Question about emmissions results
Thread Starter
Drifting
Joined: Jun 2000
Posts: 1,476
Likes: 1
From: Mt Juliet TN
Question about emmissions results
I remember reading a post somewhere that you can tell a lot about the way your car is running by the emmisions test. I was wondering if anyone could read my results and let me know. I just got back from the testing center my car passed (WOOOHOOO) and here are my results
HC 123
CO 3.65
CO2 10.17
The HC didn't change with the new motor but the CO went from <1 on the stock L48 to 3.65. Anyway any thoughts would be appreciated. I'm still trying to dial in my carb so I thought this might tell me something.
HC 123
CO 3.65
CO2 10.17
The HC didn't change with the new motor but the CO went from <1 on the stock L48 to 3.65. Anyway any thoughts would be appreciated. I'm still trying to dial in my carb so I thought this might tell me something.
Burning Brakes
Joined: Apr 2000
Posts: 1,207
Likes: 1
From: Cave Creek AZ
Re: Question about emmissions results (TTop Tony)
What are the allowable limits for each catagory? That would tell a lot when comparing to what is coming out the end of the tail pipes. :yesnod:
JoeB
JoeB
Race Director
Joined: Sep 1999
Posts: 11,360
Likes: 382
From: Plano TX
Re: Question about emmissions results (TTop Tony)
What are the units? Different states measure in diff units. If the HC is in PPM, you're doing good.
The CO (if it's in percent), is a little high. You can try leaning the idle mixture just a hair.
The CO (if it's in percent), is a little high. You can try leaning the idle mixture just a hair.
Race Director
Joined: Sep 1999
Posts: 11,360
Likes: 382
From: Plano TX
Re: Question about emmissions results (TTop Tony)
Ok, makes sense. Yes, you're running a bit rich. Not that bad, though. You don't have a cat, right?
I would expect a stock motor correctly tuned to make about 1% CO. The HC count is usually decent with stock cams. Hi-perf cams will skyrocket the HC due to overlap.
The CO2 value is just there to make sure you don't have exhaust leaks.
Edit: Your sig says you have a cat. Kind of high numbers then... Lean it out a bit.
[Modified by zwede, 3:32 PM 4/27/2002]
I would expect a stock motor correctly tuned to make about 1% CO. The HC count is usually decent with stock cams. Hi-perf cams will skyrocket the HC due to overlap.
The CO2 value is just there to make sure you don't have exhaust leaks.
Edit: Your sig says you have a cat. Kind of high numbers then... Lean it out a bit.
[Modified by zwede, 3:32 PM 4/27/2002]
Thread Starter
Drifting
Joined: Jun 2000
Posts: 1,476
Likes: 1
From: Mt Juliet TN
Re: Question about emmissions results (zwede)
I do have a CAT and its not quite a stock motor but not too radical. I'll try to lean it out. Thanks for the help guys.
[Modified by TTop Tony, 11:19 PM 4/27/2002]
[Modified by TTop Tony, 11:19 PM 4/27/2002]
