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Dyno/Data
Vehicle Details

Make: Audi
Model: A4
Year: 2003
Engine: 20v 1.8 Liter
Induction Model: Garrett GT28RS
Cooling Detail: ATP Front Mount Intercooler Kit
Stock Crank Horsepower/Torque: 170/166
Stock Wheel Horsepower/Torque: 138/145
After  Crank Horsepower/Torque: 213/188


ATP Implements the GT28RS (aka Disco Potato) Turbo on the 2003 Audi A4 with the 1.8L 20V engine.

Booost is kept stock at 10 psi levels
ATP Hi-Flow turbo exhaust manifold and bigger injectors for the additional airflow.
Dyno graphs are HP as the wheels as measured on our 4WD dyno.

Observed Gains:

1. Boost Comes on quickly, almost as quick as stock (especially with the new exhaust manifold).
2. Clearly shows the stock K03 (mfgd. by KKK) is inefficient, for stock boost levels.
3. Very Impressive power gain, even at these low boost levels.
4. Clearly shows big gains and do not need to sacrifice torque. Very good turbo response, especially on the lazy 1.8L.

Installation Details

OEM Engine Management
Compression Ratio: 9.3:1
Bore: 3.18 in - Stroke: 3.40 in
Stock Block
ATP 20v Turbo Manifold
GT28RS (Disco Potato)

Vehicle Pictures

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Vehicle Dyno

K03 10PSI vs. GT28RS 10PSI Turbo Upgrade 10 PSI

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