Bigger fuel injectors?

mustang416 · January 17th, 2011, 01:09 PM

So I just ordered new cams, throttle body, heads, and intake. Should I upgrade my fuel injectors also? I was planning on using the stock ones and didn't want to spend the money in them really. But if I get them would I have to get a bigger fuel pump?

Bullitt95 · January 17th, 2011, 01:58 PM

How many cams did you order? After all, you only need one.

Any time you upgrade the H/C/I, you definitely need to upgrade the fuel pump (255lph) and the injectors (24lb).

hotmustang95 · January 17th, 2011, 09:23 PM

What heads? I'm still using 19's with my gt-40 heads and stock cam. Their at their limit but still work fine. 19's can support up to 300hp.

ryanw · January 17th, 2011, 09:54 PM

Originally Posted by Bullitt95

Any time you upgrade the H/C/I, you definitely need to upgrade the fuel pump (255lph) and the injectors (24lb).

Originally Posted by hotmustang95

What heads? I'm still using 19's with my gt-40 heads and stock cam. Their at their limit but still work fine. 19's can support up to 300hp.

I think both comments are good. Ya 19 lb injectors are good to 300hp but it wont hurt you to upgrade your fuel pump (255lph) and go with 24lb injectors. You can get the injectors used and save some money, as for the pump i would buy that new, $100-$120

s351r13 · January 17th, 2011, 11:52 PM

24lb inj would be a good upgrade. You will need a new mass air. You can find used ones on the corral or on craigslist. Like mentioned above, buy the fuel pump new. Ebay has them in the 100-120 range.

Bullitt95 · January 18th, 2011, 12:33 AM

Originally Posted by hotmustang95

19's can support up to 300hp.

Not quite. You can run 19lb injectors at stock fuel pressure up to 275hp (crank) but beyond that, you'll need to raise the fuel pressure. I have mine at 45psi with the stock injectors and I'm at 315-320hp (crank).
At the 340hp (crank) level, 19lb injectors are maxed out at 100% duty cycle and stock fuel pressure but that's with more efficient heads and a BSFC of 0.45. A set of 24lb injectors would drop the duty cycle to a safe 80% at the 340hp level.

mustang416 · January 18th, 2011, 04:29 PM

I have the GT40p heads. If I got the 24lb injectors wont i need to get a tune for that? I know that our cars are hard as hell to tune and I dont have a speed shop around locally to do a dyno tune, so know of anything to buy to tune it right?

AdderMk2 · January 18th, 2011, 05:29 PM

they arent hard to tune at all.. Its just that your average mustang tuner is used to the caveman style a9l computer

mustang416 · January 18th, 2011, 06:10 PM

So what would I need to get to tune it?

Bullitt95 · January 19th, 2011, 01:00 PM

Originally Posted by mustang416

I have the GT40p heads. If I got the 24lb injectors wont i need to get a tune for that?

No, as long as you have an aftermarket MAF that's calibrated for 24lb injectors and run the stock fuel pressure, you should be fine. It's the cam swap that invariably sends the computer into a hissy fit but it's not an issue as long as the valve opening/closing events are reasonably close to stock.

January 17th, 2011, 01:09 PM	#1
mustang416 Newbie 1994 Mustang Gt Join Date: Sep 2010 Location: Traverse City,MI Posts: 19 iTrader: 0 reviews	Bigger fuel injectors? So I just ordered new cams, throttle body, heads, and intake. Should I upgrade my fuel injectors also? I was planning on using the stock ones and didn't want to spend the money in them really. But if I get them would I have to get a bigger fuel pump?

January 17th, 2011, 01:58 PM	#2
Bullitt95 Hardcore Enthusiast 1995 Mustang GT auto 13.546 @ 105.32 Join Date: Apr 2007 Location: Al Ain, UAE Posts: 1,452 iTrader: 0 reviews	How many cams did you order? After all, you only need one. Any time you upgrade the H/C/I, you definitely need to upgrade the fuel pump (255lph) and the injectors (24lb). __________________ 243.5rwhp/284.2rwtq Mod list in My Garage

January 17th, 2011, 09:23 PM	#3
hotmustang95 Regular Last of the 302's Road Racing Rookie Join Date: Sep 2009 Location: Boynton Beach, FL Posts: 373 iTrader: 0 reviews	What heads? I'm still using 19's with my gt-40 heads and stock cam. Their at their limit but still work fine. 19's can support up to 300hp. __________________ Victor ( goofyfeet) Oliver P.B.M.C. Member Track Addict

January 17th, 2011, 11:52 PM	#5
s351r13 Regular 1996 Saleen S351 Join Date: Jan 2008 Location: Manhattan,KS / Newnan,GA Posts: 173 iTrader: 0 reviews	24lb inj would be a good upgrade. You will need a new mass air. You can find used ones on the corral or on craigslist. Like mentioned above, buy the fuel pump new. Ebay has them in the 100-120 range. __________________ 96 S351 #13 99 S351 #14 99 S351 #46 94 S351 #35 95 S351 #43 00 S281 #417 02 S281SC #117

January 18th, 2011, 05:29 PM	#8
AdderMk2 Banned Join Date: Aug 2007 Location: al-Ahhmadi, Kuwait Posts: 991 iTrader: 0 reviews	they arent hard to tune at all.. Its just that your average mustang tuner is used to the caveman style a9l computer __________________ [URL="http://providence.craigslist.org/cto/2148862880.html"]1994 Cobra For Sale[/URL] [SIGPIC][/SIGPIC] [QUOTE=Timm10221]Its only a 10 inch Tach that sits right in the center of the dash with LED lights and a Spinner bezel that has dimonds and gold plating.. And when you hit 4500 plus is sounds off (AAHHH SHITT) :cool:[/QUOTE]

January 18th, 2011, 04:29 PM	#7
mustang416 Newbie 1994 Mustang Gt Join Date: Sep 2010 Location: Traverse City,MI Posts: 19 iTrader: 0 reviews	I have the GT40p heads. If I got the 24lb injectors wont i need to get a tune for that? I know that our cars are hard as hell to tune and I dont have a speed shop around locally to do a dyno tune, so know of anything to buy to tune it right?

January 18th, 2011, 06:10 PM	#9
mustang416 Newbie 1994 Mustang Gt Join Date: Sep 2010 Location: Traverse City,MI Posts: 19 iTrader: 0 reviews	So what would I need to get to tune it?

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