Calling all Code 1100 order holders
Melting Slicks
Joined: Sep 2013
Posts: 2,299
Likes: 466
From: Long Island New York
One thing I wonder, is whether GM needs to keep Z51 at 49% or less total for the year for CAFE reasons? The EPA mileage rating was done with the C7 Base because it must be done with the majority sales model and those models have taller gearing for mileage reasons. If GM produces 55% Z51, how would that affect CAFE?
Melting Slicks
Joined: May 2011
Posts: 2,072
Likes: 462
From: Lincoln, CA.
One thing I wonder, is whether GM needs to keep Z51 at 49% or less total for the year for CAFE reasons? The EPA mileage rating was done with the C7 Base because it must be done with the majority sales model and those models have taller gearing for mileage reasons. If GM produces 55% Z51, how would that affect CAFE?
Team Owner
Joined: Aug 2007
Posts: 136,140
Likes: 2,432
From: I live my life by 2 rules. 1) Never share everything you know. 2)
St. Jude Donor '11-'12-'13, '16-'17-'18
CAFE standards are averaged across the entire line of vehicles of a manufacturer not just a particular one and its derivatives.
As such, I would tend to doubt that the Z51 alone would significantly affect that average
As such, I would tend to doubt that the Z51 alone would significantly affect that average
Melting Slicks
Joined: Sep 2013
Posts: 2,299
Likes: 466
From: Long Island New York
Automakers are fighting for 1/10th of 1 mpg on CAFE, so if it affects it even 0.01 mpg they will do it.
Safety Car
Joined: Jul 2001
Posts: 4,661
Likes: 67
From: Ocean Springs MS
They did it during the C5 run, constraining the Z51 with the A4, as it changed the rear end from a 2.73 to a 3.15. They also constrained the Performance Axle (3.15), as a stand alone option. It was done purely for CAFE reasons. The Z51 with the M6 was not constrained, because it had no gearing changes.
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