higher boost plugs and bp7efs crosses to...
I use 7317s (tapered seat, R5724-8), I have had some missfire issues with the retracted gaps. NGK racing plugs all start with R, R is for racing. If there is an R in a non-racing NGK plug then its a resistor. If you put non resistor plugs in and it missfires take them out and put resistor plugs in - pretty simple 
If your a/f is close to 13:1-14:1 at idle you wont foul the 8s, I even run 9s sometimes and have never fouled a plug.
If your a/f is close to 13:1-14:1 at idle you wont foul the 8s, I even run 9s sometimes and have never fouled a plug.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
I emailed NGK out of curiosity....telling them of my spec etc...
This is their reply.
but damn these BKR8EIX's are expensive. ( as I pictured )
This is their reply.
Thank you for contacting NGK Spark plugs (USA).
If the heads require the tapered seat plug (as they do in the US) I
would suggest the TR7IX or the one heat range cooler TR8IX, to be sure
you have the proper chamber projection and seal.
Otherwise I would have you try the BKR7EIX (same heat range as you have
now) or the colder BKR8EIX. These iridium plugs should help increase
performance slightly due to the tapered cut ground electrode. Hope this
helps, thank you.
If the heads require the tapered seat plug (as they do in the US) I
would suggest the TR7IX or the one heat range cooler TR8IX, to be sure
you have the proper chamber projection and seal.
Otherwise I would have you try the BKR7EIX (same heat range as you have
now) or the colder BKR8EIX. These iridium plugs should help increase
performance slightly due to the tapered cut ground electrode. Hope this
helps, thank you.
Originally Posted by stevieturbo
but damn these BKR8EIX's are expensive.
$6.99ea @ O'Reilly in US...
who all runs platinum or iridium plugs w/ forced induction?
I was under the impression that very few do...if so...why?
kp's 7317 (which also crosses to nicD's AR94):
http://www.ngk.com/results_cross.asp?pid=7317
mightymouse's 7173:
http://www.ngk.com/results_cross.asp?pid=7173
NGK (4554 / R5671A-8) - cross to Hunter's AR3934:
http://www.ngk.com/results_cross.asp...CrossWarning=1
NGK BP7EFS:
http://www.ngk.com/results_cross.asp?pid=bp7efs
NGK BCPR7EY-11:
http://www.ngk.com/results_cross.asp?pid=BCPR7EY-11
NGK BKR8EIX
http://www.ngk.com/results_cross.asp?pid=BKR8EIX
stevieturbo's PFR7B:
http://www.ngk.com/results_cross.asp?pid=pfr7b
http://www.ngk.com/results_cross.asp?pid=7317
mightymouse's 7173:
http://www.ngk.com/results_cross.asp?pid=7173
NGK (4554 / R5671A-8) - cross to Hunter's AR3934:
http://www.ngk.com/results_cross.asp...CrossWarning=1
NGK BP7EFS:
http://www.ngk.com/results_cross.asp?pid=bp7efs
NGK BCPR7EY-11:
http://www.ngk.com/results_cross.asp?pid=BCPR7EY-11
NGK BKR8EIX
http://www.ngk.com/results_cross.asp?pid=BKR8EIX
stevieturbo's PFR7B:
http://www.ngk.com/results_cross.asp?pid=pfr7b
Last edited by Superado; Nov 19, 2007 at 04:31 PM.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
Ive been using NGK Double platinums for about 2 years now, with no problems. I have melted some recently, but thats down to tuning, not the plugs. But it also has me wondering would a cooler plug, be worth a shot.
These are the PFR7B, less the electrode lol. OOPS !!!!
Im guessing any heat range change wont make a difference to this happening ? lol. Surprisingly, the car still ran fine like this....well, aside from the lost compression due to ring damage.
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Verdad Gallardo kp's 7317 (which also crosses to nicD's AR94):
http://www.ngk.com/results_cross.asp?pid=7317
mightymouse's 7173:
http://www.ngk.com/results_cross.asp?pid=7173
NGK (4554 / R5671A-8) - cross to Hunter's AR3934:
http://www.ngk.com/results_cross.asp...CrossWarning=1
NGK BP7EFS:
http://www.ngk.com/results_cross.asp?pid=bp7efs
NGK BCPR7EY-11:
http://www.ngk.com/results_cross.asp?pid=BCPR7EY-11
NGK BKR8EIX
http://www.ngk.com/results_cross.asp?pid=BKR8EIX
http://www.ngk.com/results_cross.asp?pid=7317
mightymouse's 7173:
http://www.ngk.com/results_cross.asp?pid=7173
NGK (4554 / R5671A-8) - cross to Hunter's AR3934:
http://www.ngk.com/results_cross.asp...CrossWarning=1
NGK BP7EFS:
http://www.ngk.com/results_cross.asp?pid=bp7efs
NGK BCPR7EY-11:
http://www.ngk.com/results_cross.asp?pid=BCPR7EY-11
NGK BKR8EIX
http://www.ngk.com/results_cross.asp?pid=BKR8EIX
I normally use the NGK's,but the Autolite's are a normal stocking item for Advanced Auto.
Hunter...the NGK's are now regular stocking at the Hiram O'Reilly...you can request the same thing in Kennesaw...one of our delivery driver's Husband is the Mgr. there...and they're cheap too...
Cool, Thank's. My only concern after looking at the link's you posted of the different plug's is my plug's electrode's are recessed and MM,KP's are protruding,but both set's are heat range 8, I believe. I think the range 8 with the prtruding tip would be better? Not sure though.
