Quote:
Originally Posted by Piotrsko
JSH: my Golf has lower compression than your avatar, and it makes less NOX comparatively for it's size.
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Yes, a Golf pollutes less than a Class 8 truck. A Golf also doesn't need to pull 80,000 lbs.
Things haven't been static that the HD sector.
The NOx standard has decreased from 6.0 grams per brake horsepower hour in 1990 to 0.20 grams per brake horsepower hour standard in 2010. In 2024 it drops to 0.05 grams and then to 0.02 grams in 2027.
For PM, the standard decreased from 0.6 g/bhp-hr in 1990 to 0.01 g/bhp-hr in 2010. PM drops to 0.005 g/bhp-hr in 2024.
Expect to seem some interesting solutions to meet those standards
This why CARB is targeting HD trucks:
Quote:
Originally Posted by Piotrsko
Vw got stuck in a spot where they couldn't compete with gasoline powered NOX standards applied to their diesel engines instead of the appropriate diesel specs they were aiming for.
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VW got stuck in a spot where they decided to cheat instead of meeting emissions requirements. Regulators around the world have stopped writing special emission rules for diesels. We have almost got to the point where there is one set of rules for all vehicles regardless of fuel type.
Quote:
Originally Posted by Piotrsko
The brouhaha ended with Cali giving them an exemption to "pollute" more in fewer cars. My golf emission is still cleaner than the same year suburu WRX.
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That isn't quite how things work. Both CARB and EPA standards are base on fleet averages. Vehicles are certified into different bins (EPA) or tiers (CARB) based on their emission certifications. Then there is a fleet average that steadily tightens over time. So yes, CARB allows VW to make some Golf TDIs that are dirtier than average as long as they make enough other cars that are cleaner than average to make up for it. They do the same with Subaru and the WRX.
You can find way more info than you likely want here:
https://dieselnet.com/standards/#na