Originally Posted by Benny

The temp sensor adapter is actually very important in tuning the RX-8. As some of you may know, even during wide open throttle up to mid range RPM, the RX-8 ECU is still running in closed loop operation. During closed loop operation the ECU will continually be making adjustments to reach its target air fuel ratio, which is way too lean for a turbo kit. Also the A/F sensor technology is new and advanced on this vehicle so it reacts extrememly well to rich/lean conditions to get to its target A/F, which is generally stoich (14.7 to 1). Well, with the stock ECU making adjustment around mid range RPMs, tuning the Emanage was pointless because the A/F would change and get leaner. Also I must add that the intercept point (peak boost) for this is in the range, so it is manditory that the A/F ratios are safe and adjustable at this point. We used the VTEC switch on the emanage to enable the temp sensor adapter when any positive pressure was detected from the GReddy Pressure sensor. This switch causes the ECU to think it is colder and run in open loop operation so we can make any adjustments we want without the stock ECU making adjustments to lean it out. I am sure MZM can tune it to make it run beatiful. They will call me if they have questions.

Originally Posted by adrian-1

Benny from Greddy has said the dongle is important and shouldn't be removed. Here's his reply on what it does and why it's needed is below.

Also, if you only have 2 dongles, check his thread on how to get the 3rd dongle to get rid of the CEL. Even if you have 3 dongles and bought before June 1st, you will also probably need to be updated. The kits sold after June 1st have the updated dongle.