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In Reply to: RE: Now this is a swap, posted by Michael Samra on April 11, 2017 at 14:39:28
...that I watched all 13 episodes. That's quite an amazing piece of work and workmanship.
I'd like to know two things, though - total budget (obviously he has sponsors), and how he gets away with no catalytic converters in the exhaust. Or have those gone the way of the dinosaur?
You can buy a new LS crate motor pretty reasonable.I get a special deal thru the school being GM funds a lot of our automotive program along with Ford and now Honda has recently come on board.
What they do to eliminate the catalytic converters is to move the O2 sensor that resides after the Catalytic Converter and move it by tapping either into the bypass pipe or the pipe coming out of the exhaust manifold and reinstalling the O2 sensor.
Some use a bypass resistor just to trick the ECM,but this is stupid because that only tricks the system into thinking it's in closed loop status and you need varying voltage coming from the O2 sensors as the ECM adjusts your air/fuel ratio according to what it sees from the six inputs,the 02 sensor being very important.Your gas mileage will drop and the engine can run too rich or too lean.The computer and sensors work to maintain a 14.7 to 1 air/fuel ratio.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Thanks for the explanation. I saw where he installed the O2 sensor in the 11th video (I think), but it begs another question - if the function of the catalytic converter can be so easily duplicated simply by moving the sensor, why don't the manufacturers do the same thing? Those converters are damned expensive. I used to work in the scrap industry, and even as scrap they're valuable because of the precious metals used in their manufacture. I'm guessing that moving the sensor will allow the engine to run properly, but you probably couldn't license the car in California, and perhaps other states as well. I noticed that he lives near Knoxville, Tennessee, and they do have a testing program in place, at least in some areas. I was just wondering how he was able to satisfy the state.
Catalytic converters are not duplicated by moving an O2 sensor. You are correct that Mitch's' Miata would not pass a California emissions test, and certainly fails 'letter of the law' anywhere else. The first O2 sensors are for fuel metering and the second O2 sensor downstream of the cats is for monitoring cat performance and lighting the check engine light if a fault is detected.
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