Which size injectors?

Dave_mustang_50 · 11-01-2003, 10:39 AM

Ok, I`ve decided to get larger injectors and lose the fmu. The procharger can be pullied at 14 or 20. Would a 42 lb injector work for both if I ever change out the pulley? Or should I go larger since i`m upgrading?
Thanks for replies

pello3 · 11-01-2003, 09:51 PM

Just to give you an idea, I have 30# injectors on my 94 GT. I have a powerdyne with 9psi. I have a few other bolt-ons but my motor is stock. You should go with 36# injectors if you plan to run the 14psi. I have my fuel pressure turned down to 34 psi. Good luck!!! Let me know how you make out.

speedytang · 11-03-2003, 02:55 AM

42lb . You can build 650hp.

Dave_mustang_50 · 11-03-2003, 05:01 PM

Yup, I talked to my speed shop today and were going with 42`s.
Thanks

ArtMan · 11-14-2003, 08:43 AM

Hope you don't mind me chiming in to disagree with your speed shop, but I don't want to hear about you blowing the engine because you were lean.

I don't think that's enough injector for a 20 psi set up. Running a Procharger at 20 psi on a 331 cubic inch motor is going to make awesome power and comensurate fuel demands.

If I were you I'd give Jimmy LaRocca a call. He is expert with Prochargers and tuning. I think he's going to tell you its time for low impedance injectors at about 72#/hr.

Can I also suggest you consider a more aggressive cam and a 75 mm throttle body?

Dave_mustang_50 · 11-14-2003, 05:19 PM

I dont mind at all, thats why I posted my question. I decided to stay with 42`s after seeing the injector price difference. I doubt I will ever change the pulley anyway. I agree about the cam though. After I dyno the engine with the procharger I might make a swap.
Thanks for the info though

mustangman4 · 12-04-2003, 02:53 AM

At 20lb of boost you will also need to start thinking about head gaskets and things of that nature. Is that an O-ringed DSS motor. Just wondering. I just got done installing a Super Pro 306 in mine just curious on how its holding up.

Thanks,
Brad

Dave_mustang_50 · 12-04-2003, 05:29 PM

I dont plan on ever changing the pulley to 20#. I`m pretty sure this will be the end of perf. mods to the car. Its not o-ringed. I`d rather blow a gasket than more expensive stuff. As far as the 331 goes, I love it. Even with 8.6:1 comp. I can break the Nittos during 2nd gear, Hopefully I can get it dynoed before and after the procharger install.
Everything good with your 306?

mustangman4 · 12-05-2003, 09:15 PM

Everything is good as far as the whole motor goes. I have only had it in for about a month now so it may be a little early to tell. Just got the charger back on like two weeks ago. Took it out for a good ride today. Now its time for it to snow and get cold here in WI. Seems like everything is still there. Good luck with the combo keep me updated on your project. mell_o_man@yahoo.com

Thanks,
Brad

93 GT 306 DSS, O-Ringed, AFR 185's, Pro Products Intakes 42lb inj 80mm Pro-M meter, PMS, AFM Power Pipe, Kirban Reg, Vortech S-Trim 14lbs. No times yet. Season is now over in WI.

11-01-2003, 10:39 AM	#1
Dave_mustang_50 Registered Member Join Date: Aug 1999 Location: New Port Richey, Florida Posts: 483	Which size injectors? Ok, I`ve decided to get larger injectors and lose the fmu. The procharger can be pullied at 14 or 20. Would a 42 lb injector work for both if I ever change out the pulley? Or should I go larger since i`m upgrading? Thanks for replies __________________ 1969 Mach 1 351C with a c6(for now) Sold 92 Rag Top GT Procharged & intercooled DSS 331 LC Holley Systemax 2 Intake, Edelbrock RPM Heads,E 303 ,blow thru air meter, race bypass, 42 pph injectors,65mm tb,1.7 rr, Mac long tube headers w/off road H pipe, Force 2 catback, TKO,Pro 5.0, K&N, Alum DS,3 core radiator, subframe connectors,3.73`s, Nitto DR`s and a Heavy Foot.

11-01-2003, 09:51 PM	#2
pello3 Registered Member Join Date: Nov 2003 Location: Hawley, PA 18428 Posts: 1	The right injectors. Just to give you an idea, I have 30# injectors on my 94 GT. I have a powerdyne with 9psi. I have a few other bolt-ons but my motor is stock. You should go with 36# injectors if you plan to run the 14psi. I have my fuel pressure turned down to 34 psi. Good luck!!! Let me know how you make out.

