Mercedes A35 AMG W177 Tuning Guide

The Mercedes AMG A35 and CLA35, both powered by the 2.0-litre turbocharged engine, are formidable performance vehicles straight from the factory. With their all-wheel-drive systems, rapid acceleration, and excellent handling, these cars offer an enjoyable driving experience as standard. However, for those looking to elevate their cars further, tuning is a popular avenue for increasing performance or enhancing the driving experience. In this tuning guide, we’ll explore the considerations to keep in mind when modifying the A35 or CLA35, and what kind of upgrades can be worthwhile.

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Powertrain and Performance Tuning

The 2.0-litre turbocharged engine in both the A35 and CLA35 is a well-engineered unit, producing around 302 bhp and 400 Nm of torque. While many enthusiasts seek increased power, it's important to note that tuning these vehicles to a very high level can come with risks. Some owners have experienced issues with the cylinder heads after tuning, particularly when opting for aggressive "stage tuning" packages that push the engine’s limits. This has made "Stage 1" or "Stage 2" tuning less popular among A35 and CLA35 owners, as it can lead to long-term reliability issues, especially if the modifications are not carried out properly or if the car is pushed beyond its design limits.

Tuning Options

For those still interested in boosting performance, a more measured approach to tuning is advisable. Many owners opt for more incremental modifications that can improve driving dynamics without causing undue strain on the engine:

• ECU Remapping (Stage 1): A relatively safe and cost-effective tuning option is ECU remapping. By altering the car’s software, a remap can increase power by refining engine parameters, particularly boosting turbo boost pressure and adjusting fuel mapping. A good quality remap can result in noticeable improvements in power and throttle response, without the need for significant hardware upgrades.
• Intercooler and Cooling Mods: If you're looking for reliability while increasing power, improving cooling systems can be a good route. An upgraded intercooler or better radiator helps manage the heat generated by increased performance, ensuring the engine stays within safe operating temperatures. 

Modifications for Sound and Experience

While tuning for massive power gains might be a riskier avenue, many owners focus on modifications that enhance the driving experience, without compromising reliability. Some popular modifications for the A35 and CLA35 are designed to make the car sound better, feel more responsive, or look sportier.

Exhaust System

Upgrading the exhaust is one of the most common modifications for the A35 and CLA35. A new exhaust system can improve the engine's sound, making it more aggressive or refined, depending on the choice of parts. Many aftermarket systems not only enhance the exhaust note but also reduce weight and potentially improve performance slightly by reducing backpressure. The benefits are mainly in the sound, making the driving experience more engaging, without needing to push the engine too hard.

For those after a more sporty exhaust note, options such as valve-controlled exhaust systems allow owners to switch between a quieter setup for everyday driving and a louder, more aggressive sound when the mood strikes.

Shop A35 Exhausts here | Shop CLA35 Exhausts here

Induction Kit

Another popular modification is the induction kit. Aftermarket air intakes or induction kits can improve airflow to the engine, potentially enhancing turbo noises and throttle response. This modification is particularly attractive for those who enjoy the characteristic "whoosh" or "whistle" sound of the turbo. While this can slightly improve engine efficiency, it's generally a relatively low-risk modification when it comes to engine health and reliability.

Shop A35 Intakes here | Shop CLA35 Intakes here

Upgraded Filters

Alongside induction kits, upgrading the air filter is a simple way to ensure the engine is receiving optimal airflow. High-flow filters allow more air into the engine, improving performance slightly and enhancing the engine sound. However, the gains are minimal compared to more intensive tuning options, making this an ideal option for those who want to tweak their car without a huge investment. JXL Performance recommends the K&N Performance Replacement Air Filter for A35 and CLA35

Exterior and Aesthetic Modifications

The A35 and CLA35 are already sharp-looking cars, but many owners enjoy giving their cars a personal touch with a range of exterior modifications. These mods not only improve the visual appeal but can also increase aerodynamic performance if done properly.

Aero Kits

For a sportier and more aggressive appearance, owners often turn to AMG aero kits, which include front splitters, side skirts, and rear diffusers. These kits enhance the car’s stance and can provide some minor aerodynamic benefits. While they may not drastically change performance, the added visual impact can make the car look even more dynamic and unique.

Shop A35 Exterior Parts | Shop CLA35 Exterior Parts

Wheel Upgrades

Upgrading the wheels is another aesthetic modification that's both functional and stylish. Lighter alloy wheels can improve the car’s overall handling by reducing unsprung weight, and choosing a wider set of tyres can improve grip. Additionally, bespoke wheel designs can help personalise the car’s appearance, making it stand out on the road.

Suspension Lowering Kits

If you’re looking to improve the car’s stance and handling, suspension lowering kits can be an option. These kits lower the car’s ride height, giving it a more aggressive look and potentially improving handling by lowering the centre of gravity. However, it’s important to balance aesthetic goals with practicality, as lowering the car too much could impact ride comfort or scraping on speed bumps.

Shop A35 Suspension here | Shop CLA35 Suspension here

Final Considerations

When tuning a Mercedes AMG A35 or CLA35, it's important to strike the right balance between performance, reliability, and personal enjoyment. While extreme power upgrades like Stage 2 or 3 tuning packages can offer big gains, they can also strain the engine and components, particularly the cylinder head, leading to potential long-term issues. As such, many owners prefer more manageable mods, such as a better exhaust system, induction kit, or aesthetic changes, which enhance the driving experience without sacrificing reliability.

It’s crucial to work with a reputable tuner who understands the specific needs of the A35/CLA35 to ensure any upgrades are done safely and in line with the car’s limits. Always consider the impact of modifications on your warranty, insurance, and overall vehicle value, and remember that subtle tweaks can sometimes have the most rewarding results.