Fuel Delivery

you could and as long as you stay n/a your pump will keep up, but it wouldnt hurt to upgrade the fuel pump later on. 19's could possibly still maintain, but it would be easier and without a doubt with the 24's, make sure you have the right meter for the injectors

The mass air meter is what greengoblin95 is refering to. So If you do run 24's make sure you get a meter calibrated for that. Also a tune would not hurt. your computer probably won't like the stage 1 cam and any issues from that could be taken care of.

The OEM pump is tiny :Word:
therefore
You need to upgrade

While a 110 lph will do the job ... I'd just do a 255 unit

If you do aftermarket h/c/i and ALL supporting parts

You will push 24's to the limit at stock pressure

Again ... notice the words ... Stock Pressure

If you are gonna tune it
and
With a combo such as this ... you should

You need to decide if you are gonna run OEM pressure
or
Go with an afpr and run elevated pressures

My beliefe is to do it like Ford did it from the factory

Run the stock OEM pressure and if doing that ........

I'd run 30's

If you go this route ... save the money as afpr is not needed

Grady

tderrick said:

afpr = aftermarket fuel pressure regulator I take it??

Click to expand...

Adjustable.

Now, you asked if a tune was necessary. Your car will run on the stock tune and all, but it won't run to its fullest potential, and may have some idle/air/fuel issues down the road. I don't know about your area, but around here the most reputable tuners charge $400-$500 for a tune, and it's more than worth it. Grady was dead on about the fuel info too... I believe FRPP still has a deal where they're selling a 90mm Lightning MAF along with a set of, I believe, 36# injectors?? That could be something to look into.

Keep us all posted! I'm sure you'll love this build when it's done.

I hosed a bit with my info given above

I said 110 lph and should have listed the pump size as 190 lph

Grady

final5-0 said:

I hosed a bit with my info given above

I said 110 lph and should have listed the pump size as 190 lph

Grady

Click to expand...

Who needs anything under 255, anyway?

tderrick said:

Hey, Grady... Starting to read peoples sigs to get some ideas. How are you running a stock MAF with your 30 #ers...

Click to expand...

he tuned his computer. you could use the stock meter, but the tune will increase the voltage to the two wires that are in the maf to get more accurate readings for the air/fuel mixture

as you can see, a tune is always needed for any mod to gain better numbers

302GTS said:

Adjustable.

Now, you asked if a tune was necessary. Your car will run on the stock tune and all, but it won't run to its fullest potential, and may have some idle/air/fuel issues down the road. I don't know about your area, but around here the most reputable tuners charge $400-$500 for a tune, and it's more than worth it. Grady was dead on about the fuel info too... I believe FRPP still has a deal where they're selling a 90mm Lightning MAF along with a set of, I believe, 36# injectors?? That could be something to look into.

Keep us all posted! I'm sure you'll love this build when it's done.

Click to expand...

Actually, your car will run like complete crap after doing that kit and not tuning it. Total a**. I would not run 36 pound injectors on this car as you would have a bear trying to finagle the duty cycle of a too-large injector. 30s are perfect for this combo as was mentioned by Dr. Grady.

Who is...

Really smart. And posts like...

William Shatner talked on Star Trek.

The stock MAF is not "calibrated" for any size injector. The stock MAF is simply a device that uses resistive elements to transmit a voltage to the computer, 0-5V, corresponding to the amount of air flow that hits the elements in the meter. The same meter is used in both the GT and the Cobra, yet the tune in the processor is different for each car. The tune is what tells the computer how to process the data. The stock MAF is physically limited, in that it can only measure up to the air flow corresponding to around 350 fly wheel horse power.

Example: If the tune is for your 19# injectors, but you have upgraded to 24# injectors, the computer will have the injectors open AS IF they were 19# injectors. So in that instance, you will run RICH, because the computer thinks you need to utilize your 19lb injectors at say 80%, when in reality you have upgraded and you should be only running at 60%. The computer does not KNOW what size injectors you have, you have to tell it via the tune.

To complicate things, your car will attempt to adapt to the new A/F ratio, which further FUBARs your vehicle.

So in conclusion, 24s will work but will be stressed out, 30s are ideal, and yes you definitely need a tune.

Adam