Iridium spark plug. Porsche 930 Turbo 1975-89 / 924TT 79-85  ❭  99917012891

Iridium spark plug BPR8EIX - (Bosch ref W3DP / W3DP0)
Original equipment iridium spark plug, engineered to Porsche factory standards for turbocharged classic engines. Featuring a high-grade iridium centre electrode, this plug offers enhanced durability, precise ignition performance, and long service life while maintaining full OE compatibility.
Sold individually, 6 Required for 911 engines / 4 Required for 924 engines.

Fits:
Porsche 930 3.0 Turbo 01.75 - 12.77 191kw 260hp Engine type 930.50, 930.52
Porsche 930 3.3 Turbo 06.86 - 08.89 221kw 300hp Engine type 930.66

Porsche 924 2.0 Turbo 06.80 - 10.86 130kw 177hp Engine type M31.03

Porsche 911E 2.0L 09.68 - 12.69 103kw 140hp Engine type 901.09, 901.11
Porsche 911S 2.0L 07.66 - 11.68 118kw 160hp Engine type 901.02 901.08
Porsche 911S 2.0L 09.68 - 12.69 125kw 170hp Engine type 901.10
Porsche 911E 2.2L 09.69 - 12.71 114kw 155hp Engine type 911.01, 911.04
Porsche 911S 2.2L 09.69 - 12.71 132kw 180hp Engine type 911.02

This iridium spark plug ignites the compressed air-fuel mixture inside the combustion chamber, enabling controlled combustion and efficient power delivery. The fine iridium electrode produces a strong, focused spark, helping turbocharged engines achieve smoother running, improved throttle response, and reliable ignition under higher cylinder pressures.

Functions & Technical Role:
•  High-energy ignition spark for efficient combustion
•  Iridium electrode technology for exceptional wear resistance
•  Improved ignition stability under turbocharged operating conditions
•  Enhanced cold starting performance
•  Reduced misfires and uneven running
•  Factory-matched heat range & gap for Porsche turbo engines
•  Longer service intervals compared to conventional spark plugs

Spark plugs are critical to combustion efficiency, especially in turbocharged engines where cylinder pressures are higher. Over time, electrode wear and carbon build-up reduce spark quality, leading to misfires, poor boost response, and reduced performance. Replacing worn plugs restores reliable ignition, protects engine components, and helps maintain smooth, consistent power delivery.

When to replace spark plugs:
•  At Porsche-recommended service intervals
•  During routine servicing or ignition system checks
•  If experiencing misfires, hesitation, or rough idle
•  When cold starting becomes more difficult
•  If boost response or performance drops
•  During engine rebuilds or restorations
•  After long-term vehicle storage before returning to use

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99917012891

The product you are viewing cross references to these numbers