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What size injector do I need for a 383?

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Old 11-20-2006, 04:32 PM   #1
Archaea
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Default What size injector do I need for a 383?

I'm having a 383 L98 built. It will use the superram intake.

What size injector do I need to purchase?

What brand? How much should I look to spend?

I asked the guys at pcm for less how many lb injectors they recommeded and they said 24lb should be fine.

Is that in agreement here?

Any particular brand? What's the problem with going with too large of an injector - example--- 30lb?
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Old 11-20-2006, 04:38 PM   #2
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what about these injectors?

looks like ~$230 for a set of 8.

Do I need high impedance or low impedance with the L98?


http://www.jegs.com/webapp/wcs/store...10002_55253_-1

Last edited by Archaea; 11-20-2006 at 07:12 PM.
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Old 11-20-2006, 04:47 PM   #3
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What heads? cam? exhaust combo? compression ratio?
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Old 11-20-2006, 04:50 PM   #4
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Quote:
Originally Posted by TM-96CE
What heads? cam? exhaust combo? compression ratio?
ported 113 heads,
compression ratio = 10.1
cam = 224,232 @50-- 114 LSA,
(1.6 rockers as well)
Hedman elite headers,
no cats,
true dual exhaust,
Borla xr-1 mufflers.


link to build here.

http://forums.corvetteforum.com/show....php?t=1539561

Last edited by Archaea; 11-21-2006 at 08:55 AM.
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Old 11-20-2006, 05:01 PM   #5
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I would look into the SVO 30# injectors.
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Old 11-20-2006, 05:26 PM   #6
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Consult with the tuner before purchasing the injectors. You will likely get split opinions to the 24 vs the 30's. I am running 24's on a similar combo.
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Old 11-20-2006, 05:29 PM   #7
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I have Ford 30 pounders in mine. Its a 383 stroker with 220 heads, Superam base and top. Mild custom ground cam, 1.5 rolling rockers, and full headers. I just installed a Dewitts radiator because car would overheat on hot days with the 383. Oh i forgot. I got a custom burned chip from Fastchip.
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Old 11-20-2006, 05:35 PM   #8
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Quote:
Originally Posted by Pete K
Consult with the tuner before purchasing the injectors. You will likely get split opinions to the 24 vs the 30's. I am running 24's on a similar combo.
I have found the same thing. At what point does everyone agree that 30# injectors are the way to go?
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Old 11-20-2006, 05:37 PM   #9
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Quote:
Originally Posted by zo1boy
I have found the same thing. At what point does everyone agree that 30# injectors are the way to go?
No one agrees, unfortunately. Heated battles over it sometimes. In my case, motor never goes above 6k rpm. 24's work well for me. If I was turning 7k, I don't know they would. Regardless, I have run the ford 24's since 1993 with no troubles. Quality injector at a fine price.
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Old 11-20-2006, 05:41 PM   #10
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Probably 30's but you should talk to whomever is tuning it first.
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Old 11-20-2006, 05:43 PM   #11
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Quote:
Originally Posted by Pete K
I have run the ford 24's since 1993 with no troubles. Quality injector at a fine price.
Are you running svo's?
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Old 11-20-2006, 05:44 PM   #12
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Quote:
Originally Posted by zo1boy
Are you running svo's?
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Old 11-20-2006, 06:15 PM   #13
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If your tuner said #24's go with them. I had #28's but my tuner said they would be maxed out and I should go with #30's. So that's what I went with, Ford #30's. The Lightning has #60's because the tuner for that said they would be better than the stock #40's. Both seem to run pretty well.
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Old 11-20-2006, 06:15 PM   #14
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Quote:
Originally Posted by Archaea
What's the problem with going with too large of an injector - ?
if the injectors are too large for the demand the pulse width will be too short and you will get poor fuel atomization I doubt the hp loss will be noticable but the diff in gas milage will be
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Old 11-20-2006, 07:01 PM   #15
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is SVO a injector brand?

or is it a vendor shop?

link?

is there a injector in the middle? say a 26lb or 28lb that would be better? Why do most people jump from 24 to 30?
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Old 11-20-2006, 07:09 PM   #16
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Quote:
Originally Posted by Archaea
is SVO a injector brand?

or is it a vendor shop?

link?

is there a injector in the middle? say a 26lb or 28lb that would be better? Why do most people jump from 24 to 30?
SVO= Special Vehicle Operations...Ford Performance

I went with 30lbers in my 383, which is similar to yours. I got them for $270 brand new. Ben
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Old 11-20-2006, 07:10 PM   #17
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http://www.fbody.com/calc.htm

according to this link I'd need a minimum of 35lb injectors if I had hoped to make 450HP.

The 24lb injectors are only good to 307HP, and I better be making more than that

the 30lb injector is good for 384HP and I am hoping for more like 425ish HP or so.

Is this tool not applicable?

Go to the bottom of the link above to see the calculator.

Last edited by Archaea; 11-20-2006 at 07:14 PM.
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Old 11-20-2006, 07:16 PM   #18
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Quote:
Originally Posted by Archaea
http://www.fbody.com/calc.htmThe 24lb injectors are only good to 307HP, and I better be making more than that

the 30lb injector is good for 384HP and I am hoping for more like 425ish HP or so.
My stock 24# injectors are pretty well maxed out at 375 rwhp.
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Old 11-21-2006, 06:16 AM   #19
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You said it was a 383 with a superram, but what else has changed, ie cam, ported heads, etc. If Alvin told you the 24's are fine, and he is going to tune it, then that is what I would use. If it turns out it needs bigger injectors, changing them and readjusting the tune is not that big of a deal.
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Old 11-21-2006, 07:14 AM   #20
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Quote:
Originally Posted by Archaea
http://www.fbody.com/calc.htm

according to this link I'd need a minimum of 35lb injectors if I had hoped to make 450HP.

The 24lb injectors are only good to 307HP, and I better be making more than that

the 30lb injector is good for 384HP and I am hoping for more like 425ish HP or so.

Is this tool not applicable?

Go to the bottom of the link above to see the calculator.
Don't believe everything you read. Ask your tuner!!!!! If the calculator you used was always correct do you think I could run high 10's and still run slightly rich at WOT? Real world experience has proven 24# SVO's are good for quite a bit more than the calculator may recommend.

This can be a very heated debatable subject. Use what your tuner prefers.
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