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A Stage 1 remap takes an F20 LCI M135i from 326PS and 450Nm to around 390PS and 525Nm on our rolling road, and the earlier 320PS F20 car to about 385PS and 520Nm. The M235i, which is the same running gear in the F22, goes from 326PS to around 380PS and 520Nm. The later F40 M135i, which is a four-cylinder and front-biased rather than the straight-six, goes from 306PS to about 345PS and 540Nm. All of it is software only, with the standard turbo, exhaust and catalyst kept.
BMW M135i & M235i TUNING
F2x (2013 - 2021)
We’ve put together an exceptional lineup of upgrades for the BMW M135i & M235i F2x, focusing on boosting engine performance, improving braking systems, enhancing handling, and adding some stylish cosmetic touches.
BMW M135i & M235i F2x Stock Results
The BMW M135i & M235i F2x are known for their impressive performance from the factory and they both come equipped with a 3.0 litre inline-six engine, producing 320 BHP and 450 Nm of torque. The M135i F20 boasts a 0-60 mph time of just 4.9 seconds, while the M235i F22 is even quicker at 4.8 seconds.
These models also feature a rear-wheel-drive layout, ensuring a thrilling driving experience, and their agile handling, precise steering, and robust braking systems make them favourites among driving enthusiasts.
Both cars deliver exceptional performance and reliability, making them popular choices for those seeking a perfect blend of power and everyday usability.
SELECT A STAGE...
BMW M135i & M235i F2x Engine Tuning Options
JFA Stage 1 Tune for BMW M135i & M235i F2x: Enhanced Power and Torque with Peace of Mind
Our Recommended
Our Stage 1 upgrade for the BMW M135i & M235i F2x turbocharged engines boosts power and torque significantly through meticulously re-tuning the BMW’s ECU. This is a bespoke map that is uploaded to the ECU but we can revert it back to its original file at any time!
Our tunes are rigorously tested on our 2000 BHP Mustang 4WD Linked Dyno, ensuring top-tier calibration. Unlike many other tuners our tune is specifically tailored to each and every BMW M135i or M235i, we are able to achieve this as we write our own files in house. Which also means that the car can be returned to its standard settings at any time by re-uploading the original file. This tailored approach guarantees the best performance enhancement for your vehicle.
We provide a 30 day money back guarantee along with lifetime support to ensure our customer have peace of mind when purchasing from us. All our software is written in house. Yes our software achieves the highest possible numbers but engine safety is still our main priority.
Alternatives
Boost Your BMW with the JFA Speed Buster Module: Enhanced Performance and Reliability
Our JFA Speed-Buster Tuning Module enhances your driving experience while safely boosting the performance of the M135i and M235i. It guarantees more power, precision, and reliability, and each module is custom-made for your BMW.
Also, our Plug & Play system is very easy to use and the installation takes only a few minutes, although expert installation is available at our UK-based facility if you prefer.
Additionally, the JFA Speed-Buster signifies quality as our product development and manufacturing take place in Germany. Unlike many competitors who outsource to cut costs, our commitment to high standards allows us to offer superior products worldwide. Lastly, this module comes with a 30-day money-back guarantee and a 2-year warranty.
BMW M135i & M235i F2x Stage 1 Tuning Results
Please note this dyno graph shows raw data measured at the wheels. Our system then calculates drivetrain losses to produce engine power figures.
We are able to boost the BMW M135i & M235i F2x power significantly with our JFA Stage 1 Tune, bringing it’s numbers to 390 BHP and 525 Nm of torque, enhancing these models drivability.
This tune also enhance throttle response time, ensuring our customers are able to have the best driving experience.
Tuning Options
FAQ's
Coming soon…
Motorsport-exclusive components are explicitly designed for track use. While they can be installed on any vehicle, it’s important to note that using such parts renders the vehicle unsuitable for road use and may result in MOT failure.
No! Our remaps are designed specifically to improve the performance of your vehicle whilst remaining within the tolerances of your vehicles’ components.
