NGK Spark Plugs.... - 3000GT/Stealth International Message Center

ramnakhle · 05-21-2008, 11:52 AM

Hey.
First time changing spark plugs
Went to a shop a few days ago and i got spark plugs for my 97 vr-4. I got NGK Platinums for 11$ apiece. Came back home and checked out the NGK website to make sure i got the right spec for the vr-4. NGK recommends PFR6J-11 for my car, and the guy at the store gave me PFR5J-11 plugs...

What is the difference, if any, and does anyone think i should go back and exchange them for 6's?

thanks

OhioSpyderman · 05-21-2008, 12:08 PM

I could be wrong, but I believe the "5's" are just one heat range colder (and a lot of guys who are modded here like to run colder plugs).

Lets wait to see if someone backs me up....but I really don't think they'd hurt anything....

Bob.

Import Power · 05-21-2008, 12:22 PM

Definitely wrong plugs. Take them back and get a set of Copper NGKs #5030

speedy25 · 05-21-2008, 04:22 PM

Quote:

Originally Posted by OhioSpyderman

I could be wrong, but I believe the "5's" are just one heat range colder

You got it backwards. The lower the number on NGK plugs the hotter it is.

I think everyone else does it the other way.

-SP

3KGT2NV · 05-21-2008, 04:25 PM

Quote:

Definitely wrong plugs. Take them back and get a set of Copper NGKs #5030

these are the plugs to get and they are only like $1.70 each at car quest

andyvr4 · 05-21-2008, 07:12 PM

Quote:

Originally Posted by 3KGT2NV

these are the plugs to get and they are only like $1.70 each at car quest

It depends on what you're looking for. If you're looking to run higher boost then the coppers gain you something, but you half to change them every 10-15k miles, whereas the plats will work perfectly fine in a stock or lightly modified VR4 and you don't half to change them nearly as often (likely at least 60-70k miles).

ramnakhle · 05-21-2008, 10:34 PM

Quote:

Originally Posted by andyvr4

It depends on what you're looking for. If you're looking to run higher boost then the coppers gain you something, but you half to change them every 10-15k miles, whereas the plats will work perfectly fine in a stock or lightly modified VR4 and you don't half to change them nearly as often (likely at least 60-70k miles).

I'm definitely running plats cos my car is stock and i'm not planning any major mods in the near future... I'm not getting coppers cos i don't want to change them that often, since i don't have a lot of time on my hands... my problem is whether the PFR5J-11s will work fine on my car...

ramnakhle · 05-21-2008, 10:54 PM

OK so i checked the litterature oni the NGK website...

the smaller the heat number the hotter the plug. One heat range unit is equivalent to dissipating about 70 degrees C worth of heat energy. This means that the clolder plugs can dissipate more heat guiding it away from the combustion chamber. So the PFR5J-11 is a hotter plug. Supposed to run colder plugs in modded cars wit hperformance gains.
They also say that running too hot a plug can cause pre-ignition and severe engine damage so here's my answer. I'm getting PFR6J-11s tomorrow!

Thought i'd clear this up. Anyways thanks guys

OhioSpyderman · 05-22-2008, 05:44 AM

Sorry for the misleading first post

Bob.

05-21-2008, 11:52 AM	#1 (permalink)
ramnakhle EVO Terminator Join Date: Jan 2008 Location: Beirut, Lebanon Drives: '97 3000GT VR-4 Trader Rating: (0)	NGK Spark Plugs.... Hey. First time changing spark plugs Went to a shop a few days ago and i got spark plugs for my 97 vr-4. I got NGK Platinums for 11$ apiece. Came back home and checked out the NGK website to make sure i got the right spec for the vr-4. NGK recommends PFR6J-11 for my car, and the guy at the store gave me PFR5J-11 plugs... What is the difference, if any, and does anyone think i should go back and exchange them for 6's? thanks __________________ Where's the 3K ????

05-21-2008, 12:22 PM	#3 (permalink)
Import Power Corn Its whats for boost Join Date: Jan 2002 Location: Behind the Wheel Drives: Vicki Insane Trader Rating: (210)	Re: NGK Spark Plugs.... Definitely wrong plugs. Take them back and get a set of Copper NGKs #5030 __________________ AEM Factory Trained Tuner 91VR4-3.0L-Stock heads and Cams-762AWHP 747AWTQ 30psi E100 Daily Driver 10.63@121mph SLTT-10.9 @ 140MPH Stock NA motor and NA heads/Cams T4 AWD 9.21 @ 154.98 T2 FWD 10.19 @ 140.31 T4-159.23 MPH Ran on 6G72 3.1L! T4-995AWHP Uncorrected 6G72 3.0L C16 T2-820FWHP 3.1L 27psi C16 91VR4 Red-17Gs w/supporting mods-sold 93SLTT/T2 91VR4 Pearl White-sold 91VR4 Black-sold 92VR4 Sandstone-sold 94VR4 Green-sold 93VR4 Pearl White-sold NG09 Title Sponsor 3SX Performance 3SX Performance Service Email

05-21-2008, 10:54 PM	#8 (permalink)
ramnakhle EVO Terminator Join Date: Jan 2008 Location: Beirut, Lebanon Drives: '97 3000GT VR-4 Trader Rating: (0)	Re: NGK Spark Plugs.... OK so i checked the litterature oni the NGK website... the smaller the heat number the hotter the plug. One heat range unit is equivalent to dissipating about 70 degrees C worth of heat energy. This means that the clolder plugs can dissipate more heat guiding it away from the combustion chamber. So the PFR5J-11 is a hotter plug. Supposed to run colder plugs in modded cars wit hperformance gains. They also say that running too hot a plug can cause pre-ignition and severe engine damage so here's my answer. I'm getting PFR6J-11s tomorrow! Thought i'd clear this up. Anyways thanks guys

05-22-2008, 05:44 AM	#9 (permalink)
OhioSpyderman Former ROTY :-} Join Date: Oct 2000 Location: Dayton, Ohio Drives: Back and Forth :) Trader Rating: (45)	Re: NGK Spark Plugs.... Sorry for the misleading first post Bob.

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