 July 9, 2019 Charlie Fish Show We did a little more 7.3 injector testing on Zac Bolen'struck... Results were a little surprising. Truck is a 1999 F250 7.3 with irate t4 BASB turbo. 17 degree hpop. It is a dedicated tow rig that hauls heavy loads all over the country. Upwards of 30k lbs going up big grades in elevation. He was running FF 160/100s, made good power, towed well, but struggled a little with egts while towing heavy and had an issue where it would run into icp/oil issues while towing really heavy at 3/4 throttle going up really long grades... we are pretty sure it was sucking the hpop oil reservoir dry. Very oil hungry injectors. Even on a 3.6ms tune ICP would drop to about 2700psi. He decided to try some FF 205/30 hybrids injectors. Truck runs WAY cleaner, cooler, much easier to tow with, no more issues with sucking the oil reservoir dry. Very linear power band. EGTs are down 150-200 all across the board while towing and gained MPG. Holds a ROCK SOLID 3200icp at WOT. BUT... lost a little "oomph" down low under low throttle conditions, and top end power is down a little. On the dyno the 205/30 brought on the power sooner, made more peak tq tq, ran cleaner, and made the same HP as the 160/100 up until 2500rpms where the power fell flat on the 205/30 and kept climbing with the 160/100... even though ICP was dropping like a rock with the 160/100s So... why does it run so much cooler/cleaner and bring on the tq sooner? Smaller nozzles or hybrids? When we tested 180/30 vs 205/30, the 180/30 brought the power on sooner, not the hybrid. So I am going to say it is the smaller nozzle. Which makes sense because the smaller nozzle is known for better atomization and will spray the fuel farther into the stroke which increases tq. Next on the list.... 238/80s... it will be interesting to see how they all compare. Joined
Aug 27, 2013 · 404 Posts
Discussion Starter · #1 ·
Nov 17, 2013 I just wanted to get your input on which do you prefer, and why? I know that single shot is better than splits for power and mpg. I know that singles use 6:1 and less oil than split shots, and hybrids use 5:1 and the least oil. I was curious as to wouldn't singles be better with 6:1 injection pressure than 5:1 in terms of efficiency and clean power? I
have been told that even the split shots which are 7:1 can only provide that kind of injection pressure under the best of conditions, which is probably idle unless your using bigger oil. So, are hybrids just better overall, smokier at idle? Come alive and hold better power and efficiency under rpms? Just trying to get a hold on this and what to go with when its time for injectors. Im looking for power, not sacrificing mpg's too much. I have a pmr engine now, have a forged rod waiting to go in
the truck, thinking big injectors detuned for pmr engine then wake them up when they go into the forged block.. thoughts... any experience on this? thanks very much Joined Oct 24, 2011 · 6,107 Posts
im going to get smaller hybrids that way i dont have to upgrade my hpop and trans, hopefully lease: somewhere around the 200cc range. and have them detuned until i have everything else in order. if you are going to get bigger stage 2's then just get smaller hybrids...or bigger if you want. and smoke output really has to do
with the tuning and supporting mods being taken care of. Joined May 15, 2013 · 141 Posts
what is the difference between hybrids and single shots. i do know the difference between single and split shots but i dont know how hybrids work Joined Oct 24, 2011 · 6,107 Posts
hybrids are still single shots the body of the injector is from the international i530 or dt466 if i remember correctly. hybrids use less high pressure oil than single shots. and split shots use a ton of high pressure oil. What year 7.3 has split shot injectors?Single-Shot: For emissions purposes, 7.3Ls built for sale in California after April of 1996 came standard with split-shot injectors (AB codes as opposed to AA), which flowed approximately 130 cc of fuel (on a 1,000-count test).
Is the number 8 injector different on a 7.3 Powerstroke?The injectors in the 7.3L diesel run off of the high-pressure engine oil pump. The number 8 injector is the farthest away from the oil pump, causing a filling problem, which may result in a misfire. Ford replaced the number 8 injector in some vehicles as needed with a different injector to solve the problem.
How many injectors does a 7.3 Powerstroke have?Usually, there is one fuel injector in each cylinder. Since the introduction of the 7.3L Ford Powerstroke in 1994, injectors have been commonly relying on oil pressure to fire the piston via the HEUI fuel system.
How does 7.3 injector work?The 7.3L utilizes Hydraulically actuated Electronically controlled Unit Injectors, commonly referred to as HEUI or “HUEY” injectors. These injectors utilize high pressure oil which is controlled by a poppet valve inside the injector to achieve injection pressures of up to 21,000 psi.
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7.3 hybrid injectors vs single shot
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