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Catalytic converter for lean burn
To make my stroked out, high compression big block as inconspicuous as possible I want it to look like a normal vehicle (above and below), sounding normal with converter and muffler and smell normal, not belching off unburned fuel.
Normal engines try to keep the air fuel ratio as close to 14.7 to 1 as possible under about 99% of the run time.
Normally Catalytic converters seem to clean exhaust that shifts rapidly between slightly rich and lean or will go rich briefly.
But my tune runs about 18 and 16 to one at idle then going down the road it runs 15.5 and 16.5 to 1.
The suburban because it is a 1985 and 3/4 ton appears to be emissions exempt according to the stickers I found in the engine bay and on the motor.
Not too worried about the exhaust being restricted because it will have an electric cut out.
Can a normal converter run lean pretty much continuously?
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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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