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VW Golf 4 GTI 1.8T 20V
1.8T Engine Tuning Guides
Tuning Guides

Tuning guide for 1.8T AGU engines with 150 PS

Maximum power for Golf 4 and A3 with engine code AGU
by
Bartek Bartoszewicz
Tuning Professional

Ultimate power for AGU engines with 150 hp

We help with your tuning project – In this tuning guide you’ll find the four tuning stages that will get your AGU engine up to as much as 320 hp. The guide doesn’t just tell you all the parts you need – it provides important tips as well. This is the safe and sure-fire way to maximum power!

And for all those who find that not enough performance, we have put together another bundle for you. With level 5 you get 666 hp!

 

Installed in:

  • VW Golf 4 (Type 1J)
  • Audi A3 (Type 8L)

Year of construction:

1998 – 2002

Engine code:

  • AGU

The parts listed below should also fit in the largely identical engines AGN, AQA, ARZ, AUM and AUQ with an output between 125 and 180 hp.

The values ​​given are based on our experience with our Golf 4 GTI project.

You need this extra to make it last:

You don't need any additional components here. Simply install and have fun! Do not use Longlife oil, our GTX Racing Oil 10W-60 oil is better.

BAR-TEK® TIP!

We recommend filling up with 102 octane fuel. This will give your engine more power because it knocks less! The turbocharger should not be too old. Engine in good condition. The basis must be right.

We recommend filling up with 102 octane fuel. This will give your engine more power because it knocks less! The turbocharger should not be too old. Engine in good condition. The basis must be right.

Product Bundle 1
Group 6
BAR-TEK® 1.8T AGU Stage 1 - Bundle
Maximum performance on a budget
Perfect for getting started
Top price-performance ratio
The engine software must also be adapted for every tuning!
Benzindruckregler einstellbar 1.8T; VR6; R32 BAR-TEK®
+
Druckrohr Upgrade
+
+
+
+
+
1.8T Pipercross Luftfilter
Total
€964.66
incl. VAT

Immediately ready for shipment!

You need this extra to make it last:

To bring the extra power to the road, you need a sports clutch, because the original clutch cannot transfer the power. For the conversion to K04-01 upgrade turbocharger you have to install a racing cat and our upgrade air mass meter. A downpipe is a must.

BAR-TEK® TIP!

If you have already installed a sports cat, an intake hose and an upgrade intercooler, you can continue to use them. With an upgrade intercooler you also have the complete performance available in summer! If you want to get 220 hp right away, order the tuning kit level 3 directly! That saves money.

If you have already installed a sports cat, an intake hose and an upgrade intercooler, you can continue to use them. With an upgrade intercooler you also have the complete performance available in summer! If you want to get 220 hp right away, order the tuning kit level 3 directly! That saves money.

Product Bundle 2
Group 6
Group 6
BAR-TEK® 1.8T AGU Stage 2 - Bundle
With intercooler
Perfect ignition
Next Level Tuning
The engine software must also be adapted for every tuning!
Benzindruckregler einstellbar 1.8T; VR6; R32 BAR-TEK®
+
Druckrohr Upgrade
+
+
+
+
+
+
1.8T Pipercross Luftfilter
+
+
+
+
Total
€5,361.31
incl. VAT

Immediately ready for shipment!

You need this extra to make it last:

You also need a sports clutch here. For the conversion to K04-01 upgrade turbocharger you have to install a racing cat and our upgrade air mass meter. A downpipe is a must. Our 1.8T oil cooler ensures optimum operating temperatures.

BAR-TEK® TIP!

With the tuning kit stage 3 you have the extended extension stage of the kit stage 2. Here you have 380 ccm injectors and an upgrade manifold as well as an optimized software! If you have already installed a downpipe, an intake hose and an upgrade intercooler, you can continue to use them. With a large upgrade intercooler you also have the complete performance available in summer!

With the tuning kit stage 3 you have the extended extension stage of the kit stage 2. Here you have 380 ccm injectors and an upgrade manifold as well as an optimized software! If you have already installed a downpipe, an intake hose and an upgrade intercooler, you can continue to use them. With a large upgrade intercooler you also have the complete performance available in summer!

Product Bundle 3
Group 6
Group 6
Group 6
BAR-TEK® 1.8T AGU Stage 3 - Bundle
With forged pistons & steel connecting rods
Ambitious tuning
More powerful turbo
The engine software must also be adapted for every tuning!
Benzindruckregler einstellbar 1.8T; VR6; R32 BAR-TEK®
+
Druckrohr Upgrade
+
+
+
+
+
+
1.8T Pipercross Luftfilter
+
+
+
+
Total
€9,189.12
incl. VAT

Immediately ready for shipment!

You need this extra to make it last:

To drive the full 320 hp power, you have to replace your connecting rods with X-beam connecting rods. A sports clutch kit is required to get the horsepower on the road. For the exhaust you should use a 76 mm exhaust system. The pump must be an upgrade, otherwise there is a risk of engine damage due to slimming.

BAR-TEK® TIP!

A proper chip tuning is required for this conversion. You can send us your control unit or have your vehicle tuned directly in our workshop. Another tip from us: Your brake system is no longer up to the high performance. You can convert it to a Brembo 4-piston brake or to the Audi S3 8L.

