Why resistor - Saab 900 Bulletin Board - Saabnet.com
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Why resistor
Posted by Dave D (more from Dave D) on Thu, 26 Dec 2002 22:49:40
In Reply to: Resistor for AMM?, Jon W, Thu, 26 Dec 2002 13:57:27
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Hi Jon,
The resistor is for high boost applications where one has upgraded to 30#/hr injectors. The 30# injectors actually make the car a bit rich up to about 4600 RPM by which point the injectors are at 100%, the resistance decreases the voltage of the signal to the ECU making the ECU think there is less air than there is so that it squirts less fuel. On my 90 SPG running 20#s of boost, even with the 300 ohm resistor I am a bit rich (air/fuel ratio is 11:1 from 2000-4500 RPM). The other benefit is that it defeats the overboost protection on an LH2.4 system.
To my knowledge, this trick was pioneered by Brad at George's Imports.
Dave D
90 SPG
posted by 69.3.75...
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