Spark Plug To Suit R33 Rb25Det..

[mjir33]

Hey Guys accidentally got given BCPR6E-11 spark plugs instead of BCPR7ES spark plugs would I be able to use these instead or do I need the sevens.. I know I would have to gap them down to .8 .. Just can't find the receipt to swap them over.. Thanks in advance

[Ben C34]

I use 7s.

They are a heat range cooler.

If your tune is good you won't foul them.

If If your car runs rich they might foul.

[mjir33]

Yeh it is running rich at the moment.. So 7's?

[Ben C34]

Oh. Sorry.

I misread your post.

Heat range 6 will be fine.

If your running rich you would like foul 7s.

[mjir33]

Cheers what is best to gap to the 7's I had in there were gapped to 6

[Ben C34]

You want to run the biggest gap you can without it misfiring.

[mjir33]

Cheers man.. So a .80 gap will do

[dyl33]

While we are on the subject, what heat range should I be using r33 gtst mods nistune,splitfire coils,12psi? 6 or 7 gapped at 1.1

[KiwiRS4T]

6 should be fine gap to 0.8mm

[mad082]

You only want to go 7s for high boost applications (aftermarket turbo). For standard turbo applications, or if the car sees a lot of traffic driving, then 6s are the better option.

As for gap, if you can run the 1.1mm gap and not get a misfire then do it. If it starts to misfire then reduce the gap until it doesn't. If you have good coils then you shouldn't need to reduce the gap. As been said earlier, when it comes to plug gap, bigger is better.

[dyl33]

Ok thanks that is what I thought was getting a little confused reading all the "what spark plug to use threads"

[Dose Pipe Sutututu]

bigger gap > smaller gap (only applies to motor vehicles)

smaller gap > bigger gap (applies to females)

box gap > no gap (applies to females)