Modding uprating the Nissan MRA8DE engine!

Tuners tips on "MRA8DE Modifications"

MRA8DE Modifications Guide

How to modify and upgrade the Nissan MRA8DE

"Comprehensive guide to tuning and performance parts on the Nissan MRA8DE engine!"

Popular tuning sites like TorqueCars often are seeing threads asking how to improve the MRA8DE from people wanting to know what are the greatest MRA8DE upgrades. So let us look into Nissan MRA8DE mods and outline the best modifications on this great engine and point out some potential pitfalls along the way.

Our aim here is to examine MRA8DE tuning and highlight the ultimate modifications. Nissan MRA8DE are popular engines and with the right motorsport enhancements like ECU maps, turbo kits and camshafts you will really enhance your driving fun.

When talking about the greatest parts for your MRA8DE engine, we are going to concentrate on the parts that give the best value for money.

MRA8DE induction kits

Improving air intake on the MRA8DE

You need air matched to fuel for an engine to work. If there is a lack of fuel then it will run lean, if there is insufficient air it runs rich resulting in lost power which risks damage to the MRA8DE. We'll pick up on fuelling later in this article but for now we shall look at air supply.

So the fundamental goal to any performance tuning project to force air and fuel into each cylinder but this has a knock on effect with the air flow sensor.

You'll commonly see there is a limitation in the air flow sensor MAP/MAF/AFM on the MRA8DE 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 limited performance at a much lower level.

Engine intake manifolds take the air during the suck phase from the air filter and allow it to be drawn into the engine cylinders.

Shape and flow characteristics of the air Intake manifold can make a noticeable effect on to fuel atomisation and engine efficiency on the MRA8DE.

Most air intake manifolds are improved through an upgrade, although a few manufacturers provide well optimised air intake manifolds.

Big valve conversions on the MRA8DE, getting MRA8DE port enlargement and head flowing will also boost performance, and as an added benefit will permit raising the performance increase on other upgrades.

MRA8DE performance cam tips.

Some MRA8DE engines respond better to more or less aggressive cam durations so set your engine up on a rolling road.

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

A longer valve duration 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 bhp gains are on offer for camshaft upgrades.

NB: Fast road cams commonly bump the bhp throughout the rev range, you may sacrifice a little bottom end torque but your top end will improve.

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

For a daily driver you must carefully try to optimize your power band to your usage of the car.

I would be surprised if you have found a MRA8DE Motorsport camshaft is a pleasure to live with when driving in heavy traffic.

Stage 1, 2 and 3 mods for the MRA8DE

Stage 1 MRA8DE parts:

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

Stage 2 MRA8DE parts:

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

Stage 3 MRA8DE parts:

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

Plan your options and then buy your parts and set yourself a power target to avoid costly mistakes.

Remapping helps fully realize the full potential of all the parts you've done to your MRA8DE.

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 usually 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 MRA8DE

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 MRA8DE.

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.

If an engine is fitted with a turbo upgrades are giving better power gains and we find turbocharged engines already contain uprated components.

However engines will have power limits

It is important to find these restrictions and fit forged components to utilize the power.

We see many tuners spending a a stack of money on turbo upgrades on the MRA8DE only to see the MRA8DE catastrophically fail just after it's completed.

Big turbo units will usually suffer a bottom end lag, and small turbo units spool up quickly but won't have the top end power band gains.

We are pleased that the range of turbos is always increasing and we commonly find variable vane turbos, allowing 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 flow 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 bhp gains, although harder to configure. We have this feature on twinchargers if you want to read more.

Tips about fuel supply on the MRA8DE

You will need to ensure that the engine is not starved of fuel so will need to look at the fuelling when you start extending past 20% of a bhp and torque hike. At this point we flag up the need to be generous with your injectors flow rate.

As a rule of thumb add 15% capacity when buying an injector, helps cope with injector deterioration and allows some 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 MRA8DE performance exhaust upgrades

You may need to uprate your exhaust system with an upgraded one is if the existing exhaust is actually causing a restriction.

On most factory exhausts you'll see the flow rate is still ok 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 can help equal out the flow of gases through the engine.

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

Usual exhaust restrictions can be located the catalyst installed, so adding a freer flowing performance alternative will help avoid this restriction.

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

Faults issues and things to look out for on the MRA8DE

Like most engines an MRA8DE, 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 MRA8DE, failure to do this will exacerbate engine wear, on a tuned MRA8DE 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 MRA8DE why not pop over to the forums at TorqueCars where you can chat about MRA8DE tuning options and read about others projects who may be planning to do similar modifications on their MRA8DE.

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