Volvo B6324S Tuning

"All you need to know about tuning and performance parts on the Volvo B6324S engine!"

The Volvo B6324S make a good tuning project and with the ultimate parts like remaps, turbo upgrades and camshafts you will really maximise your driving opportunities.

Let us review and look at B6324S tuning and show the best upgrades.

History, Power & Specs of the B6324S Engine

This is a short inline 6 and actually took up less space than the 5 cylinder predecessor!

238 PS (175 kW; 235 hp) at 6200 rpm, and produces 320 Nm (236 lbft) of torque at 3200 rpm.


  • 2007–2014 Volvo XC90 badged as XC90 3.2
  • 2007–2010 Volvo S80 II badged as S80 3.2or S80 3.2 AWD
  • 2008–2010 Volvo V70 III badged as V70 3.2 or V70 3.2 AWD
  • 2008–2010 Volvo XC70 II badged as XC70 3.2
  • 2010 Volvo XC60 badged as XC60 3.2 AWD
  • Tuning the Volvo B6324S and best B6324S performance parts.

Best B6324S tuning mods

The greatest B6324S tuning mods on an engine are usually the ones that give the best value for money.

We won't be swayed by popular B6324S tuning mods, they need to be cost effective.

Altering your B6324S cam will make a dramatic difference to the engine torque. Choosing a higher performance cam profile raises the torque accordingly.

Fast road cams commonly increase the power throughout the rpm band, you could sacrifice a little low down torque but the higher rpm power will improve.

Competition cams, increase the higher rpm power band but as a result the car will not idle smoothly and low end power nearly always suffers.

A Motorsport cam won't do well if on the daily commute, because the lumpy idle will make the car prone to stall and smooth driving at low rpm becomes impossible. If you are developing a track car this doesn't matter as you are in the high end of your RPM range anyway and that is where you want the power to be.

You should ideally optimize your torque band to your typical driving style so for a car used daily stick with a shorter duration B6324S cam

Each engine responds better to different camshaft durations so view each engine as unique.

The ECU mapping and fuelling also will make differences on the torque gains you'll get.

A longer valve duration can alter the torque 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.

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Best Engine Mods for your car

  1. Engine Tunes - engine tuning/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.
  6. Typical stage 1 mods often include:
    drilled & smoothed airbox, Fast road camshaft, Sports exhaust header/manifold, Intake manifolds, Panel air filters, Remaps/piggy back ECU.

    Typical stage 2 mods often include:
    high flow fuel injectors, fuel pump upgrades, Sports catalyst & performance exhaust, Ported and polished head, Fast road cam, induction kit.

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

    Plan your options and then find your modifications and set yourself a power target to void expensive mistakes.

    Remaps helps unlock the full potential of all the upgrades you've done to your B6324S.

    (In some cases, as the factory ECU is locked flashing is not an option, so an aftermarket ECU is the route to take, and many of these will outperform factory ECU's but make sure it has knock protection and that you get it setup properly.)

    It will usually give you around 30% more power on turbocharged vehicles and you can expect to see around 15% on NA (naturally aspirated) engines, but figures achieved often differs on the upgrades you've carried out and the condition of your engine.

    It is vital to any car tuning project to push air into each cylinder

    Intake manifold take the air during the suck phase from the filter and allow it to be drawn into the engine cylinders with fuel for the squish phase.

    Shape and flow rate of the Air Intake manifolds can make a big change to fuel engine efficiency on the B6324S.

    We often see air intake manifolds are begging for an upgrade, although some manufacturers provide decently flowing air intake manifolds.

    Adding a B6324S larger valve kit, carrying out B6324S port enlargement and head flowing will also improve performance, this will give you a greater performance increase on other upgrades.

    B6324S Turbo upgrades

    NA (naturally aspirated) 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 significant power gains.

    When your car is turbo charged upgrades are going to net you a larger power gain and you'll see that turbocharged engines will have harder and stronger components.

