what injectors to use?

dragstang86 · 10-09-2002, 07:48 PM

My mph is low in the quarter (13.30 @99 with a 1.75 60ft leaving from an idle) and the car stops pulling on top end and think it might not be getting enough fuel? I still have 19lb injectors and the original MAF. Im getting ready to buy a Pro-M MAF so i was gonna upgrade injectors at the same time if needed? But with these mods what injectors should i be using? Would i gain anything by going with a 24lb?

306
c-4 tranny 3500 stall
gt-40p heads
cobra intake - ported lower
E303 cam
roller rockers
70mm throttle body
bbk fender well
shorties
x pipe
flowmasters
msd 6a
pullies
373's

thanks for the help,
bryan

90lx
86 coupe

bigblockcoupe · 10-09-2002, 09:20 PM

24's would be enough but if you plan on any future mods I would go with 30#.

dragstang86 · 10-09-2002, 10:08 PM

So do you think that the 19's are holding me back any right now? Im planning on plenty of future mods so ill go ahead with the 30's. Will this affect gas mileage any?

thanks for your help

LaxMan · 10-09-2002, 11:43 PM

How much Fuel pressure are you getting at the Top end?

I have seen a bunch of people get into the LOW 12's with 19's.

I would make sure the the Fuel Pressure regulator is working correctly along with the fuel pump first.

Also The convertor has a lot to do with how the top end turns out.

Mine falls on its face at the top ennd because of my converter but I will HOPEFULLY get that taken car of soon!

5ohCOUPE · 10-10-2002, 05:54 AM

Another thing that might be holding you back is the Stock Mass air meter. I run 19#s and I get 109 MPH on motor. I think it is the stock Mass air meter.

dragstang86 · 10-10-2002, 06:14 AM

Im gonna go ahead and order that MAF and check the fuel pressue. What would the ideal fuel pressure be goin down the track and at idle?

thanks for the help,
bryan

90lx
86 coupe

88workcar · 10-10-2002, 06:29 PM

Before you spend on a MAF get a fuel press reg and a guage. This will help you for the rest of your mustang days. Start at 39psi. Make 3 passes, then go up 2psi. If you pick up speed or ET go up again untill you see no gain. If you never see a gain you sure don't need 24s. What does your car weigh? I can't run nothing but 19s and I have been as fast as 113mph with them. At the time I should have had 375HP and supposably you can't do that. I never knew it though.

10-09-2002, 07:48 PM	#1
dragstang86 Registered Member Join Date: Sep 2002 Location: baltimore, md Posts: 220	what injectors to use? My mph is low in the quarter (13.30 @99 with a 1.75 60ft leaving from an idle) and the car stops pulling on top end and think it might not be getting enough fuel? I still have 19lb injectors and the original MAF. Im getting ready to buy a Pro-M MAF so i was gonna upgrade injectors at the same time if needed? But with these mods what injectors should i be using? Would i gain anything by going with a 24lb? 306 c-4 tranny 3500 stall gt-40p heads cobra intake - ported lower E303 cam roller rockers 70mm throttle body bbk fender well shorties x pipe flowmasters msd 6a pullies 373's thanks for the help, bryan 90lx 86 coupe

10-09-2002, 09:20 PM	#2
bigblockcoupe Registered Member Join Date: Aug 2002 Location: broken arrow Posts: 212	24's would be enough but if you plan on any future mods I would go with 30#. __________________ Rice Haters Club member #68 '93 Cobra 10.20@135 '89 Gt Coupe 12.20@115

10-09-2002, 11:43 PM	#4
LaxMan Registered Member Join Date: Jan 1999 Location: Sugarland, TX Posts: 458	How much Fuel pressure are you getting at the Top end? I have seen a bunch of people get into the LOW 12's with 19's. I would make sure the the Fuel Pressure regulator is working correctly along with the fuel pump first. Also The convertor has a lot to do with how the top end turns out. Mine falls on its face at the top ennd because of my converter but I will HOPEFULLY get that taken car of soon! __________________ 306DSS, AOD, T-Trim Vortech #3325 w/ driver 6.9882@100.33 1/8th

10-10-2002, 05:54 AM	#5
5ohCOUPE Registered Member Join Date: Sep 2001 Location: ORANGE PARK FL. USA Posts: 208	Another thing that might be holding you back is the Stock Mass air meter. I run 19#s and I get 109 MPH on motor. I think it is the stock Mass air meter. __________________ 91 LX COUPE, 3.73 gears, 2 1/2 inch H-Pipe, 1 5/8 MAC long tube headers, 73 MM C&L MAF, 70 MM MAC TB, LUNATI cam,1.7 TFS Rockers, TFS Track Heat heads, TFS Track Heat intake, T5 with PRO 5.0 shifter, Griffin aluminum radiator, Fluid Damper, SSM traction bars, 190 GPH in tank fuel pump. And more to come.

10-10-2002, 06:29 PM	#7
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	Before you spend on a MAF get a fuel press reg and a guage. This will help you for the rest of your mustang days. Start at 39psi. Make 3 passes, then go up 2psi. If you pick up speed or ET go up again untill you see no gain. If you never see a gain you sure don't need 24s. What does your car weigh? I can't run nothing but 19s and I have been as fast as 113mph with them. At the time I should have had 375HP and supposably you can't do that. I never knew it though. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

10-09-2002, 10:08 PM	#3
dragstang86 Registered Member Join Date: Sep 2002 Location: baltimore, md Posts: 220	So do you think that the 19's are holding me back any right now? Im planning on plenty of future mods so ill go ahead with the 30's. Will this affect gas mileage any? thanks for your help

10-10-2002, 06:14 AM	#6
dragstang86 Registered Member Join Date: Sep 2002 Location: baltimore, md Posts: 220	Im gonna go ahead and order that MAF and check the fuel pressue. What would the ideal fuel pressure be goin down the track and at idle? thanks for the help, bryan 90lx 86 coupe

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