Originally Posted by MRAMG1

Hey there:

You do realize that we are JOKING about the magents

They DO NOTHING my friend.

I have No idea about the P cars closed loop system, so maybe others will chime in, but magnets are a bad joke my friend. Save your money!

See yeah

Originally Posted by lkfoster

Closed loop operation has nothing to do with whether an engine is supercharged/turbocharged or naturally aspirated. Closed loop operation means that an oxygen sensor controls the amount of fuel injected to yield a perfect chemical mixture of fuel and air. This is necessary in order for catalytic converters to reduce HC, CO and NOx. Too much or too little fuel and only one or two get reduced.

This works well at moderate loads, but not at wide open throttle. At WOT the mixture needs more fuel than air in order to avoid overheating important engine parts. So at some point when you stick your foot in it the engine controller decides to ignore the oxygen sensor and go to open loop operation using a pre-programmed map. The 95%+ bit is my guess as to how often you use WOT in day to day use. It's probably more like 80% in my wife's case.

As for the P-car fuel cooler, as I read the posts it sounds like they use it on the return line also. You don't want the gasoline getting too hot, as it cause vapor lock and evaporative control problems. There's a lot of heat coming from the engine, as well as energy from the fuel pump that's running a lot of gas around in a circle.