2015 - 2021 Audi S3 2.0T EA888.3 ECU TUNE
Audi S3 8V ECU Tune
Real Numbers. Real Dyno.
Tap a stage for its numbers. The chart shows our filmed pulls — stock, Stage 2, and Stage 2+ E85. Every stage joins the chart as its pull is filmed.
Stage 3 Turbo Options — Wheel Numbers on 93
| Turbo | Peak WHP | Peak WTQ | Fuel Hardware |
|---|---|---|---|
| CTS IS38 Hybrid | 408 | 365–385 | HPFP upgrade |
| Turbo Concepts Stage 3 | 465 | 400–420 | HPFP + LPFP + MPI 980cc injectors |
| APR DTR | 430 | 400 | HPFP + LPFP + MPI |
GT22 Garrett builds are also calibrated — running a different turbo? Contact BDT before purchase. Stage 3 includes LPFP/HPFP recalibration and a boost gauge calibrated for the new turbo.
If your tuner doesn't show before & after dyno videos, you're being lied to.
A dynamometer is a before-and-after measuring tool — not an absolute output number. Stage 2 and Stage 2+ E85 above are real pulls on our rollers against the same car's stock baseline. Every number on this page comes from the same dyno program — full graphs post as each pull is filmed.
How It Works — Flash It Yourself
No appointments. No screen-share. The free BDT Flasher app puts the tune in your driveway — plug in, pick your map, hit Flash. Your S3 sounds different in 20 minutes.
Download — grab the free BDT Flasher. One-click Windows installer, 30 seconds.
Plug In — Tactrix Openport 2.0 OBDII cable from your laptop to the port under the dash.
Sign In — your purchased tunes show up automatically. Pick your map.
Send It — hit Flash. 15–20 minutes, then pull out of the driveway.
Existing BDT customer? Text (843) 891-6687 and we'll load your tune into the flasher.
What's Included
Watch The Proof
Dyno pulls and every feature, on video. Sound on.
Stage 2 — Live Dyno (Audi S3)
Stage 3 — Live Dyno Pull
Park Crackles — S3
Intense Crackle Pops — S3
Driving Crackles Demo
Multi-Map + RAL Live
True Flex Fuel Demo
Map Switching Demo
What Your Car Needs, Per Stage
If it is not listed as required, the tune runs without it.
| Part / Upgrade | S1 | S2 | S2+ E85 | S3 |
|---|---|---|---|---|
| Turbo Upgrade | — | — | — | REQ |
| High-Flow Exhaust | — | REQ | REQ | REQ |
| True Flex Fuel Sensor | — | — | REQ | — |
| TCU Tune DSG — required from Stage 2 up | REC | REQ | REQ | REQ |
| HPFP Upgrade (Autotech) | — | — | REQ | REQ |
| LPFP Upgrade Stage 3 — scales with turbo choice* | — | — | — | REQ |
| MPI 980cc Injectors (CTS) Stage 3 — scales with turbo choice* | — | — | — | REQ |
| Intercooler | REC | REC | REC | REQ |
| Air Intake | REC | REC | REC | REQ |
| Drivetrain Reinforcement | — | REC | REC | REQ |
*Stage 3 fuel hardware scales with turbo choice — CTS hybrid builds require the HPFP upgrade only; Turbo Concepts builds require HPFP + LPFP + MPI 980cc; APR DTR builds require HPFP + LPFP + MPI.
Multi-Map Layout — All Power Stages
Switch maps on the fly with the cruise control buttons — daily to race to valet in seconds.
Maintenance
| Maintenance Item | Interval |
|---|---|
| SPARK PLUGS NGK Racing Plugs — ngk.com/ngk-4905-r7438-8-racing-plug | 15–20K mi |
| OIL CHANGE 5W-40 Liqui Moly • OIL FILTER = OEM ONLY | 5K mi |
| REAR HALDEX FLUID (Quattro) | 30K mi |
| TRANSMISSION FLUSH / FILTER OEM only | 30K mi |
| MAP SENSORS OEM only • Intake / before throttle body | 80K mi |
| PCV ASSEMBLY | 80K mi |
| INJECTORS + CARBON CLEANING Do them on time to avoid misfires, lean conditions, and long-term damage. | 85K mi |
Late Policy: If you schedule an in-person flash and arrive late without notice, a $50 fee applies. Reschedules must be made at least 1 hour prior.
