Catalytic Converter question

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07-14-2004, 09:51 AM

Captain C

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Car: 1985 IROC-Z

Engine: 1989 350 4 bolt roller block

Transmission: ProBuilt 700R4 Road Race with Edge 9.5" 2800 stall lockup converter

Catalytic Converter question

How rich can I go with the AFR before I start doing damage to the Catalytic Converter? When I'm at the track I will have my cutout open, but I can't drive that way on the street. The local constabulary seems to have a problem with that for some reason......

Since I will have a PROMinator with a rotary dip switch I can have more than one program in the car to switch to, so multiple programs is not a real problem. Well, other than datalogging and programming time (bummer, the dreaded time monster again).

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07-14-2004, 10:26 AM

RBob

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Car: check

Engine: check

Transmission: check

Re: Catalytic Converter question

Quote:

Originally posted by Captain C
How rich can I go with the AFR before I start doing damage to the Catalytic Converter? When I'm at the track I will have my cutout open, but I can't drive that way on the street. The local constabulary seems to have a problem with that for some reason......
. . .

Actually with a cat the requirement is to go so rich that the cat goes out. Running 12.8 to 13.1 (general range, not absolute) will fry a cat. Going to 11:1 AFR has so much fuel and no left over O2 that the cat doesn't have anyhting to do. Hence safe for it.

RBob.