# Injectors
**URL:** https://forums.speedlife.net/t/injectors/181060
**Category:** PittSpeed Automotive
**Created:** [March 18, 2006, 2:01pm UTC](https://forums.speedlife.net/t/injectors/181060 "2006-03-18T14:01:14Z")
**Posts on this page:** 16
**Page:** 1
### Author:  [@wrayzor](https://forums.speedlife.net/u/wrayzor)
#### Post date: [March 18, 2006, 2:01pm UTC](https://forums.speedlife.net/t/injectors/181060/1 "2006-03-18T14:01:14Z")
Got a buddy that has 460cc injectors from an rx7 fc and is wanting to sell them for $75…im running a ls/vtec at 7 psi will these work for me? worth the buy?
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### Author:  [@FourGee6Tee3](https://forums.speedlife.net/u/FourGee6Tee3)
#### Post date: [March 18, 2006, 2:09pm UTC](https://forums.speedlife.net/t/injectors/181060/2 "2006-03-18T14:09:32Z")
Pretty much, are those injectors side or top fed?
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### Author:  [@wrayzor](https://forums.speedlife.net/u/wrayzor)
#### Post date: [March 18, 2006, 2:31pm UTC](https://forums.speedlife.net/t/injectors/181060/3 "2006-03-18T14:31:44Z")
they are top feed red tops
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### Author:  [@grandamld9](https://forums.speedlife.net/u/grandamld9)
#### Post date: [March 18, 2006, 9:09pm UTC](https://forums.speedlife.net/t/injectors/181060/4 "2006-03-18T21:09:30Z")
IFR = (HP \* BSFC) / (# of Injectors \* .8)
So, my 225 BHP car, with a BSFC of .65, I will use this formula:
IFR = (225 \* .65) / (4 \* .8)
IFR = 46 lb/hr, multiply that by 10.55 to get CC’s, 485cc
F2 = (P2 \* F1) / P1
F2 = Flow (in lbs/hr) at the new PSI
P2 = Desired fuel pressure
F1 = Fuel injector flow at the rated PSI (P1)
P1 = Rated fuel injector PSI
In our example:
F2 = (60 \* 36) / 45
F2 = 48 lbs/hr
And are these Ford red tops? If they are, i thought they were 320cc/30lbs (at whatever ford rates there injectors at)
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### Author:  [@wrayzor](https://forums.speedlife.net/u/wrayzor)
#### Post date: [March 21, 2006, 9:27am UTC](https://forums.speedlife.net/t/injectors/181060/5 "2006-03-21T09:27:42Z")
Im not exactly sure Im just goin from what this guy is telling me they are…he had them in an old Fc, not sure
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### Author:  [@wrayzor](https://forums.speedlife.net/u/wrayzor)
#### Post date: [March 21, 2006, 9:37am UTC](https://forums.speedlife.net/t/injectors/181060/6 "2006-03-21T09:37:35Z")
I have an ls bottom end (doing rods and pistons) with B16 head (stock for now) a T3 running 7 psi, only expecting to hit 230 hp at the most, what kinda injectors am I gonna need while on a budget?
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### Author:  [@grandamld9](https://forums.speedlife.net/u/grandamld9)
#### Post date: [March 21, 2006, 12:54pm UTC](https://forums.speedlife.net/t/injectors/181060/7 "2006-03-21T12:54:55Z")
> [@wrayzor](#):
>
> I have an ls bottom end (doing rods and pistons) with B16 head (stock for now) a T3 running 7 psi, only expecting to hit 230 hp at the most, what kinda injectors am I gonna need while on a budget?
use the formulas i posted.
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### Author:  [@SlowCivic](https://forums.speedlife.net/u/SlowCivic)
#### Post date: [March 21, 2006, 2:45pm UTC](https://forums.speedlife.net/t/injectors/181060/8 "2006-03-21T14:45:25Z")
> [@wrayzor](#):
>
> I have an ls bottom end (doing rods and pistons) with B16 head (stock for now) a T3 running 7 psi, only expecting to hit 230 hp at the most, what kinda injectors am I gonna need while on a budget?
Yeah they will work fine man … i made 300whp on my b20 motor with dsm 450’s so your mid 200 goal is very safe if tuned right.
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### Author:  [@FourGee6Tee3](https://forums.speedlife.net/u/FourGee6Tee3)
#### Post date: [March 21, 2006, 2:48pm UTC](https://forums.speedlife.net/t/injectors/181060/9 "2006-03-21T14:48:45Z")
Yeah about a T3 runnin 7 pounds…[http://home.comcast.net/~tarryo/kyle/articles/compefficiency.html](http://home.comcast.net/~tarryo/kyle/articles/compefficiency.html)
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### Author:  [@wrayzor](https://forums.speedlife.net/u/wrayzor)
#### Post date: [March 21, 2006, 3:50pm UTC](https://forums.speedlife.net/t/injectors/181060/10 "2006-03-21T15:50:44Z")
i dont understand how to make it work, im not that car smart still learnin
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### Author:  [@wrayzor](https://forums.speedlife.net/u/wrayzor)
#### Post date: [March 21, 2006, 3:56pm UTC](https://forums.speedlife.net/t/injectors/181060/11 "2006-03-21T15:56:07Z")
FourGee thnx for the article
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### Author:  [@fmfkid250](https://forums.speedlife.net/u/fmfkid250)
#### Post date: [March 21, 2006, 4:17pm UTC](https://forums.speedlife.net/t/injectors/181060/12 "2006-03-21T16:17:03Z")
there is no way i am going to let you keep that thing @ 7 psi if u have forged pistons/rods!!!
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### Author:  [@wrayzor](https://forums.speedlife.net/u/wrayzor)
#### Post date: [March 21, 2006, 5:38pm UTC](https://forums.speedlife.net/t/injectors/181060/13 "2006-03-21T17:38:41Z")
haha remember i have to drive it everyday for the next year until i can afford a beater
unless i get lucky and my dad lets me buy/have this '90 mx 6 he just picked up
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### Author:  [@fmfkid250](https://forums.speedlife.net/u/fmfkid250)
#### Post date: [March 21, 2006, 5:48pm UTC](https://forums.speedlife.net/t/injectors/181060/14 "2006-03-21T17:48:10Z")
with forged pistons/rods that thing will be relable up to 14psi daily driven
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### Author:  [@wrayzor](https://forums.speedlife.net/u/wrayzor)
#### Post date: [March 21, 2006, 5:51pm UTC](https://forums.speedlife.net/t/injectors/181060/15 "2006-03-21T17:51:33Z")
Well im def gonna have to get new pistons and rods anyways doin the ls/vtec so we’ll have somethin to work with…hey I have GSR axles rite now those gonna be good to go for now?
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### Author:  [@FourGee6Tee3](https://forums.speedlife.net/u/FourGee6Tee3)
#### Post date: [March 22, 2006, 6:15pm UTC](https://forums.speedlife.net/t/injectors/181060/16 "2006-03-22T18:15:08Z")
> [@wrayzor](#):
>
> FourGee thnx for the article
Anytime Spread the word.