408 Guys what size injector?

[NewToFord]

the motor is gonna make 500-550 n/a. I thought a 38lbs would work, but woody told me go bigger. What should I use? Also I was gonna run a 90 mm throttle body, and maf. Does this setup sound good? thanks

 

[TOOLOW91]

Dude woody is a pretty known engine builder and he knows his stuff id trust what hes telling you....

 

[hoopty5.0]

putting 42s in mine as soon as I find some under $200. Sheesh you'd think they were made of gold...

The 90mm setup will work. Wouldn't go anything smaller than 80mm. There is a guy by me with 75mm MAF and T/B on his 408. HP and TQ take a nose dive @ 5900 rpm when it runs out of air.

 

[LarsD]

I'd go with 42lber's if it were mine.

 

[NIKwoaC]

Dude woody is a pretty known engine builder and he knows his stuff id trust what hes telling you....

+1, I'd go with whatever Woody is telling you to go with. Also, google "fuel injector calculator", there are a ton of them out there.

As far as the TB, it is actually hard to go too big for parts on a 408. I would consider nothing less than a 90 for a 408. What is the rest of the setup?

 

[hoopty5.0]

Also google 408w and read. You'll notice a trend: 42lb injectors, 90mm tb, usually some variant of a Vic Jr/Sr, and at the least a single 255 lph pump

 

[srtthis]

putting 42s in mine as soon as I find some under $200. Sheesh you'd think they were made of gold...

The 90mm setup will work. Wouldn't go anything smaller than 80mm. There is a guy by me with 75mm MAF and T/B on his 408. HP and TQ take a nose dive @ 5900 rpm when it runs out of air.

www.lightningrodder.com im sure you can find them in the classifieds

 

[hoopty5.0]

sweet, thanks. Might be a month or so. I blew my wad on valve covers and a big 'ol throttle body today.

 

[srtthis]

sweet, thanks. Might be a month or so. I blew my wad on valve covers and a big 'ol throttle body today.

if they give you about being a newb and trying to buy parts just tell them derek@amazon sent you over.

 

[hoopty5.0]

if they give you **** about being a newb and trying to buy parts just tell them derek@amazon sent you over.

hahahah ok. Do they tend to be cheaper over there since 42s are OEM on the lightnings? All the ones I see on Corral are grubby used ones with no proof of quality or miles and they still want well over $200. Every now and then you see them show up for $180 or so, but are usually snatched up instantly

 

[VibrantRedGT]

Posted in the 94-95 Sticky. The 42lb injectors are good up to around 685HP Flywheel.

5. MAF AIR FLOW DATA (In CFM):

1.Stock 5.0L 58MM (89-93 Mustangs), 606 CFM
2.Stock 5.0L 70MM (94-95 GT/Cobra Mustangs), 815 CFM
3.Pro-M Bullet (75MM), 964 CFM
4.Ford 80MM (Lightnings), 1017 CFM
5.C&L 73MM, 1171 CFM
6.Modified 80MM (Flow Bar Removed), 1368 CFM
7.C&L 80MM, 1415 CFM
8.Pro-M 77MM (Shorty/Supercharged Version), 1543 CFM
9.Pro-M 77MM (Standard Version), 1562 CFM
10.Pro-M 83MM, 1598 CFM
11.Pro-M 80MM, 1612 CFM

ABACO SERIES- Tested 20.4" With 10" Air
12. DBX-85, 1052 CFM
13. DBX-97, 1252 CFM
14. DBX-97b, 1323 CFM​

​

6. THROTTLE BODY AIR FLOW DATA (In CFM):​

​

1.Ford Stock 5.0L 60MM, 526 CFM​

2.Accufab 65MM, 616 CFM​

3.BBK 70MM, 726 CFM​

4.Accufab 75MM, 845 CFM​

5.Accufab 90MM, 1225 CFM​

​

​

FRPP FUEL INJECTOR RATE by LBS. / HP RATING & COLOR​

​

Injector Lb/Hr Max V8 HP HP supported by 1 injector Ford Color*​

14 Lb/Hr 228 28.56 Gray​

19 Lb/Hr 310 38.76 Orange​

24 Lb/Hr 391 48.96 Lt Blue​

30 Lb/Hr 490 61.19 Red​

36 Lb/Hr 587 73.44 Dk Blue​

42 Lb/Hr 685 85.68 Lt Green​

60 Lb/Hr 800 100​

*Colors are only constant for Ford Racing Performance Parts brand name injectors.​

 

[srtthis]

hahahah ok. Do they tend to be cheaper over there since 42s are OEM on the lightnings? All the ones I see on Corral are grubby used ones with no proof of quality or miles and they still want well over $200. Every now and then you see them show up for $180 or so, but are usually snatched up instantly

yup... you can find them for about 100-150 most of the times

 

[hoopty5.0]

yup... you can find them for about 100-150 most of the times

You just made my day

 

[Rick 91GT]

Is this a street car? What tuner will you be using?

Either injector will work, truly a 36lb could work and be a little less hassle in a street car, less to trim out down low where you'll spend most of your time. IF you need a little up top you can increase pressure, still better then having a overly large injector to deal with.

90mmTB, and 92mm Pro-M meter get my vote.

srtthis - Whats your thoughts on the issues with large injectors in a street car, this is something I think about more often now days....tuning out large injectors can be a PIA.

hoopty, having the 75mm tb shouldnt be an issue with the 408, his big issue is the 75mm MAF.

 

[srtthis]

Rick@amazon did all the tuning and never seemed to have any issues doing it.

but i def see where your coming from.

 

[Rick 91GT]

I find 60+ to a PIA down low

 

[srtthis]

really? i know 60's are better then 50's or 55's. i have heard issues from some tuners on the 83's though

 

[Rick 91GT]

more so on turbo cars, damn things are finiky down low

 

[srtthis]

actually i may have a answer for you on why...

does it do it on ALL the 60's you use or just some?

 

[NewToFord]

Hey Guys. I ordered the 42's. Here is the rest of my set up. 255 pump, stock lines, professional products fuel rails, adjustable regulator, 90 mm tb, 97 mm dbx maf, power pipe. I am gonna have an sct chip burned by my local tuner. What do you guys think?