HELP! What size injectors

91 5.0 lx hatch · January 2nd, 2008, 03:55 PM

i got a 93 5.0 lx notch

and it runs like crap and i can barely get it started!!! i think i have 30lb injectors not so sure!!! i have an edelbrock performer setup with a ford racing b cam my question is wat size injectors? 19lbs or 24lbs?

White Thunder · January 2nd, 2008, 04:01 PM

19's are stock.....go with the 24's and get a 255 walbro while your at it.....new fuel filter....i hope you dont think this will automaticly fix your problem

Casper98GT · January 2nd, 2008, 04:28 PM

i hope you have a MAf to match ? 30's are fine for that setup. If it doesnt start very well, i would start the normal diag.

Darrell · January 2nd, 2008, 04:31 PM

Originally Posted by 91 5.0 lx hatch

i got a 93 5.0 lx notch and it runs like crap and i can barely get it started!!! i think i have 30lb injectors not so sure!!! i have an edelbrock performer setup with a ford racing b cam my question is wat size injectors? 19lbs or 24lbs?

30lb injectors won't hurt but 19lb injectors are more than enough.

ChrisJ · January 2nd, 2008, 04:32 PM

nolife · January 2nd, 2008, 05:30 PM

What color are your injectors? 30# are red. Whatever you decide, don't forget you will need a MAF that is sized or calibrated for that specific injector size.

e3sean · January 2nd, 2008, 05:38 PM

Originally Posted by nolife

What color are your injectors? 30# are red. Whatever you decide, don't forget you will need a MAF that is sized or calibrated for that specific injector size.

+1 if u just slap 30lb injectors on without calibrating it it will run like crap..

e3sean · January 2nd, 2008, 05:40 PM

do u have a stock fuel pump

ChrisJ · January 2nd, 2008, 05:51 PM

sneezingfox · January 2nd, 2008, 08:42 PM

Awesome charts!

Iwannagofast · January 3rd, 2008, 04:07 AM

no kiddin......according to those ill be just fine with a 255 lph pump and 42 lb injectors

nolife · January 3rd, 2008, 09:59 AM

Each setup is different but once you get up to 42lb injectors, there is a good chance you will have idle quality issues without some type of custom chip or programming. Some people do not have problems but some people do, I'm sure the cam and intake combination has a lot to do with it as well.

MotorSports Digest has some charts that show the effective injector size for those that use increased fuel pressure or an FMU as well.

Speedstang302 · January 3rd, 2008, 11:02 AM

he's be fine with 19s...better with 24lbs and doesnt need 30lbers...

nice charts chris..

and a 190lph pump will be fine for that set-up...

Iwannagofast · January 3rd, 2008, 12:04 PM

Originally Posted by nolife

Each setup is different but once you get up to 42lb injectors, there is a good chance you will have idle quality issues without some type of custom chip or programming. Some people do not have problems but some people do, I'm sure the cam and intake combination has a lot to do with it as well.

MotorSports Digest has some charts that show the effective injector size for those that use increased fuel pressure or an FMU as well.

yeah im definately goin to go for a dyno tune once my car is done....i have always not only does it make it more streetable and everything it can give ya 30 to 40 horse power on a high hp motor

tehdwarvenn · January 3rd, 2008, 07:26 PM

so what size injectors would go for a 350 hp turbo'ed 302? does it matter if the hp is from forced induction or compression?

nolife · January 3rd, 2008, 09:42 PM

In general, forced induction will need a larger injector for the same HP.
This site has a generic fuel injector calculator with a basic explanation
Injector Selection Guide
The difference is the "Brake Specific Fuel Consumption" value. I have no idea how much these calculations work out in real life situations.

imported_Gt_Jay · January 3rd, 2008, 09:53 PM

So if i'am reading the chart right you can use a 155lph with 24lbs injectors, right everyone

Darrell · January 3rd, 2008, 10:50 PM

Originally Posted by imported_Gt_Jay

So if i'am reading the chart right you can use a 155lph with 24lbs injectors, right everyone

I will respond to that with a question. Why would you install a 155lph pump and not a 255lph pump?

imported_Gt_Jay · January 3rd, 2008, 11:53 PM

Originally Posted by Darrell

I will respond to that with a question. Why would you install a 155lph pump and not a 255lph pump?

JW if you could.

