i converted my car to tpi i do my own prom tuning, there is no emission devices what so ever on this car, of course i failed emissions.

with my old carb

HC Limit 100 i had 425
CO Limit 0.62 i had 0.68
NOx limit 700 i had 924

my current setup

HC Limit 100 i had 20
CO Limit 0.62 i had 0.68 again
NOx limit 700 same 924

i had a gutted catalytic converter on the car, i installed a magnaflow catalytic converter with no air pipe, is it safe to assume that the car will lower the CO and NOx?

 

It should but with out the air hooked up it will take a little while for the converter to completely warm up before its starts working prpperly. I SUGGEST A GOOD HIGHWAY RUN BEFORE GOING BACK THROUGH.

 

High NOx levels are caused by high cylinder temperatures, a catalytic converter WILL not solve this problem. You stated above that the car is missing emissions control devices. The EGR system lowers NOx emissions by intruducing inert exhaust gas to the combustion process which will by nature allow the cylinder to cool. THIS is the only way that i know of to lower NOx emissions. Also, without a properly functioning AIR (air injection reaction) system it is possible to pass emissions but all the pump really does is introduce oxygen to the exhaust stream inside of the catalyst to chemically alter dangerous CO (carbon monoxide) into a potentially less hazardous CO2 (carbon dioxide). Although todays catalysts are much more efficient than when these cars were new it is forseeable that the car may pass emissions for CO without a properly functioning AIR system (as stated above). What type of emissions testing do you have in your area? You typed your emissions levels which were found on your VIR report after inspection. This denotes to me that you recieved either the dyno (ASM) test or the Two-Speed Idle (TSI) test. Also, in addition to your emissions level tests and depending on the area that you live in you may also be subject to a visual anti-tampering inspection. You will not pass this portion of the test with missing or damaged equipment. Hope that can help. -Bob