injector size suggestions
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Tuned
Joined: Jul 2003
Posts: 359
Likes: 0
From: ga
injector size suggestions
hey guys, ive been plugging around on here and on a bronco site trying to find some info and it seems there are alot of different opinions on what is best. alot of what ive read was old so i thought id try to se what the current opinion is. alot of you have given me advice over the last year so you may remember me.
ive got a 393 that im STILL trying to get running. it has a lightning intake on it and im hoping for around 400 hp give or take. i recently figured out that at least the front two injectors arent opening. i dont think any of them are. ive used a noid light and they seem to be getting signal. using the 9 volt battery test i cant hear them clicking. the plugs were dry when i pulled them and there is no trace of a gas smell in the exhaust. the motor will try to start if i spray some starter fluid in it but nothing w/o it. im fairly certain its the injectors. the ones that are in it are the dark blue 36 pound fat injectors that i think came out of a tbird. i cant find anymore like that anyways.
so im trying to figure out what to go with. maybe upgrade if i need to. it seems they are all expensive. i hear people saying that if they are too big there will be idling problems. but i hear alot of good things about the siemmans deka 4 60 pound injectors . apparently the new technology has fixed the low end problems. some of people on the bronco site like them
so what do yall think? what is the popular opinion here? what works and what doesnt?
thanks a bunch!
kevin
ive got a 393 that im STILL trying to get running. it has a lightning intake on it and im hoping for around 400 hp give or take. i recently figured out that at least the front two injectors arent opening. i dont think any of them are. ive used a noid light and they seem to be getting signal. using the 9 volt battery test i cant hear them clicking. the plugs were dry when i pulled them and there is no trace of a gas smell in the exhaust. the motor will try to start if i spray some starter fluid in it but nothing w/o it. im fairly certain its the injectors. the ones that are in it are the dark blue 36 pound fat injectors that i think came out of a tbird. i cant find anymore like that anyways.
so im trying to figure out what to go with. maybe upgrade if i need to. it seems they are all expensive. i hear people saying that if they are too big there will be idling problems. but i hear alot of good things about the siemmans deka 4 60 pound injectors . apparently the new technology has fixed the low end problems. some of people on the bronco site like them
so what do yall think? what is the popular opinion here? what works and what doesnt?
thanks a bunch!
kevin
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Need a LOT more info on what you are working with, basically need all the dirt.
What vehicle is the motor in?
How is the motor equipped for ignition, EFI system?
What is the complete engine package?
What vehicle is the motor in?
How is the motor equipped for ignition, EFI system?
What is the complete engine package?
Thread Starter
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Tuned
Joined: Jul 2003
Posts: 359
Likes: 0
From: ga
Um. Im not sure what your asking. I know i will have to get some sort of tune . But that part is a little out of my wheelhouse.
Thread Starter
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Tuned
Joined: Jul 2003
Posts: 359
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From: ga
72 bronco
zf 5 spd trans
37 inch tires with 456 gears
Stroked 351w
pro comp aluminim heads
Lightning gt40 intake
Maf is off a cobra mustang i think
Throttle body is a holley. I cant findd a size on it anywhere
c3w1 ecu recently refirbed
New ron francis harness
Do you need more details?
Fleet Mechanic
Joined: Aug 2015
Posts: 1,838
Likes: 367
From: Candy Mountain
The mustang computer will not accommodate larger than stock injectors without tuning. No stock computer will.
Given the vehicle and goals i think a carburetor would have been simpler.
If you are set on on stock based efi get a computer from Stinger Performance.
Given the vehicle and goals i think a carburetor would have been simpler.
If you are set on on stock based efi get a computer from Stinger Performance.
Thread Starter
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Tuned
Joined: Jul 2003
Posts: 359
Likes: 0
From: ga
Believe me. If i had it to do over again it would be carburated. Ive spent thousands already on this crap its the only reason im trying to get it to work. I want to kick the teeth in of all the friends that talked me into this. Go efi they said. It will be so easy they said.
Anyways i was figuring i would have to get a tune i just havent made it that far yet
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FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Ok. Where to start
72 bronco
zf 5 spd trans
37 inch tires with 456 gears
Stroked 351w
pro comp aluminim heads
Lightning gt40 intake
Maf is off a cobra mustang i think
Throttle body is a holley. I cant findd a size on it anywhere
c3w1 ecu recently refirbed
New ron francis harness
72 bronco
zf 5 spd trans
37 inch tires with 456 gears
Stroked 351w
pro comp aluminim heads
Lightning gt40 intake
Maf is off a cobra mustang i think
Throttle body is a holley. I cant findd a size on it anywhere
c3w1 ecu recently refirbed
New ron francis harness
Woa... I wouldn't have guessed all that so thanks.
