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Here's what Brad helped us with!
Posted by 900 Areo [Email] (more from 900 Areo) on Thu, 17 Jul 2003 22:21:38
In Reply to: AMM Resistance mod? Could I have an explanation n/m, SAABOOST, Thu, 17 Jul 2003 08:35:33
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Resistor workaround for overboost-cut out. (‘89 to ’93 & ’94 commemorative edition / convertible Classic 900T’s and ’89 only 9000T’s) The ECU airflow from the AMM has a variable voltage. Adding a resistor drops the voltage range, fooling the ECU into thinking the motor is flowing less air than it really is, thereby preventing it from reaching the point set for over boost. But be aware that this also means the ECU will be delivering less fuel. IT WILL BE LEANER. So you need to go richer with larger fuel injectors to compensate. We recommend the larger 30 lb/hr red injectors and add ½ watt resistors as necessary to the orange wire in your 013 Air Mass Meter from 200 to 700 ohms. You can use different combinations of resistors in series or in parallel to fine tune with this method if you have an air-fuel ratio gauge. Otherwise just go with a lower resistance so as not to lean the mixture out too much!
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