Benefits:

Replaces the DOHC 16 valve with the DOHC 20 valve head. Expect a whopping specific power output from this one!

Mods Required:

The 20 valver will bolt atop of the blown bottom end without drama and the static CR will remain about the same since the variation in CRs comes about by using 'turbo' spec cast pistons. Incidentally, the conrods in the 20 Valve are much skinnier than the ZE's. Unfortunately, the 20 valve's quad throttle body induction can't easily be retained, however, the great factory extractors fitted to the 20 valve can stay.

Problems making the variable cam timing operate under supercharged conditions mean the system has beendisconnected in the engines we've seen, as there is too much valve advance under boost. A programmable EFI computer must be used to control fuel and ignition requirements of the new hybrid engine.

Unlike a turbo, the supercharger unit has a self contained oil supply which negates the need for oil feed and return pipes. A problem DIYers have experienced is connecting the complex water cooling system, but perseverance will eventually prevail - or alternatively contact Tony Rigoli.The approximate cost of this conversion is A$10,000 on a drive-in, drive-out basis. This includes the purchase of complete 4A-E and 4A-GZE engines and the fitment of Microtech Digi 2 injection.

Contact:
Tony Rigoli Performance
Sydney, Australia
+61 2 9726 6662