injector size?

[montess408]

i am in the midle of building a 3.1/3400 hybrid its a mild build and i was wondering on what size of injectors to get i was looking at the accel 17pounds or 19 pounds i am also running a 75 shot soi dont wanna go lean so thats why i was looking at the injectors so what do you guys think ?

[sharkey]

19lb injectors will support roughly 190hp. are you running a wet kit or a dry shot??? if your running a dry shot id go with at least 24lb injectors, may even want to find some 28-30lb.

[Superdave]

#24's should be more than enough...

[montess408]

if i go with bigger injectors will my stock ecu run them ?
and i should go with 24 lbs whoa that big !

[Superdave]

It'll run them just fine but you'll need to spend time tuning anyways... the 3400 top end throws the VE all out of wack.

[montess408]

hey dave do you know if a 3800 injector would work for me cause i can get them everywhere around here or maybe even a 3300 i got 3 of them junked in the back what do they flow for numbers ?

[jackal2000]

im pretty sure the 3800 has 36lb injectors? maybe im thinking of the 3800s/c.

[Guest]

19lb injectors will support roughly 190hp. are you running a wet kit or a dry shot??? if your running a dry shot id go with at least 24lb injectors, may even want to find some 28-30lb.

I had my 19s support about 250HP.

[Superdave]

I had my 19s support about 250HP.

Moonwell is running the stock 3400 injectors and pushing about 250-260, i thought they were #19's but apparently they're #22's

the L67 has #36 injectors, the N/A version would probably have #24 or so.. i have a set from a '88 park ave but they had 200K on them so i didn't even want to try running them, lol.


3.4 DOHC injectors are #24, that's what i have in my 3500 right now. I haven't ran them yet but the math says they're a little too small.

[Guest]

Moonwell is running the stock 3400 injectors and pushing about 250-260, i thought they were #19's but apparently they're #22's

the L67 has #36 injectors, the N/A version would probably have #24 or so.. i have a set from a '88 park ave but they had 200K on them so i didn't even want to try running them, lol.


3.4 DOHC injectors are #24, that's what i have in my 3500 right now. I haven't ran them yet but the math says they're a little too small.

IIRC 3800 NA was only 17 or 19 lbs. A lot smaller than I would have thought.

I KNOW mine were 19#/hr, they were Orange top Ford injectors.

I now have some Red Top Injectors 34 #/hr IIRC, oh she is going to be PIG rich when I first fire that shit up.

Also I have dyno proof of what my engine made with the 19# injectors. 218 @ the wheels, whihc is about 250 at the crank.

[treeZ24]

chris the only problem with that is your duty cycle was probaby at 110% or something stupid. also the old ball type injectors are less suseptible to locking static then the multec 2 injectors. atleast in my experience. imagine how much nicer its going to be with the new ones lol

i would agree with the 22# or 24# injectors UNLESS you never run the engine hard then you can get away with 19# injectors. although your duty cycle will probably be higher then 80% if its only for a second and not prolonged you'd probably get away with the injectors not going static.

[sharkey]

I had my 19s support about 250HP.

if you run a rising rate fmu i could see that. however the most your injectors should see is 80% d/c. and if we are talking multec 2 injectors, its again a different storry because they open and close much quicker. ive heard a 19lb multec 2 can flow as much as 40% more than a regular 19lb bosch

[Guest]

if you run a rising rate fmu i could see that. however the most your injectors should see is 80% d/c. and if we are talking multec 2 injectors, its again a different storry because they open and close much quicker. ive heard a 19lb multec 2 can flow as much as 40% more than a regular 19lb bosch

No RRFMU, just a modified stock FPR, which IIRC, was set to maybe a PSI or two higher than stock. Again, dyno proven to support that much, yes it was starting to get lean, but it did it.

I've also ALWAYS found those injector calculator to run a bit on the fat side of things, for a safety margin.

[treeZ24]

if you run a rising rate fmu i could see that. however the most your injectors should see is 80% d/c. and if we are talking multec 2 injectors, its again a different storry because they open and close much quicker. ive heard a 19lb multec 2 can flow as much as 40% more than a regular 19lb bosch

hmm,, one of us is confused because a 19# injector should be a 19# injector. i think the additional flow rates were at lower duty cycles becuase they could open that much faster but when they are at their max rated flow...... they should still be a 19#

i've still yet to see any real flow data on any injectors, i should go talk with the guys at b&d maybe they can set something up for us.

[sharkey]

basicly what it comes down to is when your buying injectors, why get ones that just barley meet your needs??? its better to side with the calculators and get injectors that are a tad bit big for your application. i know id much rather have more than enough fuel than the motor leaning out and melting a piston cause the injectors are too small.