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IROCdan330 · 03-05-2008, 06:14 AM

an emissions chip doesn't exist. the computer compensates more than enough to pass NJ sniffer (unless the car has been tampered with by someone who doesn't know what theyre doing, or is heavily modified)...leaning out the mixture through the computer will only cause the combustion chamber temps to go up and NOx gasses to rise, which may cause it to fail. There is a balance there with fan temps however, a slightly hotter engine will generally be more emissions friendly, so fans coming on later would help.

a tune on a modified car is helpful, but the tune for max performance would be the same tune to use to pass emissions, as the idea is to tune for stoich for driveability/emissions, then use the power enrichment for the WOT stuff, 12.6-13.1 AFR.

Like mentioned above, you need a cat to pass (summit has direct bolt in 3 inch high flows for cheap, and they work)...you don't need an EGR, but you can't have a SES light either. So if you dont have it or its messed up, you have 2 options, 1: tune it out, or 2: disconnect the battery for a few minutes, and drive straight to the inspection station. The 2nd option may cause you to fail for HCs though, as the computer may not have had enough time to learn in the BLMs, based on modifications of course. Air pump is negligible, as it doesn't do anything but help to heat up the cat and oxygen sensor...long enough run time will generally get that done anyways...so if they pop the hood and dont know what theyre looking at, you should be ok.

Kid Racer: I told you once, and I will tell you again...get a basic tune-up, change out all the basic crap, and see where that gets you...with a better running car you are more likely to pass.

03-05-2008, 06:14 AM	#9
IROCdan330 12 Second Club Join Date: Sep 2004 Location: Vineland Posts: 928 iTrader: (0)	an emissions chip doesn't exist. the computer compensates more than enough to pass NJ sniffer (unless the car has been tampered with by someone who doesn't know what theyre doing, or is heavily modified)...leaning out the mixture through the computer will only cause the combustion chamber temps to go up and NOx gasses to rise, which may cause it to fail. There is a balance there with fan temps however, a slightly hotter engine will generally be more emissions friendly, so fans coming on later would help. a tune on a modified car is helpful, but the tune for max performance would be the same tune to use to pass emissions, as the idea is to tune for stoich for driveability/emissions, then use the power enrichment for the WOT stuff, 12.6-13.1 AFR. Like mentioned above, you need a cat to pass (summit has direct bolt in 3 inch high flows for cheap, and they work)...you don't need an EGR, but you can't have a SES light either. So if you dont have it or its messed up, you have 2 options, 1: tune it out, or 2: disconnect the battery for a few minutes, and drive straight to the inspection station. The 2nd option may cause you to fail for HCs though, as the computer may not have had enough time to learn in the BLMs, based on modifications of course. Air pump is negligible, as it doesn't do anything but help to heat up the cat and oxygen sensor...long enough run time will generally get that done anyways...so if they pop the hood and dont know what theyre looking at, you should be ok. Kid Racer: I told you once, and I will tell you again...get a basic tune-up, change out all the basic crap, and see where that gets you...with a better running car you are more likely to pass. __________________ 87 iroc with the usual go fast stuff heavier than your half ton.