Another plug recommended by 930 owners is the Denso IW24.
Denso plug catalog
IW24:
- 14mm dia x 19mm length, hex 20.6
- gap of 0.7mm
- Resistance of 5000 Ohms
- projection of 1.5mm for "focus on heat resistance"
- spark position of 1.5mm is .5mm from normal (1.0mm)
- 0.4mm diameter iridium
- typically around $10 apiece
None of the plugs in this section are non-resistor.
Note that there is an "Iridium racing" brand/line around page 44, and "IW06" are all non-resistor.
"All IRIDIUM RACING plugs specify a resistor, and contain a highly reliable monolithic-type resistor that blocks noise that may affect electronic devices. (IW06 has no resistor.)"
IW06 plugs:
- 14mm dia x 19mm reach, 20.6 hex
- gap 0.6
- projection of 1.5mm
- ground electrode height 1.6mm
There are 3 heats (
cross-ref via this chart):
- 27 - NGK 9, Bosch 3 - Denso P/N: 067600-1811 (IW06-27) (alt P/N: 5744)
- 31 - NGK 10, Bosch 2 - Denso P/N: 067600-1821 (IW06-31) (alt P/N: 5745)
- 34 - NGK 11, no Bosch equivalent - Denso P/N: 067600-1831 (IW06-34) (alt P/N: 5746)
And ironically the prices I see for the Denso 067600-1811 (which matches the same heat as the Bosch W3DP0) are $40 and up apiece.
It does look like some shops in Japan are selling them for around $20US.