D16SohcVtec

Hey guys, I'm having a hard time passing emissions with my NA vitara D16z6. Timing is at 16 degrees, AFR's at idle and cruise are 14.5 - 14.7. The car has new O2 sensor, new plugs, new dizzy, new carsound cat, stock 2" exhaust with muffler, new PCV, new plug wires. Running stock d16z6 fuel and ignition maps. Any advice would be appreciated.

Setup:
D16z6 head
stock port
skunk2 IM
60mm LS tb

d16z6 block
75mm vitara pistons
eagle rods

Fuel management is Neptune RTP

On my first attempt I failed, this was the emissions reading. Timing was advanced .25 degress throughout the map.

HC (PPM)
Cruise Limit: 170
Cruise Emissions: 147

Idle Limit: 220
Idle Emissions: 263

CO
Cruise Limit: 1.2
Cruise Emissions: 0.67

Idle Limit: 1.2
Idle Emissions: 0.71

I retarded timing .25 degress throughout my map and failed a second time. This is what the second emissions test read.

HC (PPM)
Cruise Limit: 170
Cruise Emissions: 99

Idle Limit: 220
Idle Emissions: 413

CO
Cruise Limit: 1.2
Cruise Emissions: 0.61

Idle Limit: 1.2
Idle Emissions: 0.91

As you can see retarding timing a bit helped all of the other parts do better, but it made idle HC worse.

Advice would be appreciated. Thanks

EARLdaSQUIRREL

so if retarding it made it worse, advance the timing at idle

HiProfile

If you posted the NOx and co2 results, I could give more help.

As it stands, it looks like your car is idling rich, and that you need to add more timing - as much as 2-3*. W/o the NOx readings, I can't really say what the best timing would be. Too much timing tends to create more NOx (heat), too little can create CO (incomplete burn). Too much fuel obviously creates unburned hydrocarbons (gasoline, HC), as well as CO because there isn't enough oxygen to create co2.

Hybrid96EK

You should be thankfull as hell you are able to run an OBD-1 ECU and do something with the basemap. I had to pass my vitara Y8 on the stock 96 EX ECU. Talk about a pain in the ***!!! I wound up driving about 70 miles to set all the monitors and then still didn't pass. Eventually I did that crap "guaranteed to pass" in a bottle and BARELY squeezed by. Oh well, I guess at least its only every two years.

D16SohcVtec

The emissions sheet doesn't list NOx. It only lists HC(PPM), CO(%), CO+CO2(%), and O2(%).

For the first attempt.

CO+CO2(%)
Cruise Limit: 6
Cruise Emissions: 14.97

Idle Limit: 6
Idle Emissions: 14.41

O2(%)
Cruise Limit: 6
Cruise Emissions: 0.74

Idle Limit: N/A
Idle Emissions: 1.51

For the second attempt.

CO+CO2(%)
Cruise Limit: 6
Cruise Emissions: 15.21

Idle Limit: 6
Idle Emissions: 14.11

O2(%)
Cruise Limit: 6
Cruise Emissions: 0.65

Idle Limit: N/A
Idle Emissions: 1.53

Both of these are N/A for pass or fail.

inspector01

I have never had emissions test, so im not sure exactly how they work, but what about running it with E85 or at least some ethanol mixed in. I am going to be trying that out sometime soon to help a guy out who needs to pass, we are going to try and pass on E85 and no cat.

D16SohcVtec

I forgot to mention that I also running a zex 59300 cam right now also.

HiProfile

Appears its running rich, maybe your wideband is off a little (showing up leaner). If running a narrowband during the test, it might be shot. Your cat might also be dying, not able to convert CO and HC's into CO2 and water vapor.

Regardless, see if you can sneak it in with the wideband and run it lean. You have a TON of room for O2, meaning you can run it a lot leaner. NOx peaks at 16:1, but they don't test that so you're free to lean it out. CO drops continuously as you lean it out, and HC's drop until you lean it to 17:1.

If you can program an output on your wideband, use the simulated narrowband output and shift it so its always ~1 AFR point leaner, then enable closed loop.

D16SohcVtec

I'm thinking my wideband might be off, but my narrowband stock O2 is new and my cat is also new they both probably have like 40 miles on them.

I'll go ahead and lean out the map also. I didn't quite understand what you meant about using the wideband to simulate a narrow band output and then shifting it 1 AFR point leaner? Sorry for imcompetance, still new at this sort of stuff. Thanks for your help though really appreciate it.

Ls_dx

iTrader: (5)

Lean it out like crazy. pass with flying colors. does it have a cat on it? sorry I didnt read everything/

912

you should have got it done illegally, i was in temecula cali last year brought an integra from georiga and passed smog with flyin colors, my buddy ran my vin and put a toyota corrola on machine and i passed

nonvtecD

Leaning it out "like crazy" will raise NoX. You need to lean it out, but not like crazy.

DOHC_16v

lean out the idle a bit and add more timing

Hybrid96EK

I don't think thats something I would post in a public forum. Your "buddy" might not be so much of your buddy when he gets his smog license pulled from him for illegal activity.

Got traction

interested to see how this pans out for you because ill be in the same boat shortly. i have a vitara'd y8 and might have to do smog in jan.

D16SohcVtec

I do have a cat, its a new carsound cat I'm just running stock exhaust for now. I'm going to be leaning it out to around 15.5 for idle and cruise and advance timing a bit. According to my emissions printout, they aren't testing for NOx. Just HC and CO.

D16SohcVtec

I tried again and failed again, I leaned my idle AFR to 15.3 - 15.8 and advance idle timing on my map 1 degree. It brought my HC's down from 413 to 260. I'm going to advance more timing and run that gurranteed to pass stuff and see if it'll pass this time.

D16SohcVtec

I tried again and failed, my HC for idle is still too high. About 40 over the limit. I pass everything else except for the idle portion. My AFR's are 14.7 idle and cruise. My idle timing is advanced 2.5 degress. I leaned my idle AFR to 15.6 and advance timing and still failed with the same amount of HC emissions on idle. Apparently the lowest I can get my idle HC as of current is 260.

I think the zex 59300 cam is causing me to fail the idle portion. It's either I remove the zex cam and run the stock cam or install another cat.

Hybrid96EK

Certainly possible. I don't believe that cam is labeled as carb exempt. I would yank it and put in the stock one. Doesn't take that long and costs a hell of a lot less then a new cat.

D16SohcVtec

The only problem is, I don't have a stock z6 cam.