97 4.0 fuel delivery and ignition - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 03-30-2009
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97 4.0 fuel delivery and ignition

I've heard on other forums that you can swap the injectors from 19 lbs (i believe that's the stock size) to 24 or 30 lbs. Is this true? If so, i assume ill need a new fuel pump? Would i need bigger fuel lines? I wanted to try this and add a screamin demon coil pack with msd wires and some performance plugs. If anyone has any info that would be great.
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Old 03-30-2009
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You would`nt need a new fp or lines. You will need a custom tune though for the larger injectors. Are you planning on adding some kind of forced induction? If not, its pretty pointless. You wont see any gains from larger injectors. Also, the stock coil is pretty good (up to 400hp according to Doug). I`d just save your money and go with wires and plugs...
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Old 03-30-2009
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i was going to add a bbk throttle body and eventually a bama programmer, but if forced induction is the only circumstance i would see gains then im gonna save myself the trouble. as far as the coil, ive read so many good things about the smooth idle and the larger gap with the the screamin demon. i can afford the $100 for one, and i already have the msd wires from my old truck. they're 8.5mm. thanks for the help, im going to read up on plugs.
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Old 03-30-2009
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why? are you stoking it and re-caming it? adding Nos? supercharging it?

dumping more fuel into it and changing to a hotter plug really isnt gonna net gain you anything besides watching the fuel gauge work faster
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Old 04-01-2009
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Im planning on doing a cam eventually, if that by itself makes any difference. i was just wondering why some guys ran larger injectors and if they would make a difference. I wont be changing them, based on what ive learned here.
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Old 04-01-2009
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All you will have is a lighter wallet!
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Old 04-01-2009
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Quote:
Originally Posted by Takeda View Post
All you will have is a lighter wallet!
You can do different injectors and a pump but you need to understand the reason you would want to. If you plan on turbocharging you will have more air and need more fuel to keep the recipe right. The simple way to do this is called fuel map scaling. It is like a ratio style problem.

For example, in my car I went from 600CC injectors to 1000CC injectors. I went with a bigger turbo than my stock one so I could get more air at the same boost levels. You have to scale back the pulse width so it is only open 60% as much as it was before. Think of it like a squirt gun. To get the same amount of "water" with a super-soaker compared to a kiddie squirt gun, the supersoaker would just barely have to have the trigger pressed for a split second, while the kiddie gun would be shooting for quite some time.

I don't know about the Ranger ECU but going with injectors that are too big on a stock ECU is like trying to fill a shot glass with a garden hose. I have a hard time tuning anything bigger than 1200CC on a stock Subaru or Mitsubishi ECU.

Oh yeah, of course you also need to have the proper pressure to the injectors, but that should be done before the injectors are installed.

If you put bigger injecors in without rescaling it will run rich and throw codes, and more than likely ruin converters if it is done long enough. The computer will try and compensate but it will be too confused to do it properly.

I think you are wasting your time doing this unless you have some sort of turbo/supercharger.

Always remember that engines work like making macaroni and cheese. Have you ever made the Macaroni with not enough milk and too much of the powder? It tastes too dry and lumpy then. Have you ever made it will too much milk and not enough powder? It gets all runny then. There is a magic recipe for air and fuel too. More fuel without the air to match it won't help.
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