Bigger Fuel Injectors w/ JRSC?

Brian, did you ever find out about the size of that drill bit you used?

it will never hurt to run bigger injectors but just dont to big becouse of feul fouling the plugs and a reduction in preformance

yeah bigger injectors would be great cuz i heard at stock they are running at 90%. However, you would need some way to control the extra flow... Hondata(bling bling), V-AFC, or whatever.

How would a performance fuel delivery system (fuel rail, fuel pump, and fuel pressure regulator, larger injectors) help on a JRSC'd application? How about ignition?

RaceInspired said:

How would a performance fuel delivery system (fuel rail, fuel pump, and fuel pressure regulator, larger injectors) help on a JRSC'd application? How about ignition?

Click to expand...

Fuel rail won't help. Basically the only things those are good for are pushing huge injectors and for making the engine look more colorful. The stock rail should be good for around 400 HP or more. Get the fuel pump, it should be mandatory. FPR will help you regulate the fuel pressure better, but I've yet to hear ONLY positives about the AEM FPRs and their diaphrams, etc. Larger injectors has been covered before. An Ignition would be okay, but some of us agree that the stock ignition is more than adequate provided your plugs are gapped correctly and some of us have seen cars with aftermarket ignitions where they have had nothing but problems with them.

Larger injectors ARE NOT necessary if running the original 6 lb pulley included in the kit and not the upgraded 12lb pulley. The JRSC kit was designed to run off stock injectors. It's wise however to purchase the upgrade JR fuel pressure riser. The upgraded walbro fuel pump is recommended but not neccessary. I ran stock injectors with the JR FRP for 2 years with no problems what so ever. I think it's a waste of money.

I'm running a Hondata programmable engine management system with 440cc injectors on my ITR. Fuel pressure is set to stock, (52 psi off vaccum) and I'm running 8.5 psi. The rising rate regulators suck and will always run extremely rich on the top end unless you use some sort of fuel control device, i.e., V-AFC etc., plus the stock injectors are being pushed extremely hard with anything over 60 psi. The proper way to do it is to upgrade your injectors so they stay at or below 80% cycle duty for your horsepower application and allow you to run your stock fuel pressure.

Mugenpwr said:

I'm running a Hondata programmable engine management system with 440cc injectors on my ITR. Fuel pressure is set to stock, (52 psi off vaccum) and I'm running 8.5 psi. The rising rate regulators suck and will always run extremely rich on the top end unless you use some sort of fuel control device, i.e., V-AFC etc., plus the stock injectors are being pushed extremely hard with anything over 60 psi. The proper way to do it is to upgrade your injectors so they stay at or below 80% cycle duty for your horsepower application and allow you to run your stock fuel pressure.

Click to expand...

exactly...

kinda ironic though... i didnt know mugen made superchargers...

I found some cheap rc injectors and i was wonderin... are aftermarket injectors suppose to come with a gasket? or do i just use the stock ones? Also i heard the JR FRP doesn't work good with bigger injectors is that true? I really want to get the injectors b/c isn't running high pressure really dangerous? I've heard of people goin like 90+.

If you change injectors do you have to do something to your ECU to run them?

I also heard about using 97-00 Prelude injectors as a budget setup. anyone heard about this?

The biggest injector the factory ECU is going to be able to efficiently handle are 270cc/min. injectors. For anything bigger than that, you're going to have to have some sort of fuel control device to control the injector pulse width. An Apexi V-AFC would work perfectly, but will need to be tuned in on a dyno.

I heard the 97-00 Lude injectors were 270cc's
is that true?

Yes, as far as I know.

i was told by RC Eng. that the 97+ injectors are 280cc (h22a)and the Accord (F series?) are 270cc. i'm using the Accord 270's with my b18c1 setup, should be done next month.

just wanted to relate what i've been told

later

Anyone know if Honda/Acura has any bigger injectors besides the lude ones? For example, NSX size injectors? I emailed Comptech, but have not yet recieved an email back yet. Anyone know at the moment of anythign else that may be bigger than the ludes's 280cc injectors?

i personally don't know of any bigger Honda injectors than the Lude H-series motor, though i'm sure that the NSX V6 ones would flow quite a bit. then again the NSX injectors may be almost the same as the Lude's since there are 6 cylinders stead of 4.

but i wonder if they would be plug and play if you can even get your hands on a used set??

it would be nice to get a hold of bigger Honda injectors than the Lude's. it could save some $$ and may work well.

thanx for the tip!
didn't even think of tryin other Jap motor injectors like the DSM.
if they have 440's that's alot of fuel for a stock motor though it is a turbo.

hey i was wondering what the stock Eclipse/Talon boost is to make the 190 or 200 HP they have in stock trim.

anyone know?

later

sweet said:

i personally don't know of any bigger Honda injectors than the Lude H-series motor, though i'm sure that the NSX V6 ones would flow quite a bit. then again the NSX injectors may be almost the same as the Lude's since there are 6 cylinders stead of 4.

but i wonder if they would be plug and play if you can even get your hands on a used set??

it would be nice to get a hold of bigger Honda injectors than the Lude's. it could save some $$ and may work well.

Click to expand...

I doubt the used NSX injectors will save you anything over the aftermarket ones. I've seen RC 440cc selling for $285 on GB and I heard the lude's were like $125 each so that would mean like $500 for the set! $$$

Oh and BTW, this is the reply that I got from Comptech regarding the NSX injectors:

Email from Comptech
Not sure of what size the NSX injectors are. We are just told that they are
a Honda injector, no specific one. You should be able to use the NSX from a
3.2L without any mods. Thanks.

Click to expand...

This is what I found. Can anyone tell from that chart how big the NSX injectors are?

http://www.nsxprime.com/ubb/Forum10/HTML/000243.html