Injectors to run with a HX35-40?

[SEVERENI]

In short:
1g 2.3L stroked 6 bolt
Walboro 255 lph HP fuel pump

Which Injectors?

Precision
-550 disco style
-580 ball style
-680 ball style
-780 ball style
-880 ball style

FIC
-550 ball style
-650 ball style
-750 ball style
-850 ball style

They come in a kit from EXTREME PSI:
https://www.extremepsi.com/store/pro...page=&amount=1

Any pro input?
Tuning will be A'PEXi AFC Neo that comes in the kit

[skatershawn]

FIC 850 on pump atleast!

Check out links:

Fuel Injector Sizing

http://www.rceng.com/technical.aspx


And this is my all time favorite link for this topic:
Injector and Fuel Pump Supported Airflow

And this should help if you want to run e85:
http://www.ecmtuning.com/wiki/baseinjectordata?s=e85

[silicosys4]

Well, Apexi themselves list the Neo as being able to tune up to 650cc injectors...I'm not sure why the vendor would list injectors that are too big for the Neo to tune as an available package deal....You'd be bummed if you tried to tune 850's with just the Neo.

[skatershawn]

Originally Posted by silicosys4

Well, Apexi themselves list the Neo as being able to tune up to 650cc injectors...I'm not sure why the vendor would list injectors that are too big for the Neo to tune as an available package deal....You'd be bummed if you tried to tune 850's with just the Neo.

This is also true. I actually have no experience with the safc, I hear it isn't much good for any injectors over 650cc's!
Something you should really look into.

Edit:
Running an hx35 with a 2.3l stroker, you will need ATLEAST 850's.
Running an hx40 with the stroker, you should run higher than 850's.
I recommend going with FIC 1050's for pump.
I highly suggest looking into the neo or just look into getting v3 lite.
It's a bit more but a LOT better than that piggy back system.
OR
Looking into caddy mod.

[turbojo]

if your going to tune with that a holset turbo is not for you get a 16g and some 650cc injectors or get dsmlink and get a holset with aleast some 1000cc injectors

[SEVERENI]

ok thanks for the input i figured a package is cheaper, but if you say 850's+ then ill run dsm link and get some 1000cc.

Any input on RC engineering injectors as well?

[skatershawn]

Originally Posted by turbojo

if your going to tune with that a holset turbo is not for you get a 16g and some 650cc injectors or get dsmlink and get a holset with aleast some 1000cc injectors

Agreed with him!

Also if you want to run that holset, what boost you plan to run, that plays a huge role?
And im not sure a straight drop in wally 255 will hold up, I recommend a rewire done to the pump also.

Edit:
I just notice it was a Walbro 255 HP. So.. Better but to be safe IMO, I personally would still do a rewire.

And I have no knowlegde on anything bigger than the RC550's.

[RocCitySlayer]

I have an hx35 boosted at 25psi with 1050cc. Seem to have pretty good flow

[Calan]

Regardless of which turbo you are running, you need to think in terms of how much airflow you expect to be pushing through your motor and which type of fuel you will be running. These two things will determine how much fuel is required. (You can also get a rough estimate of fuel requirements by knowing your target HP and using a relatively simple formula...but it's less precise).

Once you know how much fuel you need for a given amount of airflow, you can choose the right fuel system components to get you there. Besides the injector size, you also need to consider the pump (which has an indirect impact on the injector sizing), size of the feed and return lines, filter capacity, etc.

With something like ECMLink running the ECU, you can go as big as you want and not worry about it, and you'll have room to grow in the future.

[SEVERENI]

Nevermind i'm gonna go with these:

https://www.extremepsi.com/store/pro...cat=257&page=1
Precision 1000cc ball style

[Calan]

Originally Posted by SEVERENI

Nevermind i'm gonna go with these:

https://www.extremepsi.com/store/pro...cat=257&page=1
Precision 1000cc ball style

There you go... just throw something at it and see what happens.

[SEVERENI]

@ Calan

Sry i was typing the last post b4 your posted appeared Def good advice and i appreciate it.

I'm gonna do more research before i purchase any injectors. I've never heard of ECMlink... i'm a bit newish to building dsm's.

[cloead]

1000cc or bigger... i'm maxing out 1000s with an hx40

[Moy]

Originally Posted by cloead

1000cc or bigger... i'm maxing out 1000s with an hx40

6, 7, or 8 blade, and at what boost level?

