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Optimization of the 911 Carrera (Cat)

BY INCREASING COMPRESSION

A complete solution with a new CAT

Optimization Carrera 3.2 (CAT)

The 3.2 Carrera was launched in 1984 with 231 hp and without a catalytic converter, only to be later developed into the 218 hp cat engine in several country-specific versions by 1986. Unfortunately, at that time, Super Plus fuel was not widely available, which meant the engine’s development had to be adjusted for lower compression. This engine runs very smoothly, and its objective performance is only marginally worse than that of the version without a catalytic converter, but subjectively, the engine somehow lacks a bit of zest for life.

Can this zest be restored to the cat version? A former 231 hp engine, which was tuned for catalytic converter operation and fuel with lower octane resistance via a modified control unit, can be revitalized with a modern catalytic converter, a renewed modification of the control unit, and the use of SuperPlus fuel.

True enjoyment through conversion

We have critically examined the conversion of the 218 hp version. Does it make sense? The question of sense is particularly difficult to answer with old cars, which is why you are welcome to drive our ’87 Targa in comparison to your 218 hp Carrera. It won’t become a true racer with it either, but it’s only now that it’s really fun for us. From 4000 rpm, the engine comes alive with a growling undertone it simply didn’t have before…

A complete solution with a new CAT

What all needs to be done for this? The compression must be increased, and the engine control unit must be adapted; a catalytic converter with better flow completes the package.

Increasing compression means new pistons and new cylinders; at least currently, these components are still readily available in OEM quality. We equip the original control unit with a new E-PROM that has been programmed for us.

Sensible? In the course of an upcoming engine overhaul, one could indeed say: Yes!