White Thunder · January 3rd, 2008, 11:55 PM

he is saying that there around the same price you should just go with the 255...be easier for the future

January 2nd, 2008, 03:55 PM	#1
91 5.0 lx hatch Regular 1993 5.0 notchback Join Date: Feb 2007 Location: Hawthorne,ca Posts: 86	HELP! What size injectors i got a 93 5.0 lx notch and it runs like crap and i can barely get it started!!! i think i have 30lb injectors not so sure!!! i have an edelbrock performer setup with a ford racing b cam my question is wat size injectors? 19lbs or 24lbs? __________________ 93 5.0 notch-b303 cam,performer rpm heads,performer upper and lower,70mmthrottle body,shorty headers,h-pipe,flows,cai,1.7rr,built aod 91 5.0 lx hatch-Sold 92 5.0 lx hatch-Sold

January 2nd, 2008, 04:32 PM	#5
ChrisJ MuchCoolerThanGTsetGO 2002 Mustang GT SLOW Join Date: Jun 2006 Location: Shepherdsville, Kentucky Posts: 16,399	__________________ My Junk www.myspace.com/cjobe

January 2nd, 2008, 05:30 PM	#6
nolife Hardcore Enthusiast Join Date: Dec 2006 Posts: 1,226	What color are your injectors? 30# are red. Whatever you decide, don't forget you will need a MAF that is sized or calibrated for that specific injector size. __________________ 1991 GT - Original owner, all stock 1988 GT - The project car

January 2nd, 2008, 05:51 PM	#9
ChrisJ MuchCoolerThanGTsetGO 2002 Mustang GT SLOW Join Date: Jun 2006 Location: Shepherdsville, Kentucky Posts: 16,399	__________________ My Junk www.myspace.com/cjobe

January 3rd, 2008, 09:59 AM	#12
nolife Hardcore Enthusiast Join Date: Dec 2006 Posts: 1,226	Each setup is different but once you get up to 42lb injectors, there is a good chance you will have idle quality issues without some type of custom chip or programming. Some people do not have problems but some people do, I'm sure the cam and intake combination has a lot to do with it as well. MotorSports Digest has some charts that show the effective injector size for those that use increased fuel pressure or an FMU as well. __________________ 1991 GT - Original owner, all stock 1988 GT - The project car Last edited by nolife : January 3rd, 2008 at 10:04 AM.

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January 2nd, 2008, 05:40 PM	#8
e3sean MM Fanatic 1988 lx 5.7 11.6@109 Join Date: Nov 2007 Location: arizona Posts: 3,577	do u have a stock fuel pump

January 2nd, 2008, 08:42 PM	#10
sneezingfox Regular Join Date: Nov 2007 Location: Murfreesboro, TN Posts: 294	Awesome charts!

January 3rd, 2008, 04:07 AM	#11
Iwannagofast Hardcore Enthusiast 1990 Mustang GT 9.39@76.09----1/8th mile Join Date: Feb 2007 Location: Arkansas Posts: 1,829	no kiddin......according to those ill be just fine with a 255 lph pump and 42 lb injectors

January 3rd, 2008, 11:02 AM	#13
Speedstang302 MM Fanatic 1989 Mustang LX 5.0 12.86@ 111mph Join Date: Apr 2007 Location: Massachusetss Posts: 4,622	he's be fine with 19s...better with 24lbs and doesnt need 30lbers... nice charts chris.. and a 190lph pump will be fine for that set-up... __________________ 1989 Mustang LX 5.0 347ci stroker tremec 3550 edelbrock heads, comp cam, vic jr intake, 750cfm 4150 holley 11.736@119.868mph SOLDSOLDSOLD LOOKING FOR A NEW 5.0... must be 90-93 black 5.0 5spd GT...PM with replys!!!

January 3rd, 2008, 07:26 PM	#15
tehdwarvenn Regular Join Date: May 2007 Location: Columbia SC Posts: 294	so what size injectors would go for a 350 hp turbo'ed 302? does it matter if the hp is from forced induction or compression? __________________ 1993 Mustang GT, catless h-pipe, bbk shorties, 40 series flows, bbk rear suspension, edelbrock front suspension, AUTOLITES!!! =), k&n, underdrives, 3.73's

January 3rd, 2008, 09:42 PM	#16
nolife Hardcore Enthusiast Join Date: Dec 2006 Posts: 1,226	In general, forced induction will need a larger injector for the same HP. This site has a generic fuel injector calculator with a basic explanation Injector Selection Guide The difference is the "Brake Specific Fuel Consumption" value. I have no idea how much these calculations work out in real life situations. __________________ 1991 GT - Original owner, all stock 1988 GT - The project car

January 3rd, 2008, 09:53 PM	#17
imported_Gt_Jay Regular 1993 Mustang LX N/A Join Date: Nov 2007 Location: Terrell, tx Posts: 209	So if i'am reading the chart right you can use a 155lph with 24lbs injectors, right everyone __________________ Fastfordsoftexascc.com

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