Dynamic EFI

Bringing TBI and Multi Port Fuel Injection to a New Level.

Connecting to and Using the Analog Data Logging Inputs


There are eight data logging inputs available on the EBL products. They are for devices that output a voltage within the range of 0 to 5 volts. Connecting a device that outputs a voltage higher then 5 volts can damage the EBL board.

The What's Up Display (WUD), logs these eight inputs. It will also display a WB set up and a fuel/oil pressure sensor in real time. The input data type and range is set within the Preferences dialog, ADC Channels tab. There are a handful of devices built in, it is also easy to create a User Device and select it in the Preferences dialog.

The following two sections show how to connect to the EBL Flash ECM, and then the EBL P4 and EBL SFI-6 ECMs. In closing a universal section on setting up the WUD Preferences dialog is shown.

EBL Flash:

The end cover of the EBL Flash ECM has a opening with a rubber grommet. This is used to pass the device wires through to the terminal strip. Can see the round opening with the terminal strip right behind it here:

And the terminal stripe, note the 7 - 0 markings on the front of the board. They are the ADC Channel number for the WUD ADC Channels dialog:

The left most terminal labeled 'S' is a serial output. It is 0 - 5 volts and is inverted from the normal serial data polarity. The three terminals marked 'GND' are grounds. They can be used as a light-weight ground source for devices. Using it for a g-meter is OK. Do not use them for something like a WB heater ground (current is too high).

Click here for setting up the What's Up Display.

P4 & SFI-6 Flash:

The EBL P4 and SFI-6 ECMs do not provide direct access to the ADC terminal strip inside of the ECM. There are several methods that can be used to get the wires into the ECM. Most of how this is done is dependent upon how the ECM is installed into the vehicle.

Note the 7 - 0 markings on the front of the board. They are the ADC Channel number for the WUD ADC Channels dialog:

The two terminals on the left labeled 'GND' should not be used. They are also going away. The reason is that the path is through the EBL P4/SFI-6 PCB and then through the MEMCAL socket. This can affect the operation of the EBL board.

Here is what one enterprising EBL user did. A small hole in the end of the ECM with a grommet. The WB output wire is fed through the grommet and connected to the terminal strip:

We did this for one particular installation. Similar to above but on the top of the case with a larger opening:

Another approach is to use a set of DB-9 connectors. Can mount one to the case, or leave it free hanging from an opening as show above. Wire all eight channels to it to make it easy to add devices, along with making it easy to R&R the ECM. Shown here are both crimp style and solder cup style. Don't forget the plastic hood (not shown):

For the ultimate install, can run wires from the terminal strip to available pins on the ECM harness connectors. There are enough unused pins on the EBL SFI-6 ECM for all eight channels. The EBL P4 ECM has enough unused pins for only five channels. These will be listed a little further down. The devices can then be wired directly into the ECM harness connectors. Here is how it is done, wires on the terminal strip:

The wires fed as two bunches around a component and under the heat sink. Note the sleeving to protect the wires:

The wires dressed upward and around the raised pads on the connectors. The raised pads are right up against the case, so the wires need to be lower then the pads:

The wires then soldered to the available connector pins:

Clear finger nail polish was used to glue the wires in place. Super-glue is also good for this. Be sure to keep the wires off of protruding pins from the other components. They can eventually cut through the insulation and cause problems.

For the above example here are the harness connector pins used (EBL SFI6 only):


For the EBL P4 ECM, here are the available pins:

E1, E2, B2, C2, & C14

If the '7730 ECM is used (not the '7749), there are additional pins. These have traces on them but are open ended. This may cause them to pick up electrical noise. But if using a low impedance source this won't be an issue. Those pins:

C10, C13, & C15

That will allow all eight ADC Channels to be brought out to the ECM harness connectors.

WUD Set Up for the ADC Channel Inputs:

In the What's Up Display (WUD), open the Preferences dialog (ALT+F, F):

Click on the ADC Channels tab for the set up dialog. Then click on the drop down for the channel of interest. In this case we have the TT-1 WB unit on channel 0, and a fuel pressure sensor on channel 1:

All set up, just need to click OK:

Note the two Preferred buttons being depressed. The one for the WB has that channel being used for WB VE Learns, and to place the WB reported AFR on the main and the trip displays. The one for the Fuel has that data placed on the main display.

They also get there own columns to present that data in the analysis of the log files via the WUD.

Fuel pressure sensors easily pickup the pressure fluctuations of the injectors opening & closing, along with the pulses from a positive displacement fuel pump. Setting the filter for that channel to 30% helps to smooth the data. It is also helpful to use a small (.032") orifice in a fitting that feeds the fuel pressure sensor as a mechanical filter.

If the drop down menu for the Device doesn't have the one you need, can make a User Device. Once created it will be added to the drop down menu selections. There is a tutorial on how to create User Devices in the What's Up Display Help document supplied with the EBL systems (it is easy).

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