higher cc injectors?? - Drifting forum

green-giant · 18-09-2008, 00:19

i keep seeing cars with 500cc,750cc or 1000cc injectors added but
can some one please explain to me the advantage of higher cc injectors....im assuming that its can provide more fuel or more pressure is it something that can just be added without messing about with anything or does it need a whole new remap or what??
Jamie

Mark_McQ · 18-09-2008, 01:19

It lets you dump more fuel into the engine when you increase the amount of air going in, most commonly by upping the boost pressure on turbos.
A general rough guide is usually 1cc=1bhp, so a set of RB20 270cc ones for example are good for roughly 260-ish. If you fit bigger injectors, you need to either fit a remappable ecu/piggyback or something like an S-AFC. ECU's read injectors as a percentage, so if your car had 270's and they ran at 70%, of you stuck a set of 550's in without a remap or any kind of control, you'd be dumping almost twice as much fuel into the engine which would almost certainly be engine death..

superclarkey · 18-09-2008, 01:42

the whole 1bhp = 1cc don't really work.

Anyways think of it simply, if you car has a 444cc injector (GTR exsample) and you put a set of 555cc injectors in.. then you have 25% more fuel at any load point on any given map.. as injectors are only told one insturction, how long to stay open for which is messured in miliseconds, (ms) upto 16ms max.

shirunai · 18-09-2008, 11:35

nope the 1bhp isnt really working my friend has 4x1800cc on his sr20det with pretty high injector duty.

**Bon Bon** · 18-09-2008, 11:49

BHP to CC kinda works on a 6 cylinder engine, it gives you a rough guide, but it depends on side feed/top feed/fuel pressure etc etc.

So in theory, 500cc injectors on a 6cyl car give enough fuel for 500bhp. If they're maxed, and they don't always. 540cc injectors on my chaser were giving up at 470bhp, so the rough guide thing works.

That's just for 6 pot though, 4 is different.

Midlands_Si · 18-09-2008, 12:31

Quote:

Originally Posted by shirunai

nope the 1bhp isnt really working my friend has 4x1800cc on his sr20det with pretty high injector duty.

wtf?! what power is he running?! If it's not astronomical then surely something is uber wrong there?!

superclarkey · 18-09-2008, 12:32

sounds to me like he has some supersoaker injectors fitted.

ant · 18-09-2008, 13:57

not really they are cheap and come out of rx-7, i had a set but never got round to using them

18-09-2008, 00:19	#1 (permalink)
green-giant touge runner Join Date: Jan 2008 Location: Lancing, Near Brighton Posts: 243	higher cc injectors?? i keep seeing cars with 500cc,750cc or 1000cc injectors added but can some one please explain to me the advantage of higher cc injectors....im assuming that its can provide more fuel or more pressure is it something that can just be added without messing about with anything or does it need a whole new remap or what?? Jamie

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18-09-2008, 01:19	#2 (permalink)
Mark_McQ dorifto kingu! Join Date: May 2007 Location: Scotland Posts: 696	It lets you dump more fuel into the engine when you increase the amount of air going in, most commonly by upping the boost pressure on turbos. A general rough guide is usually 1cc=1bhp, so a set of RB20 270cc ones for example are good for roughly 260-ish. If you fit bigger injectors, you need to either fit a remappable ecu/piggyback or something like an S-AFC. ECU's read injectors as a percentage, so if your car had 270's and they ran at 70%, of you stuck a set of 550's in without a remap or any kind of control, you'd be dumping almost twice as much fuel into the engine which would almost certainly be engine death..

18-09-2008, 01:42	#3 (permalink)
superclarkey ______________ Join Date: Aug 2004 Posts: 9,249	the whole 1bhp = 1cc don't really work. Anyways think of it simply, if you car has a 444cc injector (GTR exsample) and you put a set of 555cc injectors in.. then you have 25% more fuel at any load point on any given map.. as injectors are only told one insturction, how long to stay open for which is messured in miliseconds, (ms) upto 16ms max.

18-09-2008, 11:35	#4 (permalink)
shirunai dorifto kingu! Join Date: Mar 2005 Location: ornskoldsvik sweden Posts: 704	nope the 1bhp isnt really working my friend has 4x1800cc on his sr20det with pretty high injector duty.

18-09-2008, 11:49	#5 (permalink)
Bon Bon What Pizza? Join Date: Jul 2004 Location: Moseley, Birmingham Posts: 5,286	BHP to CC kinda works on a 6 cylinder engine, it gives you a rough guide, but it depends on side feed/top feed/fuel pressure etc etc. So in theory, 500cc injectors on a 6cyl car give enough fuel for 500bhp. If they're maxed, and they don't always. 540cc injectors on my chaser were giving up at 470bhp, so the rough guide thing works. That's just for 6 pot though, 4 is different.

18-09-2008, 12:32	#7 (permalink)
superclarkey ______________ Join Date: Aug 2004 Posts: 9,249	sounds to me like he has some supersoaker injectors fitted.

18-09-2008, 13:57	#8 (permalink)
ant R32 GTR-S Join Date: Jul 2004 Location: drugby Posts: 2,979	not really they are cheap and come out of rx-7, i had a set but never got round to using them