Official JHM 4.0T ECU and TCU Tuning Thread
NOTE: Our ECU/TCU Combos include all stages and octane options. No need to purchase separately.

NOTE: Our ECU/TCU Combos include all stages and octane options. No need to purchase separately.

JHM C7 S6-S7 and D4-A8 4.0T ECU and TCU Software:
Experience the ultimate in performance with our cutting-edge software for the 4.0T engine. Our team of engineers has spent years refining and perfecting our software, ensuring that you get optimal performance without any guesswork.
With our one-cable flashing suite for both ECU and TCU, you'll get the most out of your vehicle's potential. Our transmission tune is optimized with a 2000 to 2500 rpm launch control (DSG), ensuring that you get consistent launches without tire spin on street tires and stock turbos. We've performed hundreds of test passes to ensure that our launch assist range is ideal for street tires while still keeping your rear axles intact.
This is a one-and-done solution that only requires a single flashing cable (JHM Power-Connect) and can be easily flashed in the comfort of your own home with an internet connection. And the best part? Upgrading to Stage 2 and 3 is absolutely free!
Our ECU and TCU combination is specifically designed to work together, providing you with a range of benefits that include increased engine rev limits, more aggressive throttle control, faster shifting speeds, and higher clutch clamping loads. Our software also offers a more assertive shifting experience in Sport mode and after launching, as well as a variable launch RPM for more aggressive and consistent launches.
We've also fine-tuned our software for refined drive and normal driving shifting dynamics, decreased transmission wear, raised torque limiters, and a more aggressive torque curve. Our software offers maximum boost for each gear with faster spool, safe EGT management for stock catalyst protection, and a larger range of fuel and ignition adaptation for even more power.
We've even adjusted our ESP and traction control to eliminate micro braking due to tire spin, helping to prevent axle breakage when launching. Experience the best in performance with our state-of-the-art software for the C7 S6, S7, and D4 A8 4.0T.
By making an ECU and TCU combination that works together we were able to do the following for your C7 S6 S7 and D4 A8 4.0T
Engine Rev limit increased to 7200 rpm
More aggressive throttle control
Increased shifting speeds
Faster Clutch Clamping with Higher Clamp Loads
More assertive shifting in Sport mode and after launching
Variable Launch RPM
More aggressive and consistent Launch
Refined Drive and normal driving shifting dynamics
Decreased Transmission wear due to less slipping from faster shifting
Raised TQ limiters
More Agressive Torque Curve
Maximum Boost for each gear with faster spool
Safe EGT Management for Stock Catalyst Protection keeping your car as safe as possible while maximizing performance - Stage 1
Larger Range of Fuel Adaptation for More Power from Better Fuel
Larger Range of Ignition Adaption
ESP / traction control adjusted to eliminate micro braking due to tire spin (Helps prevent axle breakage when launching)
BONE STOCK with JHM ECU/TCU Software, JHM FUEL LINES - Stage 1 E40 - 2013 A8L

CLICK HERE for more information or to purchase software.
CLICK HERE FOR STAGE 3/RS7 Turbo Software
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