Modding upgrading and tuning the Vauxhall X24SFD engine!

Tuners tips on "X24SFD Modifications"

X24SFD Modifications Guide

How to modify and upgrade the Vauxhall X24SFD

"Comprehensive guide to tuning the Vauxhall X24SFD engine!"

Popular tuning sites like TorqueCars often are getting posts asking about how to improve the X24SFD from people wanting to know what are the things tuners are recommending when it comes to X24SFD power upgrades. So let us look into Vauxhall X24SFD upgrades and outline the best mods that work on this great engine and point out some problems along the way.

The Vauxhall X24SFD make a good tuning project and with the best tuning tuning mods like remapping, turbo improvements and camshafts you will improve your driving enjoyment.

Car Tuning Tips will look into X24SFD tuning and highlight the best modifications for your car.

When talking about the ultimate parts for your X24SFD engine, we are going to focus on the parts that give the best power gain for you money.

X24SFD induction kits

Improving air intake on the X24SFD

You need fuel and air for an engine to work. If there is little supply of fuel then it will run lean, if there is insufficient air it runs rich sapping power and potentially damaging the engine. We'll pick up on fuelling later in this article but for now we shall look at air supply.

So the aim to any engine performance tuning task to pull fuel and air into your X24SFD but this has a knock on effect with the air flow sensor.

It is common that there is a restriction in the air flow sensor MAF/MAP on the X24SFD when a lot more air is being drawn into the engine.

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

Headers take the during the engines suck phase from the air filter and allow it to be fed into the engine and mixed with fuel.

The size of bore and shape and flow characteristics of the Intake headers can make a noticeable effect on to fuel delivery on the X24SFD.

On popular production engines plenum chambers are in dire need of a performance upgrade, although a few OEM provide reasonably well designed plenum chambers.

Increasing the X24SFD valve size, carrying out port matching and head flowing will also lift torque, and importantly will allow you to get raising the torque increase on other parts.

X24SFD performance cam tips.

Some X24SFD engines respond better to more or less aggressive camshaft durations so set your engine up on a rolling road.

The ecu map and fuelling also will say much on the power gains you'll make.

Altering 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.

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

NB: Fast road camshafts usually push up the torque through the rev band, you may sacrifice a little low end torque but your high end rpm power will be lifted.

Motorsport and race camshafts, push up the high end rpm power band but as a result the car will not idle smoothly and low end power nearly always suffers.

A Motorsport cam is not great driving around busy urban areas.

You should ideally match your power band to your usage of the car so for a road car stick with a fast road X24SFD cam

Stage 1, 2 and 3 mods for the X24SFD

Before we break the best tuning upgrades down into stages of tune, let's list the most effective tuning upgrades for you.

  1. Suspension Upgrades - always improve your cars handling
  2. Brake Upgrades - Even before adding power improve those brakes
  3. Intake - make sure the intake is not restricted, use filters and intake upgrades to improve this
  4. Exhaust - as with 3 ensure there is not restriction in the exhaust, cats are the usual bottleneck
  5. Tunes - remapping, piggyback ECU's and aftermarket ECU's can all make decent gains
  6. Fuelling - when you've increased power you'll need to match this with more fuel
  7. Turbo upgrades - Improving the intake with a large turbo and better flowing intercooler will be the biggest power gain you'll see (but one of the most complex).

This video guide to tuning cars is a great starting point to work from in your project.

Stage 1 X24SFD parts:

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

Stage 2 X24SFD parts:

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

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

Stage 3 X24SFD parts:

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

The X24SFD engines respond well to upgrades and we're finding that there are plenty of modifications and tuning parts about.

ECU mapping helps unlock the full potential of all the parts you've done to your X24SFD.

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 usually depend much on the parts you've fitted and the condition of your engine.

Turbo modifications on the X24SFD

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 X24SFD.

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

When the engine is turbo charged parts are going to net you a larger power gain and most turbocharged engines will have strengthened components.

There are common areas of failure for every engine, with some being incredibly solid and some only just able to handle stock power

Research these limitations and upgrade to higher quality crank and pistons to survive the power.

We've seen drivers spending a a stack of money on turbocharger upgrades on the X24SFD only to experience the engine explode on it's first outing after it's been completed.

Larger upgraded turbos tend to suffer a bottom end lag, and low capacity turbos spool up much more quickly but do not have the top end bhp gains.

We are pleased that the choice of turbos is always evolving and we commonly find variable vane turbos, permitting the vane profile is altered according to speed to lower lag and increase top end power.

Twin scroll turbos divert the exhaust flow into two channels and push these at differently angled vanes in the turbocharger. They also increase the scavenging effect of the engine.

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

Tips about fuel supply on the X24SFD

When you boost the power you will need to look at to the fuel delivery.

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

As a rule of thumb add 15% to the flow rate when specifying an injector, this allows for injector deterioration and provides 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 X24SFD performance exhaust upgrades

We'd only recommend you look to upgrade your exhaust system with an upgraded one is if the current exhaust is actually creating a restriction in flow.

On most factory exhausts you'll find your 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 equal out the flow of air through the engine.

But if the exhaust pipe is too large, ie: over two and a half inches diameter, you will lose a great deal of your flow rate and end up losing power and torque.

The usual suspects causing problems in your exhaust flow rate are traced to the catalyst and 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 X24SFD

Like most engines an X24SFD, 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 X24SFD, failure to do this will exacerbate engine wear, on a tuned X24SFD 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 X24SFD why not pop over to the forums at TorqueCars where you can chat about X24SFD tuning options and read about others projects who may be planning to do similar modifications on their X24SFD.

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