Re: I NEED A DEAD CAT! (4KQ senior project)

[Orin Eman <orin@wolfenet.com>]

> Interesting...especially since with a hollowed cat, my car passed the 
> smog test, in CALIFORNIA for god's sake well below the legal limits.  

So WHAT?  The limits are lax.  They are set to allow well
tuned carbs to pass.

> fuel mixture.  A properly tuned fuel injected car, especially nowadays is 
> just as clean without a cat as with.  Hell, remember the F50?  That car 

Untrue.  If the car is running in the cat's 80% efficiency window
(which a well tuned car will), your emissions are FIVE times
more with no cat than with one.

> had a cat bypass for higher RPM's because it was just as clean without 
> it.  Same with the 944 turbo if i remember correctly.  I think you need 

More likely they are using a rich mixture at this point on
the maps.  That would melt the cat which would be very bad
for their emissions warranties...  There are areas on the map of
load/rpm that aren't covered in the emissions tests/rules
where almost anything goes.  The MC engine with WOT switch
closed for example uses a fixed rich mixture.  Indeed, looking
at the before/after cat curves, it would be 'just as clean'
without the cat at this point.

Orin.