This has probably been covered a zillion times but I can't seem to find a solid answer. Let me lay it out, in gas the size of carb/injs is somewhat relevant to power. There is the exception to the rule but for the most part there is a place and time to step-up to a bigger set-up.
I was just reading the 600HP post and came across a post saying a guy was making 600 with 260cc's.
I'm still drenched behind the ears on inj's so can somebody fill me in?
A good rule of thumb is about 2.25 HP per CC on a 7.3L. There's no hard, fast rule as differences in atomization, airflow, compression, boost, timing and other factors will help the final determination of HP... but it's close.
Figure...
175 CC injectors will ideally make 395 HP
230 CC injectors will ideally make 515 HP
250 CC injectors will ideally make 560 HP
300 CC injectors will ideally make 675 HP
350 CC injectors will ideally make 785 HP
Granted, many of these injectors will require significant turbo setups and maybe even nitrous to get enough oxygen in the cylinder to properly consume the fuel. Also, poor atomization will result in significant power losses and lots of unburnt fuel (smoke) in the exhaust.
That's it, I figured somebody had already answered and posted it but you know how searches go. Anyway thanks, that should be a sticky!
Also, just from reading in here arent there are 2 kinds of inj's, mod and un-mod. I'm probably saying it wrong it seems like I've read guys talking about say a 160 and a DIY 160. Are the sizes and ratio you gave for 1 or the other or, as ussual I'm miss-understanding inj talk.
It also depends on when that amount of fuel gets in there and how fast it burns. You can have 350cc's but if your burning over half of it ATDC, then what good is it? It needs to be usable fuel.
238cc 30% nozzle 440-475HP
(depends on air flow in lower rpms can make 550HP with nitrous for example)
238cc 80% nozzle 450-520HP
238cc 100% nozzle 465-550HP
250cc 30% not much gain over 238cc with 30%
250cc 80% nozzle 460-530HP
250cc 100% nozzle 470-575HP
There was my 2nd ? I'm still in the dark on the %. What is going on here the cc is (as you told me once before) the volume of the inj if I'm not mistaken. What is the % of nozzle if not more V?
So a 100% is going to suck fuel and smoke? Man, I'm glad I got all winter to figure this crap out. I'm setting aside $2500 for inj's, turbo, and HPOP. The trans is going to a friends and the weight is going to be in the 4500lb range so the breakage should be minimal. I'd like to be in the 800lb 450hp range. What inj would you suggest?
My 100% hybrids get better or equal mileage to stock. They are smokey though.
$2500 will only get one of those things. If you are on a budget go with smaller hybrids (this eliminates big oil). The turbo will run you that much too.
I'd heard a 17* was around $450 and I've seen the turbo I want for around $500 so that leaves around $1500 for inj's. I'm just wondering how much inj that will buy?
for the heck of it,Beans is gauranteeing 430hp with there stage 2's but not sure what size nozzle.Thats quit a bit higher then what matts saying.Why? :shrug: bdp custom 7.3 tuning - Powerstroke Nation
next time i run my truck (the 29th) i'll make sure to weigh it at the end of the track and use the calculators here since i should be a good bit quicker then last year with a hard launch and finally a good 17* HPOP... i should be right around the 420ish hp range with a stock turbo
Stage 2s can make 435. We dynoed a truck with that exact combo and made 435 if I remember correctly. They were made by Cass and had 100% nozzles. The torque wasn't that impressive but it carried the non impressive torque to about 3100 rpms where it made good power.
These were 180cc's with 100% nozzles built by me oke:
I'm not sure if they were doing anymore than a 160cc injector, because they were built before our flowbench was done, and they havent been out of the truck since they were installed...
He was also sporting a Gen3 style HPOP, regulated return fuel system, and a Stock 62mm H2E.
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