1.8T Engine Tuning Guides
Tuning Guides
Tuning guide for 1.8T BEX engines
Full power for your Audi A4: Up to 666 hp performance!
Up to 666 hp with your A4 in four tuning stages
Here you’ll find everything you need to exploit your Audi A4’s full potential. Our tuning guide for 1.8T engines with code BEX is divided into four clearly explained tuning stages, which tell you all the necessary parts and most important tips. This is the way to a safe and long-lasting boost in performance.
Installed in:
- Audi A4
Year of manufacture:
2002 – 2004
Engine Code:
- BEX
Stage 1
increased efficiency:
+ 25 hp
+ 100 Nm
Final output:
215 hp
340 Nm
You need this extra to make it last:
Chip tuning is a lot of fun and you don't necessarily need any additional components. However, you shouldn't use longlife oil, but rather GTX Racing oil 10W-60.
BAR-TEK® TIP!
As always at this point we recommend 102 octane as fuel. This makes the engine knock less and gives you more performance. Turbo and engine should be in good condition and not too old.
To reduce coking to a minimum and keep the engine clean, we recommend installing our oil catchtank kit with TÜV.
As always at this point we recommend 102 octane as fuel. This makes the engine knock less and gives you more performance. Turbo and engine should be in good condition and not too old.
To reduce coking to a minimum and keep the engine clean, we recommend installing our oil catchtank kit with TÜV.
Stage 2
increased efficiency:
+ 50 hp
+ 120 Nm
Final output:
240 hp
360 Nm
You need this extra to make it last:
Here you should urgently upgrade to a sports clutch, as the original clutch cannot transfer this power. For the conversion to K04-01 upgrade turbocharger you should use a racing catalytic converter and our upgrade air mass meter.
BAR-TEK® TIP!
If you have already installed a sports cat, an intake hose and an upgrade charge intercooler, you can simply continue to use them. The sports cat is very important for the 1.8T engines in the Passat and Audi A4.
If you have already installed a sports cat, an intake hose and an upgrade charge intercooler, you can simply continue to use them. The sports cat is very important for the 1.8T engines in the Passat and Audi A4.
Stage 3
increased efficiency:
+ 130 hp
+ 165 Nm
Final output:
320 hp
405 Nm
You need this extra to make it last:
320 PS is a good announcement! To be able to drive this power, you should replace your connecting rods with X-beam connecting rods. Now a sports clutch kit is absolutely necessary. For the exhaust you should use a 76 mm exhaust system.
BAR-TEK® TIP!
A good software tuning of all components is required for this conversion. For this you can send your control unit to us or have your car tuned by us. Another tip from us: You should convert the downpipe to 70 mm, as the Passat and Audi A4 have a very narrow body at the bottom of the axle beam. You should move the catalytic converter downwards. This will reduce the exhaust temperature and protect the turbocharger!
A good software tuning of all components is required for this conversion. For this you can send your control unit to us or have your car tuned by us. Another tip from us: You should convert the downpipe to 70 mm, as the Passat and Audi A4 have a very narrow body at the bottom of the axle beam. You should move the catalytic converter downwards. This will reduce the exhaust temperature and protect the turbocharger!
Stage 4
increased efficiency:
+ 476 hp
+ 568 Nm
Final output:
666 hp
808 Nm
You need this extra to make it last:
We'll tell you what you need for 666 hp here shortly.
BAR-TEK®
Engine repair guide Audi A4 (B6) 1.8T
Audi 2.5 TFSI (CEPA)
Audi 2.5 TFSI (DAZA)
Audi A4 (B6) 1.8T
Audi TT (8N) 1.8T
VW Golf 4 1.8T
VW Golf 5 TFSI
VW Golf 6 2.0 TFSI
VW Golf 7 2.0 TSI
VW Golf 8 2.0 TSI
VW Passat (3B) 1.8T
+% more
All data at a glance
One less source of error
Detailed instructions
Technical drawings
Cooling guide
increased efficiency:
Final output:
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.
Turbo guide
increased efficiency:
Final output:
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.
Turbo-Total
1.8T 20V Upgrade Turbocharger K04-01 Stage 1 BAR-TEK®
Stage 1 up to 260 HP
Stage 2 up to 320 HP
Standard turbocharger
+% more
up to 260 HP
Finely balanced
Reinforced bearing
Plug & Play
From
€1,930.21
Garrett
Garrett GTX2860R Gen II Super Core 849894-5001S
+% more
up to 475 HP
Standard Rotation
Ball bearing
Compressor wheel Ø 46mm
sale
Garrett
Garrett GTX3071R Gen II Super Core 851154-5002S
+% more
up to 675 HP
Standard Rotation
Ball bearing
Compressor wheel Ø 54mm
BAR-TEK®
1.8T 20V Upgrade Turbocharger Thor 501 BAR-TEK®
+% more
New design
Integrated Manifold
Bolt-On Kit
Easy to install
sale
BAR-TEK®
1.8T Top Mount Manifold V-Band BAR-TEK®
+% more
With V-band connection
Better response
Performance increase
Increased gas flow rate
Turbo-Total
1.8T top-mount manifold with ext. wastegate connection Turbo-Total®
+% more
Precise boost pressure control
Improved exhaust gas flow
Reduced turbocharger lag
Increased durability
BAR-TEK®
1.8T Top Mount Turbo Manifold Slotted T25
+% more
Shock Charging Turbo Manifold
Better response
Performance increase
Increased gas flow rate
BAR-TEK®
1.8T Audi S3 / TT / Cupra upgrade Turbo manifold High-Flow
+% more
34.5 mm diameter
optimum exhaust gas throughput
significant performance improvement
extremely temperature resistant
Race engines
increased efficiency:
Final output:
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.
BAR-TEK®
1.8T Block 2.2L over 300 PS capable
+% more
2.2 Liter
5 valves/cylinder
over 300HP stable
BAR-TEK®
1.8T RENNMOTOR 2.2L completely over 300HP capable
+% more
2.2 Liter
5 valves/cylinder
over 300HP stable
BAR-TEK®
1.8T Block 1.8L over 300 PS capable
+% more
1.8 Liter
5 valves/cylinder
over 300hp steady
BAR-TEK®
1.8T 20V racing engine 1.8L completely over 500 PS capable
+% more
over 500HP stable
1.8l Liter
5 valves/cylinder
BAR-TEK®
1.8T Block capable on 2.0L over 300 PS
+% more
2.0 Liter
5 valves/cylinder
over 300HP stable
BAR-TEK®
1.8T Race Engine 2.0L completely over 300 PS capable
+% more
2.0 Liter
5 valves/cylinder
over 300HP stable
These values are based on our own experience, but can vary depending on the vehicle. Since each engine is different and the maximum power depends on several factors, we can only give tendencies. If you want to know exactly what power your car is capable of, you can have it tested and tuned on our 1000 PS power dynamometer.
Questions about your 1.8T tuning?
We look forward to hearing from you and will be happy to answer your questions! Send us an e-mail!
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.
Expert in
Engine
Gearbox
YOUR TUNING EXPERT
BAR-TEK®
Motorsport –
Your specialist for professional Engine tuning
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!
Bartek
Bartek
Bartek
Bartek
Europe's No. 1 in engine tuning
Europe's largest store for Audi and VW engine tuning.
Same day shipping
Orders before 12 o'clock go out the same day.
All items are BAR-TEK proved
All items are tested and checked by us.
15 years of engine tuning experience
Of which 10 years in the top class of motorsports!
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