BMW 745e on the 4WD linked dyno at DC Remapping UK

ECU Calibration · Stage 1

BMW 45e Hybrid Stage 1 Remap

G-Series B58 Hybrid · 3.0 Straight-Six + eDriveCustom dyno ECU tuning for the BMW 45e hybrid, 545e, 745e and X5 45e. Big combined-output gains, tailored specifically to your vehicle on our 4WD linked rolling road.

+115hpPower Increase · 394 to 500-520 HP

+215NmTorque Increase · 600 to 800-830 Nm

394hpFactory Combined Output · B58 engine + eDrive motor

Book Your Appointment See the dyno results

4WD linked dyno, xDrive-safe
S1 · Stage Level · No Hardware Mods
Hybrid strategies respected
Tuning BMWs for 15+ years

About This Tune

B58 Hybrid. Exceptional Results.

The BMW 45e pairs the brilliant B58 3.0-litre straight-six petrol engine with BMW's eDrive electric motor, silent EV running around town, effortless six-cylinder muscle everywhere else. It's one of the cleverest powertrains BMW makes, and one with serious untapped potential.

In factory form BMW quote a combined output of around 394bhp and 600Nm across the 545e, 745e and X5 45e. As with every BMW platform, the factory calibration is deliberately conservative, leaving substantial headroom on the combustion side of the powertrain.

With our Stage 1 custom dyno ECU tuning, we achieve combined outputs of 500 to 520bhp and 800 to 830Nm. Throttle response sharpens, the mid-range swells and the way the petrol and electric sides hand over becomes even smoother, all without sacrificing the 45e's refinement or its EV running.

Our calibrations are torque-managed, gear-aware and safety led, the hybrid system's own strategies are fully respected, so power is delivered progressively and sympathetically to the drivetrain. Every calibration is developed in-house on our 4WD linked dyno and tailored to the exact vehicle in front of us. No generic files and no compromises.

Compatible Models

BMW 545e xDrive (G30)
BMW 745e / 745Le (G11/G12)
BMW X5 xDrive45e (G05)

Live Dyno Data

The Numbers Don't Lie.

BMW 745e dyno chart — 394.5hp/577Nm stock vs 514.5hp/811Nm DC Stage 1

Measurement	Stock	DC Stage 1
Engine Power	394 HP (combined)	500-520 HP +115hp
Engine Torque	600 Nm (combined)	800-830 Nm +215nm

Power394510bhp+116 bhp · +29%

Torque600815Nm+215 Nm · +36%

Chart shows a real customer BMW 745e measured on our 4WD linked dyno, 394.5hp / 577Nm stock to 514.5hp / 811Nm with our Stage 1 calibration. Exact results vary by model and battery state of charge; you receive your own before and after printout.

Customer Reviews

What Our Customers Say.

What BMW owners say on Google

4.9 from 269+ Google reviews

★★★★★

Had my bmw 420i remapped and gearbox software on 29/08/25. Customer service was great, and any questions I asked they were more than happy to explain. Friendly atmosphere and good set up. The car feels totally different. …

Jamie Wilson · BMW 420i · Google review

★★★★★

What a great place to get your cars remapped dan is a lovely guy who welcomes you an tunes your car safely so happy with my bmw stage 1 388.9 bhp with xhp what a combo will be back for more in the future cheers again dan

Wezim Mirza · BMW · Google review

★★★★★

Great company! Very knowledgeable was a great experience highly recommended to anyone who wants the best out of there car!

Kane Morgan · BMW owner · Google review

Quoted word for word from our Google reviews. Read them all on Google.

Gearbox Software

xHP Flash.

The 45e uses a ZF8 automatic with BMW’s electric motor integrated into the housing, an exceptionally strong unit. Optimising the gearbox alongside the engine calibration transforms how the car delivers its combined output.

From the factory the gearbox is programmed to prioritise comfort and fuel economy. xHP software unlocks its full potential, with sharper and faster shifts that better match the increased torque output from your Stage 1 tune. The ZF8 is capable of handling up to 950Nm of torque, making it the perfect pairing for our engine calibration.

