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Location:
Sydney
Registered:
October 2003
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Do you need another cat besides the primary?
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Sun, 30 January 2005 19:37
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Hi,
Looking at getting an exhaust made up for the aw11 and I'm tossing up between either
1) getting a dump made, a new cat, and the rest of the exhaust made up to suit the mufflers I already have (B-pipe with flex bend etc)
2) just getting the B-pipe made
Now, if money wasn't an issue in this already costly conversion, I'd just go for option 1.
But I'm thinking of going with option 2 until funds allow (well when the Minister of Social and Financial Affairs allows me to  ). That is, unless I need to run another cat besides the primary cat (pictured below), then I might as well bite the bullet and get the thing done properly to start with.
Thanks in advance,
Dave
Here's a pic of the current setup, primary cat coloured blue.
Also, anyone know what the hell the P1 sticker on the timing cover means?
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Location:
Sydney
Registered:
September 2003
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Re: Do you need another cat besides the primary?
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Mon, 31 January 2005 00:39
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JDM 3S-GTE powered MR2's only ran a primary cat, so you shouldn't need more than that to pass emissions etc
.....although, having another look at the pic that seems to be a GT-Four 3S, I'm not sure if they ran a secondary cat or not....
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Location:
Sydney
Registered:
October 2003
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Re: Do you need another cat besides the primary?
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Mon, 31 January 2005 01:27
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Thanks for the info Senor_2!
It is indeed a JDM ST185 3SGTE, but from what I've seen, the differences between the MR2 and GT4 exhaust lies after the primary cat. So if the MR2's didn't have one, I might take the chance.
Some side questions though that might sway my decision back towards option 1.
Is an aftermarket cat (high flow I suppose) better for emissions than the primary cat pictured here?
Would a motor sitting around for a year or so kill a cat, is there a way to tell if a cat is still functional?
If I get engineered with the standard dump and cat, would it be explicitly mentioned on an engineers report (ie, could I change afterwards without needed to be re-engineered)?
Cheers,
Dave
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Location:
Newcastle
Registered:
January 2005
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Re: Do you need another cat besides the primary?
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Mon, 31 January 2005 02:24
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Just get the dump pipe. One cat is enough. Tell you what else, when I put a 3" dump pipe on my 3SGTE I felt SOOOO much difference... was almost as good as when I put the microtech LT8 on. Two best mods I ever did on that car...
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Location:
Sydney
Registered:
October 2003
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Re: Do you need another cat besides the primary?
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Mon, 31 January 2005 02:36
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I know the difference in performance is substantial, but so is the cost 
My estimates:
$350 (dump) + $200 (cat) + $300 (pipework/labour) > $300 (pipework/labour)
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Location:
Sydney
Registered:
September 2003
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Re: Do you need another cat besides the primary?
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Mon, 31 January 2005 04:15
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| davedave wrote on Mon, 31 January 2005 12:27 |
Is an aftermarket cat (high flow I suppose) better for emissions than the primary cat pictured here?
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There shouldn't be much of a difference if it's a good quality cat
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Would a motor sitting around for a year or so kill a cat, is there a way to tell if a cat is still functional?
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If you still have the engine out of the car like in the pic, you should be able to see the condition of the catalyst itself, look for any deterioration or if there are any bits rattling around inside
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If I get engineered with the standard dump and cat, would it be explicitly mentioned on an engineers report (ie, could I change afterwards without needed to be re-engineered)?
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My engineers report doesn't go into too much detail on this, there is a small section on exhaust and emissions equipment, just saying everything complies (I'm running standard dump + cat also)
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Registered:
May 2002
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Re: Do you need another cat besides the primary?
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Mon, 31 January 2005 06:00
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You could always take the cat out completely and make a couple of flanges somewhere down the line so you can swap between a pipe and a cat for rego checks/e.t.c...
...but that would be wrong...
Tim.
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