Every spark plug question Answered
 

Heres all the information from Graham @ NX and Brandon with NGK..

NGK aside from being the plugs I use personally are the OEM distributor for plugs on these cars.

Supercharged cars First

SC - The factory plug on 04-05 redlines and 05 cobaltss cars is the PFR6T-10G. They changed that to a IFR6V-10G which is the same plug but a iridium platinum plug.

They now have the BKR series which are a V-power plug which is what is recommended for stock and modded applications. For a stock car the plug would be a BKR6E which