Knowledge Base

1.8T Wiki

Everything you need to know about the VAG 1.8T engine – from engine variants and tuning potential to maintenance tips and known weak points.

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Engine Variants – Complete Overview

All common 1.8T engine variants (engine codes) with technical specifications (work in progress):

Code Power Compression ECU Block VVT Lambda Port Size FPR MAF MAP Injectors Wrist Pins Turbo Intercooler
AGU 150 PS 9,5:1 M3.8.3 06A NO narrow big 3 bar 70 mm NO 283 ccm 20 mm K03 SMIC
ATC 150 PS 9,5:1 ME7.5 06A NO narrow small 3 bar 70 mm 2500 kpa 317 ccm 20 mm K03 SMIC
AQA 150 PS 9,5:1 ME7.5 06A NO narrow small 3 bar 70 mm 2500 kpa 317 ccm 20 mm K03 SMIC
AJQ 180 PS 9,5:1 ME7.5 06A NO narrow small 3 bar 70 mm 2500 kpa 317 ccm 20 mm K03 SMIC
ARZ 150 PS 9,5:1 ME7.5 06A NO narrow small 3 bar 70 mm 2500 kpa 317 ccm 20 mm K03 SMIC
APP 180 PS 9,5:1 ME7.5 06A NO narrow small 3 bar 70 mm 2500 kpa 317 ccm 20 mm K03 SMIC
AUM 150 PS 9,5:1 ME7.5 06A YES wide small 3 bar 70 mm 2500 kpa 317 ccm 19 mm K03S SMIC
AUQ 180 PS 9,5:1 ME7.5 06A YES wide small 3 bar 70 mm 2500 kpa 317 ccm 19 mm K03S SMIC
ARX 150 PS 9,5:1 ME7.5 06A YES wide small 3 bar 70 mm 2500 kpa 317 ccm 19 mm K03S SMIC
ARY 180 PS 9,5:1 ME7.5 06A YES wide small 3 bar 70 mm 2500 kpa 317 ccm 19 mm K03S SMIC
BVP 163 PS 9,5:1 ME7.5 06A YES wide small 3 bar 70 mm 2500 kpa 317 ccm 19 mm K03 SMIC
AWP 180 PS 9,5:1 ME7.5 06A YES wide small 3 bar 70 mm 2500 kap 317 ccm 19 mm K03S SMIC
BJX 150 PS 9,5:1 ME7.5 06A YES wide small 3 bar 70 mm 2500 kpa 317 ccm 19 mm K03S SMIC
BBU 180 PS 9,5:1 ME7.5 06A YES wide small 3 bar 70 mm 2500 kpa 317 ccm 19 mm K03S SMIC
AMK 209 PS 9:1 ME7.5 06A YES wide small 3 bar 80 mm 2500 kpa 393 ccm 20 mm K04 Dual SMIC
APY 209 PS 9:1 ME7.5 06A NO narrow small 3 bar 80 mm 2500 kpa 393 ccm 20 mm K04 Dual SMIC
APX 225 PS 9:1 ME7.5 06A NO narrow small 3 bar 80 mm 2500 kpa 393 ccm 20 mm K04 Dual SMIC
BAM 225 PS 9:1 ME7.5 06A YES wide small 3 bar 80 mm 2500 kpa 393 ccm 20 mm K04 Dual SMIC
BFV 240 PS 9:1 ME7.5 06A YES wide small 3 bar 80 mm 2500 kpa 393 ccm 20 mm K04 Dual SMIC
AEB 150 PS 9,5:1 M3.2 / M3.8.2 827/058 NO narrow big 4 bar 70 mm NO 245 ccm 20 mm K03 SMIC
AJL 180 PS 9,5:1 M3.8.2 827/058 NO narrow big 4 bar 70 mm NO 245 ccm 20 mm K03 SMIC
ANB 150 PS 9,5:1 ME7.5 827/058 NO narrow small 4 bar 70 mm 2500 kpa 258 ccm 20 mm K03 SMIC
APU 150 PS 9,5:1 ME7.5 827/058 NO narrow small 4 bar 70mm 2500 kpa 258 ccm 20 mm K03 SMIC
AWT 150 PS 9,5:1 ME7.5 06A YES wide small 4 bar 70 mm 2500 kpa 273 ccm 19 mm K03 SMIC
AVJ 150 PS 9,5:1 ME7.5 06A YES wide small 4 bar in fuelfilter 70 mm 2500 kpa 273 ccm 19 mm K03 SMIC
BFB 163 PS 9,5:1 ME7.5 06A YES wide small 4 bar in fuelfilter 70 mm 2500 kpa 273 ccm 19 mm K03 SMIC
AMB 170 PS 9,5:1 ME7.5 06A YES wide small 4 bar in fuelfilter 70 mm 2500 kpa 273 ccm 19 mm K03 SMIC
BEX 190 PS 9,5:1 ME7.5 06A YES wide small 4 bar in fuelfilter 70 mm 2500 kpa 317 ccm 19 mm K03S Dual SMIC

Durability & Key Facts

There are many rumours about the special durability of AGU and AEB engines. In practice, however, these cannot be substantiated.

In general, all engines with stock internals are reliable up to approximately 380 Nm. Engines without VVT can handle slightly more torque due to their later torque delivery.

A general statement can also be made: the later the maximum torque occurs, the more durable the engine and the more torque can be run.

This is likely the origin of the rumour mentioned at the beginning. You often read about AGU and AEB engines with GT28 conversions and 300+ HP. Since a GT28 generally has relatively poor throttle response and these engines have no VVT – meaning torque also comes in very late – an AGU/AEB stock engine can handle 450 Nm at 5000 rpm.

So let it be clearly stated: maximum power is not the decisive factor for potential durability. Maximum torque and the associated engine speed are the important figures here.

Forged Crankshafts

There are also many rumours about the use of forged crankshafts. We can only provide mixed information on this: we have found cast crankshafts in engines that were supposedly forged from the factory – and vice versa.

3 bar vs. 4 bar Fuel Pressure Regulator

Another topic we would like to address is the 3 vs. 4 bar fuel pressure regulator. You often read: “Injectors have their best spray pattern at 3 bar – anything below or above is bad.”

This is not generally correct. There are injectors designed for pressures other than 3 bar, as they were explicitly built for configurations with different pressures. Furthermore, longitudinally installed 1.8T engines always run 4 bar fuel pressure. This would mean every such 1.8T has a worse spray pattern from the factory – along with all the supposedly associated disadvantages.