Tuning the BMW B6324S

"Comprehensive guide to tuning the BMW B6324S engine!"

We are regularly getting emails asking how to improve the B6324S from people wanting to know what are the best tips on B6324S power upgrades. So let us look into BMW B6324S parts and outline the best modifications on this great engine and point out some frequent tuning mistakes along the way.

The BMW B6324S make a good tuning project and with the best sports parts like a remap, turbo improvements and camshafts you will substantially enhance your driving opportunities.

Here we review B6324S tuning and point out the greatest modifications.

Just because particular parts are popular with B6324S owners it doesn't mean its worth having, we will best parts that will give your B6324S the best power gain for your spend.

The camshaft profile plays a big part in the engines power output so camshaft upgrades make quite a large difference. The intake and exhaust durations will alter depending on the chosen camshaft profile, so large engines power gains are on offer for camshaft upgrades.

NB: Fast road camshafts tend to increase the performance through the rev range, you may sacrifice a little low end bhp but the top end will be higher.

Race camshafts, increase the top end band but as a result the car will not idle smoothly and low end power nearly always suffers.

On a road car you need to match your power band to your typical driving style.

I'd be gobsmaked if you find a B6324S Competition cam is a pleasure to live with when driving in heavy traffic.

Some B6324S engines respond better to different cam durations so view each engine as unique.

The ecu map and fuelling also have an effect on the power gains you'll achieve.

Longer valve durations can alter the power band and on most engines the exhaust and intake durations do not need to match, although most cams and tuners use matched pairs there are some advantages to extending the intake or exhaust durations.

B6324S Best Tuning Mods & Upgrades

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Guide to the best tuning mods & Upgrades

  1. ECU Map Tuning & Remaps

    Some cars may require a piggyback ECU's or aftermarket ECU's to change the OEM map, but remapping is the most vital step of your tuning project to fully maximise your mods. Expect 10-20% on NASP engines and 30-40% on turbocharged units.

  2. Strengthen Your Engine

    Tuned cars will show up weaknesses, typically in the turbochargers, clutch and internal engine components. Whilst most engines can cope with mild tuning mods, TorqueCars recommend that you upgrade the internal components before these weak spots manifest themselves.

  3. Mods that Remove a Restriction

    A restricted intake or exhaust will have an impact on your performance, so use a better flowing air filter/induction kit and better flowing exhaust (sports cats where legal are a good option) whenever your tuning creates a flow restriction. Turbo engines also benefit from intercooler upgrades as these resist heat soak for longer periods of time.

  4. Mods that Improve Fuelling

    Every tuning project will aim to increase the air supply, but fuel supply is just as vital and will need to match the air the engine can utilise,  a fuel pump and injector upgrade are usual mods, but also in many cases the fuel regulator will need improvement.

  5. Mods to Provide better Airflow

    Increasing the air supply is just as essential as improving fuelling, we suggest you look at head mods (flowing and porting, 5 angle valve jobs), fit bigger valves, fast road cams and forced induction upgrades (adding a better flowing turbo) to improve air intake.

Tuning Stages

Stage 1 B6324S modifications: Sports exhaust manifold, Remaps/piggy back ECU, Intake headers, Fast road camshaft, Panel air filters, Drilled & smoothed airbox.

Stage 2 B6324S modifications: fuel pump upgrades, Sports catalyst & performance exhaust, high flow fuel injectors, induction kit, Ported and polished head, Fast road cam.

Stage 3 B6324S modifications: Internal engine upgrades (head flowing porting/bigger valves), Adding or Upgrading forced induction (turbo/supercharger), Twin charging conversions, Crank and Piston upgrades to alter compression, Competition cam, Engine balancing & blueprinting.

The B6324S power trains are fantastic to work on and thankfully there are plenty of upgrades and performance parts around.

ECU mapping will help to establish the full potential of all the mods you've done to your B6324S.

