Alfa Romeo Giulietta Tuning

"Adding some Guile and cunning to the Guilietta"

We look at Giulietta tuning and report on the best modifications. Alfa Romeo Giulietta are often unfairly overlooked cars and with a few sensible performance modifications you can greatly increase your driving enjoyment of them. They go very well in standard form and are practical everyday cars.

The Giulietta is a good basis for a car tuning project.  It was offered with a well specified range of petrol and diesel engines. We particularly like the 1.75 Petrol and the 2.0 Diesel but all engines are willing, pull well and respond well to tuning modifications.

  • 1.4 L i4 t/c petrol/LPG
  • 1.4 L i4 t/c petrol (MultiAir)
  • 1.75 L i4 t/c petrol
  • 1.6 L i4 t/c diesel (JTDM)
  • 2.0 L i4 t/c diesel (JTDM)

Uprating your Giulietta's cornering and general handling is often a big priority. Don't go too mad when it comes to lowering your car, a drop of around 35mm will make a noticeable difference.

Tuning tips and articles

Engine tuning Transmission tuning Care care Intake & exhaust mods Improve handling Forums

Bear in mind that a track day suspension setup will be hard to live with on our roads with potholes and rough surfaces to contend with.

The overall aim in Giulietta engine tuning should be to increase peak power and torque at the top end and have a nice flat torque curve that starts low down.

With some simple modifications you can really transform your Giulietta into a fun car, and credible track performer.

When it comes to car tuning you always get a percentage gain so start off with a powerful engine to start with to maximise your tuning investment - the 170bhp JDm-2 editions work very well indeed.

Alfa Romeo Giulietta Tuning modifications.

Bear in mind the mantra that you want to keep as much low end power as you can and aim for a wide power band rather than a narrow top end power spike.

The following modifications are usually performed by our members, decide how far you want to go before you begin.

Getting the right mods for your planned usage of the car is vital. Stage 3 (competition) mods just don't work well on the road.

Typical stage 1 mods often include: Exhaust, Panel air filter, Remap, lighter flywheel

Typical stage 2 mods often include: Fast road cam, ported and polished head, fuel injector & fuel pump upgrades,

Typical stage 3 mods: Engine balancing, forced induction (turbo/supercharger), Internal engine upgrades (pistons/head/valves), competition cam.

Fast road cams are generally one of the best power mods you can do to your engine. But you need to select the right profile, for advice on cam selection see our tuning articles for more information. You will need to ensure that the engine is not starved of fuel so will need to uprate the fuelling. Using uprated injectors and a bigger capacity fuel pump deals with the fuelling issue.

Alfa Romeo Giulietta intake and exhaust modifications.

Let's move on to the engine intake and exhaust and ensure proper flow through the engine. You need to derestrict the airflow into the engine as much as possible and the bottleneck on most engines is the air filter so fitting a cotton panel air filter will address this.

When it comes to exhaust the key thing is flow rate. Big exhausts do not always flow better so don't go sticking on the biggest pipe you can buy!See our article on performance exhausts for details of the issue around large bore exhausts and how to choose the right size for your engine.

Getting the head ported and polished will further help more air into each cylinder. This is definately a job for a professional with a flow bench. A good fast road power clutch will help to keep that power going where it should. Never just hope that a standard worn clutch will cope.

Despite the large cost involved adding forced induction to a NASP engine will give large power gains. Superchargers are generally easier to add than turbos.

Turbos give boost in exponential proportion to increasing engine speed and this can make mapping difficult. The nice steady boost to rpm characteristics of the supercharger make them easier to map. To cope with forced induction you will usually need to decrease the compression ratio of the engine.

Alfa Romeo Giulietta Wheel modifications.

The benefits of alloy wheels include a lower unsprung weight and more efficient brake cooling. Large wheels tend to be heavy and the last thing you want is to increase the unsprung mass in your car, instead choose performance tyres and light weight wheels of a similar size to the OEM settings on your car.For this reason we would advise sticking to a maximum wheel size of 16 inches, although we know some of our members have gone larger than this with no problems.

If you would like to know more, or just get some friendly advice on Tuning your car please join us in our car forums where you can discuss Giulietta options in more detail with our Giulietta owners. It would also be worth reading our unbiased Alfa Romeo tuning articles to get a full grasp of the benefits and drawbacks of each modification.

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