So who wants their ECU's "Chromed"?

[rdmelton]

I finally installed my 560 evo injectors, and noticed something interesting. The o2 sensor labelled as rear (which is actually the front sensor, as someone else pointed out), was not oscillating as expected at idle, and the o2 trim feedback was "stuck" at -25% and would not change. When I would rev the engine the o2 sensor would then oscillate/respond, but at idle it would go back to reading lean (near 0). The o2 sensor labelled as front (actually the rear), was oscillating normally at idle, and the o2 trim was changing.

So I swapped out the o2 sensor that wasn't oscillating, and the same thing occurred. I swapped it out again with another sensor and still the same thing. At this point, I was suspicious of something in the ecu code because it was unlikely 3 o2 sensors were bad. I have several of the periphery bits disabled because I have removed EGR, EVAP, rear o2s, etc and so I wondered if one of those was causing it. Anyway, I went back to the stock tune, and only changed the fuel injector size and latency tables (I did not alter any of the periphery bits), and as soon as I started the car both o2s were oscillating like they should. After some troubleshooting, I found that it was periphery0: bit02. The name says that it disables downstream o2s but apparently it does more than that.

[Greg E]

You're right rob. A number of the peripheries do a lot more than what they're labeled for. This is what I've been working on lately and what's been delaying the release of v2. Fortunately, I've got that part finished up.

The periphery disassembly is the main reason why my car is still stock. There no other way to test it all without one.

[Greg E]

Links rehosted!

[jras312]

Is that why my ecu is taking so long to get into closed loop and I'm getting that CEL after about 100 miles? I guess I'll try resetting my perepheries back to stock and see how my car acts. My o2's wont show any activity either.

[Greg E]

Is that why my ecu is taking so long to get into closed loop and I'm getting that CEL after about 100 miles? I guess I'll try resetting my perepheries back to stock and see how my car acts. My o2's wont show any activity either.

Using the periphery set Aaron posted makes the car think its a JDM setup with only one sensor. It'll work but only use one bank for closed loop.

I've run into the issue you're talking about and that wa caused from having the injector scalings waaaay off.

[Vishnu]

Can you measure the resistance of your EBC solenoid? If it's between 36 and 44ohms you can wire it into the stock plug BCS and the ECU can handle it.

Ok . . . the stock boost solenoid WILL NOT work under higher boost. It just can not bleed enough air wuickly enough. Any BCS will work as long as the following two conditions are met:

It does not draw MORE than 400 mA - I think ALL mitsubishi solenoids will pass this test. If you don't know, you can measure it. Jsut use your volt meter to measure the current while connecting the BCS directly to your car battery.

It is normally closed and opens when voltage is applied

Found this little gem on evolutionm.
The resistance tolerance range for the stock BCS (note: Evo X Stock) is from 29 ohms to 36 ohms.

The GM 3-port I've read in multiple places runs 25ohms.
Grimmspeed is made to emulate the stock BCS voltage draw and resistance.

I haven't found(looked for) my multimeter yet, so I can't test the one I have in my posession yet.

How well does that 29-36 ohm range work for us?

[Greg E]

Found this little gem on evolutionm.
The resistance tolerance range for the stock BCS (note: Evo X Stock) is from 29 ohms to 36 ohms.

The GM 3-port I've read in multiple places runs 25ohms.
Grimmspeed is made to emulate the stock BCS voltage draw and resistance.

I haven't found(looked for) my multimeter yet, so I can't test the one I have in my posession yet.

How well does that 29-36 ohm range work for us?

I have that exact 3port chilling in my closet. What they do is put a few resistors inline to match up the resistance. The only reason I haven't tried it yet is the connector is different. I want to try using the FPR solenoid first.

[Vishnu]

do you have the GM or the Grimmspeed? I have a grimmspeed on my evo, and absolutely I love the thing. I should see if they'd be willing make one for our power requirements.

I took my old stock BCS harness out and put a standard 2 wire harness from amazon for the part that connects to the BCS, the other end goes right into the factory harness so it's easy enough for me to swap in and out different ones. The original OEM connector is now connected to one of the 2 wirer harnesses I bought, so I can switch back to oem real quick too. I just need to know a bcs setup that won't blow my ecu.

[Greg E]

Look for MrFreds BCS test thread. He literally bought all the options and tested them to see which had the best response times.

As long as your resistance is within spec, it'll work.

Can I see a picture of your adapter harness?

[Vishnu]

Here's my BCS right now, I'll probably put better connectors on before I use it.