Injectors

[andz]

hey guys

just wondering, is there a table or conversion method to work out what size injectors can support what power (hp)?

i did a quick search and it has been suggested that 1cc supports roughly 1hp, so 700cc inj supports around 700hp

some1 also came up with; cc x 6/5 = hp (700cc x 6/5 = 840hp), which seems quite high

please confirm

cheers,

Andy

Edited January 6, 2008 by andz

[paulr33]

370cc in rb25 is 370hp

700cc injectors are massive

id say double the power

remember theres more to just injector upgrades for safe consistent fuel delivery at 500hp

[r33cruiser]

cheers for that equation ay andy.

i was stressin about my 550cc ers not reaching 600hp...

thanks again very useful.

[mesmerized]

so by that rationale, 440cc injectors and a gtr fp should comfortably cope with 250rwkw in a rb25det?

[R31Nismoid]

Most certainly Oblivion.

Generally i use ~1hp per CC for a RB.

Works out fine.

[paulr33]

stock gtst injectors and a FPR will do 250rwkw

[mesmerized]

stock gtst injectors and a FPR will do 250rwkw

well i've already bought the injectors and fuel pump, and i want some breathing room in the event that the high flow makes much less than 250rwkw and i get bored and decide to strap on a bigger turbo . but i wouldn't be aiming any higher than 280rwkw, cause i can't afford a rebuild . so the 440cc injectors should still be up the task

[paulr33]

yeah the 440cc's will be fine

[mesmerized]

so why is it that i've read articles in hpi etc that have cars with a power output of about 500rwkw but they're using 1600cc injectors?? do injectors still work accurately even when they're being used below the level they're designed for?

[Wheezy]

Personally I would not want to be using any injector (or fuel system for that matter) at more than MAX 85% of its capacity. In case shit happens, it is probably a good insurance. (having said that how anal and redundany you want / need to be with your fuel system depends on what what your doing with the vehicle and how far you want to take things), $$$ add up quickly

[r33cruiser]

yea mate but how many 1600cc squirters are they using??

many racing/high performance cars use big injectors to suppliment their apetite. they are called 2ndary injectors. and it is very common in rotors. e.g. they may be using a few 500cc injectors then use a couple of 2000cc injectors to beef up the support.

i personally dont know y they do it. perhaps using all 2000cc squirters may be too expensive or inefficient....

im sure someone on here might know?