GKR Performance

19/10/2026

BMW G01 X3 40d — Stock Hardware, Custom Engine + Gearbox Calibration

A very strong result from this BMW X3 G01 40d in with us for custom engine tuning and custom 8HP transmission tuning.

This car is completely standard mechanically — no hardware changes — yet with the right calibration it delivered:

Stock:
🔹 325hp
🔹 673Nm

GKR calibrated:
🔺 398hp
🔺 800Nm

That’s a gain of:

+73hp
+127Nm

One important point here is that results like this are not just about asking the engine for more torque.

The factory transmission torque limit would normally cap this setup at around 750Nm, so to achieve this properly the car also received our custom Stage 3 8HP transmission calibration, including:

✅ Raised torque limits
✅ Enhanced shifting behaviour
✅ Calibration to properly support the increased engine torque output

This is exactly why engine and gearbox calibration should work together, not separately.

As always with our work, this was done while keeping the car’s DPF fully intact and operational, and with our usual attention to safe operation:

✅ Enhanced warm-up strategy
✅ Enhanced engine protection
✅ Correct torque modelling
✅ Proper integration between engine and transmission control

The result is a seriously capable X3 40d with strong performance, smooth delivery and the gearbox calibration needed to make the most of it.

Real calibration. Real integration. Real results.

14/10/2026

Visiting our agents DCL Tuning

26/09/2026

TRUE MULTI-MAP SWITCHING FOR BMW DDE6 — COMING SOON

We've been busy behind the scenes at GKR Performance HQ...

We're now in the final stages of developing true multi-map calibration switching for BMW DDE6 / EDC16, covering M47 and M57 applications.

And when we say multi-map, we mean actual calibration switching.

This isn't one calibration made to feel different by manipulating throttle maps or torque limiters. The ECU genuinely switches between separately defined calibration data, with selection via the factory cruise-control buttons.

It's working, and we're now completing testing and validation.

We'll also publish a continuous live-data log demonstrating the switching taking place. No carefully selected screenshots — the complete log is available for anyone who wants to examine or share it. Evidence is always more interesting than claims. 😉

Initially covering:

🔹 E8x 1 Series
🔹 E9x 3 Series
🔹 E6x 5 Series
🔹 E6x 6 Series
🔹 E6x 7 Series
🔹 M47 & M57 / DDE6 applications

Later BMW generations are next.

⚠️ This will be an in-house service ONLY, exclusive to GKR Performance HQ. It will not be offered as a remote file service.

We've occasionally heard suggestions that we don't develop our own calibrations. 😂

Those who've actually spent the day at GKR and watched us start with an original file, then build, log, revise, test and refine their calibration through multiple versions will probably have a different perspective.

If you've watched us build yours, feel free to share your experience below. 👇

Developed in-house. Tested in-house. GKR HQ only.

📊 The proof is in the logs:

https://drive.google.com/file/d/10V2nJS-ISLBwWGHvRO3XhK6UIIK-b4CU/view?usp=sharing

25/08/2026

TurboSystems N57N Upgrade Turbos — IN STOCK 🇬🇧

We now have a range of TurboSystems N57N upgrade turbochargers physically in stock at GKR Performance, ready for immediate dispatch:

🔺 Stage 2
🔺 Stage 2 Ball Bearing
🔺 Stage 3
🔺 Stage 4

No waiting for a turbo to be built or arrive from overseas.

More importantly:

THE PRICE YOU SEE IS THE PRICE YOU PAY.

✅ UK stock
✅ No import duty to pay afterwards
✅ No unexpected customs charges
✅ No additional import/handling fees
✅ Fully insured delivery
✅ Next-day delivery available

You simply pay the advertised turbo price plus delivery. That's it.

These are genuine TurboSystems N57N upgrade turbochargers, with several specifications available depending on the power level and intended use of the car.

We're also happy to advise on which stage is appropriate for your setup rather than simply selling the biggest turbo available. Supporting modifications, fuel system capability, sensors, cooling and the intended use of the vehicle all matter when choosing the correct turbo.

Available for supply only, or we can discuss the supporting hardware and calibration required to get the best from your chosen setup.

📦 In stock now at GKR Performance
🚚 Fully insured next-day UK delivery available

Message us for current pricing and availability.

14/08/2026

WORKSHOP & DYNO ASSISTANT – GKR PERFORMANCE

Full-time position
Salary: Dependent on experience

GKR Performance is looking for a reliable, motivated and practical individual to join our team as a Workshop & Dyno Assistant

This is a varied, hands-on role within a busy automotive performance and tuning workshop, combining workshop duties, vehicle preparation, dyno support, administration and social media.

