Porsche Repair: engine swap, lambda sensor, optimum ratio

Question
do I need to install the lambda control to have a  3.0L motor run correctly the motor is going into a 1974 911 can I remove the frequency valve

Answer
Hi Bill,

If you are talking about the lambda "sensor", which is mounted in the exhaust pipe(s) and measures the air to fuel mixture almost as soon as it leaves the exhaust manifold, then the answer is don't remove it.

The computer system that runs the car's fuel injection gets its most important of all information from the Lambda (or O2) sensor.  Since the computer knows the optimum ratio of unburnt fuel to air and the sensor tells it what the current reading is real-time, the computer can change the airflow available to mix with the gas in order to get to that optimum point...with the objective, of course, to have no unburnt fuel.  And all this is accounted for by the computer as it also senses how hard your foot is pressing on the accelerator at any given moment...amazing!

For those of us who have moved from carbureted cars to fuel injected cars kicking and screaming all the way...we have finally learned how swell a job the computer can do...and in your swap it'll be dandy too, as long as the lambda sensor is there and functioning properly.

As for the frequency valve...I'm sorry, but I don't recognize that term...so if there's a chance there's another way to describe it or it might have another name, let me know and I'll try to help you.

Dave