Does your exhaust choke your engine?

[Hog]

Originally Posted by -=Jeff=-

That is a matter of personal preference, I think. my 89 was not bad, but I have cats on my 90 Z

You can always use gasoline that smells very attractive, Eau de Octane is a very enticing fragrance.

My Uncle has a US code Ferrari Testarossa, when our Province used the California style dyno sniffer test. he would take his car to a "guy" who installed cats and ran it through the cycle, thus passing. This would get his sticker for 2 years. Then we went to the OBD2 port testing and just uses a "cheater pipe". Not sure if he is running the non-cat European ECM calibration or not.

Not sure if it's an actual emission that makes that offputting smell or not.


Carbon Dioxide-CO2
Part 1 of a 3 way catalyst
CO2 is odourless, tasteless and is a greenhouse gas, allowing solar radiation to hit the Earths surface where the radiation heats the surface of the Earth, the surface then heats the air causing convection currents. Higher CO2 concentrations prevents the escape of thermal energy from the planet.


Oxides of Nitrogen-NOx Part 2
Oxides of Nitrogen is a blanket for many compounds
Nitric oxide, also known as nitrogen monoxide, (NO), nitrogen(II) oxide
Nitrogen dioxide (NO2), nitrogen(IV) oxide
Nitrous oxide (N2O), nitrogen(-I,III) oxide
Nitrosylazide (N4O), nitrogen(-I,0,I,II) oxide
Nitrate radical (NO3), nitrogen(VI) oxide
Dinitrogen trioxide (N2O3), nitrogen(II,IV) oxide
Dinitrogen tetroxide (N2O4), nitrogen(IV) oxide
Dinitrogen pentoxide (N2O5), nitrogen(V) oxide
Trinitramide (N(NO2)3), nitrogen(0,IV) oxide


Hydrocarbons
And the last part of a 3 way cat, the Hydrocarbons, perhaps its the burned or partially burned hydrocarbons that give off that smell.

I found this little ditty about Hydrocarbon emission classification(wiki)
Technology for one application (to meet a non-methane hydrocarbon standard) may not be suitable for use in an application that has to meet a total hydrocarbon standard. Methane is not directly toxic, but is more difficult to break down in a catalytic converter, so in effect a "non-methane hydrocarbon" regulation can be considered easier to meet. Since methane is a greenhouse gas, interest is rising in how to eliminate emissions of it.


I remember in about 91-94 the GM TBI(throttle body injection) engines used catalytic converters which caused a strong "rotten eggs" smell. That indicates some sort of Hydrogen Sulphide (H2S).

Did any of the ZR-1's suffer from any "rotten eggs" smells?