About the QuarterHorse
The QuarterHorse delivers in unparalleled fashion. It plugs into the J3 port like a chip, but can do much more. The QH hardware is compatible with all EEC-IV and EEC-V ECMs through 2004 equipped with a J3 port, allowing realtime tuning AND datalogging while the vehicle is operating. In order to realize the capabilities of the QH hardware, each ECM must have specific software support – there is no such thing as “universal software” for the QH. Using the QH and appropriate software, you can change ANY parameter while the vehicle is running without disturbing operation. On fully-supported applications, you can log any parameter at sample rates well over 100 frames per second using only the QH hardware without any additional datalogger required. (On a practical level, the speed of most software/PCs limits this to about 20 frames/second of data.) The combination of on-the-fly tuning and rapid, accurate data logging makes it possible to tune engine combinations that would have been impossible to do prior to its introduction. This device continues the tradition and heritage of our highly-integrated, low-cost, high-quality tuning tools from GM and Honda into the Ford arena.
Software support is critical for the QH. In order to realize its full potential, extensive software features need to be implemented. The locations and format of parameters available to change need to be mapped out. The locations and formulas used by the ECM for storing data need to be identified. To make things even more complicated, some parameters are stored in memory that the QH cannot access in many factory ROMs – additional “patch code” needs to be written for each strategy to allow all parameters to be logged. This patch code is integrated into the datalogging definitions in most software and is part of the reason why each strategy requires individual attention. As of 7/31/14, it is supported by Paul Booth’s EEC Editor, Clint Garrity’s Binary Editor, and Mark Mansur’s TunerPro version 5 which each support different vehicles. There is a basic list of which ECMs are supported that you can check, but it isn’t always up to date. Your best bet is to look at this page and contact us with information about your ECM. Bottom line: Please check with us before buying any hardware to make sure your vehicle is supported!
The QuarterHorse does have limited support (4x) for remote switching via rotary knob for EEC-IV applications (available separately, search this site for ‘QH Switch’) as well as software-based program selection from PC (8x 1-bank, 4x 2-bank, 2x 4-bank). Firmware revision 1.6 adds the ability to ‘harvest’ stock binaries from a computer that is externally powered. (i.e. you cannot do reads on the bench without a 12V power supply) Although QH provides unmatched features, it has limits. It is “just” an emulator and datalogger. You are still working with factory ECMs. Any limitations of the factory ECM that would be present with a chip will be present with the QH. An example of this is that an A9L Fox body MAF computer cannot convert over to use a MAP sensor or run Coil-On-Plug simply by adding a QH. It’s cool, but not magic.
While the QH has a battery to retain your tune after the engine is turned off and your laptop is disconnected, we do NOT recommend that the QuarterHorse be left on vehicles permanently except in the case where tuning changes continue to be made on regular and ongoing basis. The QH has a battery with a finite life and it will eventually die. Its death will happen much faster if the QH sits idle than if it is being regularly used: the QH was always intended to be used as a tool for active interaction with the vehicle, not as a chip for delivering a static, unchanging tune. (Read more) If you do not have a laptop with the software necessary to make changes, you probably shouldn’t be using a QH: one of our chip products would be a much better choice for someone who isn’t tuning their car themselves.
The standard QH package comes with all the hardware and cables needed: the QH device itself, a USB 2.0 mini-to-regular USB bulkhead cable, cable mounting bracket and bolt, standard USB 2.0 cable, and 2x snap-on ferrite beads. Software is sold separately (check our ‘Tuning Software’ section).
It is critical that the vehicle is fully off before installing or removing the QH on the J3 port. Failure to power-off the ECM correctly can result in frying our hardware, your ECM or both!!! If you have any doubts at all, remove the keys from the ignition 100% or disconnect the battery. WARNING WARNING WARNING!
Articles on Using the QH
- The new version of Binary Editor 2010 requires QH firmware 1.6 or higher.Most firmware upgrades are bugfixes of one variety or another. If you aren’t having trouble, chances are the bugs do not affect you.
- Most bugs affected the QH when operating in modes 3 and 4 (EECV)
- The latest firmware revision as of 2/11/10 (version 1.6) allows you to read the stock program from an ECM using the QuarterHorse.
Program Switching with QuarterHorse
Now, hold the modified 4 (now 3) pin connector in place as shown, re-heating the solder so that the two pieces can be bonded together in the correct position.
Here is what the completed switch / QH / knob assembly should look like:
This is a pretty simple installation. It basically overrides the BS0/BS3 lines (if you’re familiar with this terminology) at the EEC connector. Therefore, to repeat, this is NOT to be used on EEC-V applications.
NOTE: The QuarterHorse must be configured to use MODE 1 or the switch will NOT WORK. As of the time of writing (Apr 2011) Binary Editor is the only software that supports Mode switching which means it is also the ONLY software that will currently work with the switcher module.