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2015 -2021 AUDI A3 1.8T Stage 2

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Width:
7.00 (in)
Height:
1.00 (in)
Depth:
6.00 (in)
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BOOST DYNAMIC TUNING

BDT Stage 2 ECU Tune

2015–2021 Audi A3 (8V • EA888 Gen 3 • 1.8T IS12)

Stage 2 is where the A3 1.8T turns into a different car. With the right bolt-ons (especially a high-flow downpipe), BDT Stage 2 delivers a harder hit of torque, stronger pull through the midrange, and cleaner, more confident top-end — without sacrificing daily drivability.

Stage 2 Bolt-On Calibrated Multi-Map Switching OEM Safety Logic
Audi A3 Stage 2 hero
STAGE 2 POWER
High-flow exhaust-ready torque. Stronger midrange + higher sustained pull.
OBDII flashing
REMOTE FLASHING
No ECU shipping. Flash at home via OBDII.
Performance hardware
BOLT-ON OPTIMIZED
Downpipe + intercooler for repeatable pulls and safer IAT control.
 
 
Stage 2 Requirement: A high-flow exhaust is required. An intercooler is strongly recommended.

Fitment & Compatibility

Confirm your exact engine and hardware before purchase.

 

Vehicle: 2015–2021 Audi A3 (8V) 1.8T

Engine: EA888 Gen 3 • IS12 turbo

  • FWD supported
  • DSG supported
  • Remote OBDII flashing compatible

Stage 2 Driving Feel

  • Torque: heavier hit + stronger gear-to-gear pull
  • Midrange: more “shove” where you actually drive
  • Consistency: intercooler keeps pulls repeatable
  • Daily: smooth when cruising, violent when you want it
 

93 OCTANE recommended for maximum output (maps may vary).

Unlock the Full Potential of Your Audi A3 (8V) 1.8T

Exclusively Tuned by Boost Dynamic Tuning — Built by Enthusiasts, for Enthusiasts

BDT Stage 2 is calibrated for bolt-on airflow and exhaust changes — especially a high-flow downpipe — with torque modeling, boost control, and safety logic refined for repeatable, real-world performance.

With 11+ years of hands-on tuning experience and ongoing development on the EA888 platform, BDT Stage 2 delivers the power you want, the smoothness you expect, and the reliability your daily needs (when you follow the maintenance guide below).

Why Choose BDT?

  • Audi/VAG-Specific Expertise: Purpose-built for EA888 Gen 3 1.8T (IS12) with Stage 2 bolt-on logic.
  • Authenticity Over Hype: Every map written in-house — no resellers, no copy/paste files.
  • Remote Flashing: Install via OBDII from home. No ECU shipping. No shop schedule.
  • Dyno-Tested & Street-Proven: Safe, repeatable gains validated in real conditions.

Stage 2 Highlights

  • Multi-Map Switching (5 maps) — on-the-fly via cruise controls
  • Rolling Anti-Lag (RAL) — build boost while moving (track/off-road)
  • 2-Step (Manual only)Boosted Launch (DSG) with BDT TCU logic
  • Downpipe-Optimized Boost Control for stronger, cleaner pulls
  • Intake Air Temp Safeties + EGT Safety Logic
  • Speed Limiter RemovedNeutral/Park Rev Limit Raised
  • Auto Start/Stop Defaults Off (feature remains functional)
  • Torque Limiters RaisedFuel/Torque Request Optimized
  • Boost Gauge Re-ScaledVVT Optimization
  • Overrun / Crackle Pops (optional) • Low-Medium-Intense/Flame
  • OBDII Port Flashing

Crackle Pops — Controlled Overrun

Stage 2 hardware makes overrun even more noticeable. Selectable Low / Medium / Intense-Flame levels in Dynamic mode. Subtle on stock exhaust, aggressive with free-flowing setups.

⚙️ Boost Control Recalibrated

With Stage 2 airflow, boost control matters more than ever. BDT rewrites the logic to deliver:

  • Smoother, more linear boost ramp
  • Harder midrange hit without “spike-y” behavior
  • Repeatable pulls with smarter safety interventions

Power Gains

Expected Stage 2 output on 93 octane: up to 315 HP / 355 TQ (crank estimate).
Estimated wheel output (for comparison only): ~268 WHP / 302 WTQ (based on typical ~15% drivetrain loss).

 
Stage Horsepower Torque
Stock Audi advertised numbers 170 HP 184 TQ
Stage 2 (crank estimate) 268 HP 355 TQ

Results vary by dyno type, fuel quality, altitude, and supporting hardware. Stage 2 requires proper bolt-ons (see below).

Stage 2 Hardware Requirements

Stage 2 Hardware Requirements (quick view):

  • Required: High-flow downpipe (catted or catless) + no exhaust leaks
  • Strongly recommended: Upgraded intercooler (for consistent pulls / IAT control)
  • Recommended: Intake, colder plugs, drivetrain inserts
  • Highly recommended: BDT TCU tune (especially DSG)

Upgrade matrix:

Part / Upgrade Required Recommended
High-Flow Downpipe / Exhaust Flow YES
Upgraded Intercooler STRONGLY
TCU Tune Highly Recommended
Air Intake X
Colder Spark Plugs X

Multi-Map Layout

  • Map 1: Daily (low boost), RAL ON, 2-Step ON, Pops OFF
  • Map 2: Daily (standard), RAL ON, 2-Step ON, Pops OFF
  • Map 3: Race — NORMAL TIMING, RAL ON, 2-Step ON, Pops ON
  • Map 4: Race — HIGH BOOST, HIGH TIMING, RAL ON, 2-Step ON, Pops ON, 100 OCTANE REQUIRED
  • Map 5: Valet — RAL OFF, 2-Step OFF, Pops OFF

Software Install Requirements

WINDOWS LAPTOP REQUIRED (NO APPLE)

50 Mbps+ INTERNET RECOMMENDED

8GB RAM MINIMUM RECOMMENDED

Maintenance (Read This)

IF YOU WANT YOUR CAR TO SURVIVE, THESE MUST BE DONE!

I WANT YOUR CAR TO SURVIVE MULTIPLE YEARS TO COME WITH MY TUNE. I DON'T JUST RECOMMEND THESE FOR FUN. I HAVE TUNED COUNTLESS AUDI 8V CARS AND THIS IS WHAT I'VE EXPERIENCED THROUGH THE YEARS. IF YOU CAN'T AFFORD THE PARTS, PLEASE DON'T TUNE YOUR CAR. NOT BEING HARSH, BEING STRAIGHTFORWARD SO YOU DON'T BLAME MY TUNE THAT ARE ON COUNTLESS CARS WITHOUT ISSUES BECAUSE THEY FOLLOW MY MAINTENANCE GUIDE.

 
Maintenance Schedule Miles
SPARK PLUGS
NGK Racing Plugs
https://www.ngk.com/ngk-4905-r7438-8-racing-plug
15–20K
OIL CHANGE
5W-40 Liqui Moly • OEM filter only
5K
REAR HALDEX FLUID (Quattro) 30K
TRANSMISSION FLUSH / FILTER
OEM only
30K
MAP SENSORS
OEM only • Intake / before throttle body
50K
PCV ASSEMBLY 50K
INJECTORS + CARBON CLEANING 65K

Late Policy: If you book an in-person flash and arrive late without notice, a $50 fee applies. Reschedules must be made at least 1 hour prior.