Key Responsibilities

* Loading and safely securing vehicles on the dyno
* Vehicle preparation and general workshop duties
* Uploading tuned files to vehicles (training provided)
* Moving and positioning vehicles
* Cleaning vehicles, workshop areas and equipment
* Basic workshop/equipment maintenance
* Keeping the workshop clean and organised
* Responding to customer emails and preparing estimates
* General administrative duties
* Taking photos/videos and assisting with social media content
* Supporting the team with day-to-day tasks

Essential Requirements

* Full, clean UK driving licence
* Genuine interest in cars and the automotive industry
* Practical and comfortable with physical work
* Basic computer/email skills
* Good communication and attention to detail
* Reliable, punctual and hardworking
* Able to work independently and as part of a team
* Willing to learn and take on new responsibilities

Desirable but not essential: Previous workshop or mechanical experience, knowledge of vehicle tuning/ECU software, dyno experience, customer service/admin experience or social media content creation.

Specialist training will be provided, so previous tuning experience isn't essential. We're primarily looking for someone with the **right attitude**, who takes pride in their work, is dependable and isn't afraid to get stuck in.

If you're passionate about cars and want a varied role within the performance automotive industry, we'd like to hear from you.

To apply, send us your CV along with a brief message explaining why you'd be suitable for the role. You can Email them here: [email protected]

25/07/2026

A little something for myself...

After spending most of my time building and calibrating cars for everyone else, I finally treated myself.

Meet my BMW E65 745d.
Powered by the M67TU – BMW's legendary 4.4-litre twin-turbo V8 diesel.
A bit of BMW history...

• BMW's largest production diesel engine ever built. • Twin turbocharged V8. • 4421cc. • Produced around 329hp and 750Nm from the factory. • Discontinued without a direct successor.

In many ways it marked the end of BMW's V8 diesel era.

As most people know, I have a bit of a soft spot for unusual BMW engines, and this one has been on my wish list for a long time.

It's in lovely condition, completely standard, and I plan on keeping it that way for now while I get to know it.

I'm sure there will be plenty of interesting technical posts along the way, as these engines aren't something you see every day.

Who else appreciates the forgotten BMWs that never really got the recognition they deserved?

09/06/2026

05/06/2026

Mahle air filters trusted by GKR. OEM-quality fitment, reliable engine protection, and excellent filtration for everyday driving.

31/05/2026

BMW F31 335xd (2014) — 403.5hp With The DPF Still Intact

A lot of people will tell you that 400hp+ on a 335d means removing emissions equipment.

This car proves otherwise.

📈 Independently tested at Surrey Rolling Road, producing:
🔺 403.5hp

All while retaining a fully functional DPF system.

Modifications are straightforward and sensible:

✅ Intercooler upgrade
✅ Engine calibration
✅ Transmission calibration
✅ EGR optimisation
✅ Swirl flap optimisation
✅ DPF retained and fully operational

No smoke maps.
No disabled DPF strategies.
No shortcuts.
Just a properly calibrated setup designed to make reliable power while retaining the systems BMW engineered into the vehicle.

One thing often overlooked is that a healthy DPF is not the restriction many people assume it is. When the engine, turbochargers, sensors and calibration are all working together correctly, there is still plenty of performance available without removing it.

This result was achieved with the DPF remaining in place and functioning exactly as intended.

Independent dyno figures are always nice to see because they remove any doubt and provide a completely unbiased result.
403.5hp.
DPF retained.
Verified independently.
Real calibration.
Real protection.
Real results.

+

18/05/2026

BMW F31 320d LCI (B47) — Stage 1 Calibration
Stock hardware. Stock drivability. Just done properly.

This 320d LCI came in completely standard, factory rated at 190hp / 400Nm. Before calibration, we carried out full logging and dyno testing to confirm the car was healthy mechanically and performing as expected.

📊 Results:

Stock:
🔹 189hp
🔹 413Nm

GKR Stage 1:
🔺 226hp
🔺 513Nm

The virtual dyno data and dyno printouts correlate extremely closely, which is always a good sign of a healthy setup and accurate calibration.

This car also received our usual supporting calibration work including:

✅ Correct torque model calibration
✅ EGR optimization with DPF regeneration strategy retained
✅ Swirl flaps left fully active
✅ Factory safety and thermal protections retained.
✅ Additional enhanced protection strategies where beneficial

No disabled safeguards.
No “flash and hope”.

Just smooth, factory-like drivability with a substantial increase in usable torque and power throughout the rev range.

The result is a car that feels exactly how a 320d should have left the factory — responsive, efficient and properly calibrated.

Real calibration.
Real protection.
Real results.