fuel injector questions

dragstang86 · 02-19-2003, 05:35 PM

I still have stock 19 lbs. and a stock maf so i figure i should upgrade at the same time. The question is what size injector should i get? I havnt had it on a dyno but i have to be pushing 300 rwhp and i am ordering a systemax or Rpm2 and have future plans of either a supercharger or the new Edelbrock plate system nitrous kit for the RPM 2 intake. The fuel injector calculator on this site says that i should have larger injectors already. Are my injectors holding it back any? It doesnt seem to starve for fuel.

Ford sells 2 sets of injectors, one matched set and one not. Does it make much of a difference? Is so ill go with the matched ones because i get a really good deal on motorsport parts through my work.

Thanks for the help

Murdock · 02-19-2003, 09:03 PM

That's good the 19's have gotten you this far. With adding the new intake 24's would do, but your going to need 30's/36's when you add boost/nitrous. Depends on the amount of boost/nitrous really, but I don't want you to under cut the fuel supply. Putting in 36's now with the stock ECM controller might run a little on the rich side, but can be helped with some tuning. However I would go with the matched set of injectors, they will give you better performance. I'd say to decide on either supercharging or nitrous before ordering a MAF meter. If your going to run boost get a Pro-M Blow Thru meter (75-80mm). If nitrous you could get a standard meter.

Murdock

dragstang86 · 02-19-2003, 10:13 PM

how much horsepower or what 1/4 times will i be capable with the 30 lbs. Can you go too big as long as the maf sensor is calibrated? I rather not have to buy new injectors again after a power adder.

thanks for the help

Murdock · 02-20-2003, 08:20 AM

If you can send me an email address I can send you a cool little stand alone program that I think will help you out, it's only about 108KB. I've put 36's in cars, you just have to find a happy medium with the fuel pressure, normally yes the MAF being calibrated for the size helps alot.

Murdock

02-19-2003, 05:35 PM	#1
dragstang86 Registered Member Join Date: Sep 2002 Location: baltimore, md Posts: 220	fuel injector questions I still have stock 19 lbs. and a stock maf so i figure i should upgrade at the same time. The question is what size injector should i get? I havnt had it on a dyno but i have to be pushing 300 rwhp and i am ordering a systemax or Rpm2 and have future plans of either a supercharger or the new Edelbrock plate system nitrous kit for the RPM 2 intake. The fuel injector calculator on this site says that i should have larger injectors already. Are my injectors holding it back any? It doesnt seem to starve for fuel. Ford sells 2 sets of injectors, one matched set and one not. Does it make much of a difference? Is so ill go with the matched ones because i get a really good deal on motorsport parts through my work. Thanks for the help __________________ 90 LX Hatchback 306, AFR 165's 58cc, E303, 1.6 roller rockers, 70mm throttle body, cobra intake, bbk fenderwell, bbk longtubes, x-pipe, flowmasters, pullies, msd 6a, crane ps-92, stock MAF sensor, electric fan, No AC, No air pump, flaming river quick ratio rack C-4, 3500 stall, 373's, aluminum driveshaft SSM Lift bars, , sub frame connectors, strut tower brace 12.57 @105.12mph w/ 1.686 60ft before bbk longtubes (with equal shorties) ----------------------------------------- 86 tube chassis coupe - the trailor queen

02-19-2003, 09:03 PM	#2
Murdock Registered Member Join Date: Dec 2002 Location: Columbus, OH Posts: 100	That's good the 19's have gotten you this far. With adding the new intake 24's would do, but your going to need 30's/36's when you add boost/nitrous. Depends on the amount of boost/nitrous really, but I don't want you to under cut the fuel supply. Putting in 36's now with the stock ECM controller might run a little on the rich side, but can be helped with some tuning. However I would go with the matched set of injectors, they will give you better performance. I'd say to decide on either supercharging or nitrous before ordering a MAF meter. If your going to run boost get a Pro-M Blow Thru meter (75-80mm). If nitrous you could get a standard meter. Murdock __________________ LARZRACECARS larzracecars.com

02-19-2003, 10:13 PM	#3
dragstang86 Registered Member Join Date: Sep 2002 Location: baltimore, md Posts: 220	how much horsepower or what 1/4 times will i be capable with the 30 lbs. Can you go too big as long as the maf sensor is calibrated? I rather not have to buy new injectors again after a power adder. thanks for the help __________________ 90 LX Hatchback 306, AFR 165's 58cc, E303, 1.6 roller rockers, 70mm throttle body, cobra intake, bbk fenderwell, bbk longtubes, x-pipe, flowmasters, pullies, msd 6a, crane ps-92, stock MAF sensor, electric fan, No AC, No air pump, flaming river quick ratio rack C-4, 3500 stall, 373's, aluminum driveshaft SSM Lift bars, , sub frame connectors, strut tower brace 12.57 @105.12mph w/ 1.686 60ft before bbk longtubes (with equal shorties) ----------------------------------------- 86 tube chassis coupe - the trailor queen

02-20-2003, 08:20 AM	#4
Murdock Registered Member Join Date: Dec 2002 Location: Columbus, OH Posts: 100	If you can send me an email address I can send you a cool little stand alone program that I think will help you out, it's only about 108KB. I've put 36's in cars, you just have to find a happy medium with the fuel pressure, normally yes the MAF being calibrated for the size helps alot. Murdock __________________ LARZRACECARS larzracecars.com

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