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View Full Version : SR20DET NGK BKR6E or BKR7E for Stock Boost and Better Gas Mileage?

zbear
10-22-2008, 05:12 PM
On an SR20DET, which plugs are better if I'm running stock boost 7psi and looking to get the best gas mileage out of my SR?
sliEighty
10-22-2008, 05:13 PM
I run the 7s on my car and it runs fine. id say go with the bkr7e. I got a box of 20 from napa for like 20 bucks.
motegineon
10-22-2008, 05:31 PM
yea i run 7's too, just get the gap correct, thats really important
Somnambulist
10-22-2008, 05:34 PM
On stock boost? No need to go with the 7s. 6s will be just fine.

Now if you're running more boost on a bigger turbo, then you'll need a colder spark plug such as the 7s.

At least that's always what I thought.
zbear
10-22-2008, 07:06 PM
Everyone seems to running 7s, but I'm at stock boost so I think 6s would produce a hotter cleaner combustion, therefore better gas mileage.

With 7s at stock boost, wouldn't this produce a colder and less efficient combustion or would they be as efficient as 6s?

I'm not looking for power, just a reliable DD that doesn't suck up gas.
aNskY
10-22-2008, 07:14 PM
i always ran the 7's, even when i was stock and dd'ing the s14, averaged 28-29mpg with the 7's at .028
Massimo Power
10-22-2008, 07:18 PM
Yes i would suggest BKR6 as they would be better for stock boost... rule of thumb we use is for every 75hp over stock we go one colder..

I run the 7s on my car and it runs fine. id say go with the bkr7e. I got a box of 20 from napa for like 20 bucks.

I think you mean Box of 10 as NGK doesnt sell boxes of 20.. :)

I also Sell the Coppers For $2 a peice and i sell the Iridiums for $6.50ea

So if interested i know thats cheaper than everyone else.. :)

Shipping and tax is of course extra but not rediculous.. :)
moses
10-22-2008, 08:11 PM
Since i should be around the 300hp+ (hopefully), are you saying i should go with bkr8 with a .028 gap? I figured bkr7 would be good.
Massimo Power
10-22-2008, 08:15 PM
Stock plugs will work good for over 75hp-100hp .. then after 75hp-100hp more than stock.. go one colder.. and so on.. :)
sliEighty
10-22-2008, 08:29 PM
ha yea my fat fingers mess with me again i mean ten plugs
SoSideways
10-23-2008, 07:52 AM
Stock boost is 10psi.

7psi is just running off of the wastegate.