11-03-2003, 05:01 PM	#4
Dave_mustang_50 Registered Member Join Date: Aug 1999 Location: New Port Richey, Florida Posts: 483	Yup, I talked to my speed shop today and were going with 42`s. Thanks __________________ 1969 Mach 1 351C with a c6(for now) Sold 92 Rag Top GT Procharged & intercooled DSS 331 LC Holley Systemax 2 Intake, Edelbrock RPM Heads,E 303 ,blow thru air meter, race bypass, 42 pph injectors,65mm tb,1.7 rr, Mac long tube headers w/off road H pipe, Force 2 catback, TKO,Pro 5.0, K&N, Alum DS,3 core radiator, subframe connectors,3.73`s, Nitto DR`s and a Heavy Foot.

11-14-2003, 08:43 AM	#5
ArtMan Registered Member Join Date: Dec 1998 Location: Scarsdale, NY Posts: 45	Have to disagree Hope you don't mind me chiming in to disagree with your speed shop, but I don't want to hear about you blowing the engine because you were lean. I don't think that's enough injector for a 20 psi set up. Running a Procharger at 20 psi on a 331 cubic inch motor is going to make awesome power and comensurate fuel demands. If I were you I'd give Jimmy LaRocca a call. He is expert with Prochargers and tuning. I think he's going to tell you its time for low impedance injectors at about 72#/hr. Can I also suggest you consider a more aggressive cam and a 75 mm throttle body?

11-14-2003, 05:19 PM	#6
Dave_mustang_50 Registered Member Join Date: Aug 1999 Location: New Port Richey, Florida Posts: 483	I dont mind at all, thats why I posted my question. I decided to stay with 42`s after seeing the injector price difference. I doubt I will ever change the pulley anyway. I agree about the cam though. After I dyno the engine with the procharger I might make a swap. Thanks for the info though __________________ 1969 Mach 1 351C with a c6(for now) Sold 92 Rag Top GT Procharged & intercooled DSS 331 LC Holley Systemax 2 Intake, Edelbrock RPM Heads,E 303 ,blow thru air meter, race bypass, 42 pph injectors,65mm tb,1.7 rr, Mac long tube headers w/off road H pipe, Force 2 catback, TKO,Pro 5.0, K&N, Alum DS,3 core radiator, subframe connectors,3.73`s, Nitto DR`s and a Heavy Foot.

11-03-2003, 02:55 AM	#3
speedytang Registered Member Join Date: Oct 1999 Location: Marengo, Ohio.USA Posts: 135	42lb . You can build 650hp.

12-04-2003, 02:53 AM	#7
mustangman4 Registered Member Join Date: Feb 2003 Location: Oshkosh WI Posts: 69	At 20lb of boost you will also need to start thinking about head gaskets and things of that nature. Is that an O-ringed DSS motor. Just wondering. I just got done installing a Super Pro 306 in mine just curious on how its holding up. Thanks, Brad

12-04-2003, 05:29 PM	#8
Dave_mustang_50 Registered Member Join Date: Aug 1999 Location: New Port Richey, Florida Posts: 483	I dont plan on ever changing the pulley to 20#. I`m pretty sure this will be the end of perf. mods to the car. Its not o-ringed. I`d rather blow a gasket than more expensive stuff. As far as the 331 goes, I love it. Even with 8.6:1 comp. I can break the Nittos during 2nd gear, Hopefully I can get it dynoed before and after the procharger install. Everything good with your 306? __________________ 1969 Mach 1 351C with a c6(for now) Sold 92 Rag Top GT Procharged & intercooled DSS 331 LC Holley Systemax 2 Intake, Edelbrock RPM Heads,E 303 ,blow thru air meter, race bypass, 42 pph injectors,65mm tb,1.7 rr, Mac long tube headers w/off road H pipe, Force 2 catback, TKO,Pro 5.0, K&N, Alum DS,3 core radiator, subframe connectors,3.73`s, Nitto DR`s and a Heavy Foot.

12-05-2003, 09:15 PM	#9
mustangman4 Registered Member Join Date: Feb 2003 Location: Oshkosh WI Posts: 69	Everything is good as far as the whole motor goes. I have only had it in for about a month now so it may be a little early to tell. Just got the charger back on like two weeks ago. Took it out for a good ride today. Now its time for it to snow and get cold here in WI. Seems like everything is still there. Good luck with the combo keep me updated on your project. mell_o_man@yahoo.com Thanks, Brad 93 GT 306 DSS, O-Ringed, AFR 185's, Pro Products Intakes 42lb inj 80mm Pro-M meter, PMS, AFM Power Pipe, Kirban Reg, Vortech S-Trim 14lbs. No times yet. Season is now over in WI.

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