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Old 12-19-2000, 04:58 PM   #1
Matt Monson
Scooby Guru
Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
99 2.5RS, '85 911
'73 914 and 2012 BRZ

Question AFC to improve fuel economy on MY00?

So I'm posting this here cuz you local guys often seem a little bit more open to commenting on "out of the ordinary" posts, so please forgive it not being in another forum...Or flame me if that is your inclination. :P
Anyways, I'm thinking about getting an AFC. Yes I know what one is, yes I know what it does. I also know that a mildly modded MY00 like mine (disassembled stock itake w/K&N and Stromung Cat Back) runs rich down low and a little lean cruising the highway.
And, that the HP gains at my current state of build up would be minimal.

So, heres my dilemna. Since my mods, I get 19-21mpg on my daily commute from Berkeley to SF. I used to get 23-25! So, with an AFC I figure I could lean it out a bit down low, since I rarely get above 3500rpm in traffic and increase my MPG. The AFC would pay for itself in a few months. And then of course when I actually needed an AFC for more serious engine management I would have one and already know how to tune it.
What do you think? Is my logic flawed or am I missing something?
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Old 12-19-2000, 10:47 PM   #2
P.K. Motorsports
Scooby Specialist
Member#: 1110
Join Date: Mar 2000
Location: USA
1999 RS


The effects of the AFC are completely nullified by the engine computer in all but open loop operation. Thus you won't see any increases in fuel economy, unless of course you are spending a lot of time at WOT.

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