Honda Civic Performance - JDM Discussion Engine tech, forced induction, springs, shocks, brakes, tires, etc.

Injectors

Old 08-Aug-2006, 09:55 AM
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Injectors

- How much CC are stock injectors?
- How big of injectors should i go on a b20 vtec? all motor.
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Old 08-Aug-2006, 10:14 AM
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B series stock is 240.. alot of people go 310.. or even 440.. depends what your needs are
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Old 08-Aug-2006, 10:18 AM
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Old 08-Aug-2006, 10:52 AM
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say if im just over 200whp what would you suggest, if you have to much CC flowing is it bad?
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Old 08-Aug-2006, 11:27 AM
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I think 440's would be fine.. you don't want to max out the injectors but at the same time you don't want to flow too much.. maybe even like 370's..
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Old 08-Aug-2006, 11:31 AM
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240cc = 180-190whp
310cc = 200-220whp
370cc = 220-280whp
440cc = 280-330whp
550cc = 330-380whp
660cc = 380-425whp
720cc = 425-475whp
880cc = 475-525whp
1000cc = 525-600whp.
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Old 08-Aug-2006, 11:32 AM
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Originally posted by weiRtech
Click for Injector Info
good link aaron
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Old 08-Aug-2006, 11:34 AM
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Originally posted by RDub99
I think 440's would be fine.. you don't want to max out the injectors but at the same time you don't want to flow too much.. maybe even like 370's..

440's would be too big....he would need to either keep his stock 240's or go step up and get 310's

440's are generally used when you go with a turbo setup, no all the times but I have a few friends running RC 440's that put down 270+
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Old 08-Aug-2006, 11:46 AM
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Originally posted by plzbeleiveit
say if im just over 200whp what would you suggest, if you have to much CC flowing is it bad?
it isn't bad to have a larger injector size than is required, but it may be more difficult to tune a smooth idle i'd think.

set yourself a hp goal and build your engine with that target in mind. too many people just throw a bunch of parts together without giving it much thought and then wonder why they aren't getting the performance they paid for. all the parts need to work together to get the full potential out of them.
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Old 08-Aug-2006, 11:53 AM
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Originally posted by mugen_r



440's would be too big....he would need to either keep his stock 240's or go step up and get 310's

440's are generally used when you go with a turbo setup, no all the times but I have a few friends running RC 440's that put down 270+
yup
sounds good.. I found that whp list on honda-tech afterwards..
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Old 08-Aug-2006, 07:21 PM
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if yoru around 200 whp 310 cc shoudl be fine

but you might max them out at stock fuel pressure if you push to much power
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Old 08-Aug-2006, 10:15 PM
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the way i see it, if you're going to spend the money on injectors, you might as well leave room for improvements. Meaning buy a bigger injector than you need for the moment. Tuning 440's isn't hard and aren't too big for n/a, but would still leave plenty of room if you up the compression/get bigger cams or headwork, spray or boost in the future. Instead of having to buy bigger injectors...again.
Just make sure to get Peak and Hold (low impedence) if you're car needs them or Saturated (high impedence) if thats what it takes. Instead of using p-n-h injectors in a car that needs saturated and having to wire up a resistor box. Doing so is very simple and doesn't take very long, but if you're gunna spend the money get ones that are plug and play (so to speak).
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Old 09-Aug-2006, 06:43 AM
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Well my head is pretty much builts with skunk 2 internals, block is stock except for the pistons being notched. so 440's the way to go.
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Old 11-Aug-2006, 04:52 PM
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you can lose good power using to big of an injector, you shouldnt need more than 345s really.. the prelude oem ones are to find
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Old 11-Aug-2006, 06:09 PM
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thats not true. If you tune and scale down the fuel maps for the larger injectors then it will run exactly the same as smaller injectors and will leave room for more power. But if all you do is toss in some big injectors and expect it to run good, then you're in for a big surprise. It will run super rich and make less power.
I've tuned n/a cars with 440cc injectors with no problems, in fact, i'm planning on buying some 440s for my car asap, i've maxed my 240s out already.
Its all in the tuning. You're idle won't suffer either.
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Old 11-Aug-2006, 06:50 PM
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i got some 440's sitting in my trunk zeepos.

The injector tick will drive you crazy though lol
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Old 11-Aug-2006, 07:09 PM
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i want saturated, not peak and hold and i'm looking for new injectors, so i know they all flow the same amount, you're taking a chance with used injectors. One or two might not flow as much as the others, and unless they've been sonically cleaned and flow tested/matched then its pretty much a gamble. And for what you would pay for cleaning/flow testing you could pretty much buy brand new injectors.
But thanks for the offer karl.
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Old 11-Aug-2006, 07:46 PM
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lenny.. they have been cleaned and flow tested you homo. And I got the resistor pack to go with it.

10 mcChickens and its all yours!
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Old 13-Aug-2006, 11:17 AM
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i am going to be running dsm 440cc for 7psi on my turbo set-up for my b18c1... should be fine... just need to pick them up...
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Old 13-Aug-2006, 12:26 PM
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hey, can anything bad come out of having injectors that are bigger than u need? like i'm boosting and guesin that whp would be 200 or under, not lookin for any crazy power(at the moment), so if i had 440CC DSM injectors, would this make any difference from having 310 or 370?
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