    There are common areas of failure for every engine, with some being extremely strong and some just sufficiently able to handle stock powerIt is important to find these limitations and upgrade to higher quality components to handle the power.

    It's not unheard of people spending a loads on turbo charger upgrades on the B6324S only to watch the engine block go up in smoke on it's first outing after it's used on the roads.

    Bigger turbos tend to suffer a bottom end lag, and little turbos spool up more quickly but do not have the peak rpm torque gains.

    Thankfully the choice of turbos is always developing and we commonly find variable vane turbos, allowing the vane angle is altered according to speed to lower lag and increase top end bhp and torque.

    Twin scroll turbos divert the exhaust gases into 2 channels and direct these at differently profiled vanes in the turbocharger. They also improve the scavenging effect of the engine.

    It is not unusual that there's a restriction in the air flow sensor AFM/MAP on the B6324S when a lot more air is being pulled into the engine.

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

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


    Don't forget to boost the fuel delivery when you are increasing the torque - it makes the car more thirsty. It is important to be generous with your injectors flow rate.

    As a rule of thumb add 20% to the flow rate when specifying an injector, this takes into account injector deterioration and gives 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.

    All the following flywheel power targets will assume an injector duty cycle of 80% and a base of 58psi of fuel pressure at idle.

    4 Cylinder turbocharged engines

    • 58 PSI 340cc/min 200hp
    • 58 PSI 511cc/min 300hp
    • 58 PSI 682cc/min 400hp
    • 58 PSI 1022cc/min 600hp

    5 Cylinder turbocharged engines

    • 58 PSI 273cc/min 200hp
    • 58 PSI 409cc/min 300hp
    • 58 PSI 545cc/min 400hp
    • 58 PSI 818cc/min 600hp

    4 Cylinder NA (naturally aspirated) engines

    • 58 PSI 285cc/min 200hp
    • 58 PSI 426cc/min 300hp
    • 58 PSI 568cc/min 400hp
    • 58 PSI 853cc/min 600hp

    4 Cylinder supercharged engines

    • 58 PSI 312cc/min 200hp
    • 58 PSI 468cc/min 300hp
    • 58 PSI 625cc/min 400hp
    • 58 PSI 937cc/min 600hp

    B6324S Performance Exhausts

    You only need to improve your exhaust if your exhaust is actually causing a restriction in flow.

    On most factory exhausts you'll see your flow rate is still good 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 will certainly help air flow from the engine but avoid an exhaust that is too wide or you could very well end up with a reduced flow rate. So generally speaking, keep to 1.5 to 2.5 inches as a rule of thumb.

    Common exhaust restrictions are traced to the catalyst installed, so adding a faster flowing performance catalyst removes the restriction. We note that performance cats perform similarly to decats and have the added benefit of keeping your car street legal, as decats or catalyst removal is illegal in most territories for road going cars.

    Weak spots, Issues & problem areas on the B6324S

    The B6324S engines are generally reliable and solid units, as long as you follow the manufacturers service schedules, and use a good quality oil to ensure longevity. Few problems should happen as long as they are regularly serviced and maintained.

    Carbon build up in the head, particularly around the valves which will sap power or create flat spots, this is a larger issue on direct injection engines but should be looked out for on all engines. We have tips on removing carbon build up.

    Some of our members have had issues with flat spots or glitches after applying mods and upgrades or tuning, this is not usually related to this engines design, so instead see our article on diagnosing flat spots and problems after tuning which should help you get the bottom of this issue.

    Regular oil changes are vital on the B6324S, especially when tuned and will help extend the life and reliability of the engine.

    If you would like to know more, or just get some friendly advice on Tuning your B6324S engine please join us in our car forums where you can discuss B6324S tuning options in more detail with our B6324S owners. It would also be worth reading our unbiased Volvo tuning articles to get insights into each modification and how effective they will be for your car.

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