NGK R5671A V-Power Racing Forced Induction Spark Plugs For Mazda MX-5 NA & NB
Supplied as shown, the price is for a set (4) spark plugs.
Get the best spark you can out of your ignition system with these resistorless race spark plugs, we run these on our personal cars and find they respond very well, benefiting from improved throttle response and less spark blowout issues at higher boost levels.
When turbocharging or adding any form of forced induction to an engine, care needs to be taken around controlling detonation of the mixture. As you build more and more power the heat and pressure in the cylinder increases; changing to a spark plug that is ‘one step colder’ reduces the heat at the surface of the spark plug, which can become a hot zone and a cause of detonation. Depending on your specific application, you can move up to four ‘steps’ colder with these plugs.
|Plug(R5671A)||Number of steps|
These are all pre-gapped at 0.8mm.
Copper plugs provide the best conduction, they are easily gapped without damage and don’t foul as easy – that’s why we recommend them over the much more expensive iridium plugs