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Message: [QUOTE="mikeeg02, post: 1395520, member: 24194"] Ultimately in my opinion, that answer needs to come from your injector builder or similar. In my opinion (and I don't have a flow bench to test so these are my observations and understandings, and most of it is in injector theory) Hybrids Less HPO per cc fuel If you can maintain 3,000 psi HPO (at a 5:1 hydraulic ratio) you achieve ~15,000 psi injection pressure. (There are several other factors that go into that, but let's baseline) A codes Requires additional HPO per cc fuel If you can maintain 3,000 psi HPO (at a 7:1 hydraulic ratio) you achieve ~21,000 psi injection pressure. (There are several other factors that go into that, but again let's baseline) That being said, you should only need about 2150 psi HPO to achieve ~15,000 psi injection pressure (There are several other factors that go into that, but let's baseline) When I was interested in a similar injector (175/80s), I thought I was planning ahead and doing the T500 and I would be able to support 175/80s, but like I said before, people with similar setups didnt seem to be able to provide hard data showing me a T500 (or adrenaline for that matter) would fully support (and to me that means 2800 psi or better HPO with an A code) In my opinion, if you dont have enough oil to run 175/80 A codes, you should be able to get a 200/80, 238/80, 250/80 hybrid (lets retain the nozzle size) and detune them to a approximately 175cc, and definitely be able to maintain 3,000 psi + HPO. At which point making the hybrid overall cleaner and more efficient at the same power level. And I cannot understand for the life of me anyone would suggest a 200/80 over a 238/80 or 250/80. Because they are basically the same price, and a 238 or 250 can be tuned to only use ~200 CC or fuel, or even less. One gives you a future if you get the HP bug later, and one gives you a max of ~200cc's of fuel. Maybe thats enough, and maybe that isnt. But I certainly wouldnt suggest such a small hybrid, dollar for dollar. [B]But again, thats MY opinion, and I am certain there is alot about injectors I do NOT know or understand.[/B] There also used to be a lot of talk on injector oil refill time, and maybe we are passed that now. But the A codes require more oil per cc of fuel, so every shot they require a certain amount of time to refill the oil side. If you cannot refill it to its capacity, your 7:1 hydraulic action of that next shot goes to sh!t. This problem would get increasingly noticeable in higher RPMs (less time to refill) and generally this is when HPO is the most demanding on the HPOP (less volume available because all the other injectors want oil too.) [/QUOTE]