kanurys

Thanks for getting the readings. I didn't know the EA82 had a fuel temp sensor. I'd think you could hook it up directly if it were wired properly. Subaru uses thermistors for much of their temp monitoring, so as long as it's in a similar range as the Impreza sensor, it would just be a matter of hooking it to the ECU. I'll test that too, when I check my own cars...

At least it was only a couple of wires. There are always things like that on an engine/dash swap. Ideally yes. I will measure my both of own cars' readings but I want to be sure it will be compatible with your setup. If you can't find the Impreza stuff, I'll probably be ok since it's similar to my outback, but it would be nice to know what your readings are. I already have a design sketched up. I just need the observed resistances to calculate resistor values, etc... Once I make a prototype, I'll make two and send you one to test with your system. If that goes well, I'll design a printed circuit board and etch it so the electronics are a little more solid. I'd like to adapt this system for a EJ'd VW, as well. I just need to find a swap to test it on. I'm also thinking of putting some resistors in to fake out the fuel temp, pressure and vent signals into the ecu. It shouldn't add much electronics to the board. I'll be killing a few ecu codes with one fix.

Right on! What helped me a lot was to make a spreadsheet with columns for EJ wire color, Description and EA wire to hook up to. Then I had another column for extra comments. Here's a link to my 1999 impreza to 1987 Spreadsheet. I wonder if the wires are the same? Maybe it will be useful to you, somehow. Also get me the readings from the impreza if possible. I'll try getting some readings from my cars, too, but yours are just as important. The way I see it, the gauge sends a voltage to the variable resistor in the sender unit which is grounded. The signal either needs to be amplified or attenuated. I know how to do that, I just need to know the resistances I'm working with and how the systems are configured: either power from gauge or ground from gauge based on the year of the car... I hope that makes sense.

My smart phone is my cell phone as well as my scan tool, browser and camera. I've actually used it a lot on my Subaru projects in those capacities.

Yes it is for the o2 sensors. Its probably still attached to the ej transmission.

Nice work. The ignition stuff is really straight forward. I'd love to see pictures of the column switches you retrofitted. Also, I just got a bunch of parts in the mail and am ready to make a fuel gauge converter if you have the resistance measurements. Was the rs25 a single or dual fuel level sender vehicle? SK

Thanks, guys.

Do you guys think that $125 is a decent price for a dual range transmission out of an EA82 with 130000 miles? I'm going to go pull it tomorrow. The yard owner looked up the core and is charging me that. Its known to be in good working order. I'll refresh it anyways and have it ready to go when I... need to replace my current one. Also I might pull the rear differential and weld it up so I have it ready to swap in if I feel the urge. What's a good price to ask for that?

Hey, you might even get better gas mileage with the 3.9. (Just do it)

Where will you put the computer? I was going to put mine on the floor in its stock position, i was convinced to put in up high in the dash above the glove box so I wouldn't dunk it if I got in the water...

I don't think it would be much of a problem with the increase in low end torque from the frankenmotor. Maybe they'd balance each other out?

that rings a bell

I thought all abs connectors were either yellow or pink. Blue might be the junction between the dash harness and the rear chassis harness... anybody?

try this site: http://jdmfsm.info/Auto/Japan/Subaru/Impreza/2001/ look at the bottom three pdf's... As far as I know, the headlight relays are in the Main Fuse Box that is under the hood (the one you put in place of the EA82 coolant overflow reservoir). They're next to the A/C relay and the fan relays. You'd just need to hook the headlights to those and ground them... Or custom wire them up.

And c is just another resistor (gauge). So really, we're talking volts = current*total resistance Not sure how much current flows through the gauge in a stock setup, but the equation would look like 13.5=(plug measured current in here in amps)*(C+(1/((1/A)+(1/B)))) And solve for B I'm sure there are different voltages or other changes because of the signal coming from the ecu. How goes the cooling system woes?

Close ... actually it's C+ 1/((1/A) + (1/B) ) = total resistance

Yeah, the fuel temp, pressure and vent codes won't throw it into limp mode. If you can't rev over 4500rpm you're most likely in limp mode and need to deal with another code... good luck. Oh, and get me those resistance readings, when you can.

I predict I'm going to be spending some quality time with the fsm's.

I plan on making a dummy box to plug the fuel tank temp/pressure/vent ecu wires into. It will be for a phase II EJ engine, so it should be the same for yours. I could combine those with the fuel level conversion once I know they work on my rig. I can make the fuel level converter adjustable so you can fine-tune it to make the gauge work right. Is this something you want to pursue (in the future)? You probably just want to get it running, for now...

Well, not exactly halves the voltage, but makes a current divider, proportionally changing the current going through the sensor, instead of all the current going through the sensor. If the sensor and the resistor were at exactly 275 ohms it would divide the current evenly. A smaller resistor would mean that the sensor would have less effect on the gauge reading (more correction from stock). A larger resistor would mean the sensor would have more effect on the gauge reading (less correction from stock). http://en.wikipedia.org/wiki/Current_divider

Opps, my bad. It is a pull-down resistor. from numbchux ea2ea: "Solution 4: In theory, you could wire a 275 Ohm resistor from the wire between the sender and the gauge to ground,..." That's what I did and it worked great.

The fuel gauge wiring shouldn't be too hard if you have one from the impreza and the one from the GL. I think the Impreza is a two part gauge in series. I'm not sure about the GL. I'll look at the diagrams and see what needs to be done. What year impreza and GL, again? I assume the GL was originally carbed? You might want to swap in the FI tank off of an EA82 since it has bigger ports and surge baffles. If you have all the level sensors talked about above, could you measure the resistance of each in their max and min positions? I'll come up with a circuit to mimic the EJ stuff and you can hook it directly to the EA stuff... Kind of plug and play if you know where your wires all go.

You could put in the pull-up resistor and see what the gauge does. The 270 ohm 1/4w resistor worked great on my EJ swap. Make sure you connect it to 12v, not ground.

I'd totally do it if I had another wagon:) looking....

I always like to be setup to jump into a project on a whim. It sucks when you have to get past a bunch of hurdles just to get started... As for the VSS, I ended up making a transistor network which distributed a bunch of grounded signals, basically copying the VSS in the EA cluster... Yours will be easy if you're using the impreza cluster. The speed signal sender should bolt right into the trans where the EA cable is.