NGK-R
08-04-2008, 08:17 AM
#2
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Join Date: Apr 2008
Posts: 96
08-04-2008, 11:30 AM
#3
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Join Date: May 2002
Location: California
Posts: 22,465
part number depends on which plug you want, they have different heat ranges. 10, 10.5 and 11, they used to have 13 too.
NGK 6725-10, NGK 6725-10.5, NGK 6725-115
i think summit and places like that stock it by the other number
NGK 6725-10, NGK 6725-10.5, NGK 6725-115
i think summit and places like that stock it by the other number
08-04-2008, 12:22 PM
#4
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Join Date: May 2002
Location: California
Posts: 22,465
08-04-2008, 02:25 PM
#6
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Join Date: Dec 2002
Location: Oblivion
Posts: 686
Originally Posted by j9fd3s' post='905829' date='Aug 4 2008, 01:44 PM
anyone find em cheaper than 33.82?
http://www.rx7.com/store/rx7/fcignition.html
$28.95
08-04-2008, 11:50 PM
#9
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Thread Starter
Join Date: Feb 2005
Location: Kissimmee FL.
Posts: 1,579
well, after some research i decided against them. i seen people gain 9-10 whp from stock NGK's to the R's. but they tend to foul out quickly for daily driving and have trouble with hot starts.
atleast i read that a few places...
atleast i read that a few places...
08-05-2008, 12:10 AM
#10
Senior Member
Join Date: Feb 2003
Location: Calgary
Posts: 564
They will outlast stock plugs by a factor of 3 even with an ignition amp. You can index them to spark towards the approaching charge, they do make more hp than stock plugs, a little more safe advance can be had, I tested it on my own dyno. As for fouling on street cars, never had it happen, and I run 10.5's on my n/a p-port, 11.5's on my TII. Getting rid of the junk aftermarket apex seals, got rid of my hot start problems..
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