New Plugs: At what level do you go one step colder? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-31-2010, 12:14 AM   #1
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Default New Plugs: At what level do you go one step colder?

What threshold do you guys use for determining when to go to colder spark plugs?
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Old 03-31-2010, 02:06 AM   #2
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Conceptually, you want plugs cold enough to prevent preignition but hot enough to not foul.

I would say for most of us the threshold is whether you're running forced induction or not. Most of the boosted folk run BKR7Es which are two steps colder than stock.

I am currently n/a but the car gets tracked so I went one range colder than stock with BKR6Es for a little extra protection against preignition. They run fine with no fouling issues.
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Old 04-01-2010, 12:43 PM   #3
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I ran the 7's at the 230hp mark. Ill go 8's at 400+ mark but only with nitrous. If your staying boost only I'd say bkr7es's should work great with what ever your stock internal engine can handle, even up to 400hp. FYI I had a ***** hard time finding the 7's. 8's were ever worse.
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Old 04-01-2010, 01:12 PM   #4
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As soon as I turned the boost up to 10psi on my Greddy kit, I had to go to 7s.

I thought the 7s were only 1 step colder than stock.
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Old 04-01-2010, 01:27 PM   #5
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I've always run 6s, and thought they were stock.

I also though going up a number was colder...but can hardly find 7s.
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Old 04-01-2010, 01:41 PM   #6
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Quote:
Originally Posted by gospeed81 View Post
I've always run 6s, and thought they were stock.

I also though going up a number was colder...but can hardly find 7s.

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Old 04-01-2010, 01:50 PM   #7
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they are the same as the integra type r
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Old 04-01-2010, 02:33 PM   #8
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BKR5E-11s are stock. If you go for a trip with long durations of cruising and have 7s, take them out and throw in a set of 6s, the 7s like to foul during long cruises.

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Old 04-01-2010, 02:40 PM   #9
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Quote:
Originally Posted by RotorNutFD3S View Post
BKR5E-11 are stock. If you go for a trip with long durations of cruising and have 7s, take them out and throw in a set of 6s, the 7s like to foul during long cruises.
In that case I'm running the right plug then. One step colder than stock, and good for my daily 150mile round trip.
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Old 04-01-2010, 05:08 PM   #10
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Quote:
Originally Posted by RotorNutFD3S View Post
BKR5E-11s are stock. If you go for a trip with long durations of cruising and have 7s, take them out and throw in a set of 6s, the 7s like to foul during long cruises.
Stock for 95 maybe, I believe 6's are stock heat range for the. 1.6
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Old 04-06-2010, 09:16 PM   #11
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Quote:
Originally Posted by FastColt View Post
Stock for 95 maybe, I believe 6's are stock heat range for the. 1.6
That's the consensus... 1.6s use 6 stock, one colder is 7. 1.8s come with 5 stock.
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Old 04-13-2010, 01:29 AM   #12
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oddly enough, the 1.8 BP in the escort GT/protege came with 6's stock.

i run 7's. BKR7E, part number 4644. advance auto stocks tons of them.
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