[grey99max]

Originally Posted by Jime

Maybe just too much timing. I back off about 4 deg for the big shots and have been using these for 4 years. If the timing is too high it doesn't matter what plug you use it will melt. However I like being able to have different timing maps for n/a, light shot and heavy shot, it makes life a lot easier and I don't even have to use race fuel anymore, just good ole 94 Sunoco. Thank you UTEC.

Mine are 2 steps colder and I use them for n/a as well. They were in my car for my record n/a run and record nitrous runs.

So you think plug meltdowns are caused by too much advance? I've heard and read some about that.

I'm still using the stock ECU, and you know what that curve looks like... when I cut back the ground straps and used VP Racing 109 race fuel, all the plug meltdowns just stopped. I see that the true NGK racing plugs have recessed tips ( ? iridium ? ) which are highly recommended for "true race engines".

I did rebuild my fuel delivery system from "tank to crank" and now all the plugs look like they should. I had very uneven fuel supply to the rails and I think the 300ZXTT fuel filter wasn't up to the job, so it got changed out too.

Never a dull moment on the track, eh? Great job at MIR last weekend.

.