The best Audi TT modifications

"Thanks for reading my TT tuning guide."

The TT represents a bit of a departure from the norm for Audi and they created  a great and fun sports car.

Styling on the Mk1 was quite revolutionary for Audi and the car was fantastic to drive, a good quality fun cheap to run sports car with many practicalities you won't find on similar cars from other manufacturers.

The Mk2 TT was even better than the original , and Audi have made great strides to improve every aspect of the car with each update and revision, and the legendary TTRS is one of the most desired cars among TT owners.

Audi can now put their excellent range of engines and Quattro drive train to good use in a chassis that has been designed with fun and handling in mind.

The TT is a very comfortable car to drive and flatters even the most inexperienced driver. The Quattro adds grip and traction where most cars would be starting to slide around.

The standard suspension is actually quite well setup, if a little harsh, but works really well. The Mag suspension is a positive dream and would be what we would specify if we could.

Avoid high mileage neglected cars, they will usually have many waiting bills. Regular servicing and oil changes are a must, brake discs and pads need regular checking and turbos can be quite expensive to replace if they go, although it's a good excuse to drop in a turbo upgrade and release a little more power.

See our video which covers all the principles of tuning your Audi.

Audi TT modifications.

Increasing the power output on the engine and a few choice suspension tweaks goes a long way to address most owners desire for improvement, and with some good exhaust mods you can make the car sound and feel as good as it looks when on the road.

So let's look at tuning this stunning Audi and see what the best mods and upgrades are for it.

Handling/Suspension upgrades

Many TT owners uprate the handling of their cars with coilover suspension mods as a priority, this will certainly increase your enjoyment of the car.

We found that most TT factory suspension setups need tweaking, a few degrees of toe out for cornering or toe in for stability, -0.9 to 1.5, and some negative camber will usually enhance your cornering and handling.

Drop the car by as much as 29mm - 37 mm and fit modified stiffer dampers, bigger drops will need other modifications in most instances.

The Magnetic suspension option is probably one of the best suspension setups in the world and we would find it hard to improve on this. However if your TT has conventional springs and dampers you have a wide choice of aftermarket options. Don't lower the car by too much and we strongly advise you to get fully adjustable shocks allowing you to tweak things to suit your driving style.

Engines and power mods

Increasing the power is generally the first port of call. The 1.8T engines comes in a number of power levels and is actually good for around 350bhp on stock internals.

There are also some really good NASP engine options but as the 1.8T is most popular we will focus on this. Our forum members are happy to help out if you have another engine in your TT or if you want to discuss engine swaps.

The later TFSi engines really push the boundaries and give good performance and fuel consumption. The 2.0 Tfsi engine offers a great base to tune up and the later 2.5 version adds more power and greater torque throughout the rev range.

The EA888 was added to the lineup and again offered more power and better economy/reliability.

The following upgrades are usually carried out by our members, decide how far you wish to go in your tuning project before you get going.

Getting the best motorsport mods for your planned usage of the car is vital. Stage 3 motor sport mods just don't work well on the road hard to control in slow traffic.

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Best mods for your car

  1. Mapping - remapping provides the most advantage in terms of cost savings,  aftermarket ECUs, and piggyback ECUs are all alternatives.
  2. Fast road cams are one of the most significant mechanical changes, but they must be installed by someone who knows what they're doing and they are not always easy to source but you might find a local firm to regrind a stock camshaft.
  3. Intake and Exhaust - Note that on their own these mods will NOT ADD POWER in most cases, but they can help enhance power after other mods by removing the restriction.
  4. Upgrades to turbochargers and superchargers - forced induction is the most efficient approach to increase air supply, allowing you to burn more fuel and make more power. It is one of the most costly upgrades but provides the best gains.
  5. Head work - The goals of porting and flowing the head are to get air flowing into the engine while removing flow restrictions and turbulence.

Typical stage 1 mods often include: Lighter flywheel, Sports exhaust, Suspension upgrade (drop 30-40mm), Panel air filter, Remap, Alloy wheels.

Typical stage 2 mods often include: high flow fuel injector, Power/Sport clutch, Ported and polished head, fuel pump upgrades, Fast road cam.

Typical stage 3 mods often include: Adding or upgrading forced induction (turbo/supercharger), Sports gearbox, Competition cam, Engine balancing, Internal engine upgrades (pistons/head/valves).

Turn your TT into a supercar beater with some very simple modifications.

