what injectors should i go with for my 331???

[juiced_94gt]

Well two of my 24lb injectors took a dump i tested the harness and its two bad injectors causing a huge misfire well it's a 331 with AFR 185's a track heat manifold, TFS stage 2 cam, 80mm LMAF and will eventually get a at least a 75 shot of spray...it's my daily driver so do bigger injectors equal more gas?? should i stick with 24's for a 75 shot?? are 30' or 36's a better choice?? I will go to steve at powertrin on monday to get my chip re-flashed for whatever i need.

 

[sage2k]

30's or 36's
I have a 302 with trickflow kit and its maxing out my 24's

 

[Grn92LX]

Wet or dry kit?

I would do 30's if its a wet kit and 36's if its a dry kit. My 30's are near maxxed out.

 

[DDSTANG94]

Well two of my 24lb injectors took a dump i tested the harness and its two bad injectors causing a huge misfire well it's a 331 with AFR 185's a track heat manifold, TFS stage 2 cam, 80mm LMAF and will eventually get a at least a 75 shot of spray...it's my daily driver so do bigger injectors equal more gas?? should i stick with 24's for a 75 shot?? are 30' or 36's a better choice?? I will go to steve at powertrin on monday to get my chip re-flashed for whatever i need.

i dont think 24ers were adequate for what ur running now..and if u throw nitrous in the mix its going to be problems..i would say 36#ers..

 

[Stanger007]

If you're getting the chip flashed, go big.

Wes

 

[5spd GT]

I would do 30's if its a wet kit and 36's if its a dry kit.

I have to agree here.

Get a tune either way...

 

[BlackVert]

+1 on the 36s

 

[gcomfx.com]

If you are getting a tune.... and you have the LMAF. Why not go with 42s and be done with it? That's what I'm running. Don has been able to tune it first a little lean, then a little rich. Next tune should be on the money. And I'm ready for a super charger down the road. All I have to do it slap it on the car. T/B, Mass Air, injectors... it's all ready to go.

 

[juiced_94gt]

If you are getting a tune.... and you have the LMAF. Why not go with 42s and be done with it? That's what I'm running. Don has been able to tune it first a little lean, then a little rich. Next tune should be on the money. And I'm ready for a super charger down the road. All I have to do it slap it on the car. T/B, Mass Air, injectors... it's all ready to go.

Supercharger with flat top pistons???

 

[gcomfx.com]

Super charger with a stock engine? Nitrous on stock hypertectic pistons?

I'm not talking about 30 psi or anything.

 

[blkcobra50]

36# or 42#

I have 42's on my 331. AFR is where it should be w/proper tune of course.

 

[final5-0]

I do wanna say I think John could not find 36's a while back
for his 347 combo

Grady

 

[DDSTANG94]

right HERE>>>>http://cgi.ebay.com/ebaymotors/8-36...012QQitemZ220138059488QQrdZ1QQsspagenameZWDVW

 

[5spd GT]

I know Accel makes 36lbers, but I like the Ford Racing ones myself...(bias)...

So in that case, get 42lber's with a tune

Fuel Injector Selection:

Injector HP Ratings: divide flow rating by .5 and multiply the result by the number of injectors. The following examples use a 100% duty cycle. These ratings are for N/A engines and at the flywheel.

Example:

19 lb injectors/.5 = 38 - 38 x 8 = 304 HP
24 lb injectors/.5 = 48 - 48 x 8 = 384 HP
30 lb injectors/.5 = 60 - 60 x 8 = 480 HP
36 lb injectors/.5 = 72 - 72 x 8 = 576 HP
42 lb injectors/.5 = 84 - 84 x 8 = 672 HP

The preferred duty cycle is about 85% maximum, so for a safety factor multiply the final figure times .85.

304 HP x .85 = 258 HP for 19lb injectors
385 HP x .85 = 326 HP for 24lb injectors
480 HP x .85 = 408 HP for 30lb injectors
576 HP x .85 = 490 HP for 36lb injectors
672 HP x .85 = 571 HP for 42lb injectors

Remember that the above ratings are at 39 PSI. Increasing the pressure will effectively increase the flow rating. Example: a 19 lb injector will flow 24 lbs at 63 PSI, and a 24 lb injector will flow 30 lbs at 63 PSI.

See http://users.erols.com/srweiss/ to get the calculators used in these examples.

Courtesy of jrichker...

 

[Guero]

If your going with 30lbers im selling mine....

 

[The Green GT]

42's with a tune. It will give plenty of room to grow.

 

[final5-0]

I also prefer FMS/Bosch

All inj's are not created equal :Word:

Another thing about that excellent info David gave us

Those HP ratings are Flywheel ... NOT ... RWHP

Grady

 

[5spd GT]

Good point, I always forget to add that 'note'...because that changes things a bit

Edited...

 

[final5-0]

Several times I've been contacted with a request of why I feel 19's will not
feed all that much power.

The most important thing to keep in mind I tune at stock pressure so that
is my point of reference.

Peeps are so quick to say ... "19's will feed 300 horses"

Look at that info David provided

304 flywheel hp

258 with the 85% duty cycle

258 x .85 for a 15% drive line loss = 219 rwhp

See why Ford put 24's on the Cobras

Grady

 

[5spd GT]

I see, I see