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How did the original catalyst die? Did it plug up with carbon, ash or did it melt?
Lean burn is the way.
The Honda vx series used lean burn in the 1980s and got hybrid mpg without the hybrid stuff. NOx is only bad where NOx is a problem. For about 99.9% of the land area of the lower 48 crank up the NOx and up the MPGs.
Fuel injected cars are tuned to run as close as possible to 14.7:1 that's were the lowest NOx and lowest HC are.
Peak torque is achieved with about 12.6:1 air fuel ratio.
Peak Horse power is achieved around 13.2:1 air fuel ratio.
Peak fuel economy is achieved with 15.4:1 air fuel ratio, leaner mixes are used to reduce isobaric losses.
You can drive the same distance on 16 to 18:1 air fuel mix no problem and burn that much less fuel.
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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.
Last edited by oil pan 4; 06-25-2022 at 12:36 AM..
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