Arts89Iroc

I Been Curious About This, But Will THe 24lb Injectors Cause My IROC TO Run Rich? ANd AM I Really Gonna Need To Get A New Prom? I Mean I Find That Expensive To Buy The Injectors, Plus Buy A New Prom. Need Help ASAP!

QuickStyle

24/lbs an hour is as about high as you can go with a 350 prom, you will not have to change it. the o2 sensor is capable of compensating for the richer injectors up to 24/lbs an hour.

dont let anyone tell you that ford rates their fuel injectors at a lower pressure(39) and the rate will change at gm's fuel pressure... thats a lie. all fuel injectors are rated at 43.5psi

SC2camaro

I

Zepher

iTrader: (1)

Are you 100% positive about that or is that something you heard from a friend of a friend?

this is from the Ford Motorsports Catalog,
"NOTE: These injectors are flowed at 40-psi differential pressure, and a flow data summary is included in the package."

here is something from a tuner,
"If you're changed your fuel injectors to a larger size, now is the time to change them as well. If you are using the Ford/SVO/Bosch style, you'll want to multiply their rating by 1.056 (24#=25.34, 30#=31.68, 36#=38.02, 42#=44.35, etc.), to accomodate the lower fuel psi rating at which they operate (Ford's 39 vs. GM's 43.5)."

QuickStyle

im 100% positive.

some people have come to the conclusion that since ford injectors are rated at 39psi they will flow more with 43.5psi, but most people dont understand that all injectors come from bosch in someway and are all rated at the fuel injector industry standard of 3bar(43.5psi). and will flow there stated lph @43.5psi.

i also think that rich from cruizin performance did a test on this matter, he flowed some ford injectors and some gm injectors with the same pph rating at 43.5psi and they flowed the same, might have to do a search for it, it had data tables and pictures of it.

its like tpis with their big mouth intake.... they got it from edelbrock, did one simple thing to it, and stamped there name on it.

Guest

No, they dont. Bosch is not the sole supplier of fuel injectors.

QuickStyle

well sorry about 99% do. and the industry standard is 3bar(43.5psi)
good arguement though.

3.8TransAM

I have found an injector constant of 23.8 works best when using Ford SVO 24# injectors.

Several people have verified this as well as Rich at Cruzin Performance(he just did my 30#SVO too)

They are all rated at 43.5, least everythign up thru the 30# SVO injectors are.

(I know what is said of them, that is why I am stating what I and others have found and results have been tested)

Doing 24# injectors will indeed make your car run rich and put your ecm on the side of barely being able to maintain the proper AF ratio. It will bottom the BLM out at 108 at times which is the max your vehicle can compensate for.

U would best be served if u had a chip modified to increase for your new injectors.

later
Jeremy

Arts89Iroc

I Know U Guys DOnt Aprove Of Ebay, But Will Lt1 Fuel Injectors FIt In My L98?

doc

Quikstyle:

I work at Ford,,, I quarantee you that the Ford injectors are rated at 39.5 psi.

QuickStyle

that is the fuel pressure that ford "vehicles" are set at not the "injectors"

explain to me your guarantee, just cause you work at ford doesn't make anyone believe it. no offense but look how many idiot high school kids work at autozone.

Zepher

iTrader: (1)

SC2camaro

guys

I have finally got my car back running after 2 months. while the car was tore down for headgaskets to be replaced i installed the 24 lb svo injectors and a AFPR.


when the car is running the scanner shows the block learn table to be in the high 150's-160's i have set my FP @ 40 psi with the line off.


do i need more FP than that or should i look for something else wrong

i have a stock 350 prom AUJP that i just ordered from chebby.

3.8TransAM

FOrd SVO injectors are Bosch injectors.

Bosch rates them at 43.5, as stated correctly Ford used a lower FP(39.5) in its vehicles at the time.

Myself and many others have debunked this myth by running injectors in stock vehicles and also having Ford/SVO/Bosch injectors sent out and flowed.

I can personally speak that the 30# and the 24# are rated at 43.5. Ask Rich at Cruzin for the flowcharts.

Or slap some 24#'s in a 350 without adjusting for it, BLM's running a little low aint they? :-)

later
Jeremy

doc

quikstyle, I work next to the fuel guys, we do talk some times.

