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which spark plugs "6" or"7"s

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Old 29 December 2009, 01:15 PM
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steve nic
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Default which spark plugs "6" or"7"s

am i right in thinking 6's are standard ish @7's are for more tuned motors?
Old 29 December 2009, 01:29 PM
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yup
Old 29 December 2009, 01:43 PM
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so my car is slightly tuned(fmic,air filter,exhaust)will 6's be ok or best go for 7's?
Old 29 December 2009, 02:01 PM
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RA Dunk
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Hmm don't really know at which stage your supposed to swap sizes, I'm running around 400 or so and use the PFFR 7's
Old 29 December 2009, 02:01 PM
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Seeing as you have a FMIC, I assume you've had a remap and are running more boost/power than std.? (I think from 350+ bhp is considered 7s territory...)

Whatever, I'd use 7s - after all, they can only help in alleviating det, because they are a colder plug. The fact that you've started modifying means you'll invariably carry on, so fit the 7s. There's bugger all cost diff between 6s and 7s, so a no brainer...

Last edited by joz8968; 29 December 2009 at 02:08 PM.
Old 29 December 2009, 03:50 PM
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steve nic
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any idea where to get them from?
Old 29 December 2009, 03:56 PM
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eBay - brand new, boxed for a set of 4 should be no more than £30. I got mine for about £25 inc p&p.

Last edited by joz8968; 29 December 2009 at 04:08 PM.
Old 29 December 2009, 04:07 PM
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steve nic
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Originally Posted by joz8968
eBay - brand new, boxed for a set of 4 should be no more that £30. I got mine for about £25 inc p&p.
time for a look then
Old 29 December 2009, 04:12 PM
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£29.23 for a set of 4 delivered, from this seller:-

NGK spark plug PFR7B (plugs) PFR7-B trade price 4853 on eBay (end time 26-Jan-10 13:35:26 GMT)
Old 29 December 2009, 08:46 PM
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milliemoo
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Originally Posted by joz8968
Seeing as you have a FMIC, I assume you've had a remap and are running more boost/power than std.? (I think from 350+ bhp is considered 7s territory...)

Whatever, I'd use 7s - after all, they can only help in alleviating det, because they are a colder plug. The fact that you've started modifying means you'll invariably carry on, so fit the 7s. There's bugger all cost diff between 6s and 7s, so a no brainer...

i like the way you say invariably carry on modifying !!aint that the truth,the pringle sydrome imy missus calls it,once you pop you cant stop lol!!!
Old 29 December 2009, 09:09 PM
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Originally Posted by milliemoo
...my missus calls it,once you pop you cant stop lol!!!
You sure she's talking about modding Imprezas?
Old 29 December 2009, 09:19 PM
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im sure
,cant be anything else haha!!!
Old 30 December 2009, 02:55 AM
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Sc0oby
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jdm sti v8 came standard with "7" plugs
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