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Old 05-20-2012, 09:43 PM   #11 (permalink)
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Apparently I'm a lot clearer in my own head than in type. WHAT changes made to this engine series allow for no EGR? Valve timing and overlap? Fuel mapping? And HOW?

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Old 05-20-2012, 11:02 PM   #12 (permalink)
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Old 05-21-2012, 08:04 AM   #13 (permalink)
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Originally Posted by MosersMopars View Post
Apparently I'm a lot clearer in my own head than in type. WHAT changes made to this engine series allow for no EGR? Valve timing and overlap? Fuel mapping? And HOW?
The engines weren't made more efficient or cleaner, they were given a classification that dodged those requirements. It was a paperwork shuffle, kind of like classifying the Neon wagon (PT Cruiser) as a truck for CAFE purposes. The HD rating was probably a CAFE dodge as well, because the heavy duty trucks didn't have to post mileage ratings (it's a work truck, not a highway cruiser).
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Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

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Old 05-22-2012, 12:07 AM   #14 (permalink)
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i thought it had to do with the cam, but the only thing i can find is something to do with pcm
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Old 05-29-2012, 05:39 AM   #15 (permalink)
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best explanation i can find

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