3.8TransAm, Rich showed that injector flow rate depends on several things, temperature, specific gravity, atm press, etc. His post showed a 5% difference in the flow rates of 2 or more injectors depending on the SG of the fluid used in the test, the SGs differed by 12% (I think)

Ford rates their injectors at 39.5psi (rounded off to 40 psi in the catalog) because that is what Ford runs their cars at. Think about it, how else would you do it? You rate injectors at what the cars are at for fuel pressure,,, that is why GM rates injectors at 43.5 psi, our cars come from the factory with a targeted 43.5 psi,,, and the LS1 injectors are rated at 58 psi, why... the LS1 cars come from the factory setup at 58 psi fuel pressure.

Also, so called identical injectors do not flow exactly the same rate, there is always some difference, not to mention test error.

3.8TransAM

And at the bottom of it they arent Ford injectors after all.

They are Bosch and they rate them at 43.5psi.

I have had Rich flow 24# and 30# for me now and I will stick with the 24#'s are 24#'s and the 30#'s are 30#'s at 43.5psi.

With getting real flow numbers and using them on otherwise stock cars I will pretty much state it as fact.

Also, straight 24# on an otherwise stock engine with 22.1 IC(stock IC) will drop the BLM's to 108-112 and the edge of factory correctibility.

Doing nothing other than raising the IC to 23.8(which I have found best to work with the SVO 24# on a stock app) will correct the BLM back to factory spec(assuming rest of car is up to task)

Observed this on about half a dozen cars now and even my 30#'s on an otherwise stock car(not accounting for AE and all the other fun stuff) correcting it to 30.1 brought the steady state BLM back in line.

later
Jeremy

SC2camaro

Jeremy

Thanks for the info on what i need to change my injector constant to. right now i have the FP @40psi with the 24LB injectors. Mark Riley @turbo tune is going to reprogram my prom for me.


Also jeremy are you going to Bruce's pow-wow again next year is he has one. I meet you at the last one he had. i came with mark and we drove the red honda

cause if you do go i would like for you to explain some of tyhe chip burning stuf so i can start doing it myself

thanks Pat Broughton

doc

Bosch is a supplier to Ford, Ford says to rate them at 39.5 psi, guess what Bosch will do, they will rate them at 39.5 psi.
This is a slam dunk dude!

QuickStyle

well i got three smiley's on my side

3.8TransAM

Hey

I just go buy what I have seen with my own two eyes.

The flow sheets under my nose

And what I've observed on cars I've had a hand in putting them in

later
Jeremy

doc

Happy Holidays to all,

Whether they are rated at 39.5 or 43.5 makes less than 5% difference in the flow rates. As Rich has shown there is a 5% difference in his test results depending on the SG of the fluid.
So all in all, it really does not matter when you stack up all the other variables in tuning our cars. If you got your car tuned the way you like it, more power to you,,, please excuse the pun!

So, have fun and drive safely.

3.8TransAM

Arrrgggggggggggghhhhhhhhhhhhhh.

No fair even bringing up specific gravity of fuels lol

Most people here dont realize we have like 220+ different blends of fuel depending on what elevation, pollution index and climate u live in lol.

Let alone wondering why your car has knock around october when the winter fuels come in.

lol

Its not fair :-)

later
Jeremy

mantiz85ws6

Is it possible to change the BLM if it is at 108 with ford 24#'s by adjusting the AFPR?? And would you want to raise or lower the fuel pressure??

SC2camaro

you would want to lower the FP down to maybe 38 -40 psi


just remember anything lower than 128 means the car is rich and the ecm is pulling fuel out.

and higher than 128 means the car is lean and the ecm is adding fuel.


you may not get your idle blm's to be around 128 but 108 is pig rich and the ecm has pulled all the fuel out it can.


try to shoot for 120-118 do you still have the stock chip?


if not and you are able to burn your own chips set the blm's compensation down to 90 just to give tthe ecm a little more fuel trim abilities.


jeremy chime in anytime to correct me if i'm wrong

mantiz85ws6

No it is not the stock chip it was custom burned by Formatos in Florida by the guy I bought the car from so I don't know if the chip was burned before the 24# svo's were put in or not. I do know that with the scanner hooked up my blm is at 108. So adjusting the fuel pressure and watching the blm change can be done at idle or does it have to be done at a certain rpm??

SC2camaro

yes you can do it at idle but also check the blm's while at a light throttle cruise also.


i have seen one like to run a little lean at idle and be a tad rich while @ light throttle cruise.