Not twin turbo, twin charged – supercharged and turbo charged! I think it’s the VW Polo that’s factory twincharged, and there have been more than a few mini’s that ended up twincharged.
I'd kinda wondered if anybody had tried fitting a jackson racing supercharger kit from a honda or miata to an MR2...
It’s my understanding that centrifugal superchargers were originally designed to be used on engines that spent most of their life in a narrow rpm window. They are popular today on passenger vehicles because of their installation simplicity and the way they add boost - (typical of a properly sized system) Low to mid rpm operation sees minimal boost, meaning fuel economy is not effected much and detonation is easier to keep in check. Keep revving the engine and ideally once VE starts falling off the supercharger really starts adding boost, kind of like VTEC on steroids if you will.
While its not turbo lag, and there is some boost generated in lower rpm ranges, the centrifugal systems I’ve seen provide full boost close to redline. While this can be great for a daily driven car I think it blows for performance on a 4 cylinder. I want my boost to kick in asap, not at 5,000rpm when I’m starting to think about shifting.
My opinion in short: centrifugal superchargers are nothing more than crank driven turbo’s that spool late.
I’ll leave the centrifugal subject alone now. Let us know what form of FI you decide to go with!
Scion Tc - The Great Debate Supercharger Or Turbocharger - Turbo Magazine
Supercharger Overview - Tech - Sport Compact Car Magazine
Centrifugal type supercharger - Wikipedia, the free encyclopedia