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safc and safr, not good ideas Posted by Kevin K [Email]  (#374) [Profile/Gallery]
(more from Kevin K) on Sat, 30 Aug 2003 08:54:38
In Reply to: Your thoughts please (a/f ratio, 91 SPG), Andy E, Fri, 29 Aug 2003 11:58:50 Members do not see ads below this line. - Help Keep This Site Online - Signup |
these are basicially rpm based corrections, and will give % corrections to maf volts that don't give same % correction in fuel flow, since the calibration curve is very non-linear.
ecu is matched to maf. jak had right idea with using a system designed for 30# inj's, vs usual barbaric mods to c900 fuel.
once the maf is near maxed and duty cycle hits saturation, fuel flow will peak, even though more flow is need for more hp at higher rpms.
with stock ecu and amm, the linked calibrator can all 3x# inj'rs with proper corrections to the amm output. 1st you need to get stock amm flow calibrated, then make a target curve for say 30% less flow at ea voltage point. Then you make your correction table for in vs out volts.
table is same for ea rpm up to about 4000, where a stock maf flatlines with high hp mods. At this point, the amm may read 5V, and the corrected value is 4.1V. Higher rpm tables can have progressively higher corrected 'max' volts to compensate, like 5 gets u 4.5 at 5k, and 5 gets u 4.9 at 6k rpm.
could use same concept with larger amm (mustang 55-70mm), but would need that calibration curve too, and hopefully have an idle trim screw although the tables should allow complete adjustment.
sample curve
http://www.flash.net/~rfm2/massair.htm
posted by 165.121.88...
, Sat, 30 Aug 2003 08:54:38 <-- Viewing This Message
, Sat, 30 Aug 2003 07:10:25
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