How to flow test Injectors
 

Is there any fairly quick and easy way to flow test injectors on your own? Is it as easy as hooking up a voltage to the injectors and measuring the fuel they flow over a period of seconds, and then dividing? Reason being, I sold a set of S4 Turbo 550cc injectors on Ebay. The guy got them, and just by looking at them tells me that they are not 550cc, but 460cc N/A injectors. These injectors came out of my 88 Turbo2, and I know they are 550s, and it pisses me off that he is basically calling me a liar, and may leave me negative feedback (Im getting really fed-up with some Ebay buyers in general...) Anyway, I wanted to give him a quick and easy way to tell, but wasnt exactly sure how to hook power to the injectors, being they are pulsed while in the car.

Maybe this might help prove it to him
http://www.rotaryresurrection.com/ro.../injector.html

Maybe this might help prove it to him
http://www.rotaryresurrection.com/ro.../injector.html

look at the number on the side

flow testing as described would be barely accurate to find difference between 460's and 550's

but question if they are 550 or 460 should be solved by looking at part number on injector itself

Year type impedance plug style plug notch position flow rating color part number

84-85 13B NT low square center 680cc orange 195500-0900
86-87 13B NT low square center 460cc red 195500-1350
86-87 13B T low square center 550cc tan 195500-1370
88 13B NT high square offset 460cc purple 195500-1350
88 13b T high square offset 550cc purple 195500-1370
89-91 13B NT high oval center 460cc red 195500-2010
89-91 13B T high oval center 550cc purple 195500-2020

The FSM describes this. You get a measuring cup (from walmart. Keep in mind mL is the same as cc. Use an old injector plug, and a battery. Watching the seconds on your watch, turn on the fuel pump and trigger the injector...measure output for 30 seconds, multiply the output by 2.

Cool, thanks guys, I completely forgot about the part number thing :dunce: