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Question Muffler/catalytic converter question on a 75 1.8 FI...

Hello Everyone,

I purchsed my 75 1.8 FI from California and it came with all the great Smog stuff. Since I live in BFE New Mexico where there are absolutely no regulations on smog (You should see the smoke coming from cars.. Well I think they are cars...) But... I have been thinking about getting a better heat exchanger muffler combination than the 1975.

My question is simple. There is a device coming out of the catalytic converter with a wire. That wire goes into the rear trunk and into a relay. That relay goes to the harness.

What the heck is this and can it be removed?

If I put in a 1973 Heat exchanger muffler combination it will not have this device or a catalytic converter. I am worried this will hurt my original 1.8 FI L-JET system or engine.

Thanks in advance,
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Christopher A. Landt
rockaria@rockaria.com

1979 911sc
1973 914 2.0
Old 09-23-2002, 12:52 PM
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This wire and relay, I believe, turn on the light in the dashboard that says "CAT" on it. I do not believe that it is wired into the EFI in any way.

If in doubt, trace the wire to see where it goes.

--DD
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Old 09-23-2002, 03:17 PM
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it is a temp sensor for the cat light that indicates the cat is overheating, which means the cat is blocked or mixture too rich. The original EGR/CAT suppliment to the owners manual I have actually recomende 10,000 mile cat replacement. Remove the relay and harness.

If you use heat exchangers from a 70-73 1.7L or 74 1.8L you need the matching muffler and heater pipes (if you want heat). Or you can use a 73-74 2.0L system with the muffler and hanger.

If you remove the air injectoin you need to plug the ports into the heads or you will have a horrible exhuast leak in the engine compartment.

The EGR system can be removed, and you then need to block the EGR inlet into the air intake.

With the EGR removed you will be getting more air into the engine causing it to lean a little (the EGR puts burnt fuel CO2 into the engine instead of air) so you may want to bump up the fuel pressure or change the resistance on the head temp sensor, I'm not a L-Jet guy so that's just an educated guess.
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Old 09-23-2002, 04:50 PM
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You shouldn't need to change the mixture much if any. The exhaust gas goes into the intake after the air flow meter, so the FI doesn't "know" about it. So removing it shouldn't change the mixture much if any.

--DD
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Old 09-24-2002, 09:44 AM
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This is all great. Thanks. I was hoping that the parts missing would not get in the way too much. All I was planning on doing was the exaust. I have no air injection pump, the 1.8 didn't and I was going to leave the ERG on. Would removing that help as well? It does not seen to be in a place that would effect much, performance wise.

Thanks again,
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Christopher A. Landt
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1979 911sc
1973 914 2.0
Old 09-24-2002, 10:00 AM
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