Sadly, in attempt to achieve ‘big numbers’ some other companies over tune engines, placing excessive stress on the engine, transmission, cooling systems, etc, leading to reduced life span and reliability of the vehicle. We pride ourselves in producing reliable remaps which do not over stress your vehicle but still produce impressive results.
In any case where a customer is dissatisfied with any ecu remap software supplied, within thirty days of the supply date, the customer can request their money back. In order for any refund to be processed, the customer must present their vehicle to our workshop and allow our technicians to restore the vehicle to its original state. On successful completion JF Automotive will refund the cost of the remap to the customer.
No refund can be granted unless the vehicle is returned to the original state by JF Automotive. The 30-day money back guarantee only applies to stage 1 remaps and does not apply to other services like pops and bangs, parts or dyno sessions.
If another modification is purchased alongside a tuning file, which relies on a remap to operate, only the cost of the file is covered by this guarantee. We reserve the right to withdraw this 30 day money back guarantee.
Absolutely. We offer this service free of charge if the vehicle is brought back to us. We’ll be very surprised if that’s what you want after taking one of our remap products, however in the case of lease cars some customers prefer to put the car back to standard before returning the car. You might want it back to standard if you are visiting a dealer for warranty or service work, again we will do this for free. Should you lose your tuning files due to dealer actions or parts failure we will be happy to re-install the map onto your car free of charge where possible.
No problem, simply bring the vehicle back in and we will take a fresh read of your ECU and write you a new map file free of charge. We offer this as part of our lifetime software support.
Whilst the remap is undetectable to dealer equipment, you should notify your insurance company of any modification to your vehicle. Many insurance companies do not penalise you for upgrades of this nature, particularly if you’re tuning for increased economy however a failure to disclose modifications may invalidate your policy. You may wish to enquire with your insurer if the modification will affect your policy prior to choosing one of our services.
We get asked, “Why do some tuners charge as little as £150?” There are a few factors as to why we do not offer remapping for £100-£200!
We supply custom written files for each vehicle that we remap that take in to account condition, milage and customer request of each vehicle. Our services are fully insured with a 30-day money back guarantee and lifetime support for the tuning software supplied. We constantly invest in the most up to date tuning and diagnostic equipment and software and we offer a quality service to all our customers.
Overall our custom supplied tuning software is of the highest standard that we know of, so if you want the best of the best, choose JF Automotive.
Questions we get asked
How much power does an M135i Stage 1 make?
326 to around 390PS and 525Nm on the F20 LCI (2015 to 2019), and 320 to around 385PS and 520Nm on the earlier F20. On the four-cylinder F40 M135i it is 306 to around 345PS and 540Nm. Those are our own dyno figures, not a supplier's estimate.
What does Stage 2 need on an M135i?
A downpipe with a sports cat, and ideally an intercooler and intake, then a file written around what you have fitted. The hardware on its own is worth very little; almost all of the gain comes from the map that follows it. Send us the list of what is on the car and we will tell you what it will make.
Is the M135i quicker after a remap?
Yes, and noticeably so in the mid range rather than only at the top. The factory 0 to 62mph figure improves, but what owners comment on is the way it pulls from 2,500rpm in a higher gear. We can put it on the dyno before and after so you have the graph.
Is the M235i the same as the M135i?
Mechanically, near enough. Both use the same straight-six turbo and the same 326PS state of tune in the F2x cars, in different bodies. They tune identically and to the same figures.
Do I need the gearbox tuned too?
Not for Stage 1. These cars use the ZF 8HP automatic, which has its own torque limiter. At Stage 2 the limiter starts clipping what the engine makes, so the gearbox tune pays for itself, and it also gives faster shifts and a manual mode that holds a gear.
Will it still pass an MOT?
Stage 1 changes no hardware at all, so the car keeps its catalyst and every emissions component and stays MOT-ready and road legal. We keep your original file so it can go back to standard at any point.
