HG Motorsport ignition coils for Audi V8 3.7–4.2 l (A4, A6, A8, RS4)

HG Motorsport high-performance ignition coils

Technical optimisation for maximum power: HG Motorsport High Performance ignition coils provide increased ignition energy and improved thermal stability for modern high-performance engines.

In modern vehicles, particularly those with uprated engines, original ignition coils quickly reach their limits. Misfires, uneven combustion and thermal overload can result. HG Motorsport High Performance ignition coils have been developed specifically 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: additional windings and high-quality copper wire provide improved energy transfer and consistently high ignition voltage.
• Increased ignition energy (+10% compared with OE): perfect spark plug supply throughout the entire dwell period, ideal for high-performance engines.
• Consistent energy delivery under high load: particularly suitable for turbocharged and supercharged engines that require stable ignition voltage over longer periods.
• Extended service life: high-quality insulation materials and optimised windings minimise thermal loads and protect against internal short circuits.
• Thermal resilience: continuous operation up to 120°C and stable operation up to 140°C without loss of performance.
• Optimised spark formation: stable ignition at high boost pressures and with richer mixtures, significantly improving combustion efficiency.

Ignition energy comparison

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

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

Even at a temperature of 140°C, the ignition energy of the HG Motorsport 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.
• As a replacement for OEM ignition coils: greater reliability and extended service life.

Winding structure and operation

The ignition coils use an optimised primary and secondary coil structure. The primary winding creates a strong magnetic field; when this field collapses, a high voltage is induced in the secondary winding. The increased number of windings and improved insulation ensure consistent ignition energy, even at high engine speeds and during load peaks.

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 the first 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 50 hours.
• Functionality at 140°C: HG Motorsport stable for up to 8 hours; OE performance drop after 4 hours.
• Insulation resistance (500 V): HG Motorsport > 20 MΩ; OE approx. 10 MΩ.

Compatibility: this coil replaces, among others, the following OEM part numbers: 077905115AB / 077905115B / 077905115C / 077905115E / 077905115F / 077905115H / 077905115K / 077905115P / 077905115Q / 077905115T.

Suitable for: Audi A4 II (B6/B7), Audi A6 II (C5) / III (C5/4B) / III (C6), Audi A8 I (D2) / II (D3) / III (4E) / III (D4) / IV (4H/D4), Audi RS4 II (B6/B7) / III (B8) / IV (B8/5), Audi S6 I (C4) / II (C5), Audi S8 I (D2) / II (D3).

Manufacturer’s vehicle data

• HG Hochleistungszündspulen Audi A4 A6 A8 3,7-4,2 V8 Motoren

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.