Need info on SplitSecond ESC1 experiences

[midiwall]

Hey all;

I installed a SplitSecond ESC1 last night and have a couple of questions.

Precursor:

• It is wired into a switched power source
• I only have the FRONT O2 sensor wired in, not the rear
• The vacuum/boost feed is hooked up and is valid
• I am using the GREY/GREY-BLACK wire set
• Red to positive, Black to frame ground

I have the following issues:

• With the engine running in vacuum (e.g, idle or otherwise) the A/FR is showing a dead constant 14.7:1. Is this a feature?
• The concept of "force open loop on boost" doesn't work. Pushing any sort of boost will leave me in closed loop until I get to WOT "normally" with my foot to the floor.

Any ideas?

[Greedy]

Hey there mark! I had the same problem of sorts with mine - turned out that I had a bad unit though. I have since installed a new one but have not had to deal with the open-loop / closed loop issue due to the port fueler I am using. Anyways, are you using your scan tool to tell when you go into open loop? I know that with the bad unit I had in, it did not register as going into open loop untill about 9 psi - which at that point I was nearly at WOT when it should be switching anyways.

Have you tried plugging in some numbers on your fuel map while in low boost and seeing if it positively effects your af/r's. If it is working it should get you down to the 12:1. If not the stock ecu will correct it back to the 14:1. I will go out and mess with mine tonight and let you know how it registers on the scan tool.

[tour4fun]

Gregg, are you using the port fueler to throw in gas between closed and open loop? Are you running the AFR box as well?

Mark do you mean 14.7 only or more like swinging between 14.5-14.9?

BTW My car is at Split Second right now .

[MountainBiker]

Originally Posted by midiwall

With the engine running in vacuum (e.g, idle or otherwise) the A/FR is showing a dead constant 14.7:1. Is this a feature?

That is a feature of your Toyota ECU! It is also a feature of the SS unit because it didn't make it stray from 14.7

[Gadget@URD]

Originally Posted by midiwall

Hey all;

I installed a SplitSecond ESC1 last night and have a couple of questions.

Precursor:

• It is wired into a switched power source
• I only have the FRONT O2 sensor wired in, not the rear
• The vacuum/boost feed is hooked up and is valid
• I am using the GREY/GREY-BLACK wire set
• Red to positive, Black to frame ground

I have the following issues:

• With the engine running in vacuum (e.g, idle or otherwise) the A/FR is showing a dead constant 14.7:1. Is this a feature?
• The concept of "force open loop on boost" doesn't work. Pushing any sort of boost will leave me in closed loop until I get to WOT "normally" with my foot to the floor.

Any ideas?

It appears to be working exactly as it should.

If you are looking for your scan tool to report OPEN LOOP when the unit is functioning it will not. What you will see is the mix go rich and the fuel trims go very positive. Now you can tune fuel rich like you were in OPEN LOOP while the ECU is still in CLOSED LOOP. It will no longer trim out your mix to the lean side.

The unit should be wired into the ECU harness as indicated on the URD connection guide. The power and ground need to be wired into the ECU harness. If you do it some other way you will likely have some issues you don't want to have.
Gadget

[midiwall]

Additional precursor info: The A/FR I'm reading is coming from a gauge that's piggybacked onto the narrowband output. It is NOT "real" in the sense that it's coming from my wideband. The REAL A/FR is _hosed_.

Originally Posted by Greedy

Hey there mark! I had the same problem of sorts with mine - turned out that I had a bad unit though.

argh. And I paid for express mail to get this up here in a day.

Anyways, are you using your scan tool to tell when you go into open loop?

Yeup, the Auterra.

I know that with the bad unit I had in, it did not register as going into open loop untill about 9 psi - which at that point I was nearly at WOT when it should be switching anyways.

Right, that's exactly what I'm seeing.

Have you tried plugging in some numbers on your fuel map while in low boost and seeing if it positively effects your af/r's.

Yeup, and there's no change.

Originally Posted by tour4fun

Mark do you mean 14.7 only or more like swinging between 14.5-14.9?

Oh no, this is DEAD constant at 14.7. It's just like the ESC1 is spitting a solid voltage and nothing else. In fact, it's so dead constant that I had to force fuel in at idle to keep the engine running. The ECU was so convinced that things were dead-on perfect that it wasn't doing anything.

Originally Posted by MountainBiker

That is a feature of your Toyota ECU.

Ummm, no it's not. On a 96, the front O2 sensor is narrow band and swings wild in closed loop. That's a natural occurance of narrow band O2 sensors and with the ESC1 in-line, it stops happening all-together.

[midiwall]

Originally Posted by Gadget

It appears to be working exactly as it should.

If you are looking for your scan tool to report OPEN LOOP when the unit is functioning it will not. What you will see is the mix go rich and the fuel trims go very positive. Now you can tune fuel rich like you were in OPEN LOOP while the ECU is still in CLOSED LOOP. It will no longer trim out your mix to the lean side.

Umm, okay, but why is this happening ALL the time, I thought it was only supposed to be happening in boost? If it's happening all the time, then what's the point of the boost hookup?

The way this is working, it looks like I could just pull my O2 sensor and have the whole fuel map open to me. Is that true? If it's basically just lying to the ECU that "all is well, here's 0.3v (or whatever)" to fake 14.7:1, then that takes the ECU fuel trim completely out of the picture ALL the time. That makes sense of course, but there's a whole lot of smoke & mirrors happening here in terms of what this product is _REALLY_ doing.

Why am I starting to think that the boost hook-up is just a mask to avoid issues with the EPA (or somesuch)?

The unit should be wired into the ECU harness as indicated on the URD connection guide.

ummm, Brian didn't include a connection guide. I only got the SplitSecond paperwork.

[Greedy]

One more thing I remembered. The T fitting supplied with the esc1 of mine was almost closed on one of the ends (like a restrictor fitting or something). Don't know if it was a defect or what but it didn't make sense to have it there so I replaced it. I doubt that yours is the same but might be something to check.

[midiwall]

Originally Posted by Greedy

One more thing I remembered. The T fitting supplied with the esc1 of mine was almost closed on one of the ends (like a restrictor fitting or something). Don't know if it was a defect or what but it didn't make sense to have it there so I replaced it. I doubt that yours is the same but might be something to check.

Thanks... but alas, it's a new T and clear. (you got a T with yours? Did you get something more than the potted-in length of hose as well?)

[Gadget@URD]

The standalone ESC1 is acts as a pass through unit until it is activated by boost. Then it replaces the signal from the O2 sensor with a signal generated by the unit. This signal prevents the ECU from triming fuel and allows you to richen the mixture with your MAF Sensor Calibrator.

The restrictor T fitting is specially molded to provide as restrictor in the line that the devices need to be connected to. Without this restrictor the supercharger impeller pulses will be transmitted through the vacuum line and beat on the internal MAP sensor and sometimes a buzz will be emitted.

Email URD and ask for the proper connection guide.

Gadget