Ferrari Mailing List: Re: Has aynone Purchased Stebro 355 Cats ?

[Doug and Terri Anderson (dnt]

> From Dave's post (who wrote the original?)  "From what I have read, it is 
very important in the design of a cat, the location and depth of the mounts 
for the O2 sensors.  If they are not placed
correctly, you will get "check engine" lights illuminated on your dash and 
error codes in the OBDII"

There are generally two O2 sensors for the cat - one pre and one post.  The 
computer is set up to see what amounts to a sine wave on the pre cat sensor 
(that dithers the fuel mixture rich/lean so the TWC - three way cat - does 
its magic) and a flat line on the post cat sensor.  If the post cat sensor 
starts sending a sine wave - the computer thinks the cat is dead and sets 
the MIL or check engine light.

DOUG


----- Original Message ----- 
From: "Dave Handa" <dave [at] davehanda.com>
To: "DOUG" <dnt [at] dock.net>
Cc: "'The FerrariList'" <ferrari [at] ferrarilist.com>
Sent: Wednesday, February 28, 2007 9:25 PM
Subject: Re: [Ferrari] Has aynone Purchased Stebro 355 Cats ?


> Regardless of the design, I have heard way too many horror stories on
> Ferrarichat.com to recommend dealing with Stebro.  Seems at least 50% of
> people have problems with either late delivery, no delivery, being charged
> and not shipped, and not getting a refund on returned product.  Also 
> issues
> with fitment as well.  I remember one guy returned his exhaust three times
> and never got one that fit! Don't be tempted by the low prices...
>
> > From what I have read, it is very important in the design of a cat, the
> location and depth of the mounts for the O2 sensors.  If they are not 
> placed
> correctly, you will get "check engine" lights illuminated on your dash and
> error codes in the OBDII.
>
> There are many alternate cats, Hyperflow, Capristo, Kreissieg
>
> http://www.kreissieg-usa.com/index.php?page=detail&brid=1&mid=4&cid=11&oid=1
> 2&pid=9
>
> Not sure who makes these:
> http://www.hgparts.net/catalog/product_info.php?cPath=19_10&products_id=32
>
> The factory Ansa cats don't appear to offer much restriction, but seem to 
> be
> lacking in durability.  The ceramic cores commonly fail and break loose 
> and
> rattle around and crumble apart.  One option is to remove them and have 
> them
> rebuilt here: http://www.millercat.com/recertprocess.html  Basically, they
> will cut open the cat, replace the core and reweld it.  Not sure of the
> cost, but around $400 I hear.
>
> I have no personal experience, but Brian Crall a Ferrari Tech on fchat,
> claims to have used them many times and yet to have a failure.
>
>
>
>
>
> -----Original Message-----
> From: rich [mailto:RichF355 [at] comcast.net]
> Sent: Wednesday, February 28, 2007 7:03 PM
> To: dave [at] davehanda.com
> Cc: The FerrariList
> Subject: [Ferrari] Has aynone Purchased Stebro 355 Cats ?
>
> If you have can you tell me if they are close to Hyperflow in  design and
> core construction. also if there is any big difference in air flow , etc.
> Thanks, Rich
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