i know of several 2.5T and 2.0T (big turbo) running BKR7EIX gapped at 0.028"... Myself included, and no issues.
I am running those in my car now and they are perfect!!
Personally I prefer NGK and have had excellent results on our customer's cars with NGK. They make a great plug.
On almost all FSI / TSI applications we prefer the NGK, either PFR7S (which is the 'oem' plug on most TSI engines we see) or PFR7Q gapped to .028. We have had bad luck with missfires with the Bosch on tuned cars. Stock seems fine.
I honestly can't say if you're low/high or I was low. What I can say is on my 9A 2.0 16v (rough guesstimate 185k miles)... NGK iridium plugs (standard gap)
I was having some stuttering/mis-firing at high boost on the spark plugs so I switched to the NGK BKR7E with a .028 gap. Right away I noticed a huge improvement but I can't help but feel it could be better.
From my own experiences the raceplugs seem to help with misfire happy maps.
im still running the NGK BKR7E's at a .026 gap with 11 psi, they do foul quickly but I plan to keep changing them every oil change.
Just reporting in after some usage... the NGK 4644 aka BKR7E seems to foul easier than the Autolite plugs I ran previously.
I changed them over to the NGK bkr7eix #2667 and was wondering if spark plugs would have any effect on boost? It seems like the car isn't boosting as it should, I have a boost gauge and it also seems the PSI is a couple LBs lower than before the spark plug change. I have not experienced any misfires (that I can tell) and no CEL it's just the boost doesn't seem as high.
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