Modding upgrading and tuning the Nissan QD32 engine!

Car tuning tips:QD32 Modifications"

QD32 Modifications Guide

How to modify and upgrade the Nissan QD32

"Comprehensive guide to tuning the Nissan QD32 engine!"

TorqueCars are frequently getting posts requesting information on how to improve the QD32 from people wanting to know what are the best tips for QD32 mods that work. So let us look into Nissan QD32 tuning mods and outline the best modifications on this great engine and point out some problems along the way.

The Nissan QD32 are awesome to work on and with carefully picked tuning parts like remapping, turbo upgrades and camshafts you will really improve your driving fun.

We shall examine the options for your QD32 tuning and report on the greatest modifications.

When talking about the greatest parts for your QD32 engine, we are going to concentrate on the tuning mods that give the best value for money.

QD32 induction kits

Improving air intake on the QD32

You need air and fuel for an engine to work. If there is insufficient fuel then it will run lean, if there is not enough air it runs rich resulting in lost power . We'll pick up on fuelling later in this article but for now we shall look at air supply.

So the whole point to any performance tuning project to feed more air into the QD32 engine but this has a knock on effect with the air flow sensor.

It is not unusual that there is a limit in the air flow sensor (AFM/MAF/MAP) on the QD32 when considerably more air is being pulled into the engine.

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

Intake flow the on the suck phase from the filter and allow it to be pulled into the engine cylinders with fuel for the squish phase.

Design and flow characteristics of the Headers can make a big effect on to fuel engine efficiency on the QD32.

Many mass produced engine intake headers are crying out for a performance upgrade, although some manufacturers provide reasonably well designed intake headers.

Adding a QD32 larger valve kit, doing a bit of QD32 port enlargement and head flowing will also improve bhp, this will give you a better bhp increase on other tuning mods.

QD32 performance cam tips.

Some QD32 engines respond better to mild camshaft durations so view each engine as unique.

The ECU mapping and injectors and fuel pump also will say much on the bhp gains you'll hit.

Extending exhaust or intake durations can alter the bhp 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 QD32 can be made from camshaft upgrades. Changing the camshaft profile alters the intake and exhaust durations on the engine and can dramatically change the engines power and power output.

NB: Fast road cams tend to increase the bhp through the rev band, you could drop a little bottom end bhp but your top end will improve.

Motorsport cams, increase 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 should ideally to optimize your power band to your cars usage.

I'd be shocked if you have found a QD32 Motorsport and race cam is a pleasure to live with when on the daily commute.

Stage 1, 2 and 3 mods for the QD32

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 QD32 parts:

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

Stage 2 QD32 parts:

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

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

Stage 3 QD32 parts:

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

Carefully think through your options and then acquire your tuning mods and set yourself a power target to avoid costly mistakes.

ECU mapping helps to establish the full potential of all the mods you've done to your QD32.

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 figures achieved usually depend much on the mods you've done and the condition of your engine.

Turbo modifications on the QD32

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 QD32.

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 fitted with a turbocharger mods are going to net you a larger power gain and most turbocharged engines will have harder and stronger components.

There are reliable limits for every engine, with some being over specified and some only just able to handle stock power

See where you'll find these limits and upgrade to higher quality components to handle the power.

There are many drivers spending a fortune on turbo upgrades on the QD32 only to suffer the indignity of watching the motor explode soon after it's used in anger.

Large capacity turbo units will usually experience a bottom end lag, and little turbo units spool up really quickly but don't have the top end bhp gains.

Thankfully the selection of turbo units is always increasing and we commonly find variable vane turbo units, allowing the vane angle is altered according to speed to lower lag and increase top end bhp.

Twin scroll turbo units divert the exhaust flow into a couple of channels and feed these at differently profiled vanes in the turbo. 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 performance gains, although more difficult to setup. We have this guide to twinchargers if you want to read more.

Tips about fuel supply on the QD32

Don't dismiss the need look at 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 15% when fitting an injector, this allows for injector deterioration and affords a little 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 QD32 performance exhaust upgrades

You only need to to upgrade your exhaust system with an upgraded one is if your current exhaust is actually creating a flow problem.

On most factory exhausts you'll find your flow rate is still good 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 increase the flow of gases through the engine.

But if the exhaust is too large, ie: it's 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 traced to the emissions filters installed, so adding a faster flowing race 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 QD32

Like most engines an QD32, 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 QD32, failure to do this will exacerbate engine wear, on a tuned QD32 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 QD32 why not pop over to the forums at TorqueCars where you can chat about QD32 tuning options and read about others projects who may be planning to do similar modifications on their QD32.

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