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A Stage 1 remap takes the F30 335d xDrive from 313PS and 630Nm to around 365PS and 710Nm on our rolling road. The earlier E90 335d, which makes 286PS and 580Nm as standard, goes to around 350PS and 680Nm. It is one of the strongest diesels BMW built and it takes tuning very well, mostly as torque, which is why owners describe the change as the car feeling a gear taller everywhere.
Measured on our Mustang AWD rolling road in Maidstone. Wheel figures, drivetrain loss added for the flywheel numbers.For years, the 3-series diesel cars have been very popular for tuners. Diesel engines gain lots of power and even more torque when remapped. This is mostly due to the much higher compression ratio of diesel compared to petrol. Alongside this, diesel is a lot denser than petrol and is able to store 15% more energy per given volume. These factors result in more energy being transferred into pressure on the piston; increasing the torque acting through the crankshaft. The 335D is absolutely no exception to this. We offer our stage 1 335D tuning package here at JF Automotive or through our dealer network.
BMW 335D Stock Figures
The 3.0l Diesel engine in the 335D has some very impressive figures out of the factory. BMW says it produces 308BHP and 630Nm torque. That’s pretty quick for a car that you can buy in an estate shape! We put the car on the dyno and carried out some stock runs so that we had a baseline to compare our stage 1 software against. We found that this car in particular was actually running 313BHP and 653Nm torque! German car manufacturers generally understate their power figures when releasing a new model so we expected a small increase like this.
BMW 335D Tuning Figures
We spent a couple of hours analysing the hundreds of maps within the ECU to make the perfect tune. After a bit of magic from our tech guys, the car is producing 375BHP and 815Nm torque! We transformed this car from a pretty nippy diesel BMW to a real competitor to cars like the Golf R which has a power-to-weight figure of 203BHP/tonne, compared to our new and improved 335D at 216BHP/tonne! The benefits don’t stop there though as the dyno graph shows; both power and torque delivery is much smoother now making for a much better ride all the time, whether you’re driving 30 or 70mph.
If you own a diesel BMW yourself and would like more power and even more torque, we can write performance software for virtually any model, enquire with us today!
Photos from the build
2 photos of this BMW 3 Series E90 (2005 - 2010) in our Maidstone workshop. Tap any to enlarge.
Questions we get asked
How much power does a 335d make remapped?
The 313PS F30 xDrive goes to around 365PS and 710Nm at Stage 1. The 286PS E90 goes to around 350PS and 680Nm. Those are our own dyno figures on standard hardware, with the turbos, exhaust and emissions equipment untouched.
Is the 335d engine strong enough for a remap?
The N57 in the F30 and the M57 in the E90 are both robust units and neither is troubled by a sensible Stage 1. What matters more is condition: we check the car over first, and on higher mileage examples we look at the turbos and the EGR before writing anything.
Will the gearbox handle the extra torque?
The ZF 8HP in the F30 will, but it has a torque limiter in its own software that can clip the gain. Tuning the gearbox raises the limiter so you get what the engine is making, and speeds up the shifts at the same time.
Will it improve fuel economy?
Usually yes on a steady motorway run, because the engine is working less hard to hold the same speed and you can sit a gear higher. Driven harder it will use more. Treat the economy as a bonus rather than the reason.
What about the DPF and AdBlue?
They stay. We do not remove emissions equipment on a road car; it is an offence to use a vehicle with it disabled and the car fails its MOT. If the DPF or the SCR system has a fault, we diagnose and repair it, and the remap goes on a healthy car afterwards.
How long does it take?
About two hours through the diagnostic port, including a road test, and we keep your original file so the car can go back to standard whenever you want. Add dyno runs if you would like the before-and-after graph.
