emissions test results
Thread Starter
Supreme Member
Joined: Oct 2000
Posts: 3,819
Likes: 3
From: Angleton, TX
Car: '92 RS
emissions test results
My dad took my car down and had it tail pipe tested yesterday, interesting results:
Standard 15 mph 25 mph
NOx: 829/751 308 289
HC: 108 253 172
CO: .6% .82% .88%
This with no emissions equipment connected, a gutted cat, and a 160 thermostat. My dad welded in a cat from a '95Z we had in the shop and he's going to put a 195 thermostat in and take it back Monday to get tested again. We're pretty confident it will pass this time.
I'm just curious why my NOx emissions are so low. What causes them and how are they that low with zero emissions equipment? All of the hardware is there, but none of it is hooked up, we just put it in for the visual test.
Standard 15 mph 25 mph
NOx: 829/751 308 289
HC: 108 253 172
CO: .6% .82% .88%
This with no emissions equipment connected, a gutted cat, and a 160 thermostat. My dad welded in a cat from a '95Z we had in the shop and he's going to put a 195 thermostat in and take it back Monday to get tested again. We're pretty confident it will pass this time.
I'm just curious why my NOx emissions are so low. What causes them and how are they that low with zero emissions equipment? All of the hardware is there, but none of it is hooked up, we just put it in for the visual test.
Joined: Feb 2000
Posts: 1,855
Likes: 13
From: St. Augustine, FL
Car: 89 GTA
Engine: 383
Transmission: 4L80E
Axle/Gears: 12 bolt-3.73
Put 5 or 6 bottles of dry gas in it and retard the timing with the higher temp thermostat, it will reduce the hc's.
Senior Member
Joined: Mar 2004
Posts: 923
Likes: 2
From: Bakersfield, CA
Car: 91 Z28
Engine: 383 SuperRam
Transmission: ProBuilt 700r4
Axle/Gears: G92 3.23
Originally posted by 89gta383
Put 5 or 6 bottles of dry gas in it and retard the timing with the higher temp thermostat, it will reduce the hc's.
Put 5 or 6 bottles of dry gas in it and retard the timing with the higher temp thermostat, it will reduce the hc's.
Thread Starter
Supreme Member
Joined: Oct 2000
Posts: 3,819
Likes: 3
From: Angleton, TX
Car: '92 RS
Car just passed emissions with flying colors.
NOx standard: 751 ppm
NOx emissions: 135 ppm
Hydrocarbon standard: 108
Hydrocarbon emissions: 33
CO standard: .6%
CO emissions: .02%
This with no air pump, no EGR. Only a cat from a '95Z with about 75K miles on it, and the temperature right at 220*
NOx standard: 751 ppm
NOx emissions: 135 ppm
Hydrocarbon standard: 108
Hydrocarbon emissions: 33
CO standard: .6%
CO emissions: .02%
This with no air pump, no EGR. Only a cat from a '95Z with about 75K miles on it, and the temperature right at 220*
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