Project Con Artist Part 8 - Total Control

We recently came across a trick new product for Wrangler JKs that we just had to try out on Project 'Con Artist. The EHT-300 from Off Road Engineering is a neat little device that finally gives us a way to control the electronic throttle on our manual-transmission-equipped Wrangler.

The Wrangler JK utilizes a new electrical architecture known as CANbus, which links all of the component subsystem computers of the vehicle together to share information. Since CANbus utilizes drive-by-wire technology, the gas pedal is no longer directly linked to the engine, eliminating the ability to have a mechanical remote idle control. Add this to the fact that the JK has such a low idle speed and it can be problematic for some of our favorite aftermarket accessories, such as our Kilby compressor, which is much more efficient at 1,500 rpm than at 700 rpm.

Enter Off Road Engineering, LLC, which has been around since 1999 designing high-idle and throttle-control systems for Jeep TJs, as well as commercial applications, such as emergency vehicles, limos, buses, tow trucks, and any other applications that have a need for a faster idle to power high-draw accessories.

For the JK, they offer the EHT-300, which is designed to interface with the drive-by-wire technology. It is a plug-and-play unit that plugs into the factory wiring harness with OEM-style connectors, and allows the driver to control the vehicle rpm via a control box. You can even power the EHT-300 up to a preset, user-adjustable rpm level by adding an optional dash switch.

We met with Robert Muertter, President of Off Road Engineering, LLC, at Off Road Evolution in Fullerton, California, for this quick and easy install.

With the EHT-300 installed, we no longer have to wait between tires for the air compressor to refill the tank or for a buddy to sit in the driver seat to keep the revs up. Above and beyond helping the compressor to refill the tank faster, we have found the EHT-300 to be useful while crawling over obstacles in low range and giving the throttle an extra boost to prevent stalling, just like a traditional hand throttle would. Setting a higher throttle also aides in winching by allowing the alternator to supply sufficient current during the winching operation. We imagine welding operations would also benefit in the same way, preventing battery drainage. The EHT-300 is also compatible with automatic-transmission-equipped JKs.

The EHT-300 comes with two...        read full caption The EHT-300 comes with two pieces, the control module and the hand-held remote. It is controlled by two simple switches; one for power, and one for rpm. The light on the box indicates that your EHT is providing you manual control over engine rpm. To return to computer control, simply turn off the power switch to the control box.	We added on the optional high-idle...        read full caption We added on the optional high-idle switch to our installation, which activates a preset rpm with one-touch ease.	With the battery disconnected,...        read full caption With the battery disconnected, the stock wiring harness was located under the dash, near the accelerator pedal and was unplugged.
Next, the control box was...        read full caption Next, the control box was mounted near the accelerator pedal and plugged into the factory harness.	The hand-held remote harness...        read full caption The hand-held remote harness was then plugged in to the control box and power was tapped from behind the Power Point on the dash.	Before mounting the box to...        read full caption Before mounting the box to the dash, the battery was reconnected and the EHT-300 was tested.
The EHT-300 can be set for...        read full caption The EHT-300 can be set for a no-load idle up to 3,000 rpm.	With the unit working as designed,...        read full caption With the unit working as designed, we found a spot on the dash for our high-idle preset switch and drilled a hole.	Now the high-idle preset switch...        read full caption Now the high-idle preset switch is mounted with the rest of our accessory switches on the lower dash.
After buttoning up the installation...        read full caption After buttoning up the installation and setting our preset idle, we used Velcro to attach the idle selection box to the side of the center stack so it is at our fingertips when we need it.