lower/eliminate detonation with iridium

[casperfast]

ok, i have a 95 tsi running roughly 15 lbs. my previous vehicle was the same running 25lbs. however i never thought about this

i have always ran iridium XI plugs beacuse i get them free, but what is the best plug to run with less residual combustion that can cause detonation? i have already used to search however everything i find just says iridium is too expensive and to go with bpr6es. but i dont want to know the cheap and best. i want to know what THE best plug is.
i know cold plugs reduce detonations, but charged air/fuel requires more of a spark. can someone help me.

 

[dsmconvict]

I'm goin with the BPR6ES in my car. From what I've heard you're supposed to use copper plugs in a turbo car. And that iridium plugs were bad. I know it's somewhere on this site so.

 

[kenamond]

If the plug is too hot, yes, you're more prone to knock. But if you're too cold, deposits can foul the plug. As for having enough spark, set your gap correctly. At 15psi, I'd recommend the BPR6ES gapped to 0.028". Somewhere around 17psi seems to be the point where you start considering a colder plug, but I'm sure that depends on how well you're cooling the charge, how efficient the compressor is at that boost, etc. I've heard that the iridium plugs should be avoided, so I never tried them. The NGK plugs are only $2/ea, but if you can get iridiums free and they work, free's free.

 

[luv2rallye]

I'm goin with the BPR6ES in my car. From what I've heard you're supposed to use copper plugs in a turbo car. And that iridium plugs were bad. I know it's somewhere on this site so.

Here we go again: http://www.dsmtuners.com/forums/problem-diagnosis/198308-spark-plugs-13.html#post1642842

 

[CrazyM]

I just found this plug list and thought it may be helpful in this thread...


The following is the resistance measured in ohms/ft by each major ignition wire distributer.

(low = good, high = bad)

MSD Ignition 8.5mm Super Conductor (40-50 ohms/ft)
Accel Thundersport (150 ohms/ft)
Taylor 8mm Spiro Pro (350 ohm/ft)
Aurora ignition wire set (400 ohms/ft)
Vitek Performance Cables (their web site does not mention resistance, but John Monnin measured them at about 800 ohms/ft; the label under Vitek's braiding says "Magstar Gold 8mm High Performance S-4 Stainless Steel Mag Wire" - thanks John!; Magstar wires are manufactured by Wiretec)
Wiretec Magstar Gold (800 ohms/ft as measured by John Monnin)
NGK Resistor Spark Plug Wire Set (2600 ohms/ft)
Mitsubishi factory wire sets (3000++ ohms/ft)
Car Quest brand wire sets (3000++ ohms/ft - Thanks to Bret for measuring these wires.)
Magnecor KV85 (6000++ ohms/ft)