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View Full Version : Injector size inquery



deltrr
04-05-2004, 11:31 AM
http://forums.freshalloy.com/ubbthreads/showflat.php?Cat=&Board=UBB9&Number=67687143&page= &view=&sb=5&o=&fpart=1&vc=1

if this guy can make 280rwhp off of 370cc injectors, then do you think 550's will allow 350rwhp? I am confused because i read that 6.3cc can produce 1hp, and 370x4/6.3=234.92HP, which doesnt work with how he made 280hp off of that setup. I am looking to get ~350hp at the wheels, so i figured that I would need 720cc injectors.. but now i dont know what to think

What do you think?

BlackBomber
04-05-2004, 11:50 AM
I think you will be fine with 550s and 350whp but if you want to make sure or you want room for future growth, why not go with 740s.

Oh, I forgot that you will need some sort of fuel management. Which sort will determine if you can effectively use 740s. Stand-alone, not a problem, piggy back S-AFC you may not be able to EFFECTIVELY run a 740.

gatecrasher
04-05-2004, 02:25 PM
550's are plenty for 350rwhp.....just dont plan on going over ~375 with them.

orion
04-05-2004, 08:29 PM
And read that whole thread...that dyno was a fluke, or something. 8psi and 280rwhp don't mix on a KA-T...

That's a bad example of a car to use at high HP on 370s, as that's - Get ready for a statistics flashback - an "outlier"...which are usually not considered as credible data to support an argument.

So use the norm, which is about 250rwhp from 370s...

That's a .5 BSFC, and 90% duty cycle...

So 550s with the same BSFC and duty cycle will net you 377rwhp as the MAX.

So based on real world numbers, that are tried, trued, and repeatable...you get realistic estimates.

- Brian