Big Turbo Tune: Audi TT (MK1 – 1.8T – AMU)

Tuning for almost any turbo larger than a K04 hybrid that can be supported with 550cc injectors.

SKU: MTZ_BT_TT_AMU Categories: , , , Tags: , ,


Big Turbo Remote Tuning: Audi TT (MK1 – 1.8T – AMU)

Starts at $789.00. Please complete a Big Turbo Quote Request Form

Model Years: 2000-2002 *Please contact us with questions about model years if outside the North American market.
This tune may be purchased for other narrowband TT225 and S3 engine codes such as AUQ, please use the contact us link above to inquire.

Talk to us about your power goals, your modifications, and we’ll help you get there.

Required Upgrades:
Injectors (Bosch 550cc)
Upgraded Diverter Valve
Upgraded Turbo
High-Flow CAT
Recommended Upgrades:
3″ or larger MAF Housing
Upgraded Rods
Power Gains:
300-400hp / 300-400lb-ft without wideband conversion


Power gains will vary based on modifications, fuel type, and testing conditions.

  • Model years may shift for some European and ROW markets.
  • Injectors MUST come from a reputable source. See below for more information.
  • For customers planning to run E85, we suggest at least 750cc injectors and upgraded rods.
  • Please feel free to contact support if you have questions prior to submitting a quote request.
  • If planning to do a wideband conversion, more options are available. Information is for unconverted narrowband ECUs.

Remote Tuning Kit Includes:

  • Selected ECU Software Upgrade
  • Motoza MX-USB Interface
  • MotozaPS for the PC
  • Free Motoza Member account, which lets you store, upload, and download data logs and tuning files online.

Unless prior arrangements are made, log reviews must be used within 6 months of initial set up. Hardware changes made after initial set up may incur a fee.

Tune is a virtual product that will be uploaded to your account. Box images are representational only. Your tuning cable will be shipped.


  • Flashed DIRECTLY to the ECU with remote tuning kit (included FREE)
  • Flash your tune in your own garage, no need for a dealer
  • Extensively tested and proven to provide superior performance
  • Increased power and torque
  • Optimized for responsiveness, drivability and smooth operation
  • Rev-limiter raised
  • Speed restrictions removed
  • Easily upgrade your tune at a later time without penalty
  • Upgrade to Bluetooth (BTX) interface available
  • Upgrade to 2 map MTC (Multi-Tune Control) available

Modification Options

The narrowband ECU found in the AMU limits injector choice but can handle several GT28 series or similarly sized turbos comfortably.


We still need your injectors to come from a reputable source. The ECU doesn’t have the resolution to handle large injectors well. If your goals require injectors larger than 550cc we suggest a wideband conversion. You’ll also benefit from real time fuel correction with a wideband conversion. E85 can be used with 550cc injectors and we suggest it if you plan to stay narrowband. 4bar fuel pressure regulators are supported, and usually a good idea for built blocks.

MAF/MAF Housing

The stock MAF will be sufficient, but we can accommodate the B5 S4 Bosch housing.

Diverter Valve

Diverter valve can be piston style, full recirculating or hybrid, but no BOVs. The Bosch 710N diverter valve is another good choice for Stage 1 and 1+.

Other Modifications

No limitations on intercoolers, intakes, or fuel pumps, all exhausts supported, though some may throw a CEL that will not affect performance. For upgraded intakes, please use a dry filter. If using an oiled filter, regular MAF cleaning will be needed. 3bar MAP sensors are not supported.


Injector Policy

Injectors are the heart of your build. They need to be genuine Bosch or properly modified with a detailed flow report. Injectors must come from a reputable source, there are too many counterfeit and subpar rebuilds that do not flow as advertised, may damage your engine, they waste time and money and we will not support them. This site is, of course, a reputable source, but there are others and we will gladly share that list via email. It even includes other tuning companies; we’d rather you buy genuine injectors from another tuner than purchase cheap, ineffective, or knock-off injectors. Injectors purchased on auction and third party sites that ship in boxes with smiles on them are not worth your money & time. In short, if you are looking for places to save money on your project, injectors are not the place to do it. 

We expect that cars will fuel differently based on age and condition, however, all of the injectors supported by this tune have a normal range of variance. If your injectors are not within this range you may be required to replace them or flow test them at your expense.

What You’ll Need

A Windows 8, 10, or 11 laptop with a USB-A port. Chrome OS and MacOS are not supported, but software requirements are minimal; if your computer meets the minimum requirements for your version of Windows you’re good to go.

You’ll need an internet connection to download and upload files but not for flashing and logging.

Why Motoza?

More than just an off the shelf file, our logging process allows your tune to be optimized for your car and your modifications.  You’ll work with real people who value you and your car. Our tuners can often spot common mechanical issues that prevent you from getting the most out of your build and are happy to assist you as your car progresses. For a decade our commitment to personalized service and the mechanical engineering backgrounds of our staff sets us apart. Whether you’re new to modification or have modded every vehicle you’ve owned, we’re here to support your power goals.

While we do insist on quality injectors and OEM or OE sensors from trusted suppliers, we support most aftermarket parts giving you the flexibility to choose the hardware that’s right for you.  Our power numbers represent an average based on third party testing, not ideal conditions on our own dyno. Well maintained cars can outperform estimates. Let’s face it, 15+ year old cars need a little special attention to perform their best and while you may be good to go on the first file you’ll have the peace of mind knowing that our staff is there to ensure that your car is responding well to increased power levels and then further dial it in to ensure maximum performance.

With no additional fees for flashing hardware you’ll have the ability to tune your car from the comfort of home or you can work with one of our trusted dealers but still have support when your car leaves the shop.  We offer affordable reworks if you need to add new hardware but are not ready to change stages and additional log reviews can be purchased outside the tuning window if you need diagnostic assistance.


Motoza Performance products are intended for motorsports competition on closed courses where permissible. Purchase constitutes acceptance of the terms and conditions. Products are not for sale or use in the state of California or other jurisdictions where sale or use is prohibited. Unless specifically noted, products are not intended for use on registered or emissions controlled vehicles. By checking out, you understand and agree that use on public roads in the United States is illegal. Motoza Performance, its parent companies and/or subsidiaries make no claim, representation, or warranty that products comply with, or are designed to comply with, any emission standard. Purchaser acknowledges and agrees that it is their sole responsibility to inform themselves of applicable laws governing the use of automotive performance products for their application and circumstances. Additional digital signatures and verification may be required for some products and services.