Tuning the Popular BMW 3 Series.

"BMW 3 series tuning."

The BMW 3 series was first launched in 1975 with the E21, however it was not until 1982 the 3 series became a success with the E30.

In particular the "Ultimate Driving Machine" really kicked things off in 1985 with the E30 M3 which was produced as a race car for the road.

This was because BMW wanted to compete in touring car racing.

After this success, 3 more successful generations have followed.

Many people get confused at the version numbers offered in the 3 series range, so we've pulled together all of the model designations and years here for reference, and noted significant changes to the 3 series over the years.

One of the most popular model ranges BMW have produced and it led to many spin off models, such as the M3 and M4 and Z series models shared the platform with some 3 series models.

First generation 3 Series

(E21; 1975–1983)

We saw fuel injection used from 1975 and in 77, some 6 cylinder engines were added.

  • 1.6-2.0 L M10 I4
  • 2.0-2.3 L M20 I6

Second generation 3 Series

(E30; 1982–1994)

Came in saloon and Estate body versions. The Z1 roadster shares the E30 platform, giving an idea of the potential from this chassis, with the right mods.

  • 1.6-2.5 L M10/M40/M42 I4
  • 2.0-2.5 L S14 I4
  • 2.0-2.7 L M20 I6


  • 2.4 L M21 I6

Third generation 3 Series

(E36; 1990–2000)

A coupe version was added and the E36 won many car of the year awards during it's production run, thanks in part to the revised multi link rear suspension. The Z3 roadster was based on this platform.


Fourth generation 3 Series

(E46; 1997–2006)

All wheel drive was offered in the E46, a great setup that really improves the wet weather performance of the 3 series range. We also saw valvetronic introduced on the engines, BMW's take on variable valve lift and durations.


  • 2.0 L M47 I4
  • 2.9–3.0 L M57 I6

Fifth generation 3 Series

(E90/E91/E92/E93; 2004–2013)

A cabriolet version was offered. In 2006, we saw a turbocharged version in the form of the stunning 335i - our car of the year 2021. By the 5th generation we see the annoying run flat tires becoming standard across the range.



  • 2.0 L turbocharged M47/N47 I4
  • 3.0 L turbocharged M57/N57 I6

Sixth generation 3 Series

(F30/F31/F34; 2011–2018)

Turbocharged engines were introduced across the range along with a plug in hybrid version.


Seventh generation 3 Series

(G20; 2018–present)

  • 2.0 L turbocharged B48 I4
  • 3.0 L turbocharged B58 I6
  • 3.0 L twin-turbocharged S58 I6

Plug-in hybrid:

  • 2.0 L turbocharged B48B20 I4 with 50 kW electric motor


  • 2.0 L turbocharged B47 I4
  • 3.0 L turbocharged B57 I6

3 Series Handling/Suspension upgrades

Handling modifications are usually your first port of call for the 3 series.

We found that most 3 series factory suspension setups need tweaking, a few degrees of toe (set some toe out to improve cornering or use toe in for better stability) and you only need around 1 to 2 degrees, and slight negative camber will often improve your cornering and handling.

We would go to a maximum drop of 23mm - 43 mm. on most models. You risk compromising your handling if you go lower than this.

Anti-roll bars are also a great way of improving how the car handles as chassis roll is reduced through hard cornering.

Adjustable setups are available and are very useful if the car is used both on the road and on the track. Strut braces are an easy modification that helps reduce chassis flex. Front and rear strut braces will ensure the car stays stable at top speed.

An important part of any project is making the sure the car stops. Luckily BMWs allow you to swap parts from other BMWs to create a bigger, better setup.

An example of this is an E46 330i brakes being applied to an E36. Just make sure the correct master cylinder and servo are used otherwise the middle pedal won’t do anything! If you want serious brakes though, many setups are available.

Grooved and drilled discs are a good idea to stop brake fade and allow up rated cooling.

These characteristics are key to track cars, but may be too much for a daily drive car as brakes may not reach optimum temperature quick enough. Brake pads are also important and should be chosen wisely depending on what the car is used for.

Using a pad designed for track use may not be best for road use and visa-versa. A simple but effective way to improve braking is to install a set of stainless steel brake lines. These reduce any flex in the lines and don’t corrode like OEM ones do. This will improve the feel of the brakes in any setup.

Putting meatier brake discs and better performance pads should make for greatly improved stopping.

BMWs naturally have very good suspension, especially thanks to the 50:50 weight distribution found throughout the range.


Tuning tips and articles

Engine tuning Transmission tuning Care care Intake & exhaust mods Improve handling Forums


But any suspension setup can be improved upon. A good start to a suspension overhaul would be to install a set of adjustable coil overs. These are available in many varieties from eBay specials to high end track setups.

You will find that older BMWs need more work to get the most of out of them as parts have endured more wear and tear due to their life span.

In particular pay attention to the bushes. The better the bushes, the stiffer the ride will be. Powerflex provide a great range of polyurethane bushes (poly bushes) for all BMWs that will stiffen up the ride and help handling.

When installing coil overs, be sure to go for some adjustable top mounts as well.

This will help you gain camber and castor. Generally the lower the better, however some models require a sump guard if you intend to go extremely low.

If ride comfort is paramount to your everyday journey then we recommend you go for a set of lowering springs instead as a coil over setup can be quite stiff.

Stunning handling and a great range of engines clearly mark the 3 series BMW out from the competition as a drivers car.

BMW 3 Series Tuning

Now we come to the exciting part of any BMW 3 Series project, more power!

