++ 1.8T Tuning Guide:

+ Stage 0: Free / Budget Modding

+ Stage 1: Bolt-Ons

+ Stage 2: Other Parts

+ Stage 3: Medium Turbos

+ Stage 4: Big Turbos

+ Weight Reduction

+ Handling

 

+ Welcome to the MK4 1.8T Tuning Section

+ In this section, we will learn about the basics of a 1.8T 20V 4 Cyl Engine. After reading the basics, you can learn about popular modifications done to this motor. These modifications are divided into 6 sections: 4 for extracting power, 1 for handling, 1 for weight reduction. Enjoy!

• 1.8T Engine Cutaway


• Engine Specs:

Year / Mode / Engine Code:

Compression Ratio / HP / TQ / Turbo / Boost

2000 Golf/Jetta: AWD 2001 Golf/Jetta: AWW 2002-2006 Golf/Jetta: AWP 1997-1999 Passat: AEB 1999-2001 Passat: ATW 2001 Passat: AWM 2002-2004 Passat: AMB 1999-2000 Beetle: APH 2001+ Beetle: AWV 2002 Beetle Turbo S: AWP

9.5:1   |   150hp @ 5700RPM   |   155ft. lbs.@ 1750RPM   |   K03     |   .6 Bar 9.3:1   |   150hp @ 5700RPM   |   162ft. lbs.@ 1950RPM   |   K03s   |   .6 Bar 9.5:1   |   180hp @ 5500RPM   |   174ft. lbs.@ 1950RPM   |   K03s   |   .8 Bar 9.5:1   |   150hp                        |    N/A                                |   K03    |   .6 Bar 9.5:1   |   150hp                        |    N/A                                |   K03    |   .6 Bar 9.3:1   |   150hp                        |    N/A                                |   K03    |   .6 Bar N/A      |   170hp                        |    N/A                                |   N/A    |    N/A 9.5:1   |   150hp                        |    N/A                                |   K03     |   .6 Bar 9.5:1   |   150hp                        |    N/A                                |   K03     |   .6 Bar 9.5:1   |   180hp @ 5500RPM    |   174ft. lbs.@ 1950RPM   |   K03s   |   .8 Bar

• Basic Engine Information:

Category:

Spec

Type: Bore: Stroke: Displacement: Cylinder block: Crankshaft: Cylinder head: Valve Train: Firing Order: Cooling System: Fuel/Ignition System: Emission System:

Four cylinder inline, turbo charged, charge air intercooling 3.18 in. (81 mm) 3.40 in. (86.4 mm) 1.8 liters - 107 cu. in. Cast Iron Forged Steel, 4 main bearings Aluminum alloy DOHC, belt driven, hydraulic lifters 1-3-4-2 (Cylinder 1 is by the timing belt) Water-cooled, thermostatically controlled radiator fan Electronic multi-point sequential fuel injection, hot film air mass sensor, solid state direct ignition with multiple coils, dual knock sensors w/cylinder selective knock control and fully adaptive controls. Dual 3-way catalytic converters w/individual oxygen sensors

• Modification Guide:

Stage:	Description
+ Stage 0: + Stage 1: + Stage 2: + Stage 3: + Stage 4: + Weight Reduction: + Handling:	Free / Budget Modding Bolt-Ons : ~$950+ Other Parts: ~$1000+ Medium Sized Turbos: ~$800+ Big Sized Turbos Shaving lbs off your MK4 Suspension, tires, sways