Wires are routed through a grommet in the fire wall. The LC-1 is strapped to the side of the transmission, where the connector bundle is located. The wiring runs forward along the trans, up through the mess of hoses and wires on the driver side of the engine and in through the grommet near the clutch master cylinder. The LC-1 signal wires run through the grommet on the left side. The red wire is a fused lead from the positive battery terminal that feeds the LC-1.



There are constant +12 VDC and switched +12 VDC test ports that are accessible on the under-dash fuse block. I'd bet they are fused, but I'm not sure what their current capacity is. I ran a dedicated +12 VDC line from the battery and used a relay that I tied into the "switched +12 VDC" to actuate the relay. The LC-1 is on anytime the key is in the "on" position.

 

Some notes after installing and tuning with the GReddy EMU.

BTW I have had no issues with the Boomslang harness as delivered on my AP1 (MY03).

Regarding cruising with the tuned EMU installed...

The EMU has four switches on the front panel that can be easily mapped to the tables (VTEC, timing, fuel) used for tuning. This allows the tune to be disabled by flipping three switches. Beware that when you turn off the VTEC table that you no longer have any turn on of VTEC. I did this when driving to San Diego for the Tour. Once there it was turned on. Also note that the stock ECU had to settle out at the new atmospheric conditions. This was done by driving around on the streets and doing the test and tune at the Tour.

If you trailer your car to events and the atmospheric conditions are different front the last time the car was run then you should get it off the trailer and run it enough to settle out the stock ECU.

I have gotten CEL codes at idle on a number of occasions. They are always the same... The code is P0171 which translates to "Oxygen Sensor System Too Lean." In the pending code memory there are two codes... P0170 which is "Fuel Trim." The other one is P0420 which is "Catalyst Efficiency Low." This appears to happen only at idle and when the stock ECU is adjusting to new conditions. I just clear the codes and they don't immediately happen again. I need to observe more, but for the last two events I got the codes after the events when sitting at a light. Maybe the ECU is compensating after running under high loads at the event? I've also got the codes after a run while the car is idling in grid. I have not seen a code in weeks since it was last generated, right after the last event. Since I have a Wi-Fi OBDII interface it is easy to clear the codes with an App on my iPhone. This translates to only being a slight annoyance. Anyone else seeing this?

 

My car is also a MY03 and EMU with boomslang. Its been a week since PTuning installed and tuned it. I have not had a single CEL and I drove to work everyday this week in the S2000. I have not been to any events though and I don't trailer my car. I have noticed my mpgs are about the same (i'm actually doing really well on this tank of gas ) Which makes me curious as to why you would want to turn it off?

 

Rob (Random1),

We tested two separate harnesses of the same model number as yours with the same misfiring problem on two separate cars, a 2000 and a 20003. Toan at PTuning made changes that hopefully have solved the problem, and if we can confirm lack of codes over time, I invite you to try a modified harness. I actually bought a brand new harness from Boomslang to facilitate the process since Austin was going to be without his for a while as his harness that was used as a sample was sent back to Boomslang to point out the problems in wiring associated with the AP1s. I would wonder if your car is misfiring somewhat and you are not aware of it?

And I appreciate your PM with the jumper settings and everything that you used. We had actually found that on your brilliant STR Development page ... and Toan tried all of that without success. Every car would misfire enough that he decided not to proceed with the tune.

So you all may be getting a reworked version from Boomslang courtesy of the R&D efforts by PTuning, or my may send your current harnesses in there for rewiring now. I'm actually curious whether the modified harness would solve your problem Rob, and once I get back the official rewired harness from Boomslang maybe I will PM you.

 

I did not want to drive most of a 500 mile trip in VTEC. The engine speed is over 4000 RPM when going 75 MPH or higher. The way the tuner set mine up VTEC comes on at 3900 RPM with partial throttle. I find that my gas mileage is about the same as without the tune.

 

I am very interested to know what the difference is from the as delivered state to the corrected state and if it is consistent. Has this been documented? Can you share it with us?

 

Ok got it, thanks! Mine is tuned to only engage vtec at like 70% throttle or something and to engage vtec at 6000 regardless of throttle. Thanks for the info.

 

BTW there is nothing wrong with ringing out your harnes and creating a schematic and posting it.

It would look like this which is of an AEM Civic harness. Even without the signal names this would be useful. Just the pin number mapping is all that is required.

This will take some time to make sure it's accurate. Doing it with two people is best. A table in Excel will work just as well as a drawing.

I will consider doing mine once I get a big enough break between events.

Any volunteers?

 

I am willing to do my harness once i have a spare moment. Thanks for the picture it will help.

On another note, anyone figure out a good way to stuff all the extra wiring behind the pick panel? I have an EMU greddy harness. I zip tied mine to high hell and still not enough to secure using the push connectors. I think i will have to tap the holes to the nearest thread size and bolt the panel to squish it all in there. I have it somwhat secure using a ziptie of the cover near the hood release, but it is encroaching on my dead pedal area and will not work for autocrossing. Do you guys run without it but keeping it in the car somewhere?

 

Rob and I worked to figure out a means of packaging the harness behind the kick panel. The jumper harness needs to be tucked behind the stock ECU case. Post #333 from this thread shows my pictures of the packaging.

STR ECU Discussion: Post #333