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Discussion Starter #1
Anyone have any suggestions for baseline SFC settings? I have a pyrometer to use as somewhat of a guide and will eventually get to a dyno. I just wanted to take a small amount of fuel out but still be safe. I'm at BPU with fmic, exh. cam gear, ud pulleys, but no VPC. Would it be safe to take out 4% fuel from 3k -7k even in 30-40 deg. weather. It seems like my car leans out and runs pretty hard in the cold air w/o the fuel controller. Anyone have any conservative recomendations?
 

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Discussion Starter #2
Any suggestions, c'mon I won't sue anybody.
 

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Discussion Starter #3
^^^
 

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Discussion Starter #4
ttt
 

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I would recommend setting it at 0 across the board until you get to the dyno. :) You setting will vary depending on if the car is OBDI or OBDII. On my OBDI cars I have seen A/F ratios as high as 12.5:1 with only a 4% reduction on the S-AFC.

Later, Steve
 

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Discussion Starter #6
Steve Jarvis said:
I would recommend setting it at 0 across the board until you get to the dyno. :) You setting will vary depending on if the car is OBDI or OBDII. On my OBDI cars I have seen A/F ratios as high as 12.5:1 with only a 4% reduction on the S-AFC.

Later, Steve
It's OBD1 so thanks Steve. I think it runs so much harder in cold dense air too that I couldn't get much out of it right now anyway. I think it has a natural tendency to lean out when it gets cold outside. When running with 94 octane at 0 across the board with no problems would it make sense to take out 4% across the board with 104 octane or any amount of fuel out?
 

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Discussion Starter #7
^^^
 

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Rviscosi,

The car runs better in the cold because of the cool dense air and because your boost tends to go up slightly when it's cold. If you still have a stock intercooler (which I doubt since you have BPU+ in your sig), then you will gain power on cold days because the intercooler won't heat soak as bad. It has nothing to do with your a/f ratio. Your MAF and ECU should be giving you the same a/f ratio regarless of outside temps. I wouldn't mess with the S-AFC until you get to a dyno and wideband O2. I only used -2% at the top RPM's to maintain a 12.0:1 a/f ratio.

Hope this helps, Steve
 

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Discussion Starter #9
Thanks again Steve.
 
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