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EEC-IV tuning options?


holyford86

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Over the past few weeks a friend and I have adapted a GM Eaton M62 supercharger to a 4.0 OHV. I know that the M90 has more potential but I wanted to be able to use the charger without modifying it to a great degree and the commonly available GM variants are too long to do that.

I am running this on a 93 explorer 4.0 that has been installed into an 86 ranger and it uses a 94 Ranger EEC (I know its federal emissions but unsure of the code as the truck isn't currently at my house). The engine currently has the stock 19lb injectors and is running the stock pulley which gives me about 3psi, it runs fine like this but a smaller pulley is on its way and the math tells me I'll be at about 7 psi which is where I want to be. I also believe I'll need to move up to a 24lb injector to support this boost level.

I've been researching tuning for this and have come up with a couple different options. I've noticed tuned mass airflow sensors are a thing but it seems like a bandaid. I've also seen that I could put a piggyback chip in the EEC which seems like a better option. Are there people that can make me a custom tune on a chip without dyno time or would that be a bad idea?

I will be using this truck pretty regularly and will be using it as a truck still so I would rather be safe and leave a few hp on the table than go all out and risk damaging things. I have a wideband and gauge I'll be installing before I drive it too much so I'll be able to keep an eye on things just in case.
 


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franklin2

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Time for you to divorce yourself from the EECIV. I am not up on all the aftermarket fuel injection setups, but they are becoming more and more common place and while they are still pretty expensive, they are coming down in price a little bit. You will be well rewarded if you get a computer system on it that you can work with.
 

JOLENE_THE_RANGER

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you could have someone load a tune on a chip for you and send it out, ive known a few friends to do that, but the bestway especially when running boost is to do it on a dyno so you can watch you air/fuel levels throughout the rpm range. theres absolutely no difference between tuning your computer and a obd2 once youre on a dyno, hell, you could even do a street tune if you wanted.
 

Elutheros

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I'm running a MegaSquirt Plug and Play ECU on my 5.0 and it's great. The learning curve is steep--for any of the tuning but I'm a 70 year old digital immigrant and I figured it out. I don't know what they might have for the 4.0 but it's worth checking. DIYAutoTune.com
 


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