The theory works. The SC takes what PRESSURE is induced, and increases it. Not totally efficient, but still better than what the Turbo can do on it'* own, and the SC gives the boost off the line before the Turbo can spool.

But for the outcome versus the money spent most people will say that it isnt worth it. But this also falls underneath the application.

Unless you already have the SC......Turbos can be added fairly easily.