hybrid901

What is the best NGK plug for over 550whp? I was running a 9 heat range plug last year but forgot the part number.

ladysman

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hybrid901 &raquo;</TD></TR><TR><TD CLASS="quote">What is the best NGK plug for over 550whp? I was running a 9 heat range plug last year but forgot the part number.</TD></TR></TABLE>


See my thread and the second post under this thread. That should help.
https://honda-tech.com/zero...age=1


This also may help?

b18bturbo

i would use the rg5671-a number 8

DaX

iTrader: (1)

b18bturbo....would you recommend that also for someone going turbo but boosting lower numbers and making less horsepower, or will I be fine with stock NGK's?

//end thread hijack

hybrid901

Are the 8's cold enough or would I need 9's.

b18bturbo

for low hp the bcpr7es11 is most common plug

the 5671-a plugs are usually good for racing only not really used on street that often. mostly a race type plug. i used to run the 9s 10s and 11s

b18bturbo

i would start with a 8 and work your way down. but 8 should be plenty for your setup.

DaX

iTrader: (1)

Will any auto part store have them? Can I just take that part number [bcpr7es11] and get them?

Mase

Id run the 9's

b18bturbo

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaX &raquo;</TD></TR><TR><TD CLASS="quote">Will any auto part store have them? Can I just take that part number [bcpr7es11] and get them?</TD></TR></TABLE>

part number from NGK is 1095 ask for that at napa or any local parts store

Scott - 93HB Si

BKR7E's line up with 5672A's in that chart...why would you goto a 5671 (non-projected tip)???

92HB_HB

i'm assuming i would need the 8's then.. i'm curently running bcpr7es's and i am misfireing/stumbling badly up top at 75%-100% throttle, this was only at about 10 psi on my stock gsr.. they were gapped at .030 as well.. when i regapped them to about .020, my full throttle was smooth, but idle sucked real bad..

bump..

DIRep972

iTrader: (1)

you should not be having a problem w/ the 7's @ .030 on a stock GSR. There is something else wrong w/ ur set up then.

TurboTegB18c

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DIRep972 &raquo;</TD></TR><TR><TD CLASS="quote">you should not be having a problem w/ the 7's @ .030 on a stock GSR. There is something else wrong w/ ur set up then.
</TD></TR></TABLE>

On the real, i was running the 7's and made 450whp.

TurboTegB18c

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hybrid901 &raquo;</TD></TR><TR><TD CLASS="quote">What is the best NGK plug for over 550whp? I was running a 9 heat range plug last year but forgot the part number.</TD></TR></TABLE>

ngk R5671a-8 part# is 4554
ngk R5671a-9 part# is 5238

hybrid901

ngk R5671a-8 part# is 4554
ngk R5671a-9 part# is 5238

Those happen to be the 2 different plugs I ordered earlier, 8 of each.

ladysman

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hybrid901 &raquo;</TD></TR><TR><TD CLASS="quote">ngk R5671a-8 part# is 4554
ngk R5671a-9 part# is 5238

Those happen to be the 2 different plugs I ordered earlier, 8 of each.</TD></TR></TABLE>

Keep us posted cause I am curious. My thought was 9's but 8's might be OK.

Good luck.

gitwidit

R5671A-9 for anything over 500whp

DaX

iTrader: (1)

Higher or lower number with more horsepower?

ladysman

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaX &raquo;</TD></TR><TR><TD CLASS="quote">Higher or lower number with more horsepower?</TD></TR></TABLE>

Higher. The higher the number the colder the plug.

DaX

iTrader: (1)

so what cold range number are the bcpr7es11 / PN 1095?