★★★★★
“I got my BMW 3 Series booked in. Aaron was very helpful, clearly knowledgeable and has all the proper kit to get the job done right. Very satisfied with my result and will be coming back!”
Patryk · Google review
Big torque, done properly
BMW's diesels respond brilliantly to a good map. The 3.0 six-cylinders in particular feel like a different car at Stage 1 — but they also put real load through the gearbox and drivetrain. We calibrate torque delivery so the car pulls hard without hammering the automatic gearbox or tripping limp mode.
We also look at what usually goes wrong on these engines before we add power. The N47 is known for its timing chain; we'll listen for it and tell you if it's a concern. Glow plugs, swirl flaps, sensors and a blocked-up DPF all show up on a proper diagnostic check, so you're not paying to map a car that has a fault.
- 1 Series 118d / 120d / 123d
- 3 Series 318d / 320d / 330d / 335d
- 5 Series 520d / 530d / 535d
- X-models with the same engines (X1, X3, X5)
- Automatic and manual gearboxes
Typical BMW diesel gains
Standard → Stage 1. Figures depend on model, gearbox and condition.| Engine | Standard | Stage 1 |
|---|---|---|
| 318d / 320d 184 (N47) | 184bhp / 380Nm | 225bhp / 450Nm |
| 320d 190 (B47) | 190bhp / 400Nm | 230bhp / 460Nm |
| 330d / 530d 258 (N57) | 258bhp / 560Nm | 310bhp / 640Nm |
| 335d / 535d 313 (N57 twin-turbo) | 313bhp / 630Nm | 375bhp / 720Nm |
What we check on a BMW first
Fault codes
A full scan for stored and pending faults — swirl flaps, EGR, glow plugs and sensors.
Timing chain
On N47 engines we listen for chain noise and will tell you straight if it needs attention.
DPF & boost
Back-pressure and boost are checked so the map isn't fighting a restriction.
Gearbox
Torque is shaped to suit the box — especially on automatics.
What customers say
★★★★★
“Fantastic service from the guys at AR Performance, managed to squeeze me in their tight schedule to do glow plugs on my BMW. Highly recommended and will continue to use for all my car needs.”
Ri Michael · Facebook review
★★★★★
“100% recommend Aaron for any vehicle issues! Has done work on several of my cars, modified and stock: Lexus, BMW, Audi, Mini. Always does a good job and knows the deal with electrics too!”
Sunny Foster · Facebook review
Read more on Google and Facebook.
Common questions
Will a remap hurt my automatic gearbox?
Not when the torque is managed properly. We shape delivery to suit the gearbox rather than just raising the limit.
Can you remap a car with a DPF?
Yes — the DPF stays on and working. We check it isn't blocked before mapping, because a restricted DPF limits what any map can do.
My N47 rattles on start-up — can I still remap it?
Get the timing chain looked at first. We'll check it and tell you honestly whether it should be done before adding power.
Do you work on BMWs apart from remaps?
Yes — servicing, glow plugs, diagnostics and repairs. See servicing and diagnostics.