HG Motorsport ignition coils – conversion kit for VAG 1.8T 20V

VAG 1.8T 20V Turbo ignition coil conversion kit

This conversion kit allows all 1.8T engines with the older rectangular ignition coil connector to be converted for use with modern high-performance TFSI ignition coils.

1.8T engine electronics with cable-operated throttle (ME3.8), e.g. AGU / AEB

Required:

• ignition coil adapter plate
• adapter wiring loom

Note: The adapter wiring loom is a complete set for 4 ignition coils.

Electronic throttle (ME7.x) and eGas

Required:

• ignition coil adapter plate

An adapter wiring loom is not required for this version.

Technical upgrade for maximum performance

HG Motorsport high-performance ignition coils provide increased ignition energy and improved thermal stability for modern high-performance engines.

In modern vehicles, particularly tuned engines, original ignition coils quickly reach their limits. Misfires, uneven combustion and thermal overload can result. HG Motorsport high-performance ignition coils have been specifically developed to overcome these challenges. They provide increased ignition energy, improved thermal stability and consistently reliable performance, even under the most demanding conditions.

Technical features of the HG Motorsport ignition coils

• Optimised primary and secondary windings: more windings and high-quality copper wire improve energy transfer and provide a consistently high ignition voltage.
• Increased ignition energy (+10% compared with OE): optimum spark plug supply throughout the complete dwell period, ideal for high-performance engines.
• Consistent energy output under high load: particularly suitable for turbocharged and supercharged engines requiring a stable ignition voltage over longer periods.
• Extended service life: high-quality insulation materials and optimised windings minimise thermal stress and protect against internal short circuits.
• Thermal resistance: continuous operation up to 120°C and stable operation up to 140°C without loss of performance.
• Optimised spark formation: stable ignition even at high boost pressure and with richer mixtures, significantly improving combustion efficiency.

Ignition energy comparison

The diagram shows the superior ignition energy of the HG Motorsport ignition coils compared with standard components:

• Up to 1.5 ms: both coil types deliver comparable energy.
• From 2.0 ms: the energy of the standard ignition coils drops noticeably, while the HG Motorsport ignition coils continue to deliver consistently high values.
• At 3.0 ms: the HG Motorsport ignition coils deliver almost 25% more energy, which is crucial at high engine speeds and in tuned engines.

Even at a temperature of 140°C, the ignition energy of the HG Motorsport ignition coils remains stable at 70 mJ, while OE coils have already failed or reached critical values.

Ideal applications

• High-performance engines: optimum ignition even under extreme loads.
• Motorsport and trackdays: stability and consistent energy during continuous operation.
• Daily drivers with increased power: improved efficiency and ignition stability in everyday use.
• Replacement for OEM ignition coils: greater reliability and a longer service life.

Winding structure and operation

The ignition coils use an optimised primary and secondary winding structure. The primary winding creates a strong magnetic field; when this field collapses, it induces a high voltage in the secondary winding. The higher number of windings and improved insulation ensure consistent ignition energy even at high engine speeds and during peak loads.

Thermal testing and long-term results

1. Continuous thermal load

• Test setup: continuous operation at 120°C with simulated load changes over 100 hours.
• Result: no reduction in performance and no thermal degradation of the HG Motorsport ignition coils.
• Comparison: OE ignition coils lost approximately 25% of their energy after 50 hours, followed by initial material changes.

Additional test at 140°C

• HG Motorsport: stable operation for 8 hours without failures.
• OE ignition coils: performance drop of up to 40% after 4 hours, followed by thermal failures.

Summary of laboratory data

• Maximum ignition energy: HG Motorsport 120 mJ; OE ignition coil 90 mJ.
• Continuous load at 120°C: HG Motorsport > 100 hours; OE ignition coil 50 hours.
• Operating capability at 140°C: HG Motorsport stable for up to 8 hours; OE ignition coil performance drop after 4 hours.
• Insulation resistance (500 V): HG Motorsport > 20 MΩ; OE ignition coil approx. 10 MΩ.

Compatible original part numbers

This conversion kit can replace the following OEM numbers: 06A905115, 06A905115A, 06A905115B, 06A905115C, 06A905115D, 06B905115D, 06B905115G, 06B905115H, 06B905115J, 06B905115L, 06B905115M, 06B905115N, 06B905115P, 06B905115R, 06B905115S, 06B905115T, 06B905116J, 06B905117L, 06C905115C, 058905101, 058905105, 06B905105, 06B905115, 06B905115B, 06B905115E.

Suitable for: Audi A3 I (8L), Audi A4 I (B5) / II (B6/B7), Audi A6 II (C5) / III (C5/4B), Audi TT I (8N), SEAT Alhambra I (7MS) / I (7V8/7V9), SEAT Ibiza II (6K1) / III (6L1), SEAT Leon I (1M1), SEAT Toledo II (1M2), Škoda Octavia I (1U2) / I (1U5), Škoda Superb I (3U4), VW Beetle I (9C), VW Bora I (1J), VW Golf IV (1J), VW New Beetle I (1Y7) and 3 more.

Manufacturer’s vehicle data

• HG Motorsport Hochleistungs Zündspulen Umbausatz VAG 1,8T 20V

Original product name by HG Motorsport (»z.B.« = e.g.). Please check model, year and engine of your vehicle before ordering; if in doubt, contact us and we will check for you.

Included in the price

HG Motorsport 1.8T 20V ignition coil adapter.