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Oil and sparkplugs for RB25DET?

DennisRB30
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  • 1 month later...
rev210 Grand Master

rev210

Posted
Posted
Originally posted by Sydneykid

Sorry Dennis, that wasn't me, it was Zahos.  We use NGK BCPR7ES-11 gapped at 0.9 mm in the race GTST.  When it starts missing I spend $18 and buy a new set.  The road car gets PFR5A-11's gapped at 1 mm.   I've not had any problems with this combo and they are cheap enough, so never bothered trying anything else.

Hope that helps.

What do you know the same plug and gap as me!

BCPR7ES-11's gapped to 0.9mm.

I still haven't fully tuned the plug side yet.

The Rule of thumb for NGK plugs I use and many others.

PART 1.

5's for 5,000rpm

6's for 6,000rpm

7's for 7,000rpm

8's for 8,000rpm

9's for 9,000rpm

(Where the rpm is the peak horsepower range of the engine or the peak rpms most commonly used).

PART 2.

Aim for a generous gap when aiming for good peak power.

6's may work at 8,000rpm (If this is where your peak power ought to be) if you close the gap enough. They certainly won't work as well as 8's with a decent gap. The trade off being that 8's won't tollerate around town driving as well unless you give it 8,000rpm around every corner.

It's a basic rule of thumb and not perfect.

For those interested on my opinion of the platinum and iridium plugs; both are better than copper. Only in reliable spark and not in power production (not enough to notice). Get the plug setup wrong and you have to turf them anyway... better a cheap ass copper set than expensive iridiums.

my 2c

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