I had to smog my cars this month so I took them both in today.
I started with the toyota, ('85 corolla) I figured if they passed that POS...
I didn't do anything special to either just warmed them up first.


__________________________%CO2___%02____________HC (PPM)_____
________ TEST____RPM______MEAS___MEAS______MAX___AVE___MEAS
Toyota:__15 mph__1825______14.41___0.63_______157____52_____46
Toyota:__25 mph__1847______14.37___0.61_______132____40_____39

GTA:____15 mph___1630______11.83___3.89_______108____31_____36
GTA:____25 mph___1590______12.89___2.33_______83_____20_____50


__________________CO%__________________________NO (PPM)_____
_________MAX_____AVE_____MEAS_________MAX_____AVE_____MEAS
Toyota:__0.93_____0.19_____0.00__________859______517_____0529
Toyota:__0.73_____0.14_____0.00__________740______430_____0505

GTA:_____0.71_____0.10_____0.09__________767______237_____0218
GTA:_____0.58_____0.09_____0.09__________706______199_____0194


I think they did just average, but it's fun to compare the numbers
I wonder if the higher O2 in the GTA is because it flows more air through it?
Also, am I allowed more leeway with the Toyota because it is a single cat and carbed?
Since they only put the sniffer in one exhaust, does my GTA actually put out as much smog as two Toyotas?

 

It's because the paint job on the GTA is so much nicer than the Toyota

 

Hi Julie!

To answer your question, you have to look at how they evaluate emissions. They use both % (percent) and PPM (Parts Per Million), so looking at your figures can lead to some confusion.

Since they are evaluating your emissions on a percentage basis, the GTA can be emitting a lower percentage of emissions, but a much higher volume of emissions and thus emitting a far larger amount of smog into the environment.

The analogy that comes to mind is that if you dump 10 gallons of 20% dirty water into the environment, vs dumping 1 gallon of 25% dirty water, even though the latter is in fact "dirtier" water, the former is emitting far more "bad" particles into the environment.

So, is 'Yota cleaner than the GTA? Percentage-wise, the GTA is cleaner. But for total emissions volume, the 'Yota is probably cleaner.

TA

 

Thanks for the replies!