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Is there a ratio of cc per unit of power to go by?

4K views 41 replies 16 participants last post by  PowerHungry 
#1 ·
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? :confused:
 
#3 ·
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.

Enjoy.
 
#4 ·
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.
 
#9 ·
that explains why mine was every bit of 650hp. i know how much fuel was in there and yall have seen how lil it smoked under full boost.
 
#11 ·
This is a pase out of the first post in this thread:
Choosing The Right Injector For Your 7.3 - Powerstroke Nation

General Rule of Thumb max power with no nitrous (but a properly matched turbo):

90cc stock nozzle 225HP
130cc stock nozzle 260-290HP
160cc stock nozzle 325-345HP
160cc 30% nozzle 350-360HP
180cc stock nozzle 300-350HP
180cc 30% nozzle 370-390HP
180cc 80% nozzle 400-425HP
200cc 30% nozzle 385-410HP
200cc 80% nozzle 400-440HP
200cc 100% nozzle 420-460HP

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
 
#13 ·
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?
 
#12 ·
thats why i ran a different tune almost every pull:poke:. still gettin it fine tuned remember:evil. we can continue soon lol.
 
#25 ·
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?
 
#29 ·
From Beans or swamps?I thought 80% nozzles where the stage 2 160cc nozzle.So its a 100%?
 
#30 ·
#32 ·
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
 
#31 ·
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.
 
#34 ·
These were 180cc's with 100% nozzles built by me :poke:

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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