Thread: BKR5EIX-11 ngk spark plugs

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2011-03-08 22:24:29

lynchfourtwenty Online/offline status of lynchfourtwenty is unknown

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BKR5EIX-11 ngk spark plugs

well i just checked my plugs the other day an that's what I'm running, they look perfectly fine, but the tips where the plug wire goes on are showing age so I'm planning on replacing them.. i realize most people run the 6 heat range plugs and i also see there's some controversy over the regulars and the 11's ..

so my question is, would i possibly make better power and or possibly better gas mileage with the 6 heat range plugs? and should i stick with the -11's or should i get the regular ones? also am i wasting money getting the iridium's?

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2011-03-08 22:31:30

Will

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I run the bkr7 for turbo, bkr6 for na, and they are always great, ive never noticed a difference with more expensive plugs

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White '92 NX2000 - JWT PP & B15 Disk, Hypercoil Gen2 damped by Koni Yellow Sports NX Thread

Black '95 200sx SE-R T28 Turbo Lowport 286whp/245wtq 12.306 @ 113.55 200sx Thread

Originally Posted by wnwright
I'm sorry I'm an engineer. I'm looking at the math.

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2011-03-08 23:27:33

chiquae07

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nissan moved the heat ranges from 6 to 5. if you dont start your car up move it 10 feet and shut it off often, you can use the 6s. that was primarily the reason why they switched from 6s to 5s. no difference otherwise. there was a posting about it on se-r.net awhile back, but i cant find it at the moment.

http://www.se-r.net/car_info/engine_performance_tuning.html#Spark plugs and Ignition systems

Originally Posted by se-r.net

Stock Nissan plugs have platinum in both the center and ground electrode for really long life. Most aftermarket platinum plugs only use platinum in the center electrode. I prefer for most engines, even the stock ones, to run the PFR6B-11 spark plug. This is the middle heat range for the NGK plugs. SR20 powered cars come with PFR5B-11 plugs, which are one heat range warmer. Originally when the SR20 was first introduced, the cars came with PFR6B-11s but they were fouling out during port storage where the cars are continuously being started, moved a few feet, and shut off. The countermeasure to high warranty on low mile sparkplugs was the switch to the hot plug.

The PFR6B-11 works well on high compression, turbocharged or NOS powered cars. For running extreme boost (more than 18 psi), a big shot of nos (more than 100 hp) or really high compression (more than 11:1) the cold PFR7B-11 plug is necessary. This plug will be on the edge of fouling during regular day to day driving so it can be considered a race only plug.

The SR20 has a shallow included angle of the combustion chamber. This makes for a quick burning, detonation-resistant chamber. I have also found that shallow included angle chambers for the most part do not like extended tip plugs. When experimenting with extended tip plugs I have found that the engine loses about 3-4 hp across the board. Many aftermarket plugs are extended tip. The theory behind extended tip plugs is that the extended tip puts the electrodes in a more turbulent section of the combustion chamber, thus helping them stay clean of fouling.

In the SR20 an extended tip plug puts the electrode too close to the piston dome screwing up flame propagation, thus losing power. This is important to consider if your are deviating from the Stock Nissan recommendation. Make sure that the tip of the plug that you are buying does not extend further than the stock plug’s tip. If you are running flat top or domed pistons, this is even more critical as the tip of the plug is even closer to the piston dome.

The SR20 has a powerful stock ignition that can fire through turbo boost and NOS. Gap the plugs at 0.045". If you experience misfire under squeeze or high boost (and the rest of the ignition system is in good condition, like the cap, rotor and wires) you can close the gap down to as small as 0.020" to prevent it. Go down in 0.005" increments until the misfire stops. Higher cylinder pressures cause by big NOS or high boost requires smaller gaps with the stock ignition. The smaller gap loses a little power but this trick can tide you over until you can get that snazzy turkey roaster ignition.

Last edited by chiquae07 on 2011-03-08 at 23-30-38.

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2011-03-08 23:50:23

lynchfourtwenty Online/offline status of lynchfourtwenty is unknown

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thats some good info, thanks

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2011-03-16 14:11:09

blackb13se-r Online/offline status of blackb13se-r is unknown

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i just checked at work. the b15 se now shows bkr5es-11's in the parts catalog. i could have sworn it showed 6's before. so i'm bout to try them out.

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2011-03-16 14:43:18

chiquae07

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between 5s and 6s, both run great in the b15.

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2008 Mazda 6 ATX 2.3

For those 10 seconds it takes to reach 60mph, i can safely text and go WOT.

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