Is the Ron Francis harness designed for a Mustang computer?
Have you tried to pull codes? A new harness and computer should communicate perfectly so it's odd that you seem to think some of the injectors aren't firing. What distributor are you using? This motor should at least start and run unless you have a non OE style distributor in it.. you need one of those with the grey ignition module on the side of it.
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Thread Starter
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Tuned
Joined: Jul 2003
Posts: 359
Likes: 0
From: ga
Woa... I wouldn't have guessed all that so thanks.
Is the Ron Francis harness designed for a Mustang computer?
Have you tried to pull codes? A new harness and computer should communicate perfectly so it's odd that you seem to think some of the injectors aren't firing. What distributor are you using? This motor should at least start and run unless you have a non OE style distributor in it.. you need one of those with the grey ignition module on the side of it.
Is the Ron Francis harness designed for a Mustang computer?
Have you tried to pull codes? A new harness and computer should communicate perfectly so it's odd that you seem to think some of the injectors aren't firing. What distributor are you using? This motor should at least start and run unless you have a non OE style distributor in it.. you need one of those with the grey ignition module on the side of it.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
A 400hp naturally aspirated motor should have 30lb injectors but you can't just plug those in, the computer is programmed for 19lb and the Cobra meter was designed for use with 24lb injectors so there would be a bunch of mismatches going on. Any combination of parts can be made to work though, one trick used back in the day was to install a special MAF sensor tube designed for whatever size injectors you want to use, the biggest problem with that is the world has moved on so just finding one of those may be a challenge.
Logistics Pro
Joined: Aug 2014
Posts: 3,573
Likes: 855
The c3w1 is for an auto AOD.
What O2 harness are you using, is it pinned for the auto or manual?
Thread Starter
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Tuned
Joined: Jul 2003
Posts: 359
Likes: 0
From: ga
It's worth a shot. The current injectors could be the wrong type or they could be totally siezed. If you put a multimeter across the pins of an injector(harness disconnected) they should read about 14ohms, if it shows "OL" or a much higher number then the internal injector solenoid is blown open circuit. The old fat body EV1 injectors(if that is what you have) are almost nuke proof though so it's more likely they are just clogged up.
A 400hp naturally aspirated motor should have 30lb injectors but you can't just plug those in, the computer is programmed for 19lb and the Cobra meter was designed for use with 24lb injectors so there would be a bunch of mismatches going on. Any combination of parts can be made to work though, one trick used back in the day was to install a special MAF sensor tube designed for whatever size injectors you want to use, the biggest problem with that is the world has moved on so just finding one of those may be a challenge.
A 400hp naturally aspirated motor should have 30lb injectors but you can't just plug those in, the computer is programmed for 19lb and the Cobra meter was designed for use with 24lb injectors so there would be a bunch of mismatches going on. Any combination of parts can be made to work though, one trick used back in the day was to install a special MAF sensor tube designed for whatever size injectors you want to use, the biggest problem with that is the world has moved on so just finding one of those may be a challenge.
Thread Starter
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Tuned
Joined: Jul 2003
Posts: 359
Likes: 0
From: ga
It is pinned for the auto. Im not sure about the o2 harness but the ron francis harness used to be the ryans efi harness everyone was talking about. It is a mustang harness 93 thru 95. Without all the smog stuff. I thing stinger performance also sells it. I got mine from wild horses bronco.
Lead Driver
Joined: Sep 2003
Posts: 7,018
Likes: 210
From: SoCal
Get a can of jet spray Gumout with a straw. stick the straw into the inlet of the injector, apply 12 volts to it, and spray the Gumout. See if any of it dribbles out of the pintle. Is so, it's working.
If not, the Gumout will help dissolve deposits that might have clogged the injector. I've unstuck injectors this way before.
I've also had injectors that made no noise when opening.
If not, the Gumout will help dissolve deposits that might have clogged the injector. I've unstuck injectors this way before.
I've also had injectors that made no noise when opening.
Thread Starter
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Tuned
Joined: Jul 2003
Posts: 359
Likes: 0
From: ga
Get a can of jet spray Gumout with a straw. stick the straw into the inlet of the injector, apply 12 volts to it, and spray the Gumout. See if any of it dribbles out of the pintle. Is so, it's working.
If not, the Gumout will help dissolve deposits that might have clogged the injector. I've unstuck injectors this way before.
I've also had injectors that made no noise when opening.
If not, the Gumout will help dissolve deposits that might have clogged the injector. I've unstuck injectors this way before.
I've also had injectors that made no noise when opening.
Well ill try that and see. All the spark plugs are dry so i really dont think anything was passing but what your saying is easy enough to try. Do you think sea foam or some other brand would work as well?