Picking injectors?

Burn'nRubber · February 19th, 2009, 01:10 AM

Motor is about done, just gotta pick up pushrods and some rocker arms. Specs: 306ci, srp forged flat-tops, comp xe-270 cam, performer intake, gt40p heads, etc. Looking to get a set a new set of injectors because I think I will be close to maxing out the 19lb'rs. Since I plan on spraying(100-150 hp dry shot) this summer, I was wondering what size to get? Until then, it will be naturally aspirated, though.

Thanks

superbean · February 19th, 2009, 01:12 AM

good rule of thumb for 19lb injectors are 300hp..

I would put some 42lbs in there and be done with it. Those will flow enough fuel for whatever spray you want to use.

89LX347 · February 19th, 2009, 03:08 AM

woah 42's? no no no. thats way over kill. put the 24's and you will be good.

flattusmaximus78 · February 19th, 2009, 08:21 AM

If you decide to go go 30lbers let me know. I have a pair for 100 bucks used.

baine21225 · February 19th, 2009, 09:45 AM

what is your overall hp going to be?

Burn'nRubber · February 19th, 2009, 10:13 AM

I really dont know, im hoping for around 280-300hp N/A, and eventually the 150 shot on top. So roughly 400-450hp on the smack.

baine21225 · February 19th, 2009, 10:19 AM

well with 450 flywheel and a .57 b.s.f.c. and 90% of max duty cycle thats about a 35 lb/hr injector

grnstang · February 19th, 2009, 10:39 AM

yeah 30's should be ok for what you will be doing

flyin ryan · February 19th, 2009, 11:08 AM

I wouldn't go as big as 42lbers unless you absolutely have to.. I can't stand the hard start conditions the green tops give. Requires a little more tuning to cure that issue

superbean · February 19th, 2009, 08:06 PM

Originally Posted by flyin ryan

I wouldn't go as big as 42lbers unless you absolutely have to.. I can't stand the hard start conditions the green tops give. Requires a little more tuning to cure that issue

playing with injector latency is a bitch.. went through that on my nissan --- DEATH

89lx · February 19th, 2009, 08:48 PM

heres a chart i used

Burn'nRubber · February 19th, 2009, 10:18 PM

Thanks every1, prolly going to go with either 30's or 36's.....

baine21225 · February 19th, 2009, 10:27 PM

if its between those two then get the 36

superbean · February 19th, 2009, 10:39 PM

remember you can use a smaller injector and bump up fuel pressure a hair.

Rage Wraps · February 20th, 2009, 04:20 PM

30#'s would be more than enough for what you are doing. Make sure yu have a decent pump in the back. Walbro 255 intank would be nice.

February 19th, 2009, 01:10 AM	#1
Burn'nRubber Regular 1992 Mustang GT Coming soon... Join Date: Aug 2007 Location: Rushville, IN Posts: 253 iTrader: 0 reviews	Picking injectors? Motor is about done, just gotta pick up pushrods and some rocker arms. Specs: 306ci, srp forged flat-tops, comp xe-270 cam, performer intake, gt40p heads, etc. Looking to get a set a new set of injectors because I think I will be close to maxing out the 19lb'rs. Since I plan on spraying(100-150 hp dry shot) this summer, I was wondering what size to get? Until then, it will be naturally aspirated, though. Thanks __________________ 1992 Hatch: 306ci, gt40p's, comp xe270, Edelbrock Performer, 1.6 r/r, full bolt-ons, and some supension work Last edited by Burn'nRubber; February 19th, 2009 at 01:13 AM.

February 19th, 2009, 01:12 AM	#2
superbean Hardcore Enthusiast 1998 Cobra 13.24@105.66 Join Date: Aug 2008 Location: North Carolina Posts: 1,778 iTrader: 0 reviews	good rule of thumb for 19lb injectors are 300hp.. I would put some 42lbs in there and be done with it. Those will flow enough fuel for whatever spray you want to use. __________________ weeee foooord!

