Question on relocating catalytics on a 1uz
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I'm currently doing a w58 swap on my 1uz and my slave and clutch fork cannot be installed without hitting the stock cat. I was thinking about placing them where the forward mufflers are right after the tunnel but I think they won't generate enough heat to function properly. They need a good amount of heat to work right? I would also have to move the 2nd pair of 02 sensors behind the cats. The car is a 98 and since I live in Cali I do not want to just delete them. For guys with IMF or Rush headers where are you guys relocating your cats?
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Good question. I'm doing the IMF-w58 right now and just plan on putting a center cat after the Y merges. Will one center cat be enough to pass emissions, I don't know yet. I'll leave the downstream 02 sensors where they are for now (I'll have 4 02 sensors before the cat, which is stupid) and see if I can pass emissions that way. I'm OBD1 so it might be different for you since you have a 98.
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I'm currently doing a w58 swap on my 1uz and my slave and clutch fork cannot be installed without hitting the stock cat. I was thinking about placing them where the forward mufflers are right after the tunnel but I think they won't generate enough heat to function properly. They need a good amount of heat to work right? I would also have to move the 2nd pair of 02 sensors behind the cats. The car is a 98 and since I live in Cali I do not want to just delete them. For guys with IMF or Rush headers where are you guys relocating your cats?
Good question. I'm doing the IMF-w58 right now and just plan on putting a center cat after the Y merges. Will one center cat be enough to pass emissions, I don't know yet. I'll leave the downstream 02 sensors where they are for now (I'll have 4 02 sensors before the cat, which is stupid) and see if I can pass emissions that way. I'm OBD1 so it might be different for you since you have a 98.
here's a link to those cats. http://www.magnaflow.com/02catalytic...niversal=49956
I got mine off Ebay for $79ea
Here's my exhaust thread, you might find some pics that might help.
https://www.clublexus.com/forums/per...-98-sc430.html
Last edited by spdrcr771; 08-03-11 at 04:06 PM.
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Hmm... one center cat actually sounds like a good idea. The stock cat definitely won't fit. It's around 4" clearance from stock header to slave bleeder screw. Even if I angle it up it's just too long. I might be able to fit an aftermarket one though. The smallest cat I could find are 8" long with 4" center section and 3" total diameter which are magnaflow 50005. I can cut them to make them even shorter. BUT they're 2.25. If they don't fit then maybe I'll route em next to the tranny. How come you don't think one cat will be enough? Flow restrictions or emission wise? BTW I read your whole thread about your new exhaust setup. Very nice and informative.
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Hmm... one center cat actually sounds like a good idea. The stock cat definitely won't fit. It's around 4" clearance from stock header to slave bleeder screw. Even if I angle it up it's just too long. I might be able to fit an aftermarket one though. The smallest cat I could find are 8" long with 4" center section and 3" total diameter which are magnaflow 50005. I can cut them to make them even shorter. BUT they're 2.25. If they don't fit then maybe I'll route em next to the tranny. How come you don't think one cat will be enough? Flow restrictions or emission wise? BTW I read your whole thread about your new exhaust setup. Very nice and informative.
Im trying to come up with something, but I cant see what you got. Do you have any pics to post.
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I really appreciate your help in all of this. I took some photos and I'll load em up tomorrow. I tried taking the pass side cat off today and stripped 2 lugs and rounded 1 nut. So... I ended up yanking out the motor. Didn't wanto to fuss with taking the manifold off which I don't think is even possible with the cat attached. Besides the motor could use alittle freshening up. It was my first time removing the 1uz and it wasn't as involved as I thought It'b be. So I guess after I decide what to do (just replace gaskets or crack it open and do fresh rebuild) I'll get back to the exhaust situation once the motor is back in. Looking at my header options... I think the s&s and ppe are the only ones that'll fit. The pipes on the IMF look alittle too long before they merge. The ppe and s&s should be the same length since they "bolt" up to stock exhaust system right? I know you had both
Last edited by Da Coupe; 08-04-11 at 08:35 PM.
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