I know not many people want to keep there emissions controls but some of us have to. I was just woundering why they make Long Tube headers for LS1s that are emissions legal but not for LT1s? Or do they?

Thansk,
Matt

 

From what I understand you have to move your cat a little back (or more people screw the cat and put an ORP)...moving your cat is illegal.

 

Jet hot is making an LT1 dual cat y pipe should be out in oct, so that will pass the sniffer test

 

The problem is not the "sniffer" test. Just adding a set of headers, long tube or otherwise, will not upset things so much that it will affect actual tailpipe emissions (unless of course you simultaneously install a huge cam ).

The problem is "Federal" law. You can not 1) change the number of cats; 2) the location of the cats; or 3) replace a cat that is not "defective".

On an LS1, it is possible to install LT's without disturbing the location of the cats. On an LT1, it isn't possible. So... in a state/locale with STRICT visual enforcement - i.e. "Federal" standards - LT's can't be emissions legal on an LT1. In a state/locale that doesn't peek under the car, LT's will be OK (still not "legal"... .just "OK" )

 

chris from jet hot lives in my state maybe 30 miles west of where im located, ill just ask him if he knows anybody that doesnt do the visual test, thats the only thing im afraid off not passing spending all this money on Lt's and cats and still not being able to pass would suck big time

 

Check locally first... but around here anyway, the tech guys dont do much visual checking, as long as the car passes the sniffer (really - isnt that the spirit of the law anyway). With all the different 4th gen configurations, I doubt even the guy doing the inspection could tell you what the orginal cat placement was for your model

 

yes but knowing my luck he will, but i will check to see whats up with the visual around here

 

So what exactly does the smog pump do? The way you guys are talking I won’t have a problem passing the sniffer w/o the smog pump. Am I getting that right? I would really like to put long tubes on because I want to go big cam. Right now we don't have any inspections at all but I am very afraid that they are going to come back with a vengeance. I had to sell my 79 because I put headers on it and couldn't put cats on. The emissions cut off was 78 and the stupid guy at the gas station said it would cost about $1200 to get it good enough for him to pass it then he black listed me! Bastard!

Later,
Matt

 

TTT

 

Well, I guess if I would look before I speak I would see that jet hot sells full lengths with air and egr. Does anyone have these? Who makes the headers? How much do the cost (they don't list a price)?

 

By "smog pump" I assume you mean the AIR pump. It only injects fresh air into the exhaust manifolds (or headers) during startup. It does this to help the cats heat up faster, and reduce emissions on cold start. Since most rolling/dyno emissions checks do not involve a cold start, the test will never know the AIR connections are missing.

But you also have to consider EGR, which is often deleted with LT's. EGR is required to minimize the production of oxides of nitrogen (NOx). These typically form under low/moderate loads, when lugging the engine increases combustion chamber temperatures. The recycled exhaust reduces the temperatures, and reduces NOx. This condition is typically included in the dyno emissions driving cycle. So it is possible that eliminating EGR might make is a little harder for you to pass.

 

the smog(AIR) pump warms up the cat when it's cold. That's it.

 

So does it screw with the computer if removed, can I keep my egr and get rid of the air? Does !AIR gain any hourse power?

Thanks,
Matt

 

Jet hot headers are made by jet hot. they are the hooker design with better welds and thicker steel. I have them and love them. They came with full EGR, air, and o2 hookup. No reason to get rid of emmisions stuff. deleting emissions hookups might give ya 5 hp. :P

 

Deleting the AIR won't give you any hp. It will throw a code on your OBD11 car, so it will have to be prgrammed out. On the OBD1 car, if the AIR fuse is left in, there won't be a problem.