This is the primary AEMnet CANBUS plug that goes to the CD-5 dash.
The harness main plug positively locks into the back of the CD-5 to fully populate all of the back plugs of the dash unit.
Other AEMnet devices like this X-Series wideband air/fuel ratio gauge P/N 30-0300 can daisy chain for data logging to the CD-5 via the second CAN plug on the harness. This is super handy for tuning! If you want to monitor or log more devices, AEM has several different accessory expansion modules with varying amounts of channels you can use to add more. AEM also has a 4 port AEMnet CAN hub P/N 30-2255 that allows 4 AEMnet devices to daisy chain into the CD-5 CAN plug. Two hubs can be daisy-chained together to allow 6 devices to be daisy-chained int total!
Adding the X-Series wideband to the CD-5 is just a matter of plugging it in!
Using the CD-5 for dyno testing is just one of many situations our portable data logging unit has come in handy. Late model cars have ECU’s with very active self-learning with a lot of command authority. It is very difficult to get consistent dyno results out of them. We have found that you need to start your dyno pulls at the same water temp, and intake air temp and keep track of the oil temp and don’t let that climb to high to get consistent results. The ECU’s long and short term trims need to be monitored as a sanity check as that is often an indicator that things are not going right. When testing parts, like we were doing when testing the Vektor Performance headers on this 991 911 monitoring is very critical, especially because Porsche ECU’s are super active. If you do not take care, run to run and day to day variance can exceed the gains or losses of the part being tested. Since tests of a part may occur days after the original baseline run, having data logging makes a great reference to see snapshots of the state of things during the baseline testing.