Cat Convertor

[Walter Petermann]

Kevin,
I used to work for a gray market conversion company. The rule
of thumb was to set up the car for a max of ~150-180ppm at idle.
This would drop to below 10 after installing the cat.
Of course cat size needs to be matched to engine size but I don't
remember the details on that.
Note that 180ppm is a starting point before installing the cat. Your
1300ppm is way off, ie no cat will get rid of that much. You might
get away with having 250-300ppm before the cat and pass the emissions,
but you would also need an air pump and the cat probably wouldn't
last very long.
Will you be using an O2 sensor or will the system be open loop?

  Walter


Will you be using an O2 sensor and air pump?

Kevin Vannorsdel wrote:
> 
>  Anyone have any experience with how much a good catalytic convertor will reduce
> exhaust HC numbers?
> 
> Also-  I assume that too much HC will cause pre-mature cat failure...  don't
> want that either.  Any comments on this?
> 
> I currently am at 1300PPM  HC at idle and need to get down to 150 or so to pass
> emissions.   Some more chip work is sure to help but curious to check if anyone
> had any comments about the cat effectiveness/failure.
> 
> Thanks!!
> 
> ________________________________________________
>   Kevin Vannorsdel     IBM Arm Electronics Development
>     408-256-6492                Tie 276-6492     kv at us.ibm.com