Re: Question for Brad ...long.... - Saab Performance Bulletin Board - Saabnet.com
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Re: Question for Brad ...long....
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Posted by Brad [Email] (more from Brad) on Sun, 22 Dec 2002 20:52:59 Share Post by Email
In Reply to: Question for Brad ...long...., wlfbronco, Sun, 22 Dec 2002 19:57:09
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30# injectors will make it too rich with out one other modification and a little fine tuning. You need to add a 300ohm resitor in the output wire of the air mass meter. The output wire is the one that increase in voltage as the mass increases, check with voltmeter. This will get it close. Then addjust the airmass meter to get it just right at idle. If you use a digital voltmeter or air fuel ratio gauge on the O2 sensor will make the idle adjustment easier. You need to get the mixture at idle lean enough the the lamba is working. That is if it is an A/F meter it need to swing rich/lean not lock in either position. If it is a volt meter the voltage need to go up and down in a rythmic fashion. Using the 2.5 bar regulator is best to start with.
The adjustment in the air mass meter is not enough to bring the airmass meter in to correction. If you are running 17+psi of boost the air mass meter will be out of the picture by 4000rpm at that point the injectors are wide open. So you will use fuel pressure in adjust fuel mixture above 4000rpm at wide open throttle and the resistor to make the car drivable. The air mass meter adjustment will be for the small idle adjustment.
You may have to use a high resistor if you can not get the lamba to cycle. I have added as much as 450ohms. This can and does work but you must create a balance with your other modifications. No plug and play.
Brad
PS Michael might be back in town and he may add a little more detail to the amount of resistance he is using as he is using 30# injectors and has made his adjustments with my data logger.

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