A proper chip tuning is required for this conversion. You can send us your control unit or have your vehicle tuned directly in our workshop. Another tip from us: Your brake system is no longer up to the high performance. You can convert it to a Brembo 4-piston brake or to the Audi S3 8L.

Product Bundle 4
Group 6
Group 6
Group 6
Group 6
BAR-TEK® 1.8T AGU Stage 4 - Bundle
With Tuning-Kit Stage 4
Maximum performance
Professional tuning
The engine software must also be adapted for every tuning!
Benzindruckregler einstellbar 1.8T; VR6; R32 BAR-TEK®
+
+
+
+
+
+
+
Downpipe Kit universal zum selber bauen BAR-TEK®
+
+
Pop-off Ventil Splitter BAR-TEK®
+
1.8T Ansaug-Kit für Garrett Turbolader BAR-TEK®
+
Total
€10,243.55
incl. VAT

Immediately ready for shipment!

You need this extra to make it last:

We'll tell you here shortly what you need for 666 hp.

BAR-TEK® TIP!

Here is the absolute power amplifier for your 1.8T 20V! Bartek has successfully driven this kit in his Golf 4 - with top times!

Here is the absolute power amplifier for your 1.8T 20V! Bartek has successfully driven this kit in his Golf 4 - with top times!

Product Bundle 5
Group 6
Group 6
Group 6
Group 6
Group 6
BAR-TEK® 1.8T AGU Stage 5 - Bundle
Tuning-Kit Stage 5
Even more power
High-end tuning
The engine software must also be adapted for every tuning!
Benzindruckregler einstellbar 1.8T; VR6; R32 BAR-TEK®
+
+
+
+
+
+
Anschlusskit für BOSCH 044 Kraftstoffpumpe Saugseite
+
+
Halter für Benzinpumpe oder Benzinfilter SYTEC
+
Downpipe Kit universal zum selber bauen BAR-TEK®
+
+
Total
€10,873.20
incl. VAT

Immediately ready for shipment!

This is how you improve the cooling:

If you want to get the full performance out of your engine, you must not forget the cooling. Even a little extra power puts a lot of strain on your engine! The thermal load increases and affects all areas of your vehicle, even the transmission suffers from the new power. At best, the hard-earned power is reduced again; at worst, your engine suffers major damage. So that you can tune your engine safely and reliably, we provide you with everything you need for perfect cooling. Although it is ideal to install all parts together in a cooling bundle, you don't necessarily have to order everything at once. Each product helps you to improve cooling.

Cooling bundle
BAR-TEK® 1.8T AGU Cooling - Bundle
Optimal cooling
Maximum performance
Top value for money
The engine software must also be adapted for every tuning!
+
+
RS Thermostat und Lüfterschalter
+
Total
€689.80
incl. VAT

Immediately ready for shipment!

The perfect turbocharger for your tuning project

The turbocharger is one of the most important tuning measures of all, as there is huge performance potential in the compression ratio. This is why you will find all the turbos from the guides and suitable alternatives in this special turbo guide, for example if you prefer a specific manufacturer. We have also compiled a lot of information for you on the subject of turbochargers, which you should take a look at. In addition to the detailed turbo tips, there is a page on running in engines correctly, turbo lag and, of course, our 14 turbo rules.

Racing engines from BAR-TEK®

If you don't feel like tuning your engine all by yourself, you can also get a ready-tuned engine from us. Our racing engines are designed for maximum performance and maximum driving pleasure and leave nothing to be desired. The components included are perfectly matched, finely balanced and suitable for the highest speeds. Because we use components from motorsport, such as forged pistons and steel connecting rods, our racing engines are extremely stable. This means you get a completely finished engine that not only delivers full power, but is also safe and has a long service life.

The performances indicated here are based on our experience and can only indicate a tendency. Each engine is different and many factors play a serious role in the maximum power to be achieved. These include, for example, fuel, chip tuning and mileage. Therefore all data are without guarantee. Put your engine through its paces on our 1000 hp dynamometer.

We are happy to help you!

If you still have questions or need tips, we will be happy to help you. Simply contact us by contact form or write us a message!

Bartek Bartoszewicz
Tuning Professional
His first car was a Polo Mk1 with a 40 Weber twin carburetor and 129 PS (95 kW). His second was an Audi 50. Today Bartek tunes Lamborghinis to 1000 PS (735 kW). Even as a young boy, Bartek disassembled vehicles and put everything back together better. He wrote his high school diploma with oil on his fingers. The trained automotive mechanic with a focus on engines and gearboxes was determined to go into motorsports. In his 10 years in Formal 1, he supervised 73 races, including as engine mechanic for Ralf Schumacher at Toyota. Since 2010, he has dedicated himself fully to his company BAR-TEK® and helps his customers to bring VW and Audi engines to peak performance.
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BAR-TEK®

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We love engines, performance and speed. Here you will find everything you need to increase the performance of your engine. Especially the professional engine tuning for VW and Audi is one of our specialties. We are also happy to advise you individually and show you on our dynamometer, what you can get out of your car. In addition, we take over the tuning completely for you. Just give us a call!

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