Cat question? - ZR-1 Net Registry Forums

N8nSM · 03-02-2006

First off, thank you again to all that responded in regards to the Z dying after entering open loop. It was the fuel pump (andtuel pressure regulartor as I found also). I've got all that replaced now and back together. I'm still trouble shooting a high idle problem (idling at 3k when started).

At any rate, I've got the Corsa exhaust that is ready to go on one I figure out the idle problem. I was thinking about adding a set of high flow cats but it looks like the cats are connected directly tot he exhuast manifolds. What's the best way to replace these and what part numbers do you have? Do I cut the cats at the exhaust manifolds and weld back in place? What's the best procedure for this?

Thank you all,

-Nate

ZR1 MK · 03-03-2006

Wht are you looking to replace the cats? If they need replacement, the exhaust manifold and cat are one piece for your year car and must be replaced as one unit.

Z Factor · 03-03-2006

Quote:

Originally Posted by N8nSM

I was thinking about adding a set of high flow cats but it looks like the cats are connected directly tot he exhuast manifolds. What's the best way to replace these and what part numbers do you have? Do I cut the cats at the exhaust manifolds and weld back in place? What's the best procedure for this?

Thank you all,

-Nate

You are correct in that they are connected. You can have a shop either cut and replace them, or gut them out but leave the housings there for inspection. If you are going to go to the expense of replacing the stock set up, I'd recommend headers instead, followed by high flow cats attached to them.

N8nSM · 03-03-2006

Headers would be nice, but I'm in CA. Does anyone know of a set of CARB legal ZR-1 headers?

ZR1 MK · 03-03-2006

Whats CA view on cats that need replacement, but stock replacement part isnt available from manufacturer?

N8nSM · 03-03-2006

I don't know what the SMOG Nazzi's say, but I've had exhaust shops weld up the high-flow cats before and they pass inspection as long as they have a registered CARB number (California Air Resource Board).

-Nate

blackjack · 03-22-2006

as anyone ever gutted their cats?
how much power can be expected with this operation?
is it worth the trouble?
blackjack
91/1735

03-02-2006	#1
N8nSM Join Date: Feb 2006 Location: Santa Maria, CA Posts: 20	Cat question? First off, thank you again to all that responded in regards to the Z dying after entering open loop. It was the fuel pump (andtuel pressure regulartor as I found also). I've got all that replaced now and back together. I'm still trouble shooting a high idle problem (idling at 3k when started). At any rate, I've got the Corsa exhaust that is ready to go on one I figure out the idle problem. I was thinking about adding a set of high flow cats but it looks like the cats are connected directly tot he exhuast manifolds. What's the best way to replace these and what part numbers do you have? Do I cut the cats at the exhaust manifolds and weld back in place? What's the best procedure for this? Thank you all, -Nate

03-03-2006	#2
ZR1 MK Join Date: Aug 2005 Location: NY Posts: 142	Re: Cat question? Wht are you looking to replace the cats? If they need replacement, the exhaust manifold and cat are one piece for your year car and must be replaced as one unit.

03-03-2006	#4
N8nSM Join Date: Feb 2006 Location: Santa Maria, CA Posts: 20	Re: Cat question? Headers would be nice, but I'm in CA. Does anyone know of a set of CARB legal ZR-1 headers?

03-03-2006	#5
ZR1 MK Join Date: Aug 2005 Location: NY Posts: 142	Re: Cat question? Whats CA view on cats that need replacement, but stock replacement part isnt available from manufacturer?

03-03-2006	#6
N8nSM Join Date: Feb 2006 Location: Santa Maria, CA Posts: 20	Re: Cat question? I don't know what the SMOG Nazzi's say, but I've had exhaust shops weld up the high-flow cats before and they pass inspection as long as they have a registered CARB number (California Air Resource Board). -Nate

03-22-2006	#7
blackjack Join Date: Aug 2005 Location: north of montreal Posts: 510	Re: Cat question? as anyone ever gutted their cats? how much power can be expected with this operation? is it worth the trouble? blackjack 91/1735