Ok thanks, I called and canceled my order and I'll run by Walmart later to pick one up.

 

I got the car started today with the emanage ultimate plugged in with the greddy ap1 harness. Although I'm throwing a CEL. The code is P0122- TPS/pedel position sensor A circuit low input. Any idea whats causing this? The car was wanting to idle at 600-700 rpms.

 

You need to reconfigure the TPS signal wiring or enable your synthesized TPS signal. I'd bet money the EMU is currently set up to feed the stock ECU a synthesized TPS signal. This is how turbo EMU setups make the ECU run in open loop fueling control at low throttle angles.

Give the following settings a try, clear your CEL and see if it returns. If it doesn't, you'll either need to continue running the below settings or reconfigure your harness (it's one of the bullet-connector options).

Enable your TPS analog output signal via this selection option -


Enable the Analog Output table -


Check to make sure you're not altering the TPS signal -

 

Jake,

It worked! No check engine lights. It would idle for a few mins around 800-900RPMs and then it would randomly drop to 700RPMs and kill its self. I drove around the block twice and it died on me once at a stop light and once when I was sitting in my driveway. Ideas? I'm guessing I need to take out the 5.0 column and make a .23 column because that's my "min". My max is 4.46 so the 4.4 and 4.7 will cover that range. I think at idle it may still be sending a lower voltage signal causing it to idle down since I just used the default .5-5.0 range. With my 0% throttle being .23 it's not being corrected by this range. It's just a guess but I'll try it tomorrow.


edit- Here's what I did, Hopefully this fixes it. In my head it makes sense.



Jake PM me your email and I'll send you "my tune" to look over. If you don't mind?

 

Very interesting...would this work well for our NA STR setups to allow part throttle tuning and prevent the stock ecu from learning and "fixing" the tuning through its short term and long term fuel trims?

I've heard there are a few other tricks to get the stock to stay in open loop as well, like disconnecting the o2 sensors, etc. If one of these works well consistently, that would be great.

 

^ in for answers to the same question. Open loop tuning possible for na cars? Thats kinda huge.

 

Just thought I would repost this as it has my AFR curves. The tune was done by UMS Tuning in Mesa, AZ. I can't share the file, but figured it might be helpful for you guys to take a look at.



I have been debating taking it back to UMS for a second look because my tune seems to run slightly leaner than other people's tunes. However, I am hesitant to do so simply because UMS has tuned several S2000s on emanage, and Tony knows far more than I do about this stuff.

 

The Mugen ECU also runs very lean. I swear my car feels more powerful with 92 octane vs 93. I know that can't be right though.

 

I don't see why you couldn't use this feature to kick the stock ECU into open loop at lower throttle positions.

I'm still confused as to why people are concerned about part throttle tuning. If I want more power...I can just give it more throttle. For an NA setup, a WOT tune should be all that is needed....right? Maybe I'm missing something. Also, you're then tasked with tuning a much larger operating range of fueling and timing. I'd rather let the stock ECU control as much as possible and only tweak WOT tune parameters to maximize the power/torque potential under high loads and high throttle angles.

Open loop tuning has always been possible with piggybacks. It's the ability to tune fueling when the ECU is in closed loop that is not possible with a piggyback (an STR legal piggyback, that is )

Josh, let us know how your changes work out. Most of my suggestions in this thread have just been educated guesses. I have never used the "Analog Output" map. My car had the same CEL when I first installed my EMU, but I reconfigured the harness to solve the problem.

 

Heres my lenthy post before going outside to mess with it. In hopes of posting up all these questions I'm expecting other people to have the same questions and hopefully help them and me.

this is the harness-

You mentioned you changed the bullet conectors to fix this "problem" do you know which ones you changed?

Right now I have a green bullet connector from the EMU connected to a yellow wire in the blue plug (ecu side). The other bullet connector is a purple/yellow wire comming from the EMU connected to a purple/yellow wire that goes to the engine harness (gray plug, the female plug that the blue engine harness plug would connect to)

That leaves 6 other wires not plugged into anything

-2 come from the EMU, a brown/green and a white/orange, they both come together to form a connector but I'm unsure what that connector is for.
-a red that comes from the engine side (middle port) of the harness (extra power cable maybe)
-a black that comes from the engine side (middle port) of the harness (extra ground cable maybe)
-a purple/yellow that comes from the engine side (female port for blue plug) of the harness (no clue what this is)
-a yellow that comes from the engine side (female port for blue plug) of the harness (no clue what this is)

If you know which plug to change I'll change it.