 High-Flow Cat, Will it affect O2 reading? |
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 Nov 16, 2003 - 11:36 PM
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Enthusiast  Joined Nov 3, '03 From Iowa Currently Offline Reputation: 0 (0%)  |
Hi all. I'm kinda new to this forum. Just got my 96 St Coupe a couple of weeks ago. Traded my 99 Solara for it....and $3000
 Anyway, I am orderin up parts and I wondered if anybody with OBD2 has installed a high-flow cat. If so, does it affect the rear O2 sensor and set the cel? I ordered a corolla high-flow and according to the toyota part numbers, the st and corolla 7afe share the same cat so hopefully it will be a direct bolt on. Let me know if anybody has any info. Thanks. |
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Nov 17, 2003 - 12:02 AM
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 Enthusiast Joined Aug 30, '02 From Anaheim, CA Currently Offline Reputation: 0 (0%) |
good idea with the corolla high flow cat let us know how it fits high flow cats still get the job done so it wont set off a CEL i have ran my car with the second o2 out of the exhaust with out a CEL. -------------------- 1994 Celica GT4 WRC Edition
@gt4.wrc on Instagram |
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Nov 19, 2003 - 12:01 AM
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 Enthusiast Joined Aug 29, '02 From Dallas, Tx Currently Offline Reputation: 0 (0%) |
Nope, it shouldn't mess with the O2 reading at all.
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Nov 19, 2003 - 12:58 AM
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Enthusiast Joined Nov 3, '03 From Iowa Currently Offline Reputation: 0 (0%) |
Thanks guys. It should be here this week and if it is a direct fit I will slap it in and see what happens.
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Nov 19, 2003 - 7:16 AM
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 Enthusiast Joined Sep 27, '02 From UK Currently Offline Reputation: 1 (100%) |
You'll probably have to modify the header bracket where the cat fits on.
I had to enlarge the holes for it to fit properly. Fits up nicely to the Greddy SP though. (I have the OBX high-flow cat. for the corolla). BTW: I have no problem with 02 sensor reading. |
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Nov 22, 2003 - 7:29 PM
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Enthusiast Joined Nov 3, '03 From Iowa Currently Offline Reputation: 0 (0%) |
Got the cat yesterday and installed it. 4 bolts. Pretty easy, except getting the old rusty ones out laying on my back in the garage. It seems to breathe a bit better but I really need to get a more high flow muffler. Does it make a difference if I just get a muffler or is it better to get a complete cat back?
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Nov 23, 2003 - 8:34 AM
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 Enthusiast Joined Nov 27, '02 From Charlotte, NC Currently Offline Reputation: 0 (0%) |
Cat-back. The increase in piping size will increase flow better.
-------------------- Black 1996 Celica GT Convertible For Sale
Alpine Silver Lexus GS300 |
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Nov 24, 2003 - 12:46 AM
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Enthusiast Joined Aug 29, '02 From Dallas, Tx Currently Offline Reputation: 0 (0%) |
Yup, just don't increase the size too much. 2.25" is perfect for most n/a celicas. 2.5" is better for highly modified n/a cars. If you make the tubing too large for the other mods then you'll lose a lot of scavenging and as a result low end torque (and you won't make any more top end power).
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Nov 25, 2003 - 10:49 PM
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Enthusiast Joined Nov 3, '03 From Iowa Currently Offline Reputation: 0 (0%) |
Floored it today and the check engine light came on. Threw a code for catalyst inefficiency or some damn thing. It must not be converting very well. Does anybody know where to get an o2 simulator for our cars? I can't find one anywhere.
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