TCU tuning
Mercedes 722.6 TCU tuning: EGS52 and EGS53
The Mercedes-Benz 722.6 five-speed automatic can be tuned through its Siemens EGS52 or EGS53 control unit. The calibration is written by hand from your own read: shift times and pressures raised for a tuned engine, scheduling moved, delays removed and a manual mode that holds the gear.
Supported
What is covered.
| Gearbox | Variants | Control unit | Fitted to | How it is read |
|---|---|---|---|---|
| Mercedes 722.6 | 722.6 five-speed | Siemens EGS52, EGS53 | Mercedes-Benz five-speed automatics | On the bench in BDM mode, with KTAG or a similar tool. |
Calibrated by hand
Tuned to how you want it to shift.
Every TCU file is written by the tuner from your own read. Tell us how the car should feel, and anything in this list, or anything else you ask for, is set to match.
Shift times
Quicker, firmer changes, or smoother ones if that is what the car is for.
Shift pressures
Clutch pressures raised to match the torque the engine now makes, so the gearbox holds it instead of slipping.
Shift scheduling
When it changes up and down, in every mode, moved to suit the engine and how you drive.
Torque limits
The internal TCU torque limits removed, so a tuned engine is not cut back by the gearbox.
Unnecessary delays
The hesitation built into kickdown, downshifts and pulling away taken out.
True manual mode
In manual mode it holds the gear you chose and does not change up on its own at the limiter.
- At the moment the EGS52 and EGS53 are read on the bench in BDM mode, with KTAG or a similar tool, rather than over OBD.
- Upload the full BDM read. The tuned file is written back the same way.
Questions
Before you order.
Can the EGS52 or EGS53 be read over OBD?
Not at the moment. Both are read on the bench in BDM mode with KTAG or a similar tool. Upload that read when you order, and the tuned file is written back the same way.
What is the difference between the EGS52 and the EGS53?
They are two generations of the Siemens control unit that runs the 722.6 gearbox. We tune both, and the read tells us which one your car has.
Do I need a TCU tune if my ECU is remapped?
It is not required, even with a Stage 2 remap, but it is recommended whenever the ECU is tuned. The gearbox control unit has its own torque limits and shift pressures set for the standard engine. A TCU tune removes those limits and raises the pressures, so the gearbox holds the extra torque and shifts the way the car now needs to.
Can the gearbox be tuned on a car with a standard ECU?
Yes. A TCU tune does not need any change to the engine ECU. Plenty of people only want the gearbox to shift faster, hold gears in manual mode or lose the delays, and that is done entirely in the TCU.
Is the TCU file custom or off the shelf?
Custom. Every TCU file is calibrated by hand by the tuner, from your own read, to how you want your transmission to feel. Gearbox work is never automated and never delivered from a library. Say in the order what you want, such as firmer shifts, a comfortable daily or a true manual mode, and the calibration is written around it.
How do I order a TCU tune?
Read the TCU with your tool, then submit it through your account like any other file: pick your vehicle, upload the read and choose the gearbox solution. Describe how you want the transmission to behave in the order notes or the job thread, and the tuner will ask if anything is unclear. Creating an account is free, and every account is reviewed before it is activated.
What does a TCU tune cost?
The price is shown inside your account, in the price list and on the order form, because it is read live from the catalogue. Jobs are paid for with credits bought by card through Stripe.
Send us your TCU read.
Order it like any other file: pick your vehicle, upload the read and choose the gearbox solution.
Other gearboxes: ZF 8HP, ZF 6HP, GM 5L40E (GS20), VAG (DSG, S tronic), ZF 8HP in other makes