Spark Plugs And Gaps

[RB25 SKYLINE]

i ended up getting new oem coilpacks from adam on here (rbceffy25) and installed them two days ago. my car is now running like the day i got it back from the conversion, upgrade and tuning work. its running sweet as now, all the power is back. my old coilpacks had scorch marks so i guess three of them were arcing to the bracket that holds them in place.

now that this has been sorted, could i put back in the platinums with a 1.1 gap (heat range 5) and expect it all to be good. i was thinking that with the new coilpacks the gap could be a little larger than the 0.8 that i have the coppers adjusted to.

if its working good dont change it.

[KiwiRS4T]

As above don't fix what ain't broken. Stick with coppers. 0.8 or 0.9 should be fine and stick with the heat range.

[arrydjay]

I had a very similar sounding problem... bought a new set of plugs at .8 gap and the problem was still there..bought a set of second hand yellow jackets...problem still there...bought a brand new set of splitfires...problem still there...pulled the plugs out and gapped them to.65 and the problem was gone.

Try a smaller gap first.

[KiwiRS4T]

I had a very similar sounding problem... bought a new set of plugs at .8 gap and the problem was still there..bought a set of second hand yellow jackets...problem still there...bought a brand new set of splitfires...problem still there...pulled the plugs out and gapped them to.65 and the problem was gone.

Try a smaller gap first.

Try reading the whole thread. OP has got new OEM coils and now is running fine at 0.8mm gap. He has been to the .6 gap with the old coils and it did go ok but that gap might not give a big enough spark at higher revs/ power. Your post suggests to me that Splitfires are not as good as brand new OEM but its the first I've heard that new Splitfires won't work at 0.8mm. There may be something else wrong with your setup (wrong heat range for the plugs??). At one point I had a set of new Yellowjackets and they worked fine at 0.8mm. I just changed to OEM because I found a set at a good price.

[datto 1600]

yes gapping the plugs that low is just masking the problem, maybe check the coilpack loom and igniter if series1