Phantom Posted March 19, 2002 Share Posted March 19, 2002 This probably sounds like a strange subject but i am seriously planning on having these as part of my LS-1 installation. The car will be a daily commuter, not a track beast, so want to do the "environmentally correct" thing. Has anyone else out there included the cats as part of the installation? Phantom '77 280Z 2000 Grand Cherokee Ltd. '90 Bronco II Quote Link to comment Share on other sites More sharing options...
Sumo Posted March 19, 2002 Share Posted March 19, 2002 Why? You really dont need em' the computer will let you know if something is astray. But if you insist on putting one then go with a hi-flo universal cat. Good luck. Quote Link to comment Share on other sites More sharing options...
danc Posted March 19, 2002 Share Posted March 19, 2002 Phantom: I'm running a Fastburn 385 with dual 2 1/2 in and out Catalytic convertors to get through the E-Check here in Ohio. That's all I did, and my car passed all measurements on the very low side. Dan Quote Link to comment Share on other sites More sharing options...
Phantom Posted March 19, 2002 Author Share Posted March 19, 2002 Thanks Danc. Do they bolt up right at the exit to the headers or after turning toward the rear? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted March 19, 2002 Share Posted March 19, 2002 I think thats a good plan running a Cat, the hi flow ones lose nothing really HP wise, and the cat will actually usually dampen the exhaust just a bit too maybe taking out some of that resonance that can be a bummer when going down the road. As the smog laws tighten up the feds will put increasing pressure on the states to enact programs (they're already doing it), the bottom line is performance and a 'Green' LS1 Z will still whoop butt debatably on anything Detroit has put out EVER from a performance standard. All that, good gas mileage and being able to pass any smog reg someone can throw at it, handle fairly well and the reduced weight from the aluminum V8 is a plus, I'd say thats the ideal muscle car IMHO. Regards, Lone Quote Link to comment Share on other sites More sharing options...
Phantom Posted March 19, 2002 Author Share Posted March 19, 2002 While we're talking cats, my '77 is a California version and has an L28 equipped with a catalyic converter. Lonehdrider is exactly right about it dampening the exhaust tone. It acts like a resonator and causes no noticable performance losses - and this is on a 25 year old unit with 200,000 miles on it. My emmission tests have been unreal - 70 ppm HC and .07% CO. 'course the cat is really for the NO's but those aren't showing up either so it must still be working. The best thing now though is that the car is 25 years old and, in Texas, no longer subject to emmissions testing. Yee Haw!! Quote Link to comment Share on other sites More sharing options...
Owen Posted March 20, 2002 Share Posted March 20, 2002 I'm running a Random Technologies high flow 3". It's bullet shaped and I get good ground clearance (in the garage, it's not running). Owen Quote Link to comment Share on other sites More sharing options...
Briguy280Z Posted October 3, 2002 Share Posted October 3, 2002 Phantom or whoever, LS1 Exhaust question My 78 280Z was not a california car and was wondering if i will need to put catalytic converters in it? I am in CA now. After reviewing some smog law I believe that it mentioned that I will need to put everything smog related to the engine...not the exhaust...? The main reason is that the 98 Camero has O2 sensors before and after the cat. To make this work i will have to install that cat and install the O2 sensors. Are these O2 sensors apart of the engine or exhaust...and hows B.A.R. going to react if I dont put them in..(not apart of original equipment).. since they dont know everything about every car? I can easily have them programed out. But I believe i will need the check engine light installed on the vehical....I think they will check for that. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted October 3, 2002 Share Posted October 3, 2002 I think I know the answer to the first question. If you car is I believe 73 and up you have to have cat. Why? Because it will not pass visual inspection. That is one of the steps of a smog check. So you need the stuff in the engine and the stuff on the car to pass the visual part. Quote Link to comment Share on other sites More sharing options...
DavyZ Posted October 4, 2002 Share Posted October 4, 2002 Hmmm, that is a very interesting question regarding the cats. My first educated guess would be that you would not need them since they are considered part of the chassis. However, what you posed about the O2 sensors makes me very nervous about the whole thing. Man, it is more and more that the whole car is becoming one big emissions unit and one part cannot do without the other Davy Quote Link to comment Share on other sites More sharing options...
Helldrives Posted October 4, 2002 Share Posted October 4, 2002 Its 74 and up that need to pass the smog requirements. However if for some reason your caught with a more modern engine in your car you can be flag for a referee inspection. Of course they need your consent, a warrant, or probable cause to search you engine bay. Before I was into Zs I was into Camaros. Wanted to stuff a 502 in my 74, but I would've had to wait till 2004. That car was heavy it weight over 4000lbs. 1st ride in a Z changed that plan. Quote Link to comment Share on other sites More sharing options...
Mike C Posted October 4, 2002 Share Posted October 4, 2002 I believe the rule on cats is they are part of the emissions equipment and as such must be installed with an engine swap, at least in CA. Just like the charcoal cannister. The JTR manual talks a little about passing smog requirements, particularly those in CA. If it'll pass there, it'll pass pretty much everytwhere! Quote Link to comment Share on other sites More sharing options...
Mike C Posted October 4, 2002 Share Posted October 4, 2002 Stupid edit, keeps getting Internal error message. If it's not in the JTR V8Z manual, it is in their How to swap GM tpi tbi engine manual. Quote Link to comment Share on other sites More sharing options...
Guest Perry Posted October 4, 2002 Share Posted October 4, 2002 my understanding is such: Federal requirement is that for swaps you use the engine and all emmisions equipment from the same year or newer car. Technically this includes the exhaust all the way to and including the Cat. Pennsylvania doesn't treat swaps special, they require whatever was on the stock engine. so my 77 280Z had EGR and charcoal canister but no cat, meaning in the visual exam they will be looking for EGR and charcoal but not cat. Then the emissions must meet the requirements for the L6, which where I live only checks % and not flow. Also they allow for wear over the years by allowing a bit worse emissions each year. A clean running V8 should pass without trouble. (I hope ) Perry Quote Link to comment Share on other sites More sharing options...
Phantom Posted October 4, 2002 Author Share Posted October 4, 2002 I love Texas! Any vehicle at least 25 model years old as of January 1 of each year is exempt from emmissions testing and only required to do the $12.50 safety inspection. My June '77 production date car exempted on Jan 1 of this year. Quote Link to comment Share on other sites More sharing options...
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