NGK Iridium spark plugs

NGK iridium spark plugs

NGK is the most sold spark plug brand globally and in Finland.

The strongest expertise comes up range to the extent, quality and uniformity of reliability. Motorists, boaters, snow mobilers, motorcyclists and moped riders have taken the first choice when they need a reliable ignition.

Common plugs shortlist

Engine	OE	NGK's stock	NGK's colder
Nissan 200sx CA18DET	NGK PFR6A-11	BKR6EIX	BKR 7/8 EIX
Nissan 200sx SR20DET	NGK PFR6B-9	BKR6EIX	BKR 7/8 EIX
Nissan Skyline RB25DET	NGK BKR6EP11	BKR6EIX	BKR 7/8 EIX
Nissan Skyline RB20DET	NGK BKR6EP11	BKR6EIX	BKR 7/8 EIX
Nissan Skyline RB26DETT	Denso Q20TT	BKR6EIX	BKR 7/8 EIX
Nissan 350z VQ35DE	NGK PLFR5A-11	LFR5AIX-11	LFR 6/7 AIX-11
Nissan Maxima VQ30DE	NGK PFR6B-11	BKR6EIX	BKR 7/8 EIX
Toyota Supra 1JZ	NGK BKR6E	BKR6EIX	BKR 7/8 EIX
Toyota Supra 2JZ	NGK BKR6E	BKR6EIX	BKR 7/8 EIX
Toyota Supra 7M-GTE	NGK BKR6EP-N8	BKR6EIX	BKR 7/8 EIX
Subaru Impreza EJ205	CHAMPION RC10YC4	BKR6EIX	BKR 7/8 EIX
Subaru Impreza EJ207	CHAMPION RC10YC4	BKR6EIX	BKR 7/8 EIX

Rule of thumb: For stock cars, get the OE heat rating. Mildly tuned (exhaust, filter, etc.), get one step colder, and with more boost / cams or other serious tuning get two steps colder.

In Brisk heat ratings a lower number is hotter, and a higher colder. Here is a spark plug heat range comparison chart. In tuned engines you can usually use a one or two step colder plug.

DENSO	NGK	CHAMPION	BOSCH	BRISK
9	2	18	10
14	4	16,14	9
16	5	12,11	8	17
20	6	10,9	7,6	15
22	7	8,7	5	14
24	8	6,63,61	4	12
27	9	4,59	3	10
29	9.5	57		10 or 8
31	10	55	2	8
32	10.5	53
34	11
35	11.5