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Old 08-07-2006, 09:31 AM   #3
RIP 10/12/83 to 02/10/08
Scooby Specialist
Member#: 83254
Join Date: Mar 2005
Chapter/Region: NWIC
Location: Roy, Washington
98 2.5 RS
04 WRX


Originally Posted by G.Subramaniam
Am I correct in assuming that since Turbo cars need a rich Fuel mix, they need to run AFR around 11, vs NA cars that can run around 14
This should make NA cars much more fuel efficient
First, turbo cars can run 14.7 (stoic) just as much as a N/A car. Its not the AFRs that make them inefficient, its that they have a exhaust restriction (turbo) and run a low compression ratio.

An all out N/A car will run around a 12-13 AFR anyway, thats not much better than a Turbo car either. But that is full throttle, which you shouldn't be doing if you are worrying about fuel efficiency.

What Red Devil said was right though.
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