The simpliest question about injectors

SlowStang2 · 07-26-2001, 02:33 PM

Look at my signature and tell me if you guys think the mass air/injector setup is too much right now. Would think be affecting my times?

------------------
94' Stang GT Convertible --Cobra upper&lower, Mac cold air w/K&N, BBK equal length shorties, BBK offroad H-pipe, American Thunder cat-back, BBK T/B 65mm, 24lb injectors, Pro-77mm MAM, pulleys, aluminum driveshaft, 3.55s, Steeda Tri-Ax shifter 14.4@100. (Sad, i know. i have stock heads)

89 Cobra LX · 07-26-2001, 02:43 PM

I just took my 24lb injectors off from the advice of my tuner. I put my 19s back on (take a look at my signature and you'll see my combo, I've got a bit more than you right now).

It's better to have a smaller injector and raise the fuel pressure. It provides a better spray pattern from the injector. You may need to invest in an adjustable fuel pressure regulator.

------------------
Eric - 89 Mustang LX coupe
302 - Cobra Intake - GT40p heads - TFS stage 1 cam - FRPP 1.6 roller rockers - Naturally Aspirated
3:73 gears - KYB shocks and struts - Eibach springs - HPM Mega-bite Jr lower control arms - HPM upper control arms

SlowStang2 · 07-26-2001, 03:26 PM

Whoops. I forgot to put that in my signature. I have an adjustable fuel regulator. I have seen replies on here before talking about injector size, but has anyone actually ran slower with bigger than needed injectors? If so, maybe thats why my times are lousy eh? So what do you think? Should I swap the injector/meter out for the stock ones? I don't want to mess with it if its unlikely to do anything.

------------------
94' Stang GT Convertible --Cobra upper&lower, Mac cold air w/K&N, BBK equal length shorties, BBK offroad H-pipe, American Thunder cat-back, BBK T/B 65mm, 24lb injectors, Pro-77mm MAM, pulleys, aluminum driveshaft, 3.55s, Steeda Tri-Ax shifter, adjustable fuel regulator 14.4@100. (Sad, i know. i have stock heads)

exgmguy · 07-26-2001, 04:03 PM

I dunno. I was running 30's with 28 psi @ WOT. I switched to 24's with 38 psi. I picked up nothing on the dyno. The numbers came back the same.

------------------
1988 Mustang GT
11.8 @ 123 (7/14/01)
1992 BadAzz Wrangler
1993 Explorer

LX90Stang · 07-26-2001, 05:28 PM

Slow,
check out the article in the latest 5.0 magazine it has a great article on this very same subject. It has a formula to tell ya if you need bigger or smaller injectors. Sometime bigger is not better, maybe this is tru for you. Hope the article helps.

07-26-2001, 02:33 PM	#1
SlowStang2 Registered Member Join Date: May 2001 Location: Stuart, FL, US Posts: 147	The simpliest question about injectors Look at my signature and tell me if you guys think the mass air/injector setup is too much right now. Would think be affecting my times? ------------------ 94' Stang GT Convertible --Cobra upper&lower, Mac cold air w/K&N, BBK equal length shorties, BBK offroad H-pipe, American Thunder cat-back, BBK T/B 65mm, 24lb injectors, Pro-77mm MAM, pulleys, aluminum driveshaft, 3.55s, Steeda Tri-Ax shifter 14.4@100. (Sad, i know. i have stock heads)

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07-26-2001, 02:43 PM	#2
89 Cobra LX Don Corlione Join Date: Jun 2001 Location: Omaha NE USA Posts: 491	I just took my 24lb injectors off from the advice of my tuner. I put my 19s back on (take a look at my signature and you'll see my combo, I've got a bit more than you right now). It's better to have a smaller injector and raise the fuel pressure. It provides a better spray pattern from the injector. You may need to invest in an adjustable fuel pressure regulator. ------------------ Eric - 89 Mustang LX coupe 302 - Cobra Intake - GT40p heads - TFS stage 1 cam - FRPP 1.6 roller rockers - Naturally Aspirated 3:73 gears - KYB shocks and struts - Eibach springs - HPM Mega-bite Jr lower control arms - HPM upper control arms

07-26-2001, 03:26 PM	#3
SlowStang2 Registered Member Join Date: May 2001 Location: Stuart, FL, US Posts: 147	Whoops. I forgot to put that in my signature. I have an adjustable fuel regulator. I have seen replies on here before talking about injector size, but has anyone actually ran slower with bigger than needed injectors? If so, maybe thats why my times are lousy eh? So what do you think? Should I swap the injector/meter out for the stock ones? I don't want to mess with it if its unlikely to do anything. ------------------ 94' Stang GT Convertible --Cobra upper&lower, Mac cold air w/K&N, BBK equal length shorties, BBK offroad H-pipe, American Thunder cat-back, BBK T/B 65mm, 24lb injectors, Pro-77mm MAM, pulleys, aluminum driveshaft, 3.55s, Steeda Tri-Ax shifter, adjustable fuel regulator 14.4@100. (Sad, i know. i have stock heads)

07-26-2001, 04:03 PM	#4
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	I dunno. I was running 30's with 28 psi @ WOT. I switched to 24's with 38 psi. I picked up nothing on the dyno. The numbers came back the same. ------------------ 1988 Mustang GT 11.8 @ 123 (7/14/01) 1992 BadAzz Wrangler 1993 Explorer

07-26-2001, 05:28 PM	#5
LX90Stang Registered Member Join Date: Nov 2000 Location: Kailua, HI, USA Posts: 21	Slow, check out the article in the latest 5.0 magazine it has a great article on this very same subject. It has a formula to tell ya if you need bigger or smaller injectors. Sometime bigger is not better, maybe this is tru for you. Hope the article helps.