Changed plugs, now.................

[E-SWIFT]

So, I just hit 65K, so I decided to change my plugs since I went stage 2- single pulley ( I.E.). I changed out the OEM for 1 step colder ( NGK- BKR9EIX ).
I gapped them at .027-ish, loaded up with 93 octane and took out. WOW- at first it felt weaker than the night before, and I got some bumps while doing pulls.
Hum, so as I hit WOT, the EPC came on, and it went into limp mode. https://www.audizine.com/forum/image...s/bawling.gifI made it home, pulled on the coded reader, Misfire in cylinder #1. Hum........

So.......

I.E. says to gap them at .026, so .001 makes that large of a difference ?https://www.audizine.com/forum/image...s/confused.gif

Going 1 step colder would make a coil pack go ?

[bajan01]

BKR9EIX might be a bit too cold for single pulley (depends on your pulley ratio of course). Maybe try BKR8EIX gapped to 0.024”-0.026”.

[ericw.]

In addition to what was already posted, yes plug gap can make a world of difference.

I know someone who took half a second off their quarter mile just by playing with spark plug gap.

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[E-SWIFT]

So, this morning I bought a gauge feeler, went back and made sure they were all correct. Some were at .026, others were .029 / 0.30. I gapped them all at .026, changed the #1 coil pack and it ran perfect. Go figure.

[gk1]

Sounds like it is working fine for you now. Just be careful there was some reports of counterfeit NGK plugs on Amazon.

[paul-g]

Sounds like it is working fine for you now. Just be careful there was some reports of counterfeit NGK plugs on Amazon.

Or ebay

[07S6]

Has APR or other tuners ever recommended anything other than the stock OEM plugs for stage 2 tunes, whether single or double pulley?

[gk1]

Has APR or other tuners ever recommended anything other than the stock OEM plugs for stage 2 tunes, whether single or double pulley?

Good point.
APR states for Stage II dual pulley:
"The software was designed for use with NGK Iridium IX BKR9EIX spark plugs. "

Even their Stage III S6/S7 kit which surely generates a ton of heat only recommends an 8.
"NGK heat range 8 spark plugs gapped to 0.024" ±0.002" or 0.6mm ±0.05mm with a change interval of 10-15,000 mi or 16-24,000 km."

However, according to NGK... "A good rule of thumb is, one heat range colder for every 75–100hp added."

[E-SWIFT]

The NGK- BKR9EIX works ok, Car seems to be quick, just, not as quick as before.
So I got a set of BKR8EIX to try. I'll install them in the morning and see which performs better.

[JWebb_C7_Comp]

So, this morning I bought a gauge feeler, went back and made sure they were all correct. Some were at .026, others were .029 / 0.30. I gapped them all at .026, changed the #1 coil pack and it ran perfect. Go figure.

Coils and plugs were a pain in the butt on my old 335xi. With only APR stage 1 and 25k on my 18 A6, I’d assume I’ve got many miles left before needing to swap plugs and even think about coils?


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