there was an article for super street a long time ago....2 years maybe? it was the ultimate extreme challange or some bullshit like that. it was a toyota mr2 that had both....a supercharger and turbocharger. it made a lot of horsepower but it broke down a couple of times for a couple of tests....im to lazy to look into finding the article but maybe someone remebers?

 

Here are a few that I dug up:

http://www.honda-tech.com/zerothread?id=1293497

http://www.honda-tech.com/zerothread?id=788103

 

VW actually uses this setup to power the Golf GT (europe only, of course)

the numbers are nothing short of amazing:
170 peak hp, 177 ft-lbs between 1750-4500RPM out of a 1.4 liter motor, which gets 39 mpg.

google "twincharging" and bunch of articles will pop up

 

FYI, another car to google is the Lancia Delta S4 Rallye (Group B).

It used a roots-style positive displacement supercharger and a conventional exhaust driven turbocharger and competed in the FIA Group B Rallye Championship in the 1986 season.

From idle to 3500rpm or so, the clutch-equipped supercharger pulley was engaged, allowing the blower to hork in about 12 psi of boost by 3000rpm.
By that point, there was enough exhaust volume produced by the relatively small motor (I think it was 1.9 liters) to drive a much larger turbocharger.

By 4000 rpm, the following changes took place:
a) the supercharger pulley clutch disengages, allowing the pulley to free-wheel on the input shaft.
b) a diverter valve opens, allowing the intake charge to bypass the supercharger altogether.

So yes, the system would physically work, but modern turbocharger design makes the concept of twin-charging obsolete and unnecessarily complex.

 

i would imagine that if you were to run the charge piping from the turbo into a cold air intake that runs to the supercharger... but then again.... if the turbo is limited to boost... it is stuck there.... doesn't make sense... how can u run 5lbs on an s/c and then go 18 with the turbo.... how does 18lbs get past the supercharger w/o breaking it....

:dunno: just confused i guess

edit: by the time i posted dave answered it... at least for that car... none of these guys talked about some sort of clutch system ?

 

From what I've read, the Delta S4 used an electromagnetic clutch at the hub of the supercharger drive pulley. When the magnet was energized, a locking mechanism keyed into the face of the pulley and locked to the hub on the supercharger driveshaft.

I should also point out that the intake charge was drawn through the turbo first, then the supercharger. And when the supercharger disengaged, the bypass tubing lead through an air-to air intercooler.

Give me a minute, let me see what pics I can find. This car was an incredible accomplishment in its day.



UPDATE: The car was mid-engined, all-wheel drive. The rear half of the hatchback body was designed to lift off to reveal the entire motor, transmission and rear differential. Granted, things were a bit crowded back there..


This is looking down on the rear end, with the firewall at the top of the picture frame.. If you see the two enormous blue-and-red AN coupling, look down and to the left. that's the top of the 1.7 motor. It took a titanic amount of hardware, but the car was recorded by the FIA as producing 510 hp and "over 500 lb-ft of torque".



And below the left-hand intercooler core, you can clearly see the turbocharger.

If this doesn't convince you to drop the idea of twin-charging a DC*, nothing will.

 

This is too much for me. Saw them links Schmoo posted and those engine bays looked fucking packed. That can't last too long. It just doesn't look natural...

 

That would be crazy, but I can see how it might work. A supercharger is belt driven and works into the intake correct? And a turbo works off of exhaust gases correct? So, you can have a supercharger on the top of your engine while you have the turbo where the exhaust is. Super air flowing in and turbo air flowing out. Crazy.

I heard from some kid that you can get a twin turbo setup for your integra. A bigger turbo fed from a smaller turbo... I don't think they exist. But I have heard ppl talking about them...and think it would be stupid and pointless. If the turbos arent the same size, its not truly a Twin

 

I've heard of the twin turbo set-up and I actually saw pictures of one somewhere on the internet. Forgot where exactly the hp was like between 250-275. Not impressive at all for what you would expect from a TT setup. IMO maybe scientfically too...a TT works better on a setup on motors w/2 heads instead of one.

 

I was going to go this route on my 03 Cobra because I didn't want to buy a new manifold

The efficiency would be about 57% where most turbos and superchargers are at about 71%. It would work but require methanol injection to cool the charge temps a little better.