# injector size. **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [May 6, 2008, 8:33pm UTC](https://forums.speedlife.net/t/injector-size/48019 "2008-05-06T20:33:54Z")\ **Posts on this page:** 16\ **Page:** 1
**Author:** ![lsvtechatch](https://avatars.discourse-cdn.com/v4/letter/l/e5b9ba/32.png) [@lsvtechatch](https://forums.speedlife.net/u/lsvtechatch)\ **Post date:** [May 6, 2008, 8:33pm UTC](https://forums.speedlife.net/t/injector-size/48019/1 "2008-05-06T20:33:54Z")
I’m looking for some kind of calculator or formula to figure out what size injector i should be using. I looked in the Sticky under TECH, but couldnt find anything, maybe i didn’t look hard enough. Can anyone point me in the right direction? ---
**Author:** ![91CRXSI](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/91crxsi/32/7247_2.png) [@91CRXSI](https://forums.speedlife.net/u/91CRXSI)\ **Post date:** [May 6, 2008, 8:35pm UTC](https://forums.speedlife.net/t/injector-size/48019/2 "2008-05-06T20:35:30Z")
im pretty sure the precision website has a calculator. what are you looking to do maybe we can suggest someting ---
**Author:** ![Carnut](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/carnut/32/7590_2.png) [@Carnut](https://forums.speedlife.net/u/Carnut)\ **Post date:** [May 6, 2008, 8:35pm UTC](https://forums.speedlife.net/t/injector-size/48019/3 "2008-05-06T20:35:45Z")
[www.raceeng.com](http://www.raceeng.com) ---
**Author:** ![lsvtechatch](https://avatars.discourse-cdn.com/v4/letter/l/e5b9ba/32.png) [@lsvtechatch](https://forums.speedlife.net/u/lsvtechatch)\ **Post date:** [May 7, 2008, 6:23am UTC](https://forums.speedlife.net/t/injector-size/48019/4 "2008-05-07T06:23:05Z")
all motor ls/vtec running around 210-220hp. thanks for the help, ill try those. ---
**Author:** ![Adictd2b00st](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/adictd2b00st/32/7625_2.png) [@Adictd2b00st](https://forums.speedlife.net/u/Adictd2b00st)\ **Post date:** [May 7, 2008, 6:41am UTC](https://forums.speedlife.net/t/injector-size/48019/5 "2008-05-07T06:41:55Z")
[http://www.deatschwerks.com/catalog/fuel\_calculators.php](http://www.deatschwerks.com/catalog/fuel_calculators.php) ---
**Author:** ![MrSmith](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mrsmith/32/5254_2.png) [@MrSmith](https://forums.speedlife.net/u/MrSmith)\ **Post date:** [May 7, 2008, 10:34am UTC](https://forums.speedlife.net/t/injector-size/48019/6 "2008-05-07T10:34:38Z")
220 whp? I would go with 370s this way you still have some room if you decide you want more power. ---
**Author:** ![Nikuk](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nikuk/32/7254_2.png) [@Nikuk](https://forums.speedlife.net/u/Nikuk)\ **Post date:** [May 7, 2008, 10:37am UTC](https://forums.speedlife.net/t/injector-size/48019/7 "2008-05-07T10:37:55Z")
[http://www.rceng.com/technical.aspx](http://www.rceng.com/technical.aspx) ---
**Author:** ![99\_civic\_si](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/99_civic_si/32/7319_2.png) [@99\_civic\_si](https://forums.speedlife.net/u/99_civic_si)\ **Post date:** [May 7, 2008, 11:07am UTC](https://forums.speedlife.net/t/injector-size/48019/8 "2008-05-07T11:07:52Z")
I’d go with 440s personally. They are still small enough to make for an easy tune for idle, you will then have a decent amount of room to upgrade/change build. Also, you will have an easier time reselling if you ever decide you want to get rid of them. ---
**Author:** ![lsvtechatch](https://avatars.discourse-cdn.com/v4/letter/l/e5b9ba/32.png) [@lsvtechatch](https://forums.speedlife.net/u/lsvtechatch)\ **Post date:** [May 7, 2008, 11:33am UTC](https://forums.speedlife.net/t/injector-size/48019/9 "2008-05-07T11:33:11Z")
> [@Nikuk](#): > > [RC Fuel Injection \> Technical](http://www.rceng.com/technical.aspx) exactly what i was looking for. thanks! ---
**Author:** ![Nikuk](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nikuk/32/7254_2.png) [@Nikuk](https://forums.speedlife.net/u/Nikuk)\ **Post date:** [May 7, 2008, 11:35am UTC](https://forums.speedlife.net/t/injector-size/48019/10 "2008-05-07T11:35:05Z")
try to find the bsfc for your engine. ---
**Author:** ![lsvtechatch](https://avatars.discourse-cdn.com/v4/letter/l/e5b9ba/32.png) [@lsvtechatch](https://forums.speedlife.net/u/lsvtechatch)\ **Post date:** [May 7, 2008, 11:37am UTC](https://forums.speedlife.net/t/injector-size/48019/11 "2008-05-07T11:37:21Z")
> [@Nikuk](#): > > try to find the bsfc for your engine. and how would i do such a thing? ---
**Author:** ![Nikuk](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nikuk/32/7254_2.png) [@Nikuk](https://forums.speedlife.net/u/Nikuk)\ **Post date:** [May 7, 2008, 11:39am UTC](https://forums.speedlife.net/t/injector-size/48019/12 "2008-05-07T11:39:20Z")
I’d guess google, or hondatech. ---
**Author:** ![lsvtechatch](https://avatars.discourse-cdn.com/v4/letter/l/e5b9ba/32.png) [@lsvtechatch](https://forums.speedlife.net/u/lsvtechatch)\ **Post date:** [May 7, 2008, 11:48am UTC](https://forums.speedlife.net/t/injector-size/48019/13 "2008-05-07T11:48:49Z")
wow, the b.s.f.c. actually makes a fairly significant difference. a 40c.c. difference from .45 to .50. ---
**Author:** ![Nikuk](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nikuk/32/7254_2.png) [@Nikuk](https://forums.speedlife.net/u/Nikuk)\ **Post date:** [May 7, 2008, 11:49am UTC](https://forums.speedlife.net/t/injector-size/48019/14 "2008-05-07T11:49:52Z")
Which is why I said that… don’t just assume the numbers. I’m guessing you’re working on a honda? If so… I’m sure its covered somewhere. ---
**Author:** ![lsvtechatch](https://avatars.discourse-cdn.com/v4/letter/l/e5b9ba/32.png) [@lsvtechatch](https://forums.speedlife.net/u/lsvtechatch)\ **Post date:** [May 7, 2008, 11:54am UTC](https://forums.speedlife.net/t/injector-size/48019/15 "2008-05-07T11:54:51Z")
> [@Nikuk](#): > > Which is why I said that… don’t just assume the numbers. > > I’m guessing you’re working on a honda? If so… I’m sure its covered somewhere. yea im in the process of doing all the formulas and conversions. and i didnt see anything on google. im guessing because its not a factory honda motor…its an ls/vtec. ---
**Author:** ![harvboi05](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/harvboi05/32/5124_2.png) [@harvboi05](https://forums.speedlife.net/u/harvboi05)\ **Post date:** [May 7, 2008, 8:16pm UTC](https://forums.speedlife.net/t/injector-size/48019/16 "2008-05-07T20:16:46Z")
dsm 450s are only 50 bucks…