Modding and performance tuning parts for the Vauxhall X20XEV engine!

Modifying and improving: "X20XEV Modifications"

X20XEV Modifications Guide

How to modify and upgrade the Vauxhall X20XEV

"Comprehensive guide to tuning and performance parts on the Vauxhall X20XEV engine!"

Our friends at TorqueCars are always getting emails asking about how to improve the X20XEV from people wanting to know what are the best X20XEV power upgrades. So let us look into Vauxhall X20XEV mods and outline the best upgrades on this great engine and point out some common pitfalls along the way.

The Vauxhall X20XEV great bases for a tuning project and with the ultimate sports mods like ECU maps, turbo improvements and camshafts you will enhance your driving enjoyment.

Car Tuning Tips will outline options for your X20XEV tuning and provide tips on the premier modifications for your car.

When talking about the ultimate parts for your X20XEV engine, we are going to concentrate on the ones that give the biggest return for your cash.

X20XEV induction kits

Improving air intake on the X20XEV

You need fuel and air for an engine to work. If there is a lack of fuel then it will run lean, if there is a lack of air it runs rich losing power which risks damage to the X20XEV. We'll pick up on fuelling later in this article but for now we shall look at air supply.

So the goal to any engine modification project to pull air into each cylinder but this has a knock on effect with the air flow sensor.

You'll commonly see there is a restriction in the air flow sensor AFM/MAF on the X20XEV when considerably more air is being drawn into the engine.

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

Engine intake manifolds carry the air from the intake filter and allow it to be pulled into the engine cylinders with fuel for the squish phase.

Structure and rate of flow of the Headers can make a substantial effect on to fuel atomisation and engine efficiency on the X20XEV.

Many mass produced engine headers are ripe for aftermarket tuning parts, although a few car makers provide fairly well optimized headers.

Adding a X20XEV larger valve kit, getting port work and head flowing will also raise bhp and torque, and more importantly will give you raising the bhp and torque increase on other parts.

X20XEV performance cam tips.

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

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

Extending exhaust or intake 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.

Significant air intake, and exhaust improvements on the X20XEV can be made from camshaft upgrades. Changing the camshaft profile alters the intake and exhaust durations on the engine and can dramatically change the torque and power output.

NB: Fast road camshafts usually increase the power throughout the rev range, you could drop a little bottom end torque but the top end will be higher.

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

A Motorsport and race cam is not great on the daily commute.

You should ideally match your engines power to your cars usage so for a typical daily driver stick with a shorter duration X20XEV cam

Stage 1, 2 and 3 mods for the X20XEV

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 X20XEV parts:

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

Stage 2 X20XEV parts:

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

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

Stage 3 X20XEV parts:

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

The X20XEV engine blocks respond well to mods and thankfully there are plenty of mods and tuning parts about.

Mapping helps unlock the full potential of all the mods you've done to your X20XEV.

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 power output will rely on the mods you've applied and the condition of your engine.

Turbo modifications on the X20XEV

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 X20XEV.

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

When a car is turbo charged mods are going to make more power and most turbocharged engines use harder and stronger components.

However you will find an engines will have power limits

Discover these limitations and install stronger pistons, crank and engine components to utilize the power.

We've seen tuners spending a lots of money on turbo charger upgrades on the X20XEV only to watch the engine explode soon after it's been enthusiastically driven.

Large upgraded turbo units often experience no power at low rpm, and small turbo units spool up much more quickly but don't have the peak rpm engines power gains.

Over the last 20 years the market of turbos is always evolving and we commonly find variable vane turbos, where the vane angle is altered according to speed to lower lag and increase top end performance.

Twin scroll turbos divert the exhaust flow into a couple of channels and feed these at differently angled 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 power gains, although more complex to get working. We have this in depth look at twinchargers if you want to read more.

Tips about fuel supply on the X20XEV

When you raise the power you will need to ramp up to the fuel system.

More power needs more fuel. We would recommend you to over specify your flow rate on the injectors.

The accepted safe increase is to add 15% to the flow rate when fitting an injector, which takes into account injector deterioration and affords a bit of spare capacity should the engine need 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 X20XEV performance exhaust upgrades

The only time you should look to replace your exhaust system with an upgraded one is if the current exhaust is actually creating a flow problem.

On most factory exhausts you'll find the exhaust 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 gases through the engine.

But if the exhaust is too big, ie: it's over two and a half inches diameter, you will lose a lot of your flow rate and end up losing power and torque.

The usual suspects causing problems in your exhaust flow rate can be traced to the catalyst installed, so adding a better flowing sports alternative will help avoid this restriction.

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

Faults issues and things to look out for on the X20XEV

Like most engines an X20XEV, 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 X20XEV, failure to do this will exacerbate engine wear, on a tuned X20XEV 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 X20XEV why not pop over to the forums at TorqueCars where you can chat about X20XEV tuning options and read about others projects who may be planning to do similar modifications on their X20XEV.

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