[dnhieu]

on a hx40, 32psi, 2.0, bc280 cams, ported head, and 100% meth injection with a m10 nozzle i was seeing around 80% idc at 8.5k with percision 880cc injectors. i would suggest 950-1000cc injectors if you plan on running the 40 FORSURE...

[cloead]

Originally Posted by Moy

6, 7, or 8 blade, and at what boost level?

7 blade, 35psi. Wanted to push to 40 but was seeing IDC's over 110%

[Calan]

Originally Posted by SEVERENI

@ Calan

Sry i was typing the last post b4 your posted appeared

Gotcha.

Good choice on doing some more research before jumping in. It will save you a lot of $$$ and headaches in the long run.

[LandSpeed-DSM]

Originally Posted by cloead

7 blade, 35psi. Wanted to push to 40 but was seeing IDC's over 110%

How much airflow are you logging? 70-90mph times?

[2slow4utsi]

I would run PTE 1200s. They have seen low 10s on a friends car on E85. I wouldn't run anything else mentioned just for that fact alone.

[silicosys4]

Originally Posted by 2slow4utsi

I would run PTE 1200s. They have seen low 10s on a friends car on E85. I wouldn't run anything else mentioned just for that fact alone.

I'll second that, but add some info to my recommendation. I went with 850's just because I will never see E85, and this website and several like it recommended that size for my goals.

http://www.witchhunter.com/injectorcalc1.php4

However, if I had to do it all over again, since I have Link V3, I'd get 1200's or 1250's and call it a day, I think with link and a good tune, those are the perfect injectors. Fully tuneable by link from stock hp on pump gas, up to 500+ hp on E85. They will work on 99% of peoples builds.

[SEVERENI]

Does running e85 require a different tuning setup?

[Calan]

Originally Posted by SEVERENI

Does running e85 require a different tuning setup?

Yes...sort of. It requires a different tune (set of parameters), but not different tuning software... if you get the right stuff to begin with.

If you go big enough on the fuel system and get the right tuning software (I'm a big ECMLink fan myself), nothing has to change when you switch to E85 except for adjusting the tune to deliver more fuel, and to optimize the AFR and timing for E85.

[zrsnopro97]

Im running a 2.0 with a holset hx35 on e85. Using FIC 1650's.

[4GTSiMAN63]

How big injectors can you go before having to change the resister box ? And also the fuel rail ? I wanted to get some 1250cc but I'm not sure if I'll have to replace the resister box like a friend said. I got a fully built 6 bolt, HX-40 and stock injectors for right now. Thanks

[jrohner]

Originally Posted by 4GTSiMAN63

How big injectors can you go before having to change the resister box ? And also the fuel rail ? I wanted to get some 1250cc but I'm not sure if I'll have to replace the resister box like a friend said. I got a fully built 6 bolt, HX-40 and stock injectors for right now. Thanks

You remove the resistor box if you go with high impedance injectors, otherwise you leave it alone. Fuel rail is fine for a lot of power (not sure on an actual number). I would say 1250's and something good to tune with (not a piggy back).

[Dert]

The stock fuel rail is actually bigger than the majority of aftermarket rails you can buy. As far as injectors, like everybody has stated go with 1050's at least.

[4GTSiMAN63]

Originally Posted by jrohner

You remove the resistor box if you go with high impedance injectors, otherwise you leave it alone. Fuel rail is fine for a lot of power (not sure on an actual number). I would say 1250's and something good to tune with (not a piggy back).

Thanks, I got ECMlink v3 so that should be good enough to get me to my goal.

[4GTSiMAN63]

Originally Posted by Dert

The stock fuel rail is actually bigger than the majority of aftermarket rails you can buy. As far as injectors, like everybody has stated go with 1050's at least.

I didn't know that about the fuel raid now it makes no sense to spend all that money on one yet. Thanks I'm looking at some 1250's right now maybe even some 1600 to prepare for the future.

[Calan]

Originally Posted by 4GTSiMAN63

I didn't know that about the fuel raid now it makes no sense to spend all that money on one yet. Thanks I'm looking at some 1250's right now maybe even some 1600 to prepare for the future.

What fuel are you planning on running?

[4GTSiMAN63]

Originally Posted by Calan

What fuel are you planning on running?

Right now 93 Octane, and get a race tune for when I get some race gas to run on the track. I'm assuming based on your answer those 1600's too big ? If I so I was thinking if there too big maybe then can be "turned down" to work ?