It will usually give around 30% more power on turbocharged vehicles and you can expect to see around 15% on NASP engines, but figures achieved usually vary depending on the mods you've carried out and the condition of your engine.

It is the whole point to any engine tuning job to shove more air and fuel into the B6324S engine

Intake manifold take the air during the suck phase from the air cleaner and allow it to be fed into the engine cylinders.

The bore size, shape and flow characteristics of the Air Intake manifolds can make a substantial improvement to fuel atomisation and engine efficiency on the B6324S.

I usually find air intake manifolds are begging for a performance upgrade, although a few manufacturers provide decently flowing air intake manifolds.

Adding a B6324S larger valve kit, doing a bit of B6324S port enlargement and head flowing will also lift performance, the fantastic side effect is it will permit a better performance increase on other parts.

Turbo upgrades for the B6324S

NASP engines need quite a lot of work when you add a turbo, so we have a separate guide to help you take into account the pros and cons of going this route on your B6324S

The more air you can get into an engine, the more fuel it can burn and uprating the induction with a turbocharger upgrade makes excellent power gains.

When the engine is fitted with a turbocharger parts are giving better power gains and you'll see that turbo charged engines will have strengthened components.

However you'll find engines have weakspots

We recommend you find these limits and upgrade to stronger pistons, crank and engine components to survive the power.

It's not unheard of drivers spending a loads of money on turbocharger upgrades on the B6324S only to suffer the humiliation of seeing the motor explode on it's first outing after it's used in anger.

Larger capacity turbo chargers will usually experience low end lag, and small turbo chargers spool up quickly but won't have the peak end bhp gains.

In the last 10 years the selection of turbochargers is always moving on and we commonly find variable vane turbochargers, allowing the vane profile is altered according to speed to lower lag and increase top end bhp.

Twin scroll turbochargers divert the exhaust gases into two channels and direct these at differently profiled vanes in the turbo. They also boost the scavenging effect of the engine.

It is not unusual that there is a limit in the air flow sensor MAF/MAP on the B6324S when loads more air is being sucked into the engine.

We see 4 bar air sensors coping with quite large power gains, whereas the OEM air sensor was restricting performance at a much lower level.

Adding a supercharger or additional turbo will make large bhp and torque gains, although more complex to get working. We have this article covering twinchargers if you want to read more.

Uprating B6324S fuel injectors

When you improve the performance you will need to pay attention to to the fuel system.

More performance needs more fuel. We strongly recommend you to be generous with your flow rate on the injectors.

The accepted safe increase is to add 20% when buying an injector, this allows for injector deterioration and allows you some spare capacity should the engine require more fuel.

We think this one is common sense, but you'll need to match your fuel injector to the type of fuel your car uses as well.

Best B6324S performance exhausts

You only need to to replace your exhaust if your current exhaust is actually causing a flow problem.

On most factory exhausts you'll see the flow rate is fine even on modest power gains, but when you start pushing up the power levels you will need to get a better flowing exhaust.

Sports exhausts can usually air flow out of the engine but do not go too large or you could will reduce the flow rate. Stick to 1.5 to 2.5 inches for best results.

Common exhaust restrictions can be traced to the catalyst installed, so adding a better flowing sports alternative will help avoid this restriction.

Problems and issues to look out for on the B6324S

The B6324S engines, if regularly serviced and maintained, are generally very reliable and have few issues.

Regular oil changes are vital on the B6324S, particularly when the engine has been modified and is putting down more power than the manufacturer intended.

For more information on Tuning your B6324S engine please join us in our friendly forum where you can discuss tuning options in more detail with our B6324S owners. It would also be worth reading our unbiased tuning articles to get a full grasp of the benefits and drawbacks of each modification.

We need your help to complete and improve this page, so do give us your feedback in the comments box below.

We really like hearing from our readers, and hearing about which parts were the most effective for them, it helps us improve our recommendations and articles to reflect current trends in modifications and ensures that our B6324S guides and tips are kept up to date.

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