Injector swap
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Junior User
Joined: Feb 2004
Posts: 58
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From: Houston Area TX
Injector swap
I am considering changing out my injectors... I've got two that are not working properly and I want a performance mod.
How do I find out what the fuel delivery rating is of the stock injectors?
I have read (on a performance/mpg website) that 41# is the optimum for a '96 big block application, but I have a '93 5.0 Speed Density EFI, EEC-IV, E40D electronic overdrive.
Anyone have any suggestions on my best options... obviously, I will be chipping it to get the correct computer response, but what about the fuel pump? Can I tweak it a little to adjust the fuel flow? If so, How?
I will also be installing a twin 61mm Throttle body and a 1" fuel plenum/intake spacer to even out air flow mixture and provide more low-end torque. Later, gt40P heads, but that's a completely different nightmare.
Anyone?
How do I find out what the fuel delivery rating is of the stock injectors?
I have read (on a performance/mpg website) that 41# is the optimum for a '96 big block application, but I have a '93 5.0 Speed Density EFI, EEC-IV, E40D electronic overdrive.
Anyone have any suggestions on my best options... obviously, I will be chipping it to get the correct computer response, but what about the fuel pump? Can I tweak it a little to adjust the fuel flow? If so, How?
I will also be installing a twin 61mm Throttle body and a 1" fuel plenum/intake spacer to even out air flow mixture and provide more low-end torque. Later, gt40P heads, but that's a completely different nightmare.
Anyone?
Posting Guru
Joined: Apr 2002
Posts: 2,244
Likes: 1
You might want to take this question over to the performance engine forum on this site. You'll get more people seeing it there.
With a speed density EFI system I think you can pretty well froget about a larger throttle body or larger injectors.... Smarter people than me will likely tell you that as well.....
Later,
With a speed density EFI system I think you can pretty well froget about a larger throttle body or larger injectors.... Smarter people than me will likely tell you that as well.....
Later,
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
Larger throttle body is do-able, but stick with stock injectors unless you want to get a computer chip. The stock injectors are 19lb/hr (orange tops), which supports around 300 horsepower. The fuel pump doesn't flow very much, but should be good for as much as the 19lb injectors are good for (horsepower wise).
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Junior User
Joined: Feb 2004
Posts: 58
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From: Houston Area TX
Okay, thanks guys, but just for the sake of argument, if I decided to put say... 24# injectors in, what color are they and how would I go about tweaking the fuel pump?
My longer term plans include a cylinder rebore with a stroker re-build and cam bump-up.
I definitely will be adding a chip.
My longer term plans include a cylinder rebore with a stroker re-build and cam bump-up.
I definitely will be adding a chip.
Last edited by 93superflare; Mar 24, 2004 at 10:52 AM.
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
24lb/hr injectors are blue tops. I'd say that instead of tweaking the fuel pump, get a new one with a higher flow rating, say around 155 lph or so. You'd need one for each tank if you have dual tanks. With a stroker, larger injectors would probably be a good idea, and since you plan on getting a chip, make sure the chip maker knows that you have bigger injectors so they can program the chip to use the injectors correctly.
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