[s-cars] Re. Spark plug

[Wylie Bean]

I ended up tossing the iridiums because I had been running the car with a bad miss and ultimately had an OE coil catstrophically fail, on top of what was likely a failed POS channel, and a failed FPR(all in the span of 2 days!) When I pulled them they looked horrible so I went with the coppers when I switched over to the Apikol 1.8T harness and coils.  I really hoped that would cure the hiccup, but no dice. About the only thing I haven't switched is the WGFV and the EGR valves. WG diaphragm is good, as N75 BPV is a new 110N. 
Wylie Bean
TheRingmeister at triad.rr.com
90 cq
91 90q20v
92 UrS4
08 Q7 3.6
via BlackBerry®

-----Original Message-----
From: qshipq at aol.com
Date: Tue, 14 Dec 2010 12:54:25 
To: <theringmeister at triad.rr.com>
Cc: <s-car-list at audifans.com>
Subject: Re: [s-cars] Re. Spark plug


 IME with iridiums, 60k is a reasonable CI, likely more, especially on a stock application.  NGK went after 200k CI target on normally aspirated cars.  I would agree that the hiccup is not a spark plug problem if you swapped and have the same problem.  The coppers will have lower spark fire voltage, but IME with coppers in turbo apps, 10k is about my comfort limit in terms of wear.  Copper wears very quickly in turbo applications....  I'd put the iridiums back in, you were less than half the service life when you took them out.

To the comments about platinum being 'cheaper' that iridiums, that's because iridium/rhodium is more expensive in both raw material and manufacture than platinum.  The material also lasts twice as long as platinum in the combustion chamber, requires less voltage to fire, and will fire under lean conditions better, so the cost per mile on the plug comes out less...   if you do the math.

Cheers

Scott J



 


 

 

-----Original Message-----
From: Wylie Bean <theringmeister at triad.rr.com>
To: qshipq at aol.com
Cc: S-CAR list <s-car-list at audifans.com>
Sent: Tue, Dec 14, 2010 11:07 am
Subject: Re: [s-cars] Re. Spark plug


So in my case, where I installed a set of NGK BKR7E coppers (replaced 30K mile 

NGK BKR7EIX iridiums) doing some troubleshooting of a random "hiccup" under load 

(which is still ongoing) in an unchipped AAN, what do you suppose the change 

interval would be, or should I just pull them and switch back to Iridiums?



  

Wylie Bean

TheRingmeister at triad.rr.com

90 cq

91 90q20v

92 UrS4

08 Q7 3.6

via BlackBerry®