Hi Yvan - I've had a lot of requests - guess I should do a proper posting somewhere about it. Here's the reply I gave to a fellow brickster. Let me know if you want further info.
good to hear from you. Currently, I don't have a web site, but I have been writing a series of articles about it for the Australian Volvo Club magazine. There's been enough interest that I need to consider putting it all together in a pdf format and making it available when people ask about it. I'll put your name on the list of folks who want more info and when I get around to it I'll send you the full story.

In the mean time, I'll just give you a brief description of the project and attach a couple pics.

The car is a 1988 240GL with B230F engine and 5-speed manual trans. I bought the supercharger used. It came from a Japanese domestic market Toyota with a 2-litre in-line six engine. The superchargers are relatively cheap here in Australia because many companies import Japanese wrecks and "half cuts" (front of the car only, to avoid import duties so they can sell it as parts) to feed the large market of people who hot up Japanese cars here. The supercharger itself is a roots-type, with an electromagnetic clutch on the front just like an A/C compressor so you can switch it on (for power) and off (for economy).

I fitted the supercharger in the location of the existing A/C compressor, and moved the A/C compressor up high where the current P/S pump is. The PS pump is now relocated on the opposite side of the engine. I made up all the brackets myself out of heavy-gauge aluminium, and had the pulley for the front crank made up by a friend of a friend at work. All the plumbing for the intake was made up from various bits and pieces from Saab & Volvo turbo cars.

The boost level is only about 3.5 psi, but this is adequate with the high-compression of the engine (9.5:1). Any higher boost would require water injection or an intercooler. My biggest problem was getting extra fuel into the engine. For this, I used a Vortech rising rate fuel pressure regulator, which increases fuel pressure by a 10:1 ratio with boost. This is adequate for all but the highest RPM/Boost, which I plan to take care of by adding another injector that kicks in under those circumstances.

The power isn't like that of a turbo. I'd say it's more like a V6, as the torque at low RPM is great, but it runs out of breath at high RPM where a turbo is making all its power. It's great around town compared to a turbo, due to the low-RPM torque.

That's it in a nutshell. I'll attach a couple pics to a second e-mail.

Regards,

Greg