19# injector questions
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Junior User
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19# injector questions
I have some questions for those of you who have installed larger injectors in your six. I have a new motor going in (mine is rapidly dying after 390,000 orig miles on my 1990 F150 )and would like to get some more power. I have the K&N filter and had Gibson install a 3" mandrel bent exhaust from the engine back. I am already running really lean. To those of you who have put in larger injectors:
1. what does it do to your emmisions during testing?
2. how much does it affect your mileage?
3. does it affect the idle quality?
4. will it help maintain speed going up long grades? (I live in S. Calif and don't like being passed going up the Grapevine when loaded!)
5. what fuel pressure are you running? These injectors are use in Ford's 39psi systems is that in the ballpark for initial settings?
6. Would I be better off cranking up the fuel pressure with an AFPR to 60psi on stock injectors?
Lots of questions I know, but with a noisy connecting rod, I am in the market for more power!!!!!!
1. what does it do to your emmisions during testing?
2. how much does it affect your mileage?
3. does it affect the idle quality?
4. will it help maintain speed going up long grades? (I live in S. Calif and don't like being passed going up the Grapevine when loaded!)
5. what fuel pressure are you running? These injectors are use in Ford's 39psi systems is that in the ballpark for initial settings?
6. Would I be better off cranking up the fuel pressure with an AFPR to 60psi on stock injectors?
Lots of questions I know, but with a noisy connecting rod, I am in the market for more power!!!!!!
Freshman User
Joined: May 2001
Posts: 25
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19# injector questions
Hey Youngster,
It's time to leave this board and go to the one that eats, lives, and breathes this stuff.
Go to: http://pub41.ezboard.com/bfordsixcylinderperformanceforum
I'm in Texas, so I don't deal with the same problems that you have. But a lot of the guys on this board have and there is an article that discribes the swap in great detail. Ask them for a cam recommendation (a modest increase, I think) and head modifications affecting emitions. I'm pretty sure that a larger set of valves with pocket porting will not be bad at all.
I have not done the swap yet. But I will. What I have heared so far is:
Idle is unchanged
Drivability is much improved
Hot Start is improved
Gas Milage is effected only slightly or none at all
Read all the archives ( tons of info ) and enjoy.
How do you like the Cat-Back system you have? I'm comsidering it.
John
It's time to leave this board and go to the one that eats, lives, and breathes this stuff.
Go to: http://pub41.ezboard.com/bfordsixcylinderperformanceforum
I'm in Texas, so I don't deal with the same problems that you have. But a lot of the guys on this board have and there is an article that discribes the swap in great detail. Ask them for a cam recommendation (a modest increase, I think) and head modifications affecting emitions. I'm pretty sure that a larger set of valves with pocket porting will not be bad at all.
I have not done the swap yet. But I will. What I have heared so far is:
Idle is unchanged
Drivability is much improved
Hot Start is improved
Gas Milage is effected only slightly or none at all
Read all the archives ( tons of info ) and enjoy.
How do you like the Cat-Back system you have? I'm comsidering it.
John
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Junior User
Joined: May 2001
Posts: 63
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19# injector questions
john
My exhaust system is from the stock manifolds back. I had it custom made by Gibson at their shop in Yorba Linda. It is two three inch pipes going into a custom made "Y" into a high flow cat (3") and then through a gibson muffler. People comment on how big the exhaust tip is and think it's a sewer pipe not an a exhaust pipe! It has worked extremely well for over 100k miles and I cannot say enough good about the quality of workmanship. All bends are mandrel bent and it looks as good as it performs! Best single thing I did on the truck!
Sound is awesome although I usually use ear plugs when on long drives of over three hours. I can rumble by cars in a parking lot and set off car alarms without even trying!Good increase in hp and torque- been so long since I had it dynoed I have forgotten the exact gains.
My exhaust system is from the stock manifolds back. I had it custom made by Gibson at their shop in Yorba Linda. It is two three inch pipes going into a custom made "Y" into a high flow cat (3") and then through a gibson muffler. People comment on how big the exhaust tip is and think it's a sewer pipe not an a exhaust pipe! It has worked extremely well for over 100k miles and I cannot say enough good about the quality of workmanship. All bends are mandrel bent and it looks as good as it performs! Best single thing I did on the truck!
Sound is awesome although I usually use ear plugs when on long drives of over three hours. I can rumble by cars in a parking lot and set off car alarms without even trying!Good increase in hp and torque- been so long since I had it dynoed I have forgotten the exact gains.
Posting Guru
Joined: Dec 1999
Posts: 1,903
Likes: 2
From: Copley, OH
19# injector questions
The increase in thruput of a fuel injector is proportional to the square root of the pressure increase or decrease. The stock 12# @ 39 PSI injectors actually put out:
12# x (55/39)^0.5 = 14.3#, enough for about 154 HP
Increasing to 60 PSI gives only:
12# x (60/39)^0.5 = 14.9#, enough for about 161 HP
The highest you can go before the fuel pump stalls is about 70 PSI or:
12# x (70/39)^0.5 = 16.1#, enough for about 174 HP
19# @ 39 PSI injectors provide enough fuel for about 205 HP. The injectors will not make the HP, they will merely provide enough fuel to take advantage of other modifications you've made. So, if you're going to leave your engine close to stock internally and you have to pass a smog check, you might want to go with the adj. regulator and leave the injectors alone. Just get a CARB-approved AFPR and reset the pressure to 55 PSI when you go in for inspection. Nobody really yet knows what happens to emissions with the bigger injectors, I suspect that CA isn't the place to find out.
12# x (55/39)^0.5 = 14.3#, enough for about 154 HP
Increasing to 60 PSI gives only:
12# x (60/39)^0.5 = 14.9#, enough for about 161 HP
The highest you can go before the fuel pump stalls is about 70 PSI or:
12# x (70/39)^0.5 = 16.1#, enough for about 174 HP
19# @ 39 PSI injectors provide enough fuel for about 205 HP. The injectors will not make the HP, they will merely provide enough fuel to take advantage of other modifications you've made. So, if you're going to leave your engine close to stock internally and you have to pass a smog check, you might want to go with the adj. regulator and leave the injectors alone. Just get a CARB-approved AFPR and reset the pressure to 55 PSI when you go in for inspection. Nobody really yet knows what happens to emissions with the bigger injectors, I suspect that CA isn't the place to find out.
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