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Old 01-31-2009, 02:46 PM   #10
JohnBlaze
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Join Date: Apr 2007
Location: DC Metro
Posts: 7,148
My Ride: Black Sunshine
Quote:
Originally Posted by MyKmYk View Post
So from what my exhuast guy has said, the problem with O2 sims is that it will cause the car to run too lean on a regular basis, causing the car the get worse mileage. Additionally, it will cause the racing cats to fail prematurely should I have cats put on. So thats not too encouraging to me.

But all these issues are just so.....!
The postcat O2's have nothing to do with running to rich or lean. It's the precat O2's readings that the on board computer uses to modify air fuel ratio. The postcat O2's are simply for emissions readings, or that's my understanding...
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