These are the upgrades are usually carried out by our members, decide how far you want to push your car before you get going.

Getting the right sports upgrade kits for your planned usage of the car is a time and money saver. Stage 3 (competition) mods just don't work well on the road making the car difficult to drive.

Please watch our video which covers the 5 principles of tuning your car. Be sure to subscribe and support our new channel.

Best mods for your car

  1. Mapping - remapping provides the most advantage in terms of cost savings,  aftermarket ECUs, and piggyback ECUs are all alternatives.
  2. Fast road cams are one of the most significant mechanical changes, but they must be installed by someone who knows what they're doing and they are not always easy to source but you might find a local firm to regrind a stock camshaft.
  3. Intake and Exhaust - Note that on their own these mods will NOT ADD POWER in most cases, but they can help enhance power after other mods by removing the restriction.
  4. Upgrades to turbochargers and superchargers - forced induction is the most efficient approach to increase air supply, allowing you to burn more fuel and make more power. It is one of the most costly upgrades but provides the best gains.
  5. Head work - The goals of porting and flowing the head are to get air flowing into the engine while removing flow restrictions and turbulence.

Typical stage 1 mods often include: Panel air filter, Alloy wheels, Sports exhaust, Remap, Lighter flywheel, Suspension upgrade (drop 23mm - 43 mm.).

Typical stage 2 mods often include: high flow fuel injector, Ported and polished head, Power/Sport clutch, Fast road cam, fuel pump upgrades.

Typical stage 3 mods often include: Engine balancing, Sports gearbox, Competition cam, Adding or upgrading forced induction (turbo/supercharger), Internal engine upgrades (pistons/head/valves).

Peak power is nice in motorsport but for a drivable and fun car you need a wide torque band and perhaps extending the rev range.

The aim of our guides is to give a starting base of car tuning mods and point you in the right direction, our forum is the place to go for detailed advice and tips on your modified car project, the best motorsport upgrades and all aspects of modding cars. Fast road cams offer one of the biggest torque gains for your money as far as a solitary sports modifications goes on a NASP engine.

It improves the intake and exhaust durations and pushes up the power if done right. Ideally you'd add other mods and finish up with a reflashed ECU. We'd also caution you not to go with a competition cam as this affects the engines idling and general town driving characteristics.

You will need to ensure that the engine is not starved of fuel so will need to uprate the fuelling.

Most power losses, and erratic idling after motorsport parts are done can usually be traced to timing or fuelling issues. Improved injectors will enable you to supply sufficient fuel to the engine.

If have increased your fuelling with bigger injectors you will also need to get a bigger fuel pump to supply it.

3 Series Intake and Exhaust Tuning.

The next area for modification is the intake and exhaust. 

Please note that WE DO NOT RECOMMEND INDUCTION KITS, unless you have tuned your car extensively and are finding that the standard air intake has become a restriction.

Exhaust systems are an effective way of increasing throttle response and adding a few extra horses. Pipe diameter is the key element in choosing your exhaust system. The right size for an M3 will no doubt be too big for a smaller powered version.

BMW 3 series engine

For example, the optimum exhaust size for a 318is is 2.25 inches, but the M3 uses a 3 inch diameter. This is to achieve the best flow rate vs back pressure.

Induction kits can achieve good power gains across the range where you've increase power significantly already, but be sure to use a heat shield around enclosed filter as heat soak mean a loss in power.

However, smaller engines can achieve similar gains with just a panel filter. Throttle bodies are also an important part of adding power to your 3 Series.

Big bore throttle bodies (BBTBs) or individual throttle bodies (ITBs) help deliver more power and a better throttle response to your BMW. Once you’ve finished with your power modifications then make sure to take advantage by getting a remap done.

This will ensure that there no flat spots meaning drivability is at it’s best and power is increased further. Don’t be put off if you have a smaller engined BMW, as good gains are available for most engines, especially diesels. If that isn’t enough for you then a turbo or supercharger may be the route to take.

Styling is possibly the most enjoyable part of a 3 Series project.

There are so many parts to choose from you will spend hours looking and planning.

Non-Mtec models may benefit from an Mtec conversion and Mtec models may be inspired by many aftermarket manufacturers such as Hartge, Alpina and AC Schnitzer.

The biggest choice you will make during your 3 Series project is what wheels to go for.

TorqueCars recommends going for lightweight wheels to maximise performance. This means avoiding replica wheels as they are usually heavier than standard wheels.

Due to the fact that alloys are less heavy they improve performance and they can help to cool the brake disks.

Get a good directional tread pattern tire to improve your handling and help improve traction on your 3 series.

Large 3 series alloys can decrease performance. If you get big alloys you will be changing your final drive ratio.

Because of this try to keep the overall rolling diameter of the wheel your OEM settings. In all cases we do not recommend going above 18 inches.

A common wheel choice is to put 5 Series rims onto a 3 Series. If you choose this route then make sure a spigot ring is used to reduce centre bore size. Otherwise you will endure wheel wobble.

BMW 3 series

To ensure you choose a good base for your project be sure to check the rear arches for rust as replacements will be expensive.

Other areas to check are the wiring contained within the boot harness as wear and tear can cause electrical problems, the Nikasil issue found with Nickel lined alloy blocks, exhaust manifolds and if equipped, VANOS.

If you would like to know more, or just get some friendly advice on Tuning your car please join us in our friendly forum where you can discuss 3 series options in more detail with our 3 series owners. It would also be worth reading our unbiased BMW tuning articles to get a full grasp of the benefits and drawbacks of each modification.

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