Supercharger vs. N/A build!

[Cobrat24]

Originally Posted by twobjshelbys

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.

Hey Tony,

To answer you on the elevation question, yes the car has been rejetted. The car just doesn't make enough power for my wants and needs. While we all were bringing up which direction to go on the motor, carb vs FI became a concern because of the elevation changes occasionally thru the year.

To your point I hate the idea of rejetting on the fly if I want to go to Tahoe or Auburn Ca. I think it's becoming painfully apparent that whether I go blower or cu build, FI will need to be considered.