What threshold do you guys use for determining when to go to colder spark plugs?

 

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.

 

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.

 

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.

 

I've always run 6s, and thought they were stock.

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

 

Napa
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they are the same as the integra type r

 

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.

 

In that case I'm running the right plug then. One step colder than stock, and good for my daily 150mile round trip.

 

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.

 

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.