To get anywhere near this power figure you will need to uprate the diverter valve, get a larger capacity turbo, fit a properly ported and polished head with a 3 angle valve job and then finish this off with a remap.

The KO4 turbo, although not a bolt on upgrade is the easiest stock upgrade option requiring a few adjustments to the manifold and oil feed. For larger peak power figures you will need to get a hybrid turbo or a replacement turbo and this would need to have it's turbines matched to your power delivery requirements. A KO3s is a good bolt on compromise and with this and a remap you should see power figures approaching 250bhp.

Another internal engine mod for the TT is to fit a fast road cam. As the 1.8T exhaust only has 2 valves you will find this to be a bit of a bottleneck and strongly recommend you get this ported allowing a much greater exhaust rate.

Don't forget to uprate the fuelling when you are increasing the power - it makes the car more thirsty.

An aftermarket fuel pressure regulator on pre TFSi models will almost certainly give a snappier throttle response than the standard Audi one especially if this is worn but it is probably not worth doing this mod alone or if your existing fuel regulator is in good condition!

Uprating the injectors is another beneficial modification and will deliver sufficient fuel. When increasing your fuelling with bigger injectors you will also need to get a bigger fuel pump to supply it.

The DMF flywheel is a bit of a pain and you can really transform the car by fitting a lighter flywheel. This will allow the car to rev more quickly and the engine will seem a lot more responsive. If you are changing your clutch then it would be worth considering a flywheel upgrade at the same time.

Brakes should also be upgraded and you can increase the discs and pistons to the larger ones used by Porsche or the Golf VR6, providing your offset and stud pattern matches and you have sufficient clearance in your alloys. There are also a number of quality big brake conversion kits for the TT. When it comes to PAD's we recommend Mintex and Pagid although there are many other good pads out there.

Audi TT Intake and Exhaust Tuning.

Breathing mods are usually next up. Induction kits sound great but from experience on the 1.8T engine you seem to end up with a flat spot around 3000 rpm. A good panel air filter and smoothed out air box are the best intake mods you can do.

The airbox gets its feed from the inner wing and you could fit a larger pipe like that fitted to the VR6 Golf which has a better flow rate.

Contrary to popular belief there is often a small power gain obtained by fitting an induction kit, they only work well and are recommended after you boost the engines power to the point where the standard air intake box cannot cope!

Sports exhausts balance the flow of air throughout the engine. But if your exhaust is too large, ie it is over 2.5 inches bore, you will lose a lot of the flow rate and lose power on most engines in the TT range. A sports catalyst will help to free up some top end power and the engine will be a lot more flexible.

A good fast road power clutch (double or triple plate) will help to keep that power going where it should. Never skimp or expect a standard clutch to cope when you push large power figures through the transmission.

The single best mod you can do on a turbocharged TT has to be a remap! It can easily give you another 30% power and makes the car a lot more fun for relatively little outlay. The only real downside to a remap is that you should service the car more frequently

A remapped turbo will give phenomenal power gains and take full advantage of the strength of the block.

Audi TT Wheel modifications.

Alloy wheels will help the brakes cool down and are usually lighter than the steel ones.

The downside to large alloy wheels on your TT is that you alter your effective final drive ratio and this will generally have a detrimental effect on acceleration and performance.

Larger wheels are prone to tram lining and you really need to keep the unsprung mass as low as possible.

Aim to keep the overall rolling diameter of the wheel the same as supplied from the factory. In all cases we do not recommend going above 18 inches.

Replacing your 18's with 17's will improve your handling and driving on the daily commute, most people notice how sharp the turn is and appreciate the softer ride. On the track a low profile tyre on an 18 will probably improve grip a little, but braking is not as sharp due to the higher unsprung mass.

You really need to join our forum and discuss the options for the TT with our other members to get an unbiased overview of what mods will work best on your car. Please join us in our friendly forum . It would also be worth reading our unbiased Audi tuning articles to get a full grasp of the benefits and drawbacks of each modification.

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Your Constructive comments on this article

3 Responses to “TT Tuning”

  1. thunderman says:

    my audi tt is a 2000 1800cc
    (225). it has a vw super racing chip fitted & ive fitted a ram air filter, is there any other simple mods i can do,,?

  2. James Maupin says:

    Is there cam upgrade for 2005 Audi TT Quattro 225 HP 1.8 engine ?

  3. Mr Grant says:

    I have remapped. mk1 TT (VAS Dorset)..looking to fit intercooler..(Airtek)..can you advise..Billy

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