RB26 Spark Plug Guide

The RB26 is a well proven turbo 2.6L found in a wide range of Nissans throughout the 90s and early 2000s such as the Skyline R32, R33 and R34 GTR. The RB25 & RB20 (little brothers to the Rb26) also packs a big punch and could be found in the Skyline r32, r33 gts and R34 gtt. With a few basic mods and general maintenance the RB26 and RB25 are reliable power plants ready to make you smile with every drive.

To help ensure you get the most out of your RB it is key to run a quality set of spark plugs. Spark plugs are responsible for starting the combustion cycle that powers your engine. With NGK spark plugs you are assured your plugs are providing a hot reliable spark to ignite the air/fuel mixture in each cylinder. Below is a list of the best ngk spark plugs for the RB26 and RB25 engines. These iridium core plugs are available in 4 popular heat ranges to suit any RB engine build. To make things easy we have listed out the correct ngk spark plug based on horsepower output from your RB. If you have any questions feel free to comment below or give us a call.

RB26 and RB25 NGK iridium spark plugs

Stock – 400hp BKR6eix-11
400-500hp BKR7eix-11
500-600hp BKR8eix-11
600hp+ BKR9eix-11

Iridium core ngk plugs are an easy bolt-in upgrade, the -11 in the part number means the plugs come pre gapped to 1.1mm ensuring a reliable spark under high boost conditions. If you find you need to a gap the plugs down tighter you should consider upgrading your ignition coils to either the R35 coils, PRP R35 COP, haltech IGN1 coils or AEM IGN1 smart coils.

Iridium core plugs hold up to heat better and last longer than their copper core brothers such as the ngk bkr7e spark plugs. For these 2 reasons you can find the Iridium core ngk plugs in everything from our purpose-built RB powered track cars to turbo street cars.
Our partners at FFrides keep a HUGE inventory of all the popular ngk spark plugs ready to ship at your convenience. If you don’t remember the last time you changed your plugs or you simply want to ensure your car is running perfectly, swap in a fresh set of ngk plugs and enjoy!

Spark Blow Out

Any high power engine makes its power through high cylinder pressures. These high pressures put the spark plug and ignition coil to the test. As spark plugs wear out the resistance increases this increased resistance combined with high cylinder pressures results in “spark blow out”. Spark blow out is a situation where the spark fails to arc from the spark plug’s electrode to the grounding strap causing a misfire and loss of power. Running NGK iridium plugs helps to ensure your engine will not suffer from spark blow out even under high boost high cylinder pressures situations. NGK iridium plugs have proven to last longer and perform better than any other spark plug option on the market both on and off the race track.

RB26 NGK Spark Plugs (Copper core)

For the best possible performance we do always recommend running an Iridium core NGK spark plug in the RB26/RB25 engine. However we also offer copper core NGK spark plugs for the RB. Copper core plugs are the OEM spec plug for the RB26/RB25 and do work well just not as good as the Iridium core NGK plugs. As mentioned above the life span of the a copper core spark plug will be MUCH shorter than that of an Iridium core plug. The copper core plugs will also need to be “gapped down” for any RB engine running more than the factory boost levels. The upside of the copper core NGK spark plugs is they are VERY affordable/budget friendly.

RB26/RB25 NGK Copper Core Spark plugs:

Stock – 300hp BKR6E Spark Plug
300-450hp BKR7E Spark Plug
500hp + BKR8eix-11 (For any RB engine making 500+ whp we highly recommend running Iridium core plugs. At this power level the copper core plugs will not last long and cause spark blow out issues/loss of power. Using the correct Iridium plug and a good set of ignition coils is key to reliably making over 100HP per cylinder.)