Nissan GA Tuning

"All you need to know about performance tuning the Nissan GA engine!"

The Nissan GA offer good returns when tuned and with a few sensible motorsport upgrades like remapping, turbo kits and camshafts you will greatly enhance your driving pleasure.

Let us review GA tuning and provide tips on the greatest upgrades.

History of the Engine

GA13

  • GA13S SOHC Carb 12 valve 79hp
  • GA13DS DOHC Carb 16valve 78hp
  • GA13DE DOHC fuel injection 84hp

GA14

  • GA14S SOHC Carb 12 valve 79 hp 
  • GA14DS DOHC Carb 16valve 74hp
  • GA14DE DOHC fuel injection  101 hp

GA15

  • GA15S SOHC Carb 12 valve 84hp
  • GA15DS DOHC Carb 16valve 93hp
  • GA15E SOHC fuel injection 96 hp
  • GA15DE DOHC  fuel injection 104 hp

GA16

  • GA16S SOHC Carb 12 valve 94 hp
  • GA16E SOHC fuel injection 110 hp
  • GA16i DOHC fuel injection 90 hp
  • GA16DE DOHC  fuel injection 16 valves 110 hp
  • GA16DE DOHC  fuel injection 16 valves 102 & 115hp USA
  • GA16DS  DOHC 16 valves  electronically controlled carburetor & catalyst 89 hp
  • GA16DNE DOHC 16 valves  electronically controlled carburetor & catalyst 105 hp Mexico & Asia

Tuning the Nissan GA and best GA performance parts.

Best GA tuning mods

Just because particular parts are are common on GA it doesn't mean you should fit it, we shall greatest parts that will give your GA the best power gain for you money.

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

Fast road cams tend to raise the bhp throughout the rev band, you could drop a little bottom end power but the top end will improve.

Motorsport cams, raise 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 should ideally to match your power band to your typical driving style.

I'd be surprised if you find a GA Motorsport and race camshaft is a pleasure to live with when driving in heavy traffic.

Different GA engines respond better to less aggressive camshaft durations so set your engine up on a rolling road.

The map and injectors and fuel pump also have a large bearing on the power gains you'll get.

Extending exhaust or intake 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.

Typical stage 1 mods often include: Intake headers, Drilled & smoothed airbox, Sports exhaust manifold, Remaps/piggy back ECU, Fast road camshaft, Panel air filters.

Typical stage 2 mods often include: high flow fuel injectors, fuel pump upgrades, Ported and polished head, Sports catalyst & performance exhaust, induction kit, Fast road cam.

Typical stage 3 mods often include: Crank and Piston upgrades to alter compression, Engine balancing & blueprinting, Competition cam, Adding or Upgrading forced induction (turbo/supercharger), Twin charging conversions, Internal engine upgrades (head flowing porting/bigger valves).

The GA power trains are fantastic to work on and we note that there is a growing number of upgrades and performance parts around.

ECU mapping should help to fully realize the full potential of all the mods you've fitted to your GA.

It will usually give around 30% more power on turbocharged vehicles and you can expect to see around 15% on NASP engines, but the end result usually vary depending on the mods you've done and the condition of your engine.

Feeding fuel and air into the GA engine is the main goal to any engine tuning project.

The intake plenum transmit the air from the air filter and allow it to be drawn into the engine and mixed with fuel.

The bore size, shape and flow rate of the Intake manifold can make a noticeable difference to to fuel delivery on the GA.

On popular production engines headers are begging for an upgrade, although a few OEM provide fairly well optimized headers.

Fitting big valve kits, doing a bit of port work and head flowing will also lift performance, the fantastic side effect is it will permit a greater performance increase on other modifications.

Turbo upgrades

NASP engines need quite a lot of work when you add a turbo, so we have a separate guide to help you take into account the pros and cons of going this route on your GA

It is not unusual that there's a restriction in the air flow sensor (AFM/MAF/MAP) on these engines 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.

Adding a supercharger or additional turbo will make large torque gains, although more complex to get working. We have this guide to twinchargers if you want to read more.

Fuelling

Don't dismiss the need improve the fuel delivery when you are increasing the bhp - it makes the car more thirsty.

Converting from a carb to fuel injection brings many benefits but is not particularly easy to do.

One method is to take the fuel injection system from another GA block and retrofit it to yours.

Don't forget to be generous with your flow rate on the injectors.

The accepted safe increase is to add 20% when buying an injector, which takes into account injector deterioration and affords some spare capacity should the engine need more fuel.

We think this one is common sense, but you'll need to match your fuel injector to the type of fuel your car uses as well.

All the following flywheel power targets will assume an injector duty cycle of 80% and a base of 58psi of fuel pressure at idle.

4 Cylinder NASP engines

  • 58 PSI 285cc/min 200hp
  • 58 PSI 426cc/min 300hp

Exhaust

Only look to uprate your exhaust if your exhaust is actually creating a flow problem.

On most factory exhausts you should find that your flow rate is fine even on modest power gains, but when you start pushing up the power levels you will need to get a better flowing exhaust.

Don't go with the largest exhaust you can find you'll slow the exhaust rate - the best for power gains are usually between 1.5 to 2.5 inches. It is the shape and material more than the bore size.

Usual exhaust restrictions are traced to the filters installed, so adding a freer flowing race alternative will help avoid this restriction.

Weak spots Issues & problem areas on the GA

The GA engines are generally reliable and solid as long as they are regularly serviced and maintained.

Regular oil changes are vital on the GA, especially when tuned and will help extend the life and reliability of the engine.

For more information on Tuning your GA engine please join us in our friendly forum where you can discuss tuning options in more detail with our tuning articles to get a full grasp of the benefits and drawbacks of each modification.

Please help us improve these tips by sending us your feedback in the comments box below.

We love to hear what our visitors have got up to and which tuning parts work best for them on each model of car. Comments are used to improve the accuracy of these GA articles which are continually updated.

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