I wouldn't go any bigger than 30lb injectors..I don't think you will see more than 420-450hp to the tires with your setup. So you should be fine....
396 fuel injectors
Thread Starter
Pro
Joined: Aug 2001
Posts: 626
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From: Lake Lure NC
396 fuel injectors
I am building a 396 stroker and I understand there are Ford motor sports 36 lb injectors that can be used in the application. I have also been looking a the delphi 37 lb injectors. Which injector is better and is the 36 lb injector what most of you are running with a 395 combo?
Le Mans Master
Joined: Feb 2002
Posts: 5,970
Likes: 20
From: San Marcos Texas
The 36lb injectors are pretty large for you motor. Not that they wont work. It will just take a really good tuner. I run 26lb injectors at 50psi. Which puts them at about 28lb. I put down 440hp/405 torque to the tires and have plenty of room left in the injectors should I switch to a bigger cam and make more hp. The larger injectors will make it harder to get the tune spot on at part throttle and idle. Well thats my 2 cents. I'm sure you will get alot of responses for using the 24lb FMS injectors too. The a quiet a few guy running them with 434ci motors and 500+hp to the tires. 
End the end its your car and your choice. Talk to the guy who is going to tune you new engine. He is the one who has to work with them...
End the end its your car and your choice. Talk to the guy who is going to tune you new engine. He is the one who has to work with them...
Instructor
Joined: Sep 2003
Posts: 118
Likes: 1
From: Plano TX
I agree...36lb injectors are pretty large. They are good up to about 600HP. I'm running the SVT 30lb injectors @ 40 psi with a multitude of mods and getting almost 410HP (plenty of injector). A 36lb injector is good for the 450 to 600 range. You have any idea what this thing is going to do?
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
If I were you, and you are not tuning your own chip or pcm, I would follow your tuners advise on injector sizing and brand.
My tuner said the stock injectors are maxed out and I need a little more with my combo. He suggested the 30lb ford injectors. There are some people on this board running big motors and good times at the strip with small injectors. So it can be done. But for some reason when GM made the LT1 engine they used 23.8 lb injectors but when they went to the LT4 they increased the injector to a 28lb injector. Sure they could have programmed the computer to run with the 24's but they didnt. Why?, no one seems to know the answer. IMO it was probably a safety issue to make sure the engine does not go lean.
So to summerize, again I would go with your tuners advise and I dont believe that 30 or 36lb injectors are out of line for a 396 provided you have a tuner who can work with them.
My tuner said the stock injectors are maxed out and I need a little more with my combo. He suggested the 30lb ford injectors. There are some people on this board running big motors and good times at the strip with small injectors. So it can be done. But for some reason when GM made the LT1 engine they used 23.8 lb injectors but when they went to the LT4 they increased the injector to a 28lb injector. Sure they could have programmed the computer to run with the 24's but they didnt. Why?, no one seems to know the answer. IMO it was probably a safety issue to make sure the engine does not go lean.
So to summerize, again I would go with your tuners advise and I dont believe that 30 or 36lb injectors are out of line for a 396 provided you have a tuner who can work with them.
Last edited by 93 ragtop; Jun 1, 2005 at 06:23 AM.
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
I run the 36's with no problems. Who is tuning your car? Ask them what they want to see. My tuner wanted 42's but I called him when I got a great deal on my 36s and he said no problem he could tune with any injector from 24-42 but the 32-42s would give a better DC time. Here is my 2 cents, if you can go with a bigger injector and keep the DC times lower at or near the stock FP then why not, as long as the car can be tuned. All the stories of the car will run pig rich, wont tune, bad gas mileage, so on and so forth IMHO where because someone did not know how to tune correctly. My car has zero cam surge, gets 17MPG city 25 Hwy and the BLMs are 128 across the board and perfect AF on the wide band. Again my advices is getting a hold of your tuner and ask them.
Thread Starter
Pro
Joined: Aug 2001
Posts: 626
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From: Lake Lure NC
luvmy92. I thought about using Jim Smith however Jeremy Formato is local and will be tuning the car.
Thanks guys for all the help. I will be calling Jeremy to get him in the game since the engine is just a couple weeks out.
Thanks guys for all the help. I will be calling Jeremy to get him in the game since the engine is just a couple weeks out.
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