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Discussion Starter · #1 · (Edited)
I recently finished installing the Howell Fuel injection and electric fan in my 89 YJ 4.2L... What a difference in the gas mileage im getting!!! I havent measured it, but I have just filled the tank and will check the MPG on the next fill up.... But I can see the difference just from what gas was left in the tank before filling up... I will report back!! :thumb:
 

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Yep.

When your driving down the road the air flow is cooling your radiator and your fan shuts off (in theory)

Even though carb guys will say carbs are better. Properly setup fuel injection mixes the air and fuel better thus in theory your getting the same power with less fuel.

Guess your proof these mods are worth it.
 

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FI doesn't have any of the issues carbs do, that's why NASCAR has even been switching over to FI. More power, less fuel consumption, no cold start issues, auto altitude adjustment, and so on and so forth.

The electric fan certainly helps to because when you're moving and you need that extra power, you get it. The fan generally only runs when you're parked at an intersection at idle (from what everyone has been claiming that has done the swap), so even though you get an initial parasitic draw on the alternator, it goes away once airflow starts moving through the radiator.
 

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Discussion Starter · #4 ·
Thats one mod that needs to be done asap!!! I have to install a larger amp alternator.... Any suggestions??? I was looking at the Mean Green from Quadratec..
 

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MoltonYJ said:
Thats one mod that needs to be done asap!!! I have to install a larger amp alternator.... Any suggestions??? I was looking at the Mean Green from Quadratec..
Powermaster is what i recommend. Ther are a lot of places that sell them.
 

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Just curious, what did you use for a fan? Did you buy a kit or something you pieced together?

Have been considering this for a future upgrade project.
 

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I'm wondering if putting on the FI system moved the power band up at all, or at least made it wider. Same with torque. Those 4.2's have the awesomest torque at low rpm, it'd be cool if it stayed right where it was.
 

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From what I've read around the forums it actually improves torque and HP across the entire power band, meaning it has increased torque and HP down low.
 

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Discussion Starter · #9 ·
Just curious, what did you use for a fan? Did you buy a kit or something you pieced together?

Have been considering this for a future upgrade project.
Derale Performance Waterproof Electric Cooling Fan from Quadratec. A little pricey but installed very easy.
 

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The electric fan certainly helps to because when you're moving and you need that extra power, you get it. The fan generally only runs when you're parked at an intersection at idle (from what everyone has been claiming that has done the swap), so even though you get an initial parasitic draw on the alternator, it goes away once airflow starts moving through the radiator.
Good info. Also to add, having an electric fan free's up the strain from the engine driving the belt that is cranking over the fan-clutch and stock metal fan, less strain = more power.
 

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new alternator

Don't see any reason you would need a new alternator. Unless the one you have is only rated for 25A or so. Even then it would be enough to run the stock load on the vehicle.
 

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Discussion Starter · #12 ·
Don't see any reason you would need a new alternator. Unless the one you have is only rated for 25A or so. Even then it would be enough to run the stock load on the vehicle.
I believe the factory alternator is something like 60A? I have a 5 ch 900w Alpine amp installed, two sets of Hella lights, etc.. Plan on doing a winch and some other mods.
 

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MoltonYJ said:
I believe the factory alternator is something like 60A? I have a 5 ch 900w Alpine amp installed, two sets of Hella lights, etc.. Plan on doing a winch and some other mods.
So turn off your aux lights and your stereo if you're going to use your winch.
 
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