Miata Turbo Forum - Boost cars, acquire cats.
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Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
-   Engine Performance (https://www.miataturbo.net/engine-performance-56/)
-   -   What spark plug gap? (https://www.miataturbo.net/engine-performance-56/what-spark-plug-gap-40931/)

Doppelgänger 11-09-2009 07:31 AM
I've been able to run .035"-.037" on the stock 01+ coils + Magnacore wires + NGK race plugs.

triple88a 11-09-2009 10:20 AM
Yeah i measured the stockers and they were about 37-38
i made the new ones 33

NAshowdown95 12-01-2009 12:48 AM
Recommended spark plugs/gap for 95 on 7psi, stock coils?

Was assuming to go with BKR7E's but unsure of a correct gap...

Guess there really is no definitive FAQ on proper spark plug choice and gap?

therieldeal 12-01-2009 08:44 AM
i'm running ~0.032 on BKR7E but thats with a blaster II coil and a distributor... its a little easier for me to upgrade than you guys :)

NAshowdown95 12-01-2009 07:23 PM
lucky :) lol very impressive car man!

anyone else running BKR7E?

18psi 12-01-2009 07:24 PM
Yes. Many people.

triple88a 12-01-2009 07:32 PM
Originally Posted by NAshowdown95 (Post 489268)
anyone else running BKR7E?
thats the standard plug recommended for turbo miatas

NAshowdown95 12-01-2009 08:08 PM
18psi,triple88a...thanks for the info guys.


Whats the recommended/common gap on those plugs on stock 1.8 coils?

18psi 12-01-2009 08:42 PM
.035-.030 is what mine are set to.

MartinezA92 12-01-2009 11:01 PM
Whats stock plug gap anyway? Just for an N/A engine? (Not COPs)

18psi 12-01-2009 11:07 PM
I think its somewhere in the high 40's low 50's? Just guessing

triple88a 12-01-2009 11:09 PM
Originally Posted by 18psi (Post 489427)
I think its somewhere in the high 40's low 50's? Just guessing
Lol he did say NOT cops :)

from what i've found 35-40 is good.

ScottFW 12-01-2009 11:49 PM
Mazda specs the stock gap at 1mm because, that's right, they've got the metric system! If you do the math it's pretty close to .040" which is a nice easy number to remember.

Being still N/A I haven't felt compelled to run BKR7Es but I do run BKR6Es (one heat range colder than the stock BKR5E) because it hits the track a few times a year. On a totally stock street only car I don't see any need to run colder than stock plugs.

MartinezA92 12-02-2009 12:29 AM
Originally Posted by ScottFW (Post 489460)
Mazda specs the stock gap at 1mm because, that's right, they've got the metric system! If you do the math it's pretty close to .040" which is a nice easy number to remember.

Being still N/A I haven't felt compelled to run BKR7Es but I do run BKR6Es (one heat range colder than the stock BKR5E) because it hits the track a few times a year. On a totally stock street only car I don't see any need to run colder than stock plugs.
0.03937 to be exact. ;)
The OCD in me had to say something.

cjernigan 12-02-2009 01:12 AM
I ran .025 with the wrong spark resistor in my MS with stock '99 coils.

simonetrb 12-11-2009 09:56 AM
I just turbo'ed my car, with an HKS kit w/o intercooler boosted at 5,8 psi:

I bought NGK BKR7EIX-11 where 11 stands for the 0,043" gap...

It is the standard gap of the NA version, could it be too much?

I tried to boost @ 6,5 psi and i heard it knock, could it be because of the plugs' gap?

what if the gap is too much??

Braineack 12-11-2009 10:01 AM
then you'll have spark blow out issues, and no spark = no boom = no detonation.

lycos 12-13-2009 12:52 AM
lol

simonetrb 12-13-2009 08:51 AM
Originally Posted by Braineack (Post 494203)
then you'll have spark blow out issues, and no spark = no boom = no detonation.
i didn't really understood what you meant...

anyway I put the gap at 0,035"...

It went good...

I tried the car on the motorway and reached 6500 rpm in 6th gear at 225 kmh...

It seems it is good!!


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