fuel injectors

[tallpaul]

What size are the original fuel injectors?

[ImpalaSlayer]

24lbs i believe?

[tallpaul]

That's all I thought they were closer to 30? Thanks for your help.

[ImpalaSlayer]

That's all I thought they were closer to 30? Thanks for your help.


nope, eithe 22 or 24 im pretty sure

[tallpaul]

Great, now I have to spend more money to get bigger injectors. When will it end? Sometimes I wish I did not like cars, I would have more money in the bank if I didn't.

[ImpalaSlayer]

what are you doing exactly?

[FordNut]

Yep, they're 24 lb.

[tallpaul]

Just slowly building my way up to a supercharger and or nitrous. It needs the stainless works exhaust system but, I don't have that kind of money. I guess I am putting the cart before the horse so to speak.

[ImpalaSlayer]

Just slowly building my way up to a supercharger and or nitrous. It needs the stainless works exhaust system but, I don't have that kind of money. I guess I am putting the cart before the horse so to speak.

well if you buy a kit, the proper sized injectors will come with it. if your building your own swap you can pick up used injectors fairly cheap.

[bawazir]

For a supercharger you need a minimum of 39ib

[ImpalaSlayer]

For a supercharger you need a minimum of 39ib

that statement isnt valid. you need the proper sized injector for your application. for most, yes 39s are plenty.

[bawazir]

What size are you running ImpalaSlayer?

[ImpalaSlayer]

What size are you running Impalaslayer?

currently i have stock 03/04 cobra injectors which are 39#. soon ill be going to 60s if i ever get around to building this motor i have.

[tallpaul]

Right now their stock but the car has minor upgrades. Tb, Undr pulleys, k&n, programmer, bigger fuel rails. I don't have the money for a complete supercharger kit right now but where can I get used injectors? Here on the website?

[ImpalaSlayer]

Right now their stock but the car has minor upgrades. Tb, Undr pulleys, k&n, programmer, bigger fuel rails. I don't have the money for a complete supercharger kit right now but where can I get used injectors? Here on the website?

search mustang forums such as svtperformace, modularfords, corral.net

ps you wont need or benefit from larger injectors so long as you NA, unless you go to a big bore stroker.

[tallpaul]

I just didn't want to run the engine too lean even with these upgrades.

[bawazir]

http://cgi.ebay.com/ebaymotors/03-04-Mustang-Cobra-39lb-fuel-injectors-4-6-dohc-LS1_W0QQitemZ280469743300QQcmd ZViewItemQQptZMotors_Car_Truck _Parts_Accessories?hash=item41 4d4ca6c4

[ImpalaSlayer]

I just didn't want to run the engine too lean even with these upgrades.

you wont, besides you cant just switch to 39s, it would require tuning.

[massacre]

ps you wont need or benefit from larger injectors so long as you NA, unless you go to a big bore stroker.

Not sure if I agree with this 100%^^^
Depends on the tune and the build IMHO. I'm running 30#ers but obviously I probably won't need more than that.
OP- I found my FRPP injectors used from a local forum for $75. I had to clean them up quite a bit but the price was right.
But if you're bone stock I think the 24#ers should suffice. It's good that you're looking ahead, though.

[ImpalaSlayer]

Not sure if I agree with this 100%^^^
Depends on the tune and the build IMHO. I'm running 30#ers but obviously I probably won't need more than that.
OP- I found my FRPP injectors used from a local forum for $75. I had to clean them up quite a bit but the price was right.
But if you're bone stock I think the 24#ers should suffice. It's good that you're looking ahead, though.

your running a 5.4 though arnt you? lol

[massacre]

your running a 5.4 though arnt you? lol

Not yet, 4.6 first. But I am building the car for the 5.4, if that makes any sense....lol

[tallpaul]

Other than those minor upgrades I listed before, I plan on getting the ECU professionally programmed so an injector swap shouldn't cause a problem. How much of a mpg difference will there be b/n 24 and 30# injectors?

[ImpalaSlayer]

Other than those minor upgrades I listed before, I plan on getting the ECU professionally programmed so an injector swap shouldn't cause a problem. How much of a mpg difference will there be b/n 24 and 30# injectors?

you really dont need them, they wont do anything for you

[tallpaul]

Alright I guess I will wait. Thanks for the help.

[ImpalaSlayer]

Alright I guess I will wait. Thanks for the help.

unless you get some boost or a bigger engine you will be fine with stock injectors and pump.

i had full bolt ons and still ran the stockers with plenty of margin

[tallpaul]

Nitrous is still in the plans and I didn't want to lean the engine out even for those few seconds. I will still wait.

[ImpalaSlayer]

Nitrous is still in the plans and I didn't want to lean the engine out even for those few seconds. I will still wait.

cant help with n02, i know nothing about it

[tallpaul]

By the way I like your name "impala slayer". When I was shoping around for a car it was b/n an impala and the MM. Obviously I chose the MM, partly b/c you see more impala's than MM's. I joked with a guy in my welding class and I called my car an impala slayer. I think he wanted to race me but that hasn't happened yet.

[ImpalaSlayer]

By the way I like your name "impala slayer". When I was shoping around for a car it was b/n an impala and the MM. Obviously I chose the MM, partly b/c you see more impala's than MM's. I joked with a guy in my welding class and I called my car an impala slayer. I think he wanted to race me but that hasn't happened yet.

well i hate chevys and impalas are down right ugly so it works lol

[FordNut]

It won't hurt anything gong with bigger injectors, as long as you get the car reprogrammed for them. Fuel mileage should be the same, fuel is injected based on air flow through the MAF, which is a function of engine air pumping. That will stay essentially the same unless you add a blower. Bigger injectors ARE needed for nitrous. Many cas do just fine with stock injectors and a 50 shot. Go with a bigger nozzle and you need to upgrade injectors. Gotta have a nitrous tune to pull timing, so that would be a good time to modify the non-nitrous tune to change fuel injector parameters. If you have future plans for big power, go with 60's. Don't even mess with 50's, I had some and had to get rid of them. For moderate power levels 39's or 42's are fine. I've heard they are the same thing, just different manuracturers using different fuel pressures for testing.

[massacre]

I should have clarified that my car will be tuned for the 30# injectors

[bocat187]

if i was to put a hundred shot of nitrous would bigger injectors help

[bocat187]

if i put a 100 shot nitrous will bigger injector help

[ctrlraven]

Skip the cheap thrill and danger juice comes with unless the car is setup up for it. A good tune, intake, 3000 or 3500 stall converter and 4.10 gears is all you need to start out with.

[LeoVampire]

If you had a pretty good carb you could change the jets for larger one's so more fuel could be deliverd to the engine when needed but you still needed a pump that could keep the fuel in the carb once you stomped on it.

But with o2 sensors and a PCM that hasn't been programed properly the system will only let it run so rich or lean according to how it is set up.

If the PCM dosn't know it has something larger to work with for delivering fuel it will not allow it to happen and it will not run properly because those adjustments and controls are no longer in your hands like on a carb with just punching the throttle with your foot.

THE PCM see's your demand for more through the throttle possition sensor only but it dosn't realize it can give you more with out the proper ajustments made to it so it can send the right electricl impulses to the injectors and have them open up.