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Re: Red #431 injectors
Posted by 900 Aero [Email] (# 425) [Profile/Gallery] (more from 900 Aero) on Fri, 14 Oct 2011 20:39:49
In Reply to: Re: Red #431 injectors, Roger D [Profile/Gallery] , Fri, 14 Oct 2011 18:56:41

Hi Roger, yes but you have to deal with correcting the air/fuel ratio one way or another! I use my own fully adjustable fuel pressure regulator to accomplish this but it requires a wide band air/fuel ratio gauge/extra 02 sensor and a fuel pressure gauge and or a chassis dyno! Most everyone here has gone the reprogrammed eprom route like lms mentioned especially when Jak Stoll had his available that worked great! Over the years there have been lots of clever ways to run these 33.9 lbs per hr injectors without a reprogrammed chip but it was easier with the pre-'89 cars where the adjustable air mass meter could easily be leaned out. On the '89 up cars Brad a KC Saab devised a trick to fool the nonadjustable air mass meter with resisters on the orange AMM wire which also worked great. Other companies sell the same flow rate of red injector with a fuel chip to take care of the air/fuel ratio but I don't have any first hand experience with any of them. The injectors these other companies sell for our early Saab's are 30 lbs per hr Ford Motor Sports injectors that flow 30 lbs per hr at 2.7 bar which flow exactly the same as the 33.9 lbs per ones flow when a 3.0 bar fuel pressure regulator is used but they don't have the improved spray pattern most injectors use now days however I've used both in my cars and can't tell any difference between the two!
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