Gonna need bigger injectors yet?

mustangman9550 · February 11th, 2007, 09:12 AM

So here's the deal, have a 94 Cobra with a 331 Stroker, built heads and matched ported polished flow-benched factory intake. I have a 255 lph fuel pump on order to install this week. Problem is I just found out I still have the stock 24 lb injectors. Anybody know how many horsepower on average the 24 lb injectors will support? Just needing to know what to expect after the fuel pump install......

Darrell · February 11th, 2007, 10:23 AM

Those injectors will be fine until you get near 420hp.

mustangman9550 · February 11th, 2007, 10:30 AM

Originally Posted by Darrell

Those injectors will be fine until you get near 420hp.

Thanks for the advice! I figured up to around 400. So I should be good till I add boost I guess. I'm hoping the pump helps me with my sputter at 4800 rpm's cuz having a stroker that starves that low in the rpm's is killing me right now!!! Good to know the stock Cobra injectors are so capable....

Darrell · February 12th, 2007, 06:10 AM

Originally Posted by mustangman9550

Thanks for the advice! I figured up to around 400. So I should be good till I add boost I guess. I'm hoping the pump helps me with my sputter at 4800 rpm's cuz having a stroker that starves that low in the rpm's is killing me right now!!! Good to know the stock Cobra injectors are so capable....

If you have a sputter you better find the problem now before you start adding more power.

mustangman9550 · February 18th, 2007, 11:53 AM

Thanks for all the advice guys! I purchased a 255 lph pump this week and installed a Aeromotive fuel pressure regulator. Definitely a night a day difference! Now my only problem is trying not to blow a head gasket because she's so much fun to rev past 5 to 6 grand..........took care of the initial start-up of the car too. No longer have to pat the gas like a carburated car.

mustangman9550 · February 18th, 2007, 11:54 AM

P.S. INTANK FUEL PUMPS SUCK BALLS!!!
Hope I never have to see that fuel tank again!!! lol

Stangzilla · March 2nd, 2007, 07:20 PM

Stangzilla wrote:
Ratings are calculated at 90% duty cycle at 43.5 psi fuel pressure..

19lb- 225-300hp

24lb- 300-385hp

30lb- 385-480hp

36lb- 480-575hp

42lb- 575-670hp

Oh yeah and remember thats flywheel hp not rear wheel hp...

I would not go over 400hp with the 24's

February 11th, 2007, 09:12 AM	#1
mustangman9550 Regular Join Date: Mar 2006 Location: Tuscaloosa,AL Posts: 153	Gonna need bigger injectors yet? So here's the deal, have a 94 Cobra with a 331 Stroker, built heads and matched ported polished flow-benched factory intake. I have a 255 lph fuel pump on order to install this week. Problem is I just found out I still have the stock 24 lb injectors. Anybody know how many horsepower on average the 24 lb injectors will support? Just needing to know what to expect after the fuel pump install...... __________________ http://i43.photobucket.com/albums/e3...n9550/must.jpg

February 11th, 2007, 10:23 AM	#2
Darrell Feb 08 ROTM 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: Fond du Lac, Wisconsin Posts: 7,026	Those injectors will be fine until you get near 420hp. __________________ Racing in memory of Dave Bandt 11/19/69 - 3/23/08 "he's traded his wheels for wings" Professor of Natural Aspiration Thanks to: Artie at Trick Flow, Dave at Team Z Motorsports, Brian at Total Engine Airflow and Harold at Furo Racecraft

February 18th, 2007, 11:53 AM	#5
mustangman9550 Regular Join Date: Mar 2006 Location: Tuscaloosa,AL Posts: 153	Thanks for all the advice guys! I purchased a 255 lph pump this week and installed a Aeromotive fuel pressure regulator. Definitely a night a day difference! Now my only problem is trying not to blow a head gasket because she's so much fun to rev past 5 to 6 grand..........took care of the initial start-up of the car too. No longer have to pat the gas like a carburated car. __________________ http://i43.photobucket.com/albums/e3...n9550/must.jpg

February 18th, 2007, 11:54 AM	#6
mustangman9550 Regular Join Date: Mar 2006 Location: Tuscaloosa,AL Posts: 153	P.S. INTANK FUEL PUMPS SUCK BALLS!!! Hope I never have to see that fuel tank again!!! lol __________________ http://i43.photobucket.com/albums/e3...n9550/must.jpg

March 2nd, 2007, 07:20 PM	#7
Stangzilla MM Fanatic Join Date: Aug 2006 Location: On my way to Baines's house!! Posts: 3,007	Stangzilla wrote: Ratings are calculated at 90% duty cycle at 43.5 psi fuel pressure.. 19lb- 225-300hp 24lb- 300-385hp 30lb- 385-480hp 36lb- 480-575hp 42lb- 575-670hp Oh yeah and remember thats flywheel hp not rear wheel hp... I would not go over 400hp with the 24's __________________ Rotating The Earth 1320 Feet At A Time!! The very existence of flamethrowers proves that sometime, somewhere, someone said to themselves, “You know, I want to set those people over there on fire, but I’m just not close enough to get the job done.”

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