For the BMW Z4 Roadster M40i sDrive30i sDrive20i G29 dAHLer offers a broad range of BMW tuning performance products. Our engine tuning works with cars before and after production 06/2020!
Available are lowering kits, 21” wheel and tire sets, performance exhaust parts, exhaust flap controller, glass wind deflectors, front splitter, mirror caps and other high-performance tuning components will transform your stock BMW Z4 Roadster M40i sDrive30i sDrive20i G29 into a true power Roadster.
BMW M40i: Engine Performance Tuning
EU Version -> US Version
Max HP gain:
68 hp (50 kW) -> 50 hp US
Max Torque gain:
100 Nm -> 74 ft-lbs US
340 hp (250 kW) -> 382 hp US
500 Nm -> 369 ft-lbs US
408 hp ( kW) -> 432 hp US
600 Nm -> 443 ft-lbs US
Based on 98 octane -> 93 octane US
Features - Engine Upgrade
- Works with cars before and after production 06/2020
- No removal of the DME required
- Controlling of the Performance Tuning via your smartphone
- Quick Plug & Play Installation
- Runs as smoothly as stock, this is how your BMW should have come from the factory
- Compatible with all driving modes
- Fuel economy unchanged during normal driving
- 93 octane or less compatible tuning maps
- Not VIN locked, can be removed without a trace and resold down the road
- Developed in Switzerland and Made in Germany
- Tested on the German Autobahn
- Comes with TUV Part Approval (emission tests according to WLTC regulations)
- USA -> EPA compliant
- Worldwide 3-year product warranty
Controlling of the dAHLer Engine Performance Upgrade via your smartphone is just one of the awesome features of our tuning module.
With our tuning module you have the option to choose your own and fully customizable driving program. Wirelessly connect the dAHLer engine tuning performance module to your Bluetooth 4.0 compatible iOS and Android device via the free dAHLer Mobile app.
This option allows you to change 3 different performance maps, and update the firmware worldwide as we release free newer versions with updates, more powerful maps. If desired the extra power can be easily switched on or off with your smartphone, even while driving.
Our app includes a configurable warm-up timer, so the pilot can decide how long warming up is needed before using the engine tuning. A separate Mobile app purchase is not required!
We will provide you the app after the purchase of our engine performance upgrade free of charge.
About our technology
Our Engine Performance Tuning Module for the BMW Z4 Roadster M40i sDrive30i sDrive20i G29 integrates flawlessly to extract maximum power and torque without faults and errors – just flawless. The harness has OEM style plugs to connect in-line with each boost pressure sensor and the camshaft position sensor on the engine.
Our Engine Performance Tuning Module for the BMW Z4 Roadster M40i sDrive30i sDrive20i G29 is completely reversible to OEM specs and installs in less than 45 minutes just in a few simple steps. This will be a safely upgrade which makes this the easiest and most effective power upgrade you will ever make on your BMW Z4 Roadster M40i sDrive30i sDrive20i G29. For a substantial increase in power output, with minimal downtime for installation, full serviceability, and can be reverted back to stock then this Engine Performance Tuning Module power upgrade is best!
Inside our dAHLer Engine Performance Tuning Module is an advanced control unit that is designed to optimize and work with the factory BMW ECU. BMW Z4 Roadster M40i sDrive30i sDrive20i G29 maps and algorithms within the control unit have been elevated for this BMW engine, sending improved fuel and ignition parameters to the stock ECU to control boost depending on load, engine speed, and other factors.
Also included in the scope of delivery is an adapter which, when installed, returns the vehicle to its original state without having to remove the cable harness of the dAHLer engine performance upgrade. This can be used, for example, at a workshop appointment.
With our Engine Performance Tuning Module all of the factory safeguards of your BMW Z4 Roadster M40i sDrive30i sDrive20i G29 remain in place, including overload protection and warm-up protocols to preserve longevity and factory drive-ability. One of the amazing advantages of this type of system is that it is unaffected by factory BMW updates and service.
If BMW updates the computer software of the BMW Z4 Roadster M40i sDrive30i sDrive20i G29 our Engine Performance Tuning Module is not lost or overwritten. This is where competitor tuning modules fall short! This is just another key aspect of our module because BMW is constantly releasing small software updates. All of the factory diagnostics and service access is retained.
The Performance Tuning Module is undetectable to plug-in diagnostic readers and it leaves no traces behind. A valet connector is included and installs in minutes to bypass the Engine Performance Tuning Module and revert the car to factory settings. With the valet plug installed the BMW engine computer will use the stock maps instead of getting modified data from the Engine Performance Tuning Module.
THE Z4 – BMW Z4 Roadster: Tuning Catalyst
Sound + / Power + / still legit
A 300 cpsi stainless steel tuning downpipe (catalytic converter) for the BMW Z4 Roadster M40i with OPF (gasoline particulate filter) can be combined with the BMW stock exhaust system as well as with the dAHLer engine tuning performance upgrade.
Read more - THE Z4 - BMW Z4 Roadster: Tuning Catalyst
A tuning catalyst will optimize the car’s performance while significantly improving the sound and power of the BMW Z4 Roadster M40i with OPF. Registration in the vehicle papers is not necessary as the downpipe comes with an ECE-Approval.
THE Z4 – BMW Z4 Roadster: Exhaust Flap/Valve Control
The dAHLer Exhaust Flap Controller Module for the Z4 Roadster M40i sDrive30i sDrive20i G29 was developed in Switzerland and manufactured in Germany and is a must have if you like to control the sound of your car.
Exhaust Flap Control
Our Exhaust Flap / Valve Control Module for the Z4 Roadster M40i sDrive30i sDrive20i G29 has one plug and one socket per exhaust flap. Installation is pretty simple. You pull out the original plug and connect it to the socket. The other plug is then connected to the socket on the exhaust flap and the connection is done.
