HG Motorsport ignition coils for BMW S58/B58/B48/B46

Technical optimisation for maximum power

HG Motorsport high-performance ignition coils

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 be the 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: additional windings and high-quality copper wire provide improved energy transfer and consistently high ignition voltage.
• Increased ignition energy (+10% compared with OE): reliable spark-plug supply throughout the entire dwell period, ideal for high-performance engines.
• Constant energy output under high load: particularly suitable for turbocharged and supercharged engines that require stable ignition voltage over longer periods.
• Extended service life: high-quality insulating materials and optimised windings minimise thermal loads 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 pressures 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 standard ignition coils drops significantly, 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 decisive at high engine speeds and in uprated 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 track days: 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: increased reliability and extended service life.

Winding structure and operation

The ignition coils use an optimised primary and secondary coil structure. The primary winding generates a strong magnetic field; when this field collapses, high voltage is induced in the secondary winding. Thanks to the increased number of windings and improved insulation, consistent ignition energy is maintained 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: the HG Motorsport ignition coils showed no reduction in performance and no thermal degradation.
   Comparison: OE ignition coils lost approximately 25% of their energy after 50 hours, followed by initial material changes.
2. 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.

Replacement for original part numbers

The ignition coil replaces the following OEM numbers: 12137, 12138, 121384, 1213847, 7619385, 7619385.05, 761938505, 8647463, 8647463.01, 864746301, 8678438, 8678438.01, 8678438.01, 867843801.

Suitable for: BMW 1 II (F20/F21) / III (F40) / IV (F70), BMW 2 I (F22/F23/F45/F46/F87) / II (G42/G87/F44), BMW 3 VI (F30/F31/F34/F80) / VII (G20/G21/G80/G81), BMW 4 I (F32/F33/F36/F82/F83) / II (G22/G23/G26/G82/G83), BMW 5 VII (G30/G31/F90) / VIII (G60/G90) / VIII (G61/G99), BMW M2 II (G87), BMW M3 VII (G20/G21/G80/G81), BMW M4 II (G82), BMW X1 II (F48) / III (U11), BMW X2 I (F39) / II (U10), BMW X3 III (G01) / IV (G45), BMW X4 II (G02), BMW X5 IV (G05/F95), BMW X6 III (G06/F96) and 2 more.

Manufacturer’s vehicle data

• HG Hochleistungs Zündspule BMW S58 B58 B48 B46 Serie

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.