[96greenGT]

I have searched here and google in an attempt to find out what the colors of injector tops mean. I know in my stock ride, I have 19# injectors, but does anyone have a list of colors to # ratings or along those lines? And what are the power limits of said colors? Thanks in advance.

[HMUSN]

Gray = 14 lb. (5.0L Ford Truck)
Yellow/Orange = 19 lb.
Light Blue = 24 lb.
Red = 30 lb.
Brown = 35 lb. (4-cyl. SVO Turbo) (Low Impedance)
Dark Blue = 36 lb.
Lime Green = 42 lb.

[HMUSN]

Applications and limitations

Here is an example of a 24-pound injectors limitation of the horsepower it can support.

24 pound injector (BSFC of 0.57) and at 90% duty cycle can support 303 hp.
24 pound injector (BSFC of 0.57) and at 95% duty cycle can support 320 hp.
A 24 pound injector at 85psi will now flow the same as a 35 pound injector
A 35 pound injector can support 453 bhp at 95% duty cycle.
The same injector will now support 429 hp at 90% duty or 455 hp at 95% duty.
The same injector can now support 125 BHP more by simply increasing fuel pressure.
**Note that these numbers apply to a 4.6 litre engine. A 5.0 has a slightly higher BSFC and will
lower the numbers it can support slightly.

Here are some examples of injector sizes and their maximum horsepower applications. Two numbers will be giving for every spec. One is the optimum operating range (85-90% duty cycle) the other is a higher 95%. Which is safer? It is all a matter of opinion, it all depends upon how hard you want to push your injectors. The harder you push them, the greater the risk for potential problems. All horsepower is
measured in flywheel horsepower

30 pound injectors at an engine BSFC of 0.57 and at 90% duty cycle can support 378 hp.
30 pound injectors at an engine BSFC of 0.57 and at 95% duty cycle can support 400 hp.
A 30 pound injector at 85 psi will now flow the same as a 43 pound injector.
A 43-pound injector can support 573 bhp at 95% duty cycle.
**Note that these numbers apply to a 4.6 litre engine. A 5.0 has a slightly higher BSFC and will
lower the numbers it can support slightly.

36 pound injectors at an engine BSFC of 0.57 and at 90% duty cycle can support 454 hp.
36 pound injectors at an engine BSFC of 0.57 and at 95% duty cycle can support 480 hp.
A 36 pound injector at 85 psi will now flow the same as a 52 pound injector.
A 52-pound injector can support 693 bhp at 95% duty cycle.
**Note that these numbers apply to a 4.6 litre engine. A 5.0 has a slightly higher BSFC and will
lower the numbers it can support slightly.

42 pound injectors at an engine BSFC of 0.57 and at 90% duty cycle can support 530 hp.
42 pound injectors at an engine BSFC of 0.57 and at 95% duty cycle can support 560 hp.
A 42 pound injector at 85 psi will now flow the same as a 61 pound injector.
A 61 pound injector can support up to 813 bhp at 95 duty cycle.
**Note that these numbers apply to a 4.6 litre engine. A 5.0 has a slightly higher BSFC and will
lower the numbers it can support slightly.

50 pound injectors at an engine BSFC of 0.57 and at 90% duty cycle can support 631 hp.
50 pound injectors at an engine BSFC of 0.57 and at 95% duty cycle can support 666 hp.
A 50 pound injector at 60 psi will also act like a 61 pound injector
**Note that these numbers apply to a 4.6 litre engine. A 5.0 has a slightly higher BSFC and will
lower the numbers it can support slightly.

[96greenGT]

thanks for the reply/info !!!

[FranMan]

are the 19#'s high impedance? What happens if you try to run low impedance?

[StangAddiction]

You can't run a low impedance injector on the 4.6 because the injector driver is a high-impedance...You'd have to convert to a low-impedance driver...It's a waste of time IMO...Just get a different set of injectors.. The only time i'd reccomend changing the driver is if you're going over 60 lbs injectors.

[Fast98stang]

make this a sticky