Posted by Trent on Apr 25th 2025
B9.5 A4 A5 Q5 45TFSI TUNING NOW AVAILBLE!
B9.5 Audi A4 / A5 / Q5 45 TFSI Tuning — Now Available
The only USA-based tuner with proven calibrations for the 2021–2025 hybrid EA888 platform.
Stage 1 through Stage 2+ E85 — up to 350 WHP.
View All Stages & Pricing →We've been getting the same question for years: "When are you going to support the B9.5?"
The answer is now. Boost Dynamic Tuning has released full ECU calibrations for the 2021–2025 Audi A4, A5, and Q5 45 TFSI — the B9.5 hybrid EA888 Gen 3 2.0T platform running the SIMOS 19.7 ECU.
This isn't a port from an older platform. The B9.5 hybrid ECU strategy is fundamentally different from earlier EA888 setups, and most tuners in the U.S. still don't have a working answer for it. Integrated Engineering doesn't support it. 034Motorsport doesn't support it. BDT does — and every calibration is built from scratch in-house, validated through real-world logging and dyno testing.
Why the B9.5 Is Different
The 2021+ refresh brought significant changes under the hood. The hybrid EA888 uses a revised turbo integration, updated fueling strategy, and a completely new ECU calibration architecture on SIMOS 19.7. Off-the-shelf tunes from the B9 era don't work here — the tables, maps, and logic structures are different.
That's exactly why most tuners skipped it. Cracking the B9.5 hybrid required months of research, reverse engineering, and dyno validation. BDT put in that work. The result is a lineup of five stage options covering everything from a bolt-on-friendly Stage 1 to a full-send Stage 2+ E85 calibration pushing 350 WHP and 390 WTQ.
What's Available
Every stage includes multi-level crackle/overrun pops (Dynamic mode only), speed limiter removal, raised torque and load limits, recalibrated boost gauge, IAT safety alert, and optimized VVT timing. All stages flash remotely through the OBDII port — no shop visit required.
Dyno Proof — See the Numbers
We don't make claims we can't back up. Here are the actual dyno sessions recorded live at the shop.
Stage 1 — 93 Octane
Stage 1+ — 93 Octane
Stage 2 — 93 Octane
Stage 2+ E85
BDT Stage 2 vs JB4 Stage 2 — Head to Head
Same car. Same fuel. Same dyno. We put our Stage 2 calibration up against a JB4 Stage 2 piggyback tune to let the numbers speak for themselves.
Crackle Pops / Overrun Demo
Every stage includes BDT's multi-level crackle and overrun calibration — active in Dynamic mode only. Low, Medium, and Intense levels are available. Here's what it sounds like in the real world.
Straight From Our Customers
Don't take our word for it. Here's a live phone conversation with a real BDT customer, plus footage submitted by an owner after their flash.
Live Phone Chat — Customer Review
Customer-Supplied Video
How Remote Tuning Works
No shop. No appointment at a dealer. No tow truck. BDT's remote tuning process lets you flash your ECU from your driveway in about 15–20 minutes. All you need is a Windows laptop, stable internet, a battery charger, and the BDT tuning cable (included with your purchase). We log into your laptop via TeamViewer and handle everything — you watch it happen live.
Compatible Vehicles
2021–2025 Audi A4 45 TFSI (B9.5)
2021–2025 Audi A5 45 TFSI (B9.5)
2021–2025 Audi Q5 45 TFSI (B9.5)
Engine: Hybrid EA888 Gen 3 2.0T • ECU: SIMOS 19.7 • Flash Method: Remote OBDII
If you're unsure whether your specific vehicle or ECU box code is supported, reach out before purchasing — we're happy to confirm compatibility.
Ready to Tune?
Stop leaving power on the table. Whether you're looking for a clean Stage 1 daily driver upgrade or a full-send Stage 2+ E85 build, BDT has you covered — with the only proven B9.5 hybrid calibrations in the country.