February 19th, 2009, 03:08 AM	#3
89LX347 Hardcore Enthusiast Join Date: Apr 2007 Posts: 1,304 iTrader: 0 reviews	woah 42's? no no no. thats way over kill. put the 24's and you will be good. __________________ I believe in art when it is not seen. I believe in music when it is not audible. I believe in God when He is silent.

February 19th, 2009, 08:21 AM	#4
flattusmaximus78 I Post Entirely Way Too Much 1993 5.ohhhh 12.97 @140mph Join Date: Apr 2006 Location: Gatorland Posts: 6,122 iTrader: 3 reviews	If you decide to go go 30lbers let me know. I have a pair for 100 bucks used. __________________ 02 Pewter z28, hoosiers/lid/exhaust/spray...125mph 1993 gt Sold, already missed --Moates Quarter horse $225-- --Cobra intake $150-- --tremec 3550 bell and shifter $1100--

February 19th, 2009, 09:45 AM	#5
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,349 iTrader: 1 reviews	what is your overall hp going to be? __________________ "That's how Dad did it, that's how America does it... and it's worked out pretty well so far..."

February 19th, 2009, 10:13 AM	#6
Burn'nRubber Regular 1992 Mustang GT Coming soon... Join Date: Aug 2007 Location: Rushville, IN Posts: 253 iTrader: 0 reviews	I really dont know, im hoping for around 280-300hp N/A, and eventually the 150 shot on top. So roughly 400-450hp on the smack. __________________ 1992 Hatch: 306ci, gt40p's, comp xe270, Edelbrock Performer, 1.6 r/r, full bolt-ons, and some supension work

February 19th, 2009, 10:19 AM	#7
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,349 iTrader: 1 reviews	well with 450 flywheel and a .57 b.s.f.c. and 90% of max duty cycle thats about a 35 lb/hr injector __________________ "That's how Dad did it, that's how America does it... and it's worked out pretty well so far..."

February 19th, 2009, 10:39 AM	#8
grnstang Hardcore Enthusiast 91 LX 13.7@101 Join Date: Oct 2008 Location: Norwalk OH Posts: 1,426 iTrader: 1 reviews	yeah 30's should be ok for what you will be doing __________________

February 19th, 2009, 11:08 AM	#9
flyin ryan Banned Join Date: Jun 2008 Posts: 3,387 iTrader: 0 reviews	I wouldn't go as big as 42lbers unless you absolutely have to.. I can't stand the hard start conditions the green tops give. Requires a little more tuning to cure that issue

February 19th, 2009, 08:48 PM	#11
89lx Regular 1989 LX coupe 5.0L Join Date: Dec 2007 Location: NS Canada Posts: 496 iTrader: 0 reviews	heres a chart i used Attached Thumbnails __________________

February 19th, 2009, 10:18 PM	#12
Burn'nRubber Regular 1992 Mustang GT Coming soon... Join Date: Aug 2007 Location: Rushville, IN Posts: 253 iTrader: 0 reviews	Thanks every1, prolly going to go with either 30's or 36's..... __________________ 1992 Hatch: 306ci, gt40p's, comp xe270, Edelbrock Performer, 1.6 r/r, full bolt-ons, and some supension work

February 19th, 2009, 10:27 PM	#13
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,349 iTrader: 1 reviews	if its between those two then get the 36 __________________ "That's how Dad did it, that's how America does it... and it's worked out pretty well so far..."

February 19th, 2009, 10:39 PM	#14
superbean Hardcore Enthusiast 1998 Cobra 13.24@105.66 Join Date: Aug 2008 Location: North Carolina Posts: 1,778 iTrader: 0 reviews	remember you can use a smaller injector and bump up fuel pressure a hair. __________________ weeee foooord!

February 20th, 2009, 04:20 PM	#15
Rage Wraps Newbie Join Date: Feb 2009 Posts: 33 iTrader: 0 reviews	30#'s would be more than enough for what you are doing. Make sure yu have a decent pump in the back. Walbro 255 intank would be nice.

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