As our Exhaust Flap / Valve Control Module operates as minimally in the vehicle as necessary, it does not does not leave an error message. When the Z4 Roadster M40i sDrive30i sDrive20i G29 goes to the BMW workshop for maintenance, no errors appear on the DIS machine.
The system has been checked and is it not causing any damage to the Z4 Roadster M40i sDrive30i sDrive20i G29. Each of our systems is individually checked for function after assembly and subjected to quality assurance. All Modules are made in Germany by a team of specialists at an ISO 9001:2015 certified facility.
Exhaust Flap / Valve Control Module for the Z4 Roadster M40i sDrive30i sDrive20i G29 is built to be safe from the ground up, so that it cannot interfere with the data bus, for example.
The Module is permanently resistant up to +80° C (176° F). As a rule, you don’t need any additional heat protection.
Exhaust Flap Controller Installation Video
THE Z4 – BMW Z4 Roadster: Performance Lowering Kit
Performance Lowering Springs are the first step in suspension performance enhancement. A dAHLer lowering kit for the BMW Z4 Roadster G29 is a performance spring set created for the serious enthusiast.
Read more: Lowering Kit
A sports spring set with the lowest possible drop but with the exceptional ride quality you expect from a high-class tuner like dAHLer.
Using progressive spring technology to lower the vehicle’s center of gravity.
This proprietary progressive design delivery, both a smooth softer initial spring rate for exceptional ride quality combined with a stiffer final rate for high performance handling of your BMW Z4 Roadster G29.
The benefits of a lower stance are many. Let’s begin with the performance advantages of a dAHLer sports spring set installed in your BMW Z4 Roadster G29.
A dAHLer lowering spring equipped BMW Z4 Roadster will exhibit reduced body roll in corners as well as reduce squat during acceleration and diminish nosedive under braking.
Another performance advantage that is often overlooked is the reduced drag coefficient. A dAHLer sports spring set for the BMW Z4 Roadster provides the ultimate balance between high performance, extreme lowering and comfortable ride quality.
THE Z4 – BMW Z4 Roadster: 21” Wheel Set
Complete 21” Wheel and Tire Package
Modern BMW cars like the BMW Z4 Roadster G29 typically come with these heavy stock alloy wheels. Even when you have spent lots of money on better BMW accessory wheel & tire packages, most of the people won’t recognize the difference as they simply think those wheels come from factory anyhow. It needs a real BMW enthusiast to tell the difference.
So, how to make a difference?
Read more - THE Z4 - BMW Z4 Roadster: 21’’ Wheel Sets
High-class dAHLer light alloy wheel and tire sets in 21 inches for your BMW Z4 Roadster G29 stand for innovation and individuality and therefore are dAHLer wheel and tire sets the perfect match and the complete solution for modern BMW cars such as the BMW Z4 Roadster G29 and the real enthusiast who likes to think individually.
So, give your BMW Z4 Roadster something to set apart from the crowd with a dAHLer 21 inch wheel and tire package.
dAHLer light alloy wheel and tire packages in 21 inches for your BMW Z4 Roadster are not only much more attractive than most of the heavy stock BMW alloy wheel and tire sets they are mostly lighter and therefore require less energy to rotate. dAHLer light alloy wheel and tire sets in 21 inches give you many performance advantages over the heavy stock BMW alloy wheel and tire packages, which contributes to a better handling, better acceleration, and better braking of your BMW Z4 Roadster G29.
You can find a large selection of colors in the category Wheel and Tires Sets
THE Z4 – BMW Z4 Roadster: Glass Wind Deflector
A dAHLer Glass Wind Deflector for your BMW Z4 Roadster G29 is from high-quality, made of 5 mm tempered safety glass and meets the highest demands in optics and fitting accuracy.
Read more - THE Z4 - BMW Z4 Roadster: Glass Wind Deflector
Made in Germany and approved by the German TUV.
The glass wind deflector is simply pushed into the original BMW Z4 Roadster holding devices and clicks into place.
In case of an accident our high-quality glass wind deflector would break into a thousand small pieces, just like all other series parts such as the windshield, side or rear window. So, you are still absolutely safe on the road with our glass wind deflector installed in your BMW Z4 Roadster G29.
Another advantage over the cheap plastic variants that are on the market is the fact that our glass wind deflector does not vibrate when the engine is running. For example, if you look in the rear- view mirror at the traffic lights, the view is absolutely clear. No flickering or similar annoyance.
Another safety aspect is the fact that our glass wind deflector for your BMW Z4 Roadster G29 still offers a very good view in the twilight. Even with the roof closed, our glass wind deflector does not restrict your view in any way.
THE Z4 – BMW Z4 Roadster: Floor Mats
dAHLer Floor Mats for BMW Z4 Roadster G29
Read more - THE Z4 - BMW Z4 Roadster: Floor Mats
dAHLer floor mats deluxe edition in black tuft velour
fiber material 100% polyamide, backing latex-fine-
profile for excellent grip, high-quality appearance
includes all necessary holders and attachment parts
The dAHLer floor mats give the vehicle an individual
sporty touch even in the foot area.
With Logo and lettering
Set consisting of:
Two floor mats front with dAHLer logo and lettering
Two floor mats rear
The vehicle type must be specified before ordering
For Left Hand Drive cars only
THE Z4 – BMW Z4 Roadster G29: Test Drive
dAHLer enhanced BMW Z4 Roadster M40i ( Cindy Allemann / professional driver)
We ship worldwide!
Give us a call or drop us an email to learn about what we can offer to customize your BMW Roadster.