Author Topic: What do you make of these SMOG test results? (Read 2819 times)

bmwman91 · « **on:** July 16, 2007, 09:52:14 PM »

I went in for the test today. I had the MAF on there as well as my Conforti chip and LC-1 WBO2. Damn close to passing, kinda. I had tweaked the LC-1 a little bit lean for economy too.

15MPH Test - FAILED (Gross Polluter to boot!)
% CO2 - 14.7
% O2 - 0.5

Hydrocarbons (PPM)
Allowable - 124
Measured - 12

CO %
Allowable - 0.78
Measured - 0.01

NOx (PPM)
Allowable - 815
Measured - 2317 :eek:

25MPH Test - PASSED
% CO2 - 15.0
% O2 - 0.1

Hydrocarbons (PPM)
Allowable - 98
Measured - 4

CO %
Allowable - 0.66
Measured - 0.00

NOx (PPM)
Allowable - 754
Measured - 714 :cool:

Since this I have put the stock AFM back in, and have set the LC-1 back to its original (too rich IMO) set points. I get a free retest, so hopefully this will go OK. I do not want to buy a new cat if I do not have to. Running a little lean usually does this on the M42 right? High compression motors are a PITA to smog, my last one sure was. Sigh, pain in the rear.....

AL GReeNeRy · « **Reply #1 on:** July 17, 2007, 03:31:47 AM »

your nox shouldnt be that high at all. if you have a good working cat and your egr system is functioning properly everything thould be good. try richening your mixture out a little bit and you should be fine.

bmwman91 · « **Reply #2 on:** July 17, 2007, 10:18:12 AM »

Yeah I can tell by the econometer on the way to work this morning that it is running richer. I put the WBO2 controller back to its original (too rich IMO) setting and the AFM back in. Retesting today, 5PM sharp!

gearheadE30 · « **Reply #3 on:** July 17, 2007, 11:22:43 AM »

Good luck with that. Haha I love indiana smog laws, or rather lack therof

bmwman91 · « **Reply #4 on:** July 19, 2007, 10:55:48 AM »

Hokay, so I passed after setting the WBO2 back to its original settings (too rich IMO) and swapping the AFM back on. Talk about a narrow pass at 15mph! I think I will replace the cat just for the environment's sake!

15MPH Test - PASSED, BARELY
Hydrocarbons (PPM)
Allowable - 124
Measured - 124

CO %
Allowable - 0.78
Measured - 0.76

NOx (PPM)
Allowable - 815
Measured - 9 - Wow, what a difference 14.2:1AFR makes versus 15.2:1AFR!

25MPH Test - PASSED, with a decent margin compared to the above!

nuvolarossa · « **Reply #5 on:** July 19, 2007, 11:55:03 AM »

I passed smog today with a lc-1 feeding the ecu narrowband input, with a error about the heater circuit open (i left old heater wires not connected, I should solve that with a 18W-14V brake bulb...

).

Now I'm happy, after all wiring and ground problems the LC-1 is making a great work...

AL GReeNeRy · « **Reply #6 on:** July 19, 2007, 03:35:15 PM »

Quote from: bmwman91;29933

Hokay, so I passed after setting the WBO2 back to its original settings (too rich IMO) and swapping the AFM back on. Talk about a narrow pass at 15mph! I think I will replace the cat just for the environment's sake!

15MPH Test - PASSED, BARELY
Hydrocarbons (PPM)
Allowable - 124
Measured - 124

CO %
Allowable - 0.78
Measured - 0.76

NOx (PPM)
Allowable - 815
Measured - 9 - Wow, what a difference 14.2:1AFR makes versus 15.2:1AFR!

25MPH Test - PASSED, with a decent margin compared to the above!

yupp makes sense to me.. when the mixture is a little rich it cools down the combustion chamber and nox decreases.. since you passed you can go ahead and go back lean and save some $$$ on gas