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Injector constant?

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Old Sep 17, 2002 | 11:11 AM
  #1  
RBMZ28's Avatar
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From: va.beach.va/usa
Car: 87 IROC (low 12's)
Engine: 400 sbc .040 over
Transmission: 700r mod
Injector constant?

I am currently using 32lb. injectors with the constants set at
26.This method has gotten the blm/intergrator to 128+/-.
My question is if the the car required 32lbers(presumably at wot
would the 32lbers pulse up to 32 or the 26(and the values it carries) put in as a constant?I've tried adjusting pulse width using the battery voltage and (I think)the base pulse width method with out success.Car runs fine lowering the constants to
get to 128blm, but read some where in here it is best to match(or come close) the constants with the actually injectors used.Any info or advice would be appreciated.thanks in advance
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Old Sep 17, 2002 | 11:26 AM
  #2  
Morley's Avatar
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I think you are misunderstanding what you have done by using a 26# constant. What you are doing is telling the computer you have smaller injectors than you actually have, so the computer pulses them longer to get what it needs. So right now you are actually flowing more than the 32# rating. 26 isn't too far from the 32#'s the injectors were rated for and shouldn't present a problem, but if you want the injectors to be closer to what your engine seems to be needing, then I'd try 36#. Doing it this way gets expensive though.
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Old Sep 17, 2002 | 11:36 AM
  #3  
Boxeat2469's Avatar
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From: near Chicago
What is your fuel pressure at? If you up the fuel pressure some, you could change the injector constant to get you closer to being correct.
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Old Sep 17, 2002 | 12:58 PM
  #4  
RBMZ28's Avatar
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From: va.beach.va/usa
Car: 87 IROC (low 12's)
Engine: 400 sbc .040 over
Transmission: 700r mod
fuel pressure is at 45.By 36#,do you mean change constant
or change injectors?
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Old Sep 18, 2002 | 12:47 PM
  #5  
Craig Moates's Avatar
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From: Baton Rouge, LA, USA
Car: 87 T/A
Engine: 441 SBC 12.5:1 0.680" Lift
Transmission: T-56
Axle/Gears: 4.10 TruTrac Moser 9"
Your MAF is gutted...isn't it...
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Old Sep 18, 2002 | 01:31 PM
  #6  
Morley's Avatar
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Originally posted by RBMZ28
fuel pressure is at 45.By 36#,do you mean change constant
or change injectors?
Meant change the injectors, but this is an expensive option.
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Old Sep 18, 2002 | 04:54 PM
  #7  
RBMZ28's Avatar
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From: va.beach.va/usa
Car: 87 IROC (low 12's)
Engine: 400 sbc .040 over
Transmission: 700r mod
no maf is stock.thought about porting and removing screens
but was advised(grumpy) not to.any thoughts on this??
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Old Sep 18, 2002 | 07:15 PM
  #8  
87_TA's Avatar
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Joined: Dec 2001
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From: ELIZABETH,PA,USA
Go for it,
It would be worth the extra airflow with that combo no doubt.
Especially since you do your own proms you can fix the leaness
at idle you "might" get.
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