Fuel Injector sizes without regulators or fuel pumps

streetstang06 · January 23rd, 2006, 12:42 AM

I want to get bigger injectors for my 1998 gt but don't want to have to purchase a fuel pump or regulator. What is the biggest size i can get without having to buy all that?

mdvaldosta · January 23rd, 2006, 12:54 AM

Probably 24's, those will be OK for sure. #30's would likely be too much. But, why are you asking? Do know that larger injectors do not increase horsepower, rather they support more. It's not likely that you will make enough horsepower without a poweradder to need more than 24's.

Bill · January 23rd, 2006, 01:19 AM

i hear the #19's are good to 300 HP

Roadhawg · January 23rd, 2006, 08:12 AM

Originally Posted by Haus

i hear the #19's are good to 300 HP

Unless your engine is supercharged.......

I'm using 42lb injectors, gives me room to grow.

streetstang06 · January 23rd, 2006, 03:30 PM

Thats just it! I'm over 300 horsepower already and need more fuel to put into the large amount of airflow. Fuel injectors obviously do help increase horsepower or everyone would stick with the stock 19#'s. Other than the guy that says fuel injectors don't help can anyone one else tell me if i would be better off getting a fuel regulator and fuel pump with bigger injectors or should i just go for some 24#? Thanks

87vert · January 23rd, 2006, 04:16 PM

Originally Posted by streetstang06

Thats just it! I'm over 300 horsepower already and need more fuel to put into the large amount of airflow. Fuel injectors obviously do help increase horsepower or everyone would stick with the stock 19#'s. Other than the guy that says fuel injectors don't help can anyone one else tell me if i would be better off getting a fuel regulator and fuel pump with bigger injectors or should i just go for some 24#? Thanks

what was the air fuel on the dyno? how about duty cycle? that will tell you if you need bigger injectors, and injectors do not increase horsepower they can actually decrease it if not tuned for them, a regulator would be cheaper and easier, all you have to do is up the fp and you can get more fuel.

streetstang06 · January 23rd, 2006, 06:09 PM

What exactly does the fuel regulator do that the fuel pump doesn't? I'm planning on getting 24# injectors and was told just to go with a 155 lph fuel pump. Is it better to keep the stock fuel pump and get a regulator?

87vert · January 23rd, 2006, 06:36 PM

regulator controls pressure, pump controls volume, its a good idea to upgrade everything if you plan on getting more power, dont forget a calibrated maf

streetstang06 · January 23rd, 2006, 09:14 PM

Does anyone know how hard it is to install a fuel pump and fuel regulator and how much time? I like to do most of the work myself. Are you saying that i should go for both the regulator and the fuel pump? Do you just choose a spot for the regulator to go or is there a certain spot? Thanks in advance!

mdvaldosta · January 23rd, 2006, 09:40 PM

The fuel pump is fairly straightfoward, here is an article on our site written by one of our members. It's an install in a late model Saleen, but it's gonna be nearly identical to what you'd have to do:

Saleen fuel tank swap

Just to give you an idea. You'd simply be dropping the tank and replacing the pump. The fuel pressure regulator is simple, it's right on your fuel rail under your hood. It's essential for dialing in the correct fuel pressure for a proper tune. Your stock fuel pressure regulator isn't adjustable, so you just replace it with an adjustable unit.

If your making 300hp, it's a good time to go to 24's. You won't need anymore than that unless you go with a poweradder in the future. Like already suggestion, you need a mass air meter calibrated for larger injectors, so be sure to get that too.

streetstang06 · January 25th, 2006, 03:32 PM

Thanks for all that info! I also have a question about the MAF now. How do you recalibrate the MAF for the 24# injectors? Or do i just need a new one?

mdvaldosta · January 25th, 2006, 08:17 PM

You won't be able to calibrate it yourself, you will need to buy an aftermarket unit. You may be able to get a \ tune to correct for the injector change, but it's best just to get the right MAF.

Hotrodvdog · January 27th, 2006, 02:28 AM

Fuel pump swap is not hard. Relieve fuel pressure, undo fuel pump fuse, turn on ignition twice but don't start engine, disconnect battery, take gas cap off, undo 3 bolts that hold filler neck in gas cap compartment, support tank with car jack, undo straps(2 bolts), undo power cable, lower tank slowly, undo bolts to tank assembly, pull out fuel pump basket, take top off by pressing tabs on side of basket, lift up basket assembly, replace pump, everything else in reverse to reassemble. If you're upgrading to a Walboro, you will need to remove some material from the top of the assembly where it meets the fuel pump. I used a Dremel with a cut off wheel and it fit nicely. Very clean install. I installed a Walboro gss341. And many people said it wouldn't work. Vortech engineering carries this pump for 98-04 Mustang GTs.

beheivjer · February 26th, 2006, 08:16 PM

i was going to use #24 and a cobra maf but i could not get any answers if the cobra maf is 24 like i think it is.

mdvaldosta · February 26th, 2006, 08:47 PM

Yes, Cobra MAF and injectors are 24# from 93 up to 02 (well, until the 03 Cobra that is).

beheivjer · February 26th, 2006, 11:02 PM

you think that #24 and a cobra maf would work ok on my 98 gt?

