Everyone's seen twin turbo supra's and rx-7's but, has there ever been a twin supercharged car (either from the factory or a project car)? Is it even possible to have two superchargers on ONE engine?

 

Yeah, Jacksons's got a twin supercharged Civic lying around somewhere.

 

there's been a twin supercharged Buick GSX on Popular Hot Rodding Tv

 

No GSX
http://www.buickgsx.net/

 

Lancia made a Group B rallycar with a street version that had BOTH a supercharger and a turbocharger. It is 4wd and weighed about 1900lbs. The supercharger would be used for low rpm boost, then at around 5-6000rpm(redline was 9000rpm) it had a bypass valve that shifted to the turbo good for that extra 30hp. The car started at 450hp but 550 to 600 was possible. 0-60 in 2.8 sec on the dirt

 

Whoa whoa. Jesse = wrong. My whole world is now thrown into turmoil.

 

How in the hell did they program that bypass valve... that seems pretty tricky... too slow, and you've got a definate drop in HP for a split second (an eternity in racing time), too fast and your engine just became a pipe bomb!

 

Hope this works

http://community.webshots.com/rz/r1/...bEXbfEZ_ph.jpg

 

thanks guys

I wasn't considering doing it, I just wanted to see if it had been done. I've read about MR2's with turbo + supercharger setups. What a tuning nightmare!

 

Jesse isn't old enough to remember the Buick GSX, which prior to the GNX, had been the fastest Buick ever made. (The GSX would probably be faster with modern tires, at least until you turned up the boost on the GNX )

Usually, twin superchargers are used for volume, efficiency, and hood clearance issues. There are three ways to get big volume. You could use a single BIG supercharger, which would be efficient, but wouldn't fit under most hoods. Or, you could use a single small supercharger and spin in very fast, but that isn't very efficient. Or, the last option is to use two smaller superchargers and put them next to each other (parallel operation), and they'll fit under a hood. See, easy.

My cousin had a twin supercharged all-aluminum 511 (ex-Can Am motor) '70 Chevy Nova SS back in the mid-70's. It all fit under the factory cowl induction hood. Streetable, probably in excess of 1000 hp and 1200 ft.lbs. On 10" slicks, it ran the 1/4 in the low 9's at 150mph. Or, on cheater slicks, would carry the front wheels across an intersection. Top speed was about 175 mph (according to police radar), limited as much by gearing and aerodynamics (lift) as by power.