I've got a 3.9 engine with TBI, would it improve the MPG by letting Megasquirt(or any other EMS) control the fuel? Has anyone done it before?

Thanks,
Ole

 

I know someone was talking about megasuirt before too. I'm not sure if im sold on getting a new system to replace your old one. You may see some improvement but not much. But go for it if you realy want to do it then set it up and let us know how it goes.

 

So no one have really tried it? I would really like to try it out, so I might give it a try when the winter is over. I've never worked with aftermarket EMS on TBI's before, but I've seen others make it work well.

 

MS works great. It can do anything the OEM computer does .But the good part is you can control what and how it controls .With 21lb injectors I got 26mpg ,or about 21mpg (US gallons) .I have not spent any real time trying to get the best mpg. I just switched to 19lb injectors from a crown vic for the better spray pattern to see if this will improve mpg.

 

does any one have a step by step on how to do this?? im getting 11 mpg on my 89 3.9 auto. with only 74000 original miles. just replaced the fuel filter, cap rotor , plugs and wires. and had the cat gutted. still only getting 11 mpg. i am the 2nd owner. truck was never abused. any info???

 

I built my first one when you could only buy the board from B&G directly and the parts seperate. My second one I got all the parts from diyautotune.com/ .They now sell complete systems ready to install. All the info is at MSEFI.com .I would change the O2 sensor first then grab a cpu from the wrecker. Oh and no more redline shifting.

 

If you want more mpg there is alot of things that would be alot easier than messing around with your fuel system. I've got a 95 Dakota with a 3.9 and i was only getting about 14mpg when i got it. I put a lower temp thermostat and a set of copper core plugs in it and my truck idled smoother and ran better. I also noticed that i picked up a few mpg. Then after i put a new air filter on, a new set of plug wires, and true dual straight pipes out the back i get about 21 to 22 mpg if i dont get into it too bad...i also noticed that my engine has a little more pep than it used too..

 

By true dual i assume you mean the pipes never join anywhere... how did you set this up, cause I've been wondering what to do about putting in an extra o2 sensor. My truck only has one after the pipes meet but if you run true dual exhaust you would need one on each bank.

 

Does the newer MPI intakes fit my engine?

 

If your refering to the magnum intakes then you will need to add the heads. Then it will fit. But you will need all the wires and computer to run the Injectors.