Ok, I have a 95 JDM h22a in my hatch. I am going allmotor and am wondering what size injectors people are using?? I don't know a lot about injectors so any info will surely help!

 

It depends on the amount of hp you're making. 250hp at a .45 bsfc and 85% duty cycle will need around a 350cc or 34lb/hr injector, 300hp at the same settings should be around 420cc or 40lb/hr.

 

What will you be doing other then "building" your motor, how much more injector if any at all will varry on your build.

So what kind of build are you doing?

 

ok... so far all i have done is intake manifold, STR fuel rail, and header. I will be ordering vavles, springs, retainers, and cams here within the month, also doing a port and polish. Eventually I will resleeve it, and build the block.
-Another question, I have an STR fuel rail, will the AEM fuel pressure regulator work on that rail? I read that I would need to use the AEM rail....is this true or can I use my STR one?? Thanks for the help. And what brand injectors should I use, is RC pretty much the most common?

 

So far with what you have I can't see you needing anything greater than a 310cc injector size.

 

but once i get the block and head work done will i need to up the injector size?

And does anyone now if I buy a AEM adjustable fuel pressure regulator, will it bolt on to my STR fuel rail, will i have to fab a little or direct bolt up? Thanks

 

ok, so i just got off the phone with intec racing in kent, washington and they said that if i am going to use bigger injectors that i will not need to use a aem fuel regulator...can someone explain this to me? And is a 440 injector to big or should i go with something in the 300 range? Thanks

 

370's are a decent all-motor injector.

If you go bigger injectors you are serving the purpose of more fuel therefore adjustable pressure is not needed.

Most that use adjustable pressure up the stock amount to a higher pressure and leave the stock injectors in place. This causes more fuel to get pumped out of the smaller oem injectors to get the A/F ratios good.

Hope that helps you understand. That is as dumbed down as I can get.

 

oh, ok. so if i get like 370's...it would be a waste of my money to get a FPR? Would it benifit me when it comes to tuning or not? OR should i simply use stock injectors and get an AEM FPR?

 

Go for the larger injectors. You really don't want a smaller injector running at a higher fuel pressure at almost a 100% duty cycle to give you the same air fuel ratio's as a larger injector set running at stock fuel pressure and a lower duty cycle.

 

go with 440's...it gives you plenty of injector to work with and you can always tune it accordingly, just b/c it is a 440cc injector does not mean it HAS to flow that much...im running 440's and my all motor type r and get a lot better gas mileage than with the stock 270's...440's just give you that little piece of mind that you wont run out of injector

 

where is a good place to order these from with a decent price...its a 95 h22a...thanks

 

The sponsor section or marketplace usually has them for pretty cheap. Cheaper than a retail outlet anyway.

I know I picked up some NEW RC 550's last year for around 200.00. You just gotta be patient and know when you find a good deal.

Average price I believe is around 250.00-275.00

Retail is 300.00-325.00

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 89EF_Turbo &raquo;</TD></TR><TR><TD CLASS="quote">Go for the larger injectors. You really don't want a smaller injector running at a higher fuel pressure at almost a 100% duty cycle to give you the same air fuel ratio's as a larger injector set running at stock fuel pressure and a lower duty cycle.</TD></TR></TABLE>

Just a note...running your injectors @100% duty cycle can burn them out. As well it takes away the injectors ability to control fuel flow. If your injectors are running static or 100% duty cycle that is usually an indication that your injectors are too small for your current setup. I believe 80% in the standard max duty cycle for optimum fuel control.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boots &raquo;</TD></TR><TR><TD CLASS="quote">just b/c it is a 440cc injector does not mean it HAS to flow that much...</TD></TR></TABLE>
For the money bigger is better, just in the fact that you can always run them at a lower duty cycle and not have to worry about them burning out.

 

On a side note you are also going to want to consider how you are going to run these injectors.

I recommend Crome free because you can at least setup the new injectors and run the same maps you have. It will adjust and recalculate for you.

Things if you don't have will want/need.
Chipped ecu capable of running your motor.
Labtop or friend or tuner that can accomodate these changes.

Otherwise you will have all kinds of problems.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sauceja &raquo;</TD></TR><TR><TD CLASS="quote">
Things if you don't have will want/need.
Chipped ecu capable of running your motor.
Labtop or friend or tuner that can accomodate these changes.

Otherwise you will have all kinds of problems.</TD></TR></TABLE>

I'm always forgetting to mention that. I always just assume people already have a chipped ecu or an engine management system of some sort...good heads up.

 

well currently i am a crome shipped ecu as well as a VAFC2....will that be sufficient enough to tune properly? What siaze and who should i get a throttle body from? Is the skunk2 one pretty commonly used or are you all motor guys going with someone else? And should a keep my short ramintake or get the AEM hybrd intake system? THanks


Modified by mitcheg6 at 5:59 PM 5/16/2007

 

ditch the vafc and stick with crome

 

ok thanks....so once i get the i440 injectors, intake mani, camp 1320 header, and str fuel rail... should i get cam gears then do a tune? I have not got the cam gears yet, should i get those before the tune?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by doood &raquo;</TD></TR><TR><TD CLASS="quote">ditch the vafc and stick with crome</TD></TR></TABLE>


OP
Man you are all over the place now.
Throttle body: BDL or send your current one to _____________ can't remember someone chime in here.
He is located on H-T oh yeah BoreMax he is good.

I like the MFactory cam gears but they don't have gold so I have AEM but am trying to convince myself to buy different ones. I want the Bisi cam gears but I could buy a damn good header for the price of those.


Good luck.


Ninjaedit: I think its MaxBore that sounds better. Sorry been boozing think I found a job in MO so gonna have to move

 

ok , i like that BDL throttle body. What size should i run... 66, 68, 0r 70 mm?? And do oem hoses to the TB get eliminated?- its just a few collant lines right? Thanks a ton!

 

Just make sure when you install your new injectors to get it tuned in with a wideband. 440's aren't too bad but you do tend to get a little injector latency with them, although not as much with Crome as with obd0 programs such as BRE or TE.

 

ok...will do. BUT... next objective....I am either going to follow thru with buying a camp1320 header or get cam gears and a throttle bofy.....which should i get at this point in my build....I have intake mani, fuel rail, intake, exhaust.....thats it


Modified by mitcheg6 at 3:30 PM 5/17/2007

 

bump.....need help

 

If I had to choose I would get a badass header over a throttle body and cam gears.

Look around for used cam gears and 100.00 for maxbore and your set down the road.