2021 - 2025 Audi A4 A5 Q5 40 TFSI 2.0T ECU Performance Tune

$1,000.00 - $1,600.00
(1 review)
Current Stock:
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Software Product — No Vehicle IncludedThis listing is an ECU calibration file and remote flashing service for the vehicle listed above. Boost Dynamic Tuning does not sell, broker, or supply motor vehicles. Vehicle names, model years and photographs are used solely to identify which car this software is compatible with.
Boost Dynamic Tuning • World's First

Audi A4 / A5 / Q5 40 TFSI ECU Tune

Real Numbers. Real Pulls.

Tap a stage — power, fuel, and required mods at a glance. Stock and Stage 1+ wheel numbers come straight off our Mainline DynoLog sheets — the chart draws Stage 1 and Stage 1+ against stock, and the full before/after session is on video below. Stage 1+ E85, Stage 2 and Stage 2+ E85 hit the rollers next.

Horsepower203.1WHP+29 HP over stock
Torque240.4WTQ+37.5 TQ over stock
Fuel: 91 / 93 octaneRequired mods: none — stock hardwareData: 91 / 93 pump-gas file • 20 HP / 20 TQ under Stage 1+
Horsepower223.1WHP+49 HP over stock
Torque260.4WTQ+57.5 TQ over stock
Fuel: 93 octaneRequired mods: none — stock hardwareData: peaks dyno-verified • on video
Fuel: E85Required mods: none — stock hardwareDyno: sheet coming soon — next on the rollers
Fuel: 93 octaneRequired mods: high-flow exhaustDyno: sheet coming soon — next on the rollers
Fuel: Full E85Required mods: high-flow exhaust + intercoolerDyno: sheet coming soon — next on the rollers
5010015020025030020003000400050006000
WHPWTQStock baseline — 174.1 WHP / 202.9 WTQSTAGE 1 OUTPUT — 203.1 WHP / 240.4 WTQSTAGE 1+ OUTPUT — 223.1 WHP / 260.4 WTQSTAGE 1+ E85 — dyno sheet coming soon • chart shows Stage 1+ vs stockSTAGE 2 — dyno sheet coming soon • chart shows Stage 1+ vs stockSTAGE 2+ E85 — dyno sheet coming soon • chart shows Stage 1+ vs stock

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. What can't be faked is the delta: same car, same dyno, same 93-octane pump gas, stock vs Stage 1+ — on camera, in the video below.

 

How It Works — Flash From Your Phone

No shop visit. No laptop. Flash your 40 TFSI straight from your phone with the BDT flasher app and our Bluetooth OBDII dongle — then data-log and refine from the same phone.

1

Get Access — after purchase you're set up with the BDT flasher app and your calibration files.

2

Plug In — pop the BDT Bluetooth OBDII dongle into the port, pair your phone, battery healthy, key on.

3

Flash It Yourself — pick your stage in the app and flash it over Bluetooth in minutes. Switch stages or return to stock any time.

4

Data-Log From Your Phone — record live engine data right in the app and send it to BDT so we can dial your car in.

Unlimited File Updates — whenever BDT releases an updated calibration for the 40 TFSI, it lands in your app at no extra cost. You get every published file update we push to the platform — not one-off custom revisions, but every improvement we make for the whole platform, for as long as you own the car.

What's Included

Flash From Your PhoneBDT app + Bluetooth OBDII dongle — no laptop, no shop
Unlimited File UpdatesEvery new file we release for the 40 TFSI, at no extra cost
Phone Data LoggingRecord and share live engine data from the app
Optimized Boost & TorqueDelivery dialed across every stage
Crackles — Dynamic ModeLow / Medium / Intense-Flames, all stages
Speed Limiter RemovedFactory Vmax restriction deleted
Torque + Load Limiters RaisedFactory caps lifted for full delivery
True E85 StagesStage 1+ E85 and Stage 2+ E85 calibrations
IAT Safety AlertDash warning when you are pushing heat too hard

Safety

Crackles are only fun if the car is still healthy next year. Our crackle logic is temperature-gated: when the engine runs past our heat threshold it switches the pops off by itself, then brings them back once things cool down. No guesswork, no melted parts — watch it happen.