January 23rd, 2006, 06:36 PM	#8
87vert Regular Join Date: Nov 2005 Location: Virginia Beach, VA Posts: 248	regulator controls pressure, pump controls volume, its a good idea to upgrade everything if you plan on getting more power, dont forget a calibrated maf __________________ '96 Exploder XLT 5.0 AWD "turbos coming soon"

February 26th, 2006, 08:16 PM	#14
beheivjer Enthusiast Join Date: Feb 2006 Location: belding, michigan Posts: 834	i was going to use #24 and a cobra maf but i could not get any answers if the cobra maf is 24 like i think it is. __________________ 1969 Early Bronco 3.5" lift 37" swampers 1969 Early Bronco 2" lift half cab 1979 2.3t Cobra 1997 Black Cobra http://www.cardomain.com/ride/680999 http://www.myspace.com/beheivjer

February 26th, 2006, 11:02 PM	#16
beheivjer Enthusiast Join Date: Feb 2006 Location: belding, michigan Posts: 834	you think that #24 and a cobra maf would work ok on my 98 gt? __________________ 1969 Early Bronco 3.5" lift 37" swampers 1969 Early Bronco 2" lift half cab 1979 2.3t Cobra 1997 Black Cobra http://www.cardomain.com/ride/680999 http://www.myspace.com/beheivjer

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January 23rd, 2006, 12:42 AM	#1
streetstang06 Newbie Join Date: Jan 2006 Posts: 17	Fuel Injector sizes without regulators or fuel pumps I want to get bigger injectors for my 1998 gt but don't want to have to purchase a fuel pump or regulator. What is the biggest size i can get without having to buy all that?

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January 23rd, 2006, 12:54 AM	#2
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,941	Probably 24's, those will be OK for sure. #30's would likely be too much. But, why are you asking? Do know that larger injectors do not increase horsepower, rather they support more. It's not likely that you will make enough horsepower without a poweradder to need more than 24's.

January 23rd, 2006, 01:19 AM	#3
Bill Hardcore Enthusiast Join Date: Aug 2005 Posts: 1,327	i hear the #19's are good to 300 HP __________________ Too often, We lose sight of life's simple pleasures. Remember, when someone annoys you it takes 42 muscles in your face to frown, BUT, it only take 4 muscles to extend your arm and bitch-slap that Mother@#?!&! upside the head!!

January 23rd, 2006, 03:30 PM	#5
streetstang06 Newbie Join Date: Jan 2006 Posts: 17	Thats just it! I'm over 300 horsepower already and need more fuel to put into the large amount of airflow. Fuel injectors obviously do help increase horsepower or everyone would stick with the stock 19#'s. Other than the guy that says fuel injectors don't help can anyone one else tell me if i would be better off getting a fuel regulator and fuel pump with bigger injectors or should i just go for some 24#? Thanks

January 23rd, 2006, 06:09 PM	#7
streetstang06 Newbie Join Date: Jan 2006 Posts: 17	What exactly does the fuel regulator do that the fuel pump doesn't? I'm planning on getting 24# injectors and was told just to go with a 155 lph fuel pump. Is it better to keep the stock fuel pump and get a regulator?

January 23rd, 2006, 09:14 PM	#9
streetstang06 Newbie Join Date: Jan 2006 Posts: 17	Does anyone know how hard it is to install a fuel pump and fuel regulator and how much time? I like to do most of the work myself. Are you saying that i should go for both the regulator and the fuel pump? Do you just choose a spot for the regulator to go or is there a certain spot? Thanks in advance!

January 23rd, 2006, 09:40 PM	#10
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,941	The fuel pump is fairly straightfoward, here is an article on our site written by one of our members. It's an install in a late model Saleen, but it's gonna be nearly identical to what you'd have to do: Saleen fuel tank swap Just to give you an idea. You'd simply be dropping the tank and replacing the pump. The fuel pressure regulator is simple, it's right on your fuel rail under your hood. It's essential for dialing in the correct fuel pressure for a proper tune. Your stock fuel pressure regulator isn't adjustable, so you just replace it with an adjustable unit. If your making 300hp, it's a good time to go to 24's. You won't need anymore than that unless you go with a poweradder in the future. Like already suggestion, you need a mass air meter calibrated for larger injectors, so be sure to get that too.

January 25th, 2006, 03:32 PM	#11
streetstang06 Newbie Join Date: Jan 2006 Posts: 17	Thanks for all that info! I also have a question about the MAF now. How do you recalibrate the MAF for the 24# injectors? Or do i just need a new one?

January 25th, 2006, 08:17 PM	#12
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,941	You won't be able to calibrate it yourself, you will need to buy an aftermarket unit. You may be able to get a \ tune to correct for the injector change, but it's best just to get the right MAF.

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January 27th, 2006, 02:28 AM	#13
Hotrodvdog Newbie Join Date: Dec 2005 Posts: 6	Fuel pump swap is not hard. Relieve fuel pressure, undo fuel pump fuse, turn on ignition twice but don't start engine, disconnect battery, take gas cap off, undo 3 bolts that hold filler neck in gas cap compartment, support tank with car jack, undo straps(2 bolts), undo power cable, lower tank slowly, undo bolts to tank assembly, pull out fuel pump basket, take top off by pressing tabs on side of basket, lift up basket assembly, replace pump, everything else in reverse to reassemble. If you're upgrading to a Walboro, you will need to remove some material from the top of the assembly where it meets the fuel pump. I used a Dremel with a cut off wheel and it fit nicely. Very clean install. I installed a Walboro gss341. And many people said it wouldn't work. Vortech engineering carries this pump for 98-04 Mustang GTs.

February 26th, 2006, 08:47 PM	#15
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,941	Yes, Cobra MAF and injectors are 24# from 93 up to 02 (well, until the 03 Cobra that is).