What is the ATS 42-RLE Co-Pilot’
The Co-Pilot consists of a controller and wiring harness. The harness plugs into the TCM connector on the main computer located in the engine compartment. The harness is completely plug and play for easy installation. The controller mounts in the cab and allows the driver to view critical transmission and engine inputs such as line pressure and commanded engine load. To view the different sensor inputs all you do is depress the up or down arrows. These changes can be made on-the-fly or with the vehicle stopped.
What Does the ATS 42-RLE Co-Pilot Do’
The Co-Pilot controls line pressure, clutch timing and more aggressively applies the converter clutch under high torque situations. Line pressure is limited in a stock 42-RLE to 90 PSI. Unfortunately, this is not high enough to reliably prevent clutch slippage at higher power levels. The Co-Pilot senses throttle position to quickly take control of line pressure when it is needed. However, when the vehicle is driven lightly, line pressure is near stock for comfortable shifts and lower transmission temperatures. This is all done automatically in the controller.
Line pressure is increased more dramatically and lubrication pressure is increased with the addition of an ATS Valve Body. While the ATS valve body installation isn’t necessary, it will increase the performance of the Co-Pilot to its fullest potential. We recommend installing one of the ATS Diesel modified valve bodies to fully address all of the internal hydraulic issues with the stock 42-RLE valve body.
The Co-Pilot has a huge advantage over TCM programing on 2007 to 2011 Jeeps because of the way the factory TCM is designed. We have found when aftermarket tuning for higher line pressures are done to the ECM/TCM to command higher line pressure in the transmission many if not all aftermarket TCM tuning will cause a radical pressure variation that spikes line pressure causing lots of problems. For this reason, you will find TCM tuning is not desired on the 3.8L and when TCM tuning is used many tuners do not allow for full line pressure increases like the Co-Pilot does, the Co-Pilot utilizing its dynamic closed loop control addresses this with an averaging circuit that provides a very smooth and controllable line pressure rise up to 155PSI. Clutch timing is programmed into the Co-Pilot to increase clutch pack life. On any 42-RLE transmission, clutch timing is optimized to reduce wear on clutch packs, efficiently transfer power and increase reliability.
The torque converter lock-up apply on a stock 42-RLE leaves a lot to be desired. The factory TCM will command lock-up at a very low apply rate when at light throttle, this causes a slipping condition that damages the converter clutch especially when behind a modified engine or when running over sized tires. The ATS 42-RLE Co-Pilot will more firmly lock the converter clutch during apply, this allows the inherent torque of the 3.8L engine to be used for better efficiency and performance.