Might be the crank sensor that's not set just so. Was it a violent misfire?

What power level are you expecting?

What's the coldest heat range then (NGK)?

So if you run 500+ bhp you need NGK head range 9?

BKUR7RET is a colder NGK plug which you can use, I am currently running these

There' used in some 3lite+ Porsches too, no probs in my 16vt.
What's thus about ignition?? I go on dinks site but I can't find any English on there ? Thanks mike

Kj would you recommend these for my setup?

I thought you weren't supposed to gap the Iridiums?

Will try those BR8EIX too then.

That's correct, ideally you shouldn't gap them as it is easy to damage the iridium tip.

I no longer use Iridium plugs as a rule due to seeing too many failures on all sorts of cars i.e. cracked insulator, missing insulator etc. Unfortunately some cars have a limited range of what is available, therefore I will always choose the correct heat range first and foremost, so if this ends up being an Iridium then so be it. However, a long life plug is not required for a performance car, just change after 5-10k. Therefore using a good copper racing plug with the correct heat range and gapped accordingly is my recommendation for all customers. I also prefer to use a non-projected tip on high boost applications.

[/quote] i've heard that some blew in 16vt! beware!

That is the reason I never tried them before.

I also prefer to use a non-projected tip on high boost applications.

I know you were trying to be helpful, Burnbike so please don't take this as me getting at you

Posts like that don't help anyone. Forums are too full of advice based on vague hearsay and it just confuses people and causes people to make ill formed decisions. Everybody wants to take care of their engines so naturally they get panicky when somebody says "OMG, Don't buy -insert item- because my brother said that his mates, mate said he had -insert item- on his -insert vehicle- and it blowd up!!"

If going to recommend anything always make sure you can back it up with personal experience, or at least some direct evidence (not 3rd hand info off a forum 8 years ago!). eg. what blew when, where, why, under what circumstances, etc, etc.

I recommended iridiums to Deme for his particular application because I've actually spent the time and money testing all of these plugs on my own 16VT. In fact anything I recommend or don't recommend to anyone is because I've used it, or tested it myself. So let's all not get on a 'iridium plugs sux' bandwagon because they don't.