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View Full Version : 2 Cats?!?!


JrTekSilverP5
03-01-2003, 02:20 PM
y do we have 2 cats... and are both of them actually cats... and what does each of them do... and does the second one matter????
zoompr5man
03-01-2003, 02:23 PM
by removing the 2nd cat, would this make your check engine light go off??
falkofire
03-01-2003, 02:30 PM
we have 2 cats...the first one is mostly for start-up emissions..and the second is my guess for everyday driving...jst filtering the exhaust...I don't really know what it does..:confused:
Keith@FP
03-01-2003, 05:40 PM
That's right. The first one "lights up" quicker because it's closer to the engine.

Keith
melicha8
03-01-2003, 07:58 PM
Is it the same kind of catalyst? I would like to change it to a high flow cat after my turbo
JrTekSilverP5
03-01-2003, 08:25 PM
Originally posted by Keith@FP
The first one "lights up" quicker because it's closer to the engine.

can u explain... "LIGHTS UP"?!?!

and what would happen if i was to completely bypass the second cat??
JrTekSilverP5
03-02-2003, 01:21 AM
no1's gonna answer my ??'s
low_psi
03-02-2003, 02:27 AM
nothing will happen if you get a test pipe or hiflow cat for the 2nd cat. read the header posts if you wanna get into removing the primary cat.

the 2nd cat only filters the fumes, no sensors are located on or after that cat.
Aricjm15
03-02-2003, 03:09 AM
ever see how a flame will turn green if you hold a thin piece of copper wire in it, the piece of wire will be red hot also
I think thats what he means by "lights up"

it just comes to operating temp faster I guess
KYREDP5
03-02-2003, 09:04 AM
We don't have 2 cats. One is really a dog that chases the other cat.:D Sorry couldn't help it.
LinuxRacr
03-02-2003, 10:04 AM
I have one cat now! :D
zoomp5
03-02-2003, 11:45 AM
we do have two cats i had my 2nd one removed and changed to a high flow cat but the first one is very restrictive
StuttersC
03-02-2003, 05:48 PM
The first one flows well, it is the outlet of the first cat and the connecting pipe that really seems to be the culprit for bad flow.

Traveller has found this out by changing the connecting pipe on his car, and enlarging the outlet of the first cat.

FP is working on a way to get around this restriction as well.
falkofire
03-02-2003, 05:57 PM
its all about no cats and str8 piped(2thumbs)