Crackles Shut Off When It's Too Hot

Why It Matters

Overrun crackles are made by burning fuel late, after you lift. Do that on a car that is already heat-soaked and the exhaust side takes the punishment. That is why ours are not always-on: the calibration watches temperature and disables the crackle strategy automatically when it gets too hot, then re-enables it when the engine is back in its normal range.

Full sound when the car is at normal operating temperature. Automatic shut-off when it is not. You keep the pops and the engine keeps its margin.

Watch The Proof

Stock vs Stage 1+, back to back on our AWD hub dyno — 93 octane straight from the Shell pump, no additives, live data — plus a Stage 2 customer in his own words. Sound on.

Dyno Session — Stock vs Stage 1+

Less Boost. More Power.

This A4 rolled in running 25 psi from the factory. We didn't pile more on top — we pulled it back to 22–23 psi, added ignition timing and re-phased the cam timing. Result: +49 WHP and +57.5 WTQ on the same 93-octane pump gas, with the turbo working less. That's what a real calibration does.

Stock: 174.1 WHP / 202.9 WTQ
Stage 1+: 223.1 WHP / 260.4 WTQ
Boost: 25 psi factory → 22–23 psi tuned
Fuel: 93 octane, Shell pump, no additives

Customer Review — Stage 2

 

What Your Car Needs, Per Stage

If it is not listed as required, the tune runs without it.

REQ Required before flashing REC Recommended Not needed
Part / UpgradeS1S1+S1+ E85S2S2+ E85
High-Flow Exhaust CTS B9.5 A4/A5/Q5 2.0T options: test pipehigh-flow catinstall videoREQREQ
Intercooler Highly recommended from Stage 1+ E85 upRECRECRECRECREQ
Air IntakeRECRECRECRECREC
Drivetrain InsertsRECRECREC

TCU tune is not available on this platform. Final output varies with fuel quality, altitude, temperature, and vehicle health.

Maintenance

Maintenance ItemInterval
SPARK PLUGS
NGK 4905 R7438-8 Racing Plughow-to video below
15-20K mi
OIL CHANGE
5W-40 Liqui Moly • OEM FILTER ONLY • how-to video below
5K mi
DSG / MANUAL TRANS FLUSH & FILTER
OEM only
30K mi
CENTER DIFF FLUID CHANGE
quattro center differential • OEM fluid only • step-by-step video below
See video
MAP SENSORS
OEM only • intake / before throttle body
80K mi
PCV ASSEMBLY80K mi
INJECTORS + CARBON CLEANING
Do them on time to avoid misfires, lean conditions, and long-term damage
85K mi

Do It Yourself — Step-By-Step Videos

Filmed in the BDT shop on the B9.5 2.0T platform. Every job in the table above that we get asked about, on camera. Sound on.

Center Diff Fluid Change — B9.5 quattro

Oil Change — B9.5 2.0T

Spark Plug Change — B9.5 2.0T

High-Flow Cat Install — CTS Turbo

 

Your ECU Is Safe

Your stock file is savedWe read and archive your factory file before a single byte is written. You can flash back to stock at any time, free.
Verified writes, safe abortsEvery flash is checksum-verified. If the connection drops mid-write the process aborts safely and can be resumed — it does not leave your ECU half-written.
You talk to the calibrator11+ years of in-house VAG calibration. The person who built your file is the person on the phone — not a reseller passing on someone else’s tune.

Reviews

  • 5
    Ecu Tune

    Posted by dante mangery on Aug 1st 2026

    no one else is doing it like boost dynamic tuning this tune wakes the car up its not sluggish no more i got stage 1+ and im loving it