Modding uprating the Volvo B6304T2 engine!

Modifying and improving: "B6304T2 Modifications"

B6304T2 Modifications Guide

How to modify and upgrade the Volvo B6304T2

"Comprehensive guide to performance parts and tuning the Volvo B6304T2 engine!"

TorqueCars are always getting emails asking how to improve the B6304T2 from people inquiring about getting more power from the B6304T2 and wanting to know what are the things tuners recommend when it comes to B6304T2 mods that work. So let us look into Volvo B6304T2 upgrades and outline the best mods that work on this great engine and point out some potential pitfalls along the way.

The Volvo B6304T2 make awesome project engines and with the best modified upgrades like remapping, turbo improvements and camshafts you will definitely improve your driving pleasure.

Here we examine the options for your B6304T2 tuning and highlight the premier modifications.

When talking about the best parts for your B6304T2 engine, we are going to focus on the tuning mods that give the biggest return for your cash.

B6304T2 induction kits

Improving air intake on the B6304T2

You need air matched to fuel for an engine to work. If there is not enough fuel then it will run lean, if there is a lack of air it runs rich losing power which risks damage to the B6304T2. We'll pick up on fuelling later in this article but for now we shall look at air supply.

So Feeding air and fuel into your B6304T2 is the whole point to any performance tuning job.

It is not unusual that there's a limit in the air flow sensor AFM/MAF on the B6304T2 when loads more air is being pulled into the engine.

You'll see that 4 bar air sensors coping with quite large power gains, whereas the OEM air sensor limited power at a much lower level.

Air Intake manifolds transmit the air from the filter and allow it to be fed into the engine cylinders.

Shape and flow rate of the Air Intake manifolds can make a noticeable improvement to fuel engine efficiency on the B6304T2.

We often see intake manifold are in desperate need of an upgrade, although a few makers provide decently flowing intake manifold.

Adding a B6304T2 larger valve kit, carrying out port work and head flowing will also improve torque, and more importantly will make space for an improved torque increase on other mods.

B6304T2 performance cam tips.

Each engine responds better to more or less aggressive cam durations than others.

The engine timing and fuel pump and injectors also have a large bearing on the torque gains you'll hit.

Longer valve durations 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.

Altering your B6304T2 camshaft will make a dramatic difference to the engine engines power. Choosing a higher performance camshaft profile raises the engines power accordingly.

NB: Fast road cams usually boost the torque over the rpm range, you might lose a little bottom end bhp but your top end will improve.

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

In a road car you need to optimize your torque band to your cars usage.

You'll never have found a B6304T2 Race camshaft is a pleasure to live with when in heavy traffic.

Stage 1, 2 and 3 mods for the B6304T2

Stage 1 B6304T2 parts:

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

Stage 2 B6304T2 parts:

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

Stage 3 B6304T2 parts:

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

The B6304T2 engines respond well to upgrades and we're pleased to see that there are plenty of mods and tuning parts around.

A remap will help release the full potential of all the parts you've done to your B6304T2.

You will typically expect to see gains of approximately 20-30% more power on turbocharged vehicles and you can expect to see around 15% on NASP engines, but your mileage will differs on the parts you've fitted and the condition of your engine.

Tuning tips and articles Engine tuning Transmission tuning Care care Intake & exhaust mods Improve handling Forums

Turbo modifications on the B6304T2

To get a turbo working on a NASP engine there is a lot involved, from lowering compression ratio to improved fuel supply and mapping, so we have found a great guide to helpavoid the common pitfalls or end up with an unfinished project because you were not told what you were getting into by doing this on the B6304T2.

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.

If the engine is turbocharged, modifications are going to make more power and we find turbo charged engines are made with many forged and stronger components.

There are tuning limits for every engine, with some being extremely strong and some just sufficiently able to handle stock power

See where you'll find these limitations and install better quality components to handle the power.

We've seen car owners spending a a stack of money on turbo upgrades on the B6304T2 only to see the whole thing literally blow up when it's completed.

Big turbos commonly experience low end lag, and small turbos spool up quickly but won't have the high rpm power band gains.

Over the last 20 years the choice of turbo units is always increasing and we are seeing variable vane turbo units, where the vane angle is altered according to speed to lower lag and increase top end torque.

Twin scroll turbo units divert the exhaust gases into a couple of channels and flow these at differently profiled vanes in the turbocharger. They also boost the scavenging effect of the engine.

Beefing up the air intake by adding a supercharger or additional turbo will help you achieve very large bhp gains, although more challenging to install. We have this in depth look at twinchargers if you want to read more.

Tips about fuel supply on the B6304T2

You will need to ensure that the engine is not starved of fuel so must pay attention to the fuelling when you start exceeding 20% of a bhp and torque hike. At this point we flag up the need to over specify your flow rate on the injectors.

The rule of thumb is to add 15% to the flow rate when buying an injector, helps cope with injector deterioration and affords you some spare capacity should the engine require more fuel.

Don't forget that different fuel grades will usually require different settings, a high octane fuel will burn more efficiently than lower octane fuel for example. A car will trim fuel supply to keep within the ideal air fuel mix but at the extreme ends you may need to adjust your injector capacity, or the mapping or you'll get flat spots and potential lean or rich fuel issues..

Recommended B6304T2 performance exhaust upgrades

The only time you should look to improve your exhaust system with an upgraded one is if the current exhaust is actually causing a restriction in flow.

On most factory exhausts you should find that the flow rate is fine even on modest power gains, but on a serious tuning project with a big boost in power you will certainly need to get a better flowing exhaust.

Sports exhausts generally help improve air flow from the engine but do not go too large or you may end up will reduce the flow rate. Stick to one and a half to two and half inches for best results.

The usual suspects causing problems in your exhaust flow rate are traced to the filters installed, so adding a higher flowing sports alternative will help avoid this restriction.

Decats (NB:catalysts reduce harmful engine emissions) is illegal in most countries and regions.

Faults issues and things to look out for on the B6304T2

Like most engines an B6304T2, should have few issues if it gets properly serviced and looked after.

We cannot stress enough the need for oil changes with the correct grade of oil on the B6304T2, failure to do this will exacerbate engine wear, on a tuned B6304T2 this is more important than ever and close attention should be paid to your maintenance schedule.

If you are interested in learning more or getting impartial tuning advice for your B6304T2 why not pop over to the forums at TorqueCars where you can chat about B6304T2 tuning options and read about others projects who may be planning to do similar modifications on their B6304T2.

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