3/27/2021 0 Comments 25317628 Fuel Injector Data Sheet
Can anyone tell me for certain exactly which flow rate these injectors are Im hoping to find someone who has verified that this is the injector part number that came in their car, and they have a read of their stock PCM tune.You should be able to find a tune with proper numbers in the repository.Googling these injectors endlessy, I found similar references rating these injectors between 22 and 42 psi and everywhere inbetween.
From what I can tell, 2000 trucks took 24.8, 02-03 trucks took 25.2, and 04-05 trucks took 24.5. But thats just by looking at about 15 different tunes. Plus, these numbers are so close (as is the other injector data) that the truck runs decently with the 24.5 or 25.2 injector specs (all, not just flow rate). Best would be to find an owner who definitely had this part injector in his truck stock, and did a stock PCM read. None of the PCMs with 6 liters I looked at had 22.1 injector flow rates in them. The turbo kit is a little large for this engine and takes a while for it to spool up. You are removing the pintle cap to increase flow through the injector. The factory uses pintle caps to restrict the flow of injectors and to help flow match injectors. By removing the pintle caps you are unrestricting the flow through the injector. Because of this modification their may be flow variance between injectors. This is due to the fact that before the stock pintle cap was the fuel flow equalizer through the fuel injector from the factory and now after decapping the fuel injector, the only thing that is now making the injectors flow the same is the factory machining tolerances within the injector. Because of this, it is HIGHLY RECOMMENDED that you send your fuel injectors out for flow testing, and also that you keep a eye on your spark plugs to see how the AFRs are looking cylinder to cylinder. If you have a spark plug that looks like its noticeably richer or leaner than other cylinders, I recommend modifying another factory stock fuel injector of the same flow rate and part number, having it flow tested, swapping the problem injector out and testing again. In this photo you can see the dark ring inside the black fuel injector O-ring retainer. This is the friction weld that holds the pintle cap onto the injector. So heres a visual reference of the pintle cap half off the injector And then heres the pintle cap completely off the fuel injector The part you see in the middle of the completely decapped fuel injector is the pintle. DO NOT TOUCH THIS WITH A GRINDER, YOU WILL RUIN THE INJECTOR You just want to grind off the friction weld that holds the pintle cap on and nothing more. So that is how you modify your fuel injectors to flow more fuel, now heres the proof this works. I (Dale Follett) Did this to a set of Delphi 25lbhr fuel injectors from a junkyard LM7 5.3L. The injector part number is 25320288. I modified 8 of them and then sent one out for flow testing to witchhunter.com so I would have data to use in my megasquirts tune. Here are the returned test results: So from these test results, we can see at 43.5psi the fuel injector flowed 583ccmin. Using witchhunter.com s online calculator I converted that to LBHR. LBHR of fuel flow at 43.5psi. Now for us LS engine guys, our factory fuel rail pressure is 58psi, so I used witchhunter.com s calculator again to convert that flow number to 58psi and came back with the flow number of 64 LBHR at 58psi of fuel pressure. This means this particular modified fuel injector flows 256 more fuel than it did in factory form. I HIGHLY recommend sending all of your fuel injectors out for flow testing to see where you stand with your modified fuel injectors. As I stated, I just flow tested one and have been keeping a eye on my spark plugs, with good results. EDIT 2-26-17, Just send all your fuel injectors out for flow testing so you know where you stand with your injectors. Ive been getting a few injectors that are frozen up or fail a leak check from the junkyard, so for peace of mind and so you dont wound a engine, just send all your injectors out for flow testing or build a rig to flow test them from home. I am currently running these particular modified fuel injectors in my pontiac firebird. The setup currently as of 7-18-16 consists of a BONE STOCK junkyard 4.8L LS, 4L80E transmission with a factory unknown vehicle junkyard 1700rpm stall converter and 2.73 rear axle gears. The vehicle is twin turbocharged using 2 different sized turbochargers from the junkyard.
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