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Higher FP or bigger injectors?

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Old Oct 11, 2004 | 03:50 AM
  #1  
gta324's Avatar
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From: sweden
Car: GTA -89
Engine: Blown 415"
Transmission: 4L80E
Axle/Gears: Strange 12-bolt
Higher FP or bigger injectors?

Hi...

What are the pro/cons of getting bigger injectors vs. raising the FP?

For my app:
I need bigger injectors I have found 2 that looks good
- 65 lbs p/h
- 57 lbs p/h

What would be best
- use the 65 at 43 psi or
- use the 57 with rasied FP to gain better spray pattern, maybe?

/N.
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Old Oct 11, 2004 | 07:56 PM
  #2  
prOject-IrOc's Avatar
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From: Gilbert
Car: 1990 Iroc-Z
i've heard you should always go bigger, means they will not have to work as hard.
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Old Oct 11, 2004 | 11:59 PM
  #3  
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From: sweden
Car: GTA -89
Engine: Blown 415"
Transmission: 4L80E
Axle/Gears: Strange 12-bolt
Ok, but if I go #57 and raise the FP so that they will be #65, how about the spray pattern?

#65 at 43 psi vs #65 at 55 psi?

/N.
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Old Oct 12, 2004 | 12:58 AM
  #4  
sellmanb's Avatar
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From: Tigard, Oregon
Car: '86 Berlinetta
Engine: 350
Transmission: 700R4
bigger is better. your pump will not have to work as hard with the bigger ones... it's all good then Dont worry about spray patterns.
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Old Oct 12, 2004 | 01:20 PM
  #5  
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From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Get the largest injectors you can afford.

Up the fuel pressure. I'm running around 50psi at idle.

Then set the bpw really low.

Don't listen to folks running stock setups and expect any sort of advice on injector selection. Leave it up to the diy_prom guys who have experimented with multiple setups.

-- Joe
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Old Oct 13, 2004 | 11:54 PM
  #6  
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From: sweden
Car: GTA -89
Engine: Blown 415"
Transmission: 4L80E
Axle/Gears: Strange 12-bolt
Largest I can afford? hmm, that was a new one

I guess it will be 65lbs or 72lbs then...
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