01-04-2016, 02:00 PM
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CC Member
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Join Date: Jan 2009
Location: Las Vegas,
NV
Cobra Make, Engine: Shelby CSX4005LA, Roush 427IR
Posts: 5,635
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Not Ranked
Sometimes the obvious things are overlooked so I'll ask...
Have you rejetted and adjusted your carb for high altitude operation?
I deliberately got fuel injection for mine (I lived in northern Boulder County, 5500', but had frequent operation above 10000' (especially when going over Trail Ridge, admittedly not a normal operating condition). A well designed DFI certainly helps these conditions, but a friend with the same engine - the Roush 427R (mine was IR for fuel injection) - in his GT40 ran great in the altitude band from about 5000-8000.
As an anecdote when I was "a kid" and we went from Iowa to Colorado, etc. my dad always had the carb reconfigured for high altitude. Another friend who ran carbs and took his car to sea level had two carbs and swapped them.
__________________
Cheers,
Tony
CSX4005LA
Last edited by twobjshelbys; 01-04-2016 at 02:15 PM..
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