| Manufacturer | Weistec |
| Street legal in all the US States | No |
| Transmission Family | ZF 8HP |
| Tuning Method | Cypher Plus |
| Module Type | TCU |
| year | make | model | trim | engine |
|---|---|---|---|---|
| 2026 | Audi | Q7 | 55 Quattro (4M) | Turbo 3L V6 (EA839) |
| 2025 | Audi | Q7 | 55 Quattro (4M) | Turbo 3L V6 (EA839) |
| 2024 | Audi | Q7 | 55 Quattro (4M) | Turbo 3L V6 (EA839) |
| 2023 | Audi | Q7 | 55 Quattro (4M) | Turbo 3L V6 (EA839) |
| 2022 | Audi | Q7 | 55 Quattro (4M) | Turbo 3L V6 (EA839) |
| 2021 | Audi | Q7 | 55 Quattro (4M) | Turbo 3L V6 (EA839) |
| See more | ||||
Product Description
The ZF 8HP is, by wide consensus, the benchmark torque-converter automatic of the modern era, and once you understand the engineering it's easy to see why. It debuted on the BMW 760Li with a genuinely clever gearset that produces eight ratios from just four planetary sets and five shift elements, only two of which are ever open at once. That compact, efficient layout lets it shift quickly enough to trade blows with dual-clutch transmissions. Its reputation grew so fast that it spread well beyond BMW, and Audi has fitted various generations of it across a wide swath of its longitudinal-engine lineup.
Weistec's TCU tune for the Audi application recalibrates that factory 8HP software. The mission is to draw even more out of hardware that's already regarded as class-leading, with the same validation rigor ZF and Audi put into the original calibration, while leaving the factory's clutch-protection and thermal-management logic fully in place. (Worth confirming your specific Audi is fitted with the 8-speed ZF automatic and not the alternate 7-speed dual-clutch some variants offer, since this tune is built for the former.) The result takes an already best-in-class transmission to another level.
Related Items
How Do You Get Your Audi ZF 8HP TCU Tune Tuned?
Follow these steps — this is what your specific vehicle needs and supports.
2
Choose Your Tune Stage
3
Core Improvements
Standard with this tune4
Free Add Ons
5
See the full tuning process →
Pick Your Tuning Method
1Selected
Cypher Plus
Order a Cypher Plus and tune your car yourself from your phone, entirely through the MyFlasher app. Watch how it works.
2Selected — Pick return shipping at checkout
Mail It In
Remove your ECU or TCU and mail it to us for tuning. Required for some applications.
3Selected — Pick Will call at checkout
In Person
Bring your vehicle, or just your ECU/TCU, to our Anaheim, CA headquarters. Call 714-202-0005 or email sales@weistec.com to schedule.
4Selected — Order through your local dealer
Cypher Pro Dealer
Visit a certified Cypher Pro Dealer near you. Find one with our dealer locator.
6
Complete The Upgrade
An ECU tune alone won't remove all factory limits or fix how power reaches the ground. Add these to round out the upgrade with no limitations.
Read the full CPC & TCU breakdown →
What is a CPC module?
The CPC (Central Powertrain Control) is a separate control unit that manages things like the active exhaust valves, radiator fan, intercooler pumps, and speed limiter. On many newer Mercedes-Benz vehicles, it also houses torque limiters that can hold back an ECU tune from reaching its full potential.
What is a TCU tune?
A TCU (transmission control unit) tune delivers faster, firmer shifts with higher line pressure, reducing clutch slip and increasing the transmission's torque capacity. It's a worthwhile upgrade on its own, or paired with an ECU tune for a fully sorted powertrain.
Your Total
Good to Know
- This is a reflash of your original module, not a stand-alone unit.
- Power gains vary by vehicle, modifications, fuel, and operating conditions (ambient temperature, altitude, etc.).
- New or upgraded spark plugs are always recommended when tuning.
- Product may not be emissions compliant. Check local laws prior to installation.
- Always use a battery charger during programming.
Fitment not confirmed
This part is not confirmed to fit your selected vehicle.