EMISSIONS COMPLIANCE NOTICE & LEGAL DISCLAIMER
FOR COMPETITION USE ONLY — NOT FOR STREET USE
This product is sold and intended solely for vehicles used in closed-course racing, off-road competition, or organized motorsport events. It is not legal for use on any pollution-controlled vehicle operated on public roads or highways, as defined under the Clean Air Act (42 U.S.C. § 7522) and applicable state emissions laws.
By purchasing, installing, or using this product, you explicitly acknowledge and agree to the following terms:
Federal and State Emissions Compliance
- This product may modify, bypass, defeat, or render inoperative one or more emissions control devices, including but not limited to: catalytic converters, oxygen sensors, EGR systems, or OBD monitoring systems.
- The installation or use of this product on any vehicle subject to emissions regulations is strictly prohibited by federal law and may result in civil or criminal penalties, including fines up to $45,000 per vehicle under the Clean Air Act.
- This product is not certified by the EPA or CARB, and is therefore not legal for sale or use in California or any CARB-adopting state.
Assumption of Risk and Waiver of Liability
By purchasing and/or installing this product, you agree to:
- Assume all risk and responsibility for compliance with applicable local, state, and federal laws and regulations.
- Waive all claims, liabilities, and legal actions against Boost Dynamic Tuning, LLC, its officers, directors, employees, and affiliates arising from the purchase, installation, or use of this product in violation of any applicable law.
- Release Boost Dynamic Tuning, LLC from any and all damages, injuries, or penalties resulting from improper or unlawful use.
Indemnification Clause
You further agree to indemnify, defend, and hold harmless Boost Dynamic Tuning, LLC from any fines, penalties, damages, losses, or legal fees resulting from use of this product inconsistent with this disclaimer, misrepresentation of vehicle use, or violation of any emissions laws or regulations.
Final Notice
This product is sold "as is" and "with all faults", with no warranties, expressed or implied, regarding legality for public highway use or emissions compliance. It is the sole responsibility of the end-user to determine legality for the intended application. Boost Dynamic Tuning, LLC does not condone or recommend illegal street use or emissions equipment tampering.
By completing your purchase, you acknowledge that you have read, understood, and agreed to this disclaimer in full.
HIGH-FLOW EXHAUST NOTICE: BY PURCHASING A MOTORSPORT/RACING PRODUCT ("PRODUCT"), YOU REPRESENT THAT YOU UNDERSTAND AND AGREE THAT: THE PRODUCT IS NOT DESIGNED TO MEET ANY APPLICABLE EMISSIONS STANDARDS, WHETHER IN THE USA OR OTHERWISE, THE PRODUCT IS NOT DESIGNED TO BE C.A.R.B. COMPLIANT, AND THAT THE PRODUCT IS NOT FOR SALE OR USE IN CALIFORNIA, USA NOR ANY OTHER JURISDICTION WHERE THE SALE OR USE IS PROHIBITED BY LAW. BOOST DYNAMIC TUNING, LLC MAKES NO REPRESENTATIONS, WARRANTIES, OR CLAIMS THAT THIS PRODUCT COMPLIES WITH ANY APPLICABLE EMISSIONS LAWS AND EXPRESSLY DISCLAIMS ANY AND ALL SUCH REPRESENTATIONS, WARRANTIES, AND CLAIMS, WHETHER EXPRESS OR IMPLIED. BY PURCHASING THIS PRODUCT, YOU REPRESENT, WARRANT, AND AGREE THAT IT IS YOUR RESPONSIBILITY TO INFORM YOURSELF OF ANY LAWS OR REGULATIONS THAT MAY APPLY TO YOUR PURCHASE AND/OR USE OF THE PRODUCT.