[Z06] Emissions Question
Thread Starter
Race Director
Joined: Jul 2007
Posts: 10,959
Likes: 2,641
From: Texas Hill Country
Emissions Question
How does disabling the EGR and AIR in the ECU affect passing emmision tests? How about removing the parts associated? How much do they really affect power on these cars? Sorry for the newbie questions.
What does it do if you disable the systems in the tune but leave the parts installed?
What does it do if you disable the systems in the tune but leave the parts installed?
Drifting
Joined: May 2000
Posts: 1,695
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From: Long Island NY
There is no EGR valves on these engines. I don't think any of the LS series V-8's starting with the LS1 had EGR valves. The AIR pump doesn't rob much HP if at all, since it is an electric pump that only runs during cold engine startup. Once the engine and cats are warmed up, the AIR pump doesn't run (except to conduct self-tests for a few seconds once in a while). In the old days the smog pump would run off of a belt all of the time and you could pick up a few HP by removing it, but that is no longer the case with these cars.
The car will pass a smog sniffer test without the AIR pump, however, some states like NY don't use the sniffer test for '96 and newer OBD-II equipped cars like ours. They hook the state computer to the car computer and check for codes. I'm not sure if they check for disabled emissions settings in the computer, but my guess is they probably do check.
The car will pass a smog sniffer test without the AIR pump, however, some states like NY don't use the sniffer test for '96 and newer OBD-II equipped cars like ours. They hook the state computer to the car computer and check for codes. I'm not sure if they check for disabled emissions settings in the computer, but my guess is they probably do check.
Last edited by stingray454; Jul 23, 2007 at 03:41 PM.
Thread Starter
Race Director
Joined: Jul 2007
Posts: 10,959
Likes: 2,641
From: Texas Hill Country
So there's basically no practical reason to do anything with emission equipment on these cars? Even aftermarket cats are within a few HP of a straight pipe, right? Also, how tightly does your AIR line fit into your air filter? I feel like mine not be tight enough. Any drawback to this besides some potentially unfiltered air getting sucked into the filter? Thanks.
