Before reading anything a disclamer :- I dunno how petes work. I'm just guessing that he increases the injection duration by some fancy electronics.
In a Diesel Engine the government tests 5 factors for pollution NOx, Particulate matter, Carbon Monoxide, HydroCarbons and Free accelaration Smoke.
All the pollutants are measeured in gms/kWh while THe Smoke is Measured in Bosch units/ Hatrige units - which is actually a measure of the opacity of smoke.(means how black that is)
Since when a diesel goes for PUC certification-the yearly thing- only FAS (Free accelaration smoke) is measured- there is a torque limitation quantity map in the ECU which limits the injection duration and timing during hard accelaration.Actually the engine is capable of doing more but , to make the smoke not blacker the manufacturers have to limit it.
And there are people already telling that the black smoke increases with Petes. Which is sort of explained by the above.A better filter can help this marginally by putting more air and helping to burn off those extra fuel which comes as black soot- which transalates to even more power.
My hunch is that petes adds some more duration to ECU set- by (maybe) amplifying the voltage to the ECU. Slightly bad for the injector. bUt the manufacturer has now way to know how much was the injector actually injecting if Petes not messing with the quantity maps.If the map values were altered the manufacturer would come to know.
So what do I feel - I'd buy it - Care less about environment. I smoke anyway
.Now somebody sponsor me an Elantra CRDi. Tadu you listening??