Using a J3 Chip you can unlock many transmission shift parameters on your 6 cylinder EB-AU Falcon, or V8 AU Falcon. Through the chip you can edit shift firmness (line pressure), gear change RPM, and even torque convertor lock up. All changes are referenced by TPS and the Power/Econ switch, so you can make the auto shift firmly above 75% throttle and retain soft shifts for driving around town – much better than a traditional shift kit!
Shift Firmness (Line Pressure)
Adjusting line pressure is the most significant change you can make to improve shift quality and firmness. Power modifications that increase engine torque cause extra slipping in the clutches within the auto, increasing transmission wear, generating more heat and losing performance. Using a J3 you can prevent this wear and get the auto shifting firmer.
Traditional shift kits (resistor shift kits or adjustable line pressure solenoids) cause a constant raise in line pressure. This leads to rough shifts off throttle, and can even damage driveline components. With a J3 the Line Pressure adjustment is referenced by Throttle % (columns) and RPM (rows), so adjustments can be made in line with where power is being made, ensuring off-throttle shifting remains smooth.
We find factory shifts a little soft at mild throttle positions, so suggest starting with a +10 offset for all throttle positions above 40%. Increase the line pressure by larger amounts where you are making more power than standard – increases of 20-30 at the WOT shift RPM are normal for N/A applications, and up to 100 is expected for high boost applications. As an example, the below table is from our Supercharged EF Falcon and provides a nice firm shift but no wheelspin – ideal for getting the power to the ground.
Gear Shifts & Torque Convertor Lockup
We will update this guide to cover additional topics based on your feedback and as time permits! Leave a comment if you have any questions for us.