what size injectors

5.0TOGO1 · 02-03-2002, 10:57 PM

combo is tfs heads, edel intake, f cam,b-trim hope to make10# with a 7'' crank 2.95 blower pully, the car has 30# inj in it now and a pro-m 75 should i use the 30# or step up? i found a deal on some 30# that have been flowed by JMS to 47# and a meter to mach tell me what you think

LOWKEY · 02-04-2002, 01:13 AM

Stay away from those modified injectors. I've heard they don't have a good spray pattern at low loads. 30's and a 4 to 1 fmu would work well but 42's and no fmu would be better. They may be a little much but it always better to plan for the future. The lightning only makes 385hp with 42lb'ers, just goes to show that factory always over does it.

5.0TOGO1 · 02-04-2002, 10:08 AM

i called jms today and they said the same thing ,i think i will keep the 30# and run a fmu, but now i need a t rex i found out the nos pump i have is only rated at 45 psi my wife is gonna kill me lol

MiracleMax · 02-05-2002, 10:33 AM

30# injectors are good for about 430 HP in a natuarally aspirated application (using a Ford MAF), because BSFC. basically SUCKS in a blown motor this is a bit misleading. A 36# injector would be more appropriate for the same level of power. FMU's are a cheesy solution to a fuel problem in a MAF car. The best way to do it would be to get an accurate reading on HP then select an injector based on that info. Ideally if you could get then engine dyno'd with a BSFC. number, then selecting the injector would be a snap.

02-03-2002, 10:57 PM	#1
5.0TOGO1 Registered Member Join Date: Jan 2002 Posts: 4	what size injectors combo is tfs heads, edel intake, f cam,b-trim hope to make10# with a 7'' crank 2.95 blower pully, the car has 30# inj in it now and a pro-m 75 should i use the 30# or step up? i found a deal on some 30# that have been flowed by JMS to 47# and a meter to mach tell me what you think

02-04-2002, 01:13 AM	#2
LOWKEY Registered Member Join Date: Jan 2000 Location: greenvile, NC Posts: 161	Stay away from those modified injectors. I've heard they don't have a good spray pattern at low loads. 30's and a 4 to 1 fmu would work well but 42's and no fmu would be better. They may be a little much but it always better to plan for the future. The lightning only makes 385hp with 42lb'ers, just goes to show that factory always over does it. __________________ 89' Notch Stroked Poked & BLOWN low 11's and it goes around corners too Parts for Sale!! http://www.lowkey.stangnet.com/catalog.html

02-05-2002, 10:33 AM	#4
MiracleMax Registered Member Join Date: Apr 1999 Location: Hayes, Va, USA Posts: 798	30# injectors are good for about 430 HP in a natuarally aspirated application (using a Ford MAF), because BSFC. basically SUCKS in a blown motor this is a bit misleading. A 36# injector would be more appropriate for the same level of power. FMU's are a cheesy solution to a fuel problem in a MAF car. The best way to do it would be to get an accurate reading on HP then select an injector based on that info. Ideally if you could get then engine dyno'd with a BSFC. number, then selecting the injector would be a snap. __________________ 2002 5M GT (99% stock) 1991 5M LX (30% stock) patiently awaiting my satin silver 07 Mach 1, and don't forget the shaker

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02-04-2002, 10:08 AM	#3
5.0TOGO1 Registered Member Join Date: Jan 2002 Posts: 4	i called jms today and they said the same thing ,i think i will keep the 30# and run a fmu, but now i need a t rex i found out the nos pump i have is only rated at 45 psi my wife is gonna kill me lol