so today i took my car to get smog tested and i failed due to NOx.


NOx PPM max is 490 at 15mph - i tested at 806
NOx PPM max is 511 at 25mph - i tested at 962


so my question is this... is the .5 increase in compression in the JDM F22B compared to the USDM F22B2 enough to almost double the maximum limit for NOx emission??

any input is appreciated. thanks.

PS. I'VE CHECKED 02 SENSOR, CAT, AND MY EGR.

 

Have you checked to see if your EGR ports are clogged?
http://www.freewebs.com/hondadude/95...5AccordEGR.htm
http://home.comcast.net/~em-engineering/T2T013.pdf
As seen in the FAQ stickied to the top of the page.

 

How did you check the Catalytic Coverter?

How did you check the EGR?

 

cat - checked back pressure.

egr - push diaphragm to see if engine stalls - vacuum gauge connected n tested at partial throttle n checked vacuum.

can anyone answer my Q?? will .5 compression ratio increase raise my NOx levels by almost double?

 

Back pressure isn't a measure of a catalytic converters efficiency.

 

ok but im ruling out cat as a problem because my CO2 and H2O (SHOWS HOW EFFICIENT MY CAT IS WORKING???????) are within the right specs. CO2 AND H2O only created from stripping the OXYGEN off of NOx so if CO2 AND H2O are within good specs it means my CAT is doing a efficient job of stripping off the OXYGEN off of NOX and creating clean exhaust.

and i do believe higher back pressure leads to NOx because higher the pressure within the exhaust system more heat is generated and NOx is created under extreme heat.

i am only having problem with controlling my NOx emissions... my CO2 AND H2O are in good specs.

i dont know if your trying to be a douche questioning me on how i've done my tests but it doesnt answer my question.

i jus need to know if the .5 compression increase in the jdm f22b compared to usdm f22b2 enough to almost double my nox emission.

 

No problem. I'll step out of this thread and maybe see if a Honda Master Technician can give some input. Good luck.

 

Actually it did, chansta ditch the shitty attitude. Check your rhodium levels and get back to us.*that's called being thrown a bone*
I LOL'd.

 

retard the timing a tad.

 

no hard feelings i just felt like just because your mastertech you're doubting everyones ability to diagnose.

i dont know how im supposed to check my rhodium levels... and where did anyone answer my question? i dont mean to be a douche but i dont see it anywhere.


timing specs are 15 +/- 2 and i've set my timing at 13btdc so i can't retard timing any further : /

only thing i can think of is running higher octane fuel.

 

Just about any well tuned car can pass the CO/HC part of the emissions test without a converter. CO/HC are at their lowest near stoich. NOx on the other hand is on the rise if not near peak.
Had you been listening to what phootbag was saying you would have realized that back pressure does not correlate with how efficient the chemical reaction of the catalyst inside the converter is. They can fail physically(from excessive heat causing a meltdowm/external physical damage) or chemically(through poisoning).
Platinum, Palladium, and Rhodium chemically scrub the exhaust. If for whatever reason the cat becomes poisoned it can no longer function. Failure in this manner will not effect exhaust flow. A properly working EGR and Catalyst can reduce NOx by ~75%.

Your beliefs in how the emission system functions is incorrect. NOx is created from a combination of heat and pressure in the combustion chamber.

.5 CR raise will not make your car a gross polluter. A bad tune and poisoned cat will.