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Well, info on the “final” rule is available today – all 1100+ pages of it. The official Federal Register version (hopefully shorter) hasn’t been published yet, don’t know when that will happen so we can see the “official” version on what the phase-in periods are, exact target numbers, etc.
Final Rule: Multi-Pollutant Emissions Standards for Model Years 2027 and Later Light-Duty and Medium-Duty Vehicles | US EPA
Multi-Pollutant Emissions Standards for Model Years 2027 and Later Light-Duty and Medium-Duty Vehicles – Final Rule (March 2024) (epa.gov)
When I read the ‘proposed’ rule from May 2023 (2023-07974.pdf (govinfo.gov) a couple of things stood out:
#1 - EPA originally wanted to eliminate/prohibit use of “commanded fuel enrichment”. That’s a really big deal for ICE vehicles as we now know them. It sure would have made MY2027 SAE J2807 testing “interesting” and Ford’s 2027 Ford Towing Guide pretty jaw-dropping for all the wrong reasons. Tuners wouldn’t be too happy either. Here’s what EPA wanted:
EPA solicited comments from industry. US automakers and industry groups threw a major shoe when they saw this. I’ve read the comments back to EPA from Ford, Stellantis, Alliance for Automotive Innovation (AAI - industry group that represents car companies – their response was the most detailed). GM responded but their comments seem to have all been in attachments which were redacted.
When Ford replied to the EPA on eliminating fuel enrichment, they basically wanted to delay implementation to MY2030 for vehicles above 6000# GVWR.
Here’s what EPA now (20 March 2024) says (basically no prohibition now but may happen in 2-3 years):
And:
#2 – Gasoline particulate filters (GPF’s). The automakers and AAI pushed back on the ‘new’ 0.5 mg/mile PM standard phase-in period, and on the requirement for a new PM test at -7 degrees C., and on the ‘new’ OBD requirements that EPA proposed in May 2023.
AAI had a lot to say on this (too much to cut & paste). Ford wanted to delay implementation of the 0.5 mg/mile requirement until 2029:
In the final rule, the new 0.5 mg/mile PM standard is codified (which effectively will require GPF’s), as is the ‘new’ -7 degrees C. PM test. I’m still not sure what the official implementation period will be.
So we’ll see what the future brings.
Final Rule: Multi-Pollutant Emissions Standards for Model Years 2027 and Later Light-Duty and Medium-Duty Vehicles | US EPA
Multi-Pollutant Emissions Standards for Model Years 2027 and Later Light-Duty and Medium-Duty Vehicles – Final Rule (March 2024) (epa.gov)
When I read the ‘proposed’ rule from May 2023 (2023-07974.pdf (govinfo.gov) a couple of things stood out:
#1 - EPA originally wanted to eliminate/prohibit use of “commanded fuel enrichment”. That’s a really big deal for ICE vehicles as we now know them. It sure would have made MY2027 SAE J2807 testing “interesting” and Ford’s 2027 Ford Towing Guide pretty jaw-dropping for all the wrong reasons. Tuners wouldn’t be too happy either. Here’s what EPA wanted:
EPA solicited comments from industry. US automakers and industry groups threw a major shoe when they saw this. I’ve read the comments back to EPA from Ford, Stellantis, Alliance for Automotive Innovation (AAI - industry group that represents car companies – their response was the most detailed). GM responded but their comments seem to have all been in attachments which were redacted.
When Ford replied to the EPA on eliminating fuel enrichment, they basically wanted to delay implementation to MY2030 for vehicles above 6000# GVWR.
Here’s what EPA now (20 March 2024) says (basically no prohibition now but may happen in 2-3 years):
And:
#2 – Gasoline particulate filters (GPF’s). The automakers and AAI pushed back on the ‘new’ 0.5 mg/mile PM standard phase-in period, and on the requirement for a new PM test at -7 degrees C., and on the ‘new’ OBD requirements that EPA proposed in May 2023.
AAI had a lot to say on this (too much to cut & paste). Ford wanted to delay implementation of the 0.5 mg/mile requirement until 2029:
In the final rule, the new 0.5 mg/mile PM standard is codified (which effectively will require GPF’s), as is the ‘new’ -7 degrees C. PM test. I’m still not sure what the official implementation period will be.
So we’ll see what the future brings.
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