The J3 port is the direct memory access connector on the rear side of of the ecu. That way you are always prepared no matter what!!! Quarterhorses, 2 jaybirds, and 10 chips (thats how I roll). If you have multiple vehicles that you will beĬontinually making changes on then its ideal to own two quarterhorses so you do not have to remove it and burn a chip each time you begin tuning another vehicle. When you are done tuning your vehicle you simply write your final tune to an f3 chip and you can then use your quarterhorse to tune another vehicle. If you own multiple vehicles then be sure to order a Jaybird and a couple F3 chips from when ordering the QH. If you are only tuning one EEC then all you need is one quarterhorse. In either case the EEC-IV and EEC-V alternately accept moates J3 chips on the back of the ecu in lieu of realtime tuning which is not recommended when realtime tuning is available. It is recommended to replace the quarterhorse with a moates f3 chip after you have completed your final tune or remove the quarterhorse and flash you final tune to EEC-Vs using an OBD-II cable. Although it can stay in the vehicle indefinitely, it was not designed to do so. You to see what the computer see's!!!! The quarterhorse is an emulator which replaces the eeprom (ecu tune) with its own allowing realtime tuning. The Moates Quarterhorse is ideal for the DIY tuner/racer, not only does it allow you to tune your vehicle it is also a SIGNIFICANTLY HELPFUL diagnostics tool allowing Support realtime tuning via the use of a Moates QuarterHorse from CLICK HERE for the direct link. Unfortunately, only the 1983-2004 EEC-IV and EEC-V's equipped with a J3 port The best option is always REALTIME tuning. This goes without saying, before you can tune your ecu you must have hardware to physically plug in-to it. #1 - Hardware - to communicate with the ECU If you were directed here by decipha from your premium member thread jump down to the TunerPro RT Setup section. Getting Started / EFIDynoTuning How To: Getting Started
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