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Old 02-02-2020, 07:56 PM   #11 (permalink)
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If you don't have a smog problem where you live and if a 3 way cat costs more, why bother?

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Old 02-03-2020, 12:19 PM   #12 (permalink)
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Quote:
Originally Posted by oil pan 4 View Post
I don't think catalytic converters effect car fuel economy at all or barely at all.
After driving my electric so much I think fuel burners all stink. If you want to reduce back pressure removing the muffler and running just a converter would be better.
I would agree but only when the car is designed to run a cat. What if because you didn't have to worry about heating up a cat you could run completely different A/F ratios? Run different timing and compression then designed for the lean burn too. I think there are a bunch of non-starters in potential economy boosters because of that rich fuel mixture the cat needs.
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Old 02-03-2020, 01:22 PM   #13 (permalink)
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Join Date: Jul 2011
Location: NewMexico (USA)
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Sub - '84 Chevy Diesel Suburban C10
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Bug - '01 VW Beetle GLSturbo
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I have ran lean burn through a cat.
You actually get more HC when you run a little lean.
Regular exhaust heat rejection will easily keep the catalyst hot enough to decompose left over HC with the abundance of oxygen. It won't do it with in 15 or 30 seconds of start up like a modern engine that runs balanced A/F but after a few minutes it will achieve decomposition.

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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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