The result is a car that feels substantially more alive. Power gets to the wheels quicker, the gearbox holds gears when you want it to and the overall driving experience is transformed across all conditions.

Faster, Sharper ShiftsDramatically reduced shift times across all modes. Sport and manual become genuinely responsive.
Torque Limit RemovalFactory TCU torque limiters are raised to correctly handle the elevated output of your Stage 1 tune.
Improved Launch ControlSmarter launch control function for maximum acceleration from a standstill.
Smarter Shift PointsOptimised shift points for both performance and comfort across Stage 1, Stage 2 and Stage 3 profiles.
Fully ReversibleCan be restored to factory settings at any time. Your gearbox ECU is not permanently altered.

Watch It Run

On the Dyno.

Watch a BMW G-Series run on our V-tech 4WD Linked Dyno. Our dyno is fully xDrive safe, using mechanically linked axles to protect your transfer box and give accurate, repeatable results every time, essential for a hybrid xDrive like the 45e.

How It Works

The Process.

Full Diagnostics

Full diagnostics, live data checks and a health assessment including hybrid-system status. Any issues are resolved before we begin tuning.

Baseline Run

Your 45e is strapped to our mechanically linked 4WD dyno for a baseline power run. We capture exact stock figures before any changes are made.

Custom Calibration

Our technicians write and apply a bespoke calibration developed specifically for the B58 hybrid platform. No generic files, ever.

Power Run & Verify

We run the car again to verify results and fine-tune if needed. You receive a full before and after dyno printout to take away with you.

Our Equipment

V-Tech 4WD Linked Dyno.

We use the V-tech 4WD Linked Dyno, one of the most advanced rolling road systems available. Crucially it is xDrive safe, meaning BMW's all-wheel drive system is fully protected throughout the entire testing process.

Unlike non-linked dynos which can damage the transfer box or give false torque readings, our linked axle technology ensures both front and rear rollers turn in perfect synchronisation. Accurate, real-world performance data every time.

Linked Axle TechnologyFront and rear rollers synchronised for true AWD compatibility
xDrive SafeBMW's intelligent AWD system is fully protected throughout all runs
Accurate, Repeatable DataEvery run logged with ambient pressure and temperature for consistency
Full Printout IncludedYou receive a before and after dyno sheet with all power and torque figures

FAQs

BMW 45e Tuning Questions

How much power will a Stage 1 remap add to my BMW 45e?

Our Stage 1 maps are custom-built on our in-house 4WD dyno and tailored to your exact BMW 45e, never a generic off-the-shelf file. You'll see a substantial, fully dyno-proven gain in both power and torque; the headline figures for this platform are shown at the top of this page. Because every map is refined over multiple runs, the results are realistic, repeatable and safe.

Is remapping my BMW 45e safe and reliable?

Yes. We tune strictly within the safe mechanical limits of your BMW 45e's engine and gearbox, monitoring temperatures, pressures and torque loads across multiple dyno pulls. We've spent 15+ years tuning these platforms, so our maps prioritise long-term reliability alongside performance.

Will a remap affect my warranty or insurance?

A remap is an aftermarket modification, so it's the owner's responsibility to declare it to their insurer. Our maps are fully reversible, we can return the BMW 45e to its factory software whenever you need, for example before a main-dealer visit.

Is the remap reversible?

Completely. It is fully reversible: your BMW 45e can be put back to its factory software at any time.

Will tuning improve my BMW 45e's fuel economy?

We tune for performance, not fuel economy, so we don’t promise or guarantee any MPG saving. How much fuel the car uses comes down mostly to how it’s driven, and using the extra performance will use more.

How long does it take, and do you tune on a dyno?

Most Stage 1 tunes are completed within a few hours; allow up to a day for combined ECU and gearbox work. Every BMW 45e is mapped on our in-house 4WD dyno in Warrington, never on the road, so the result is measured and consistent. You're welcome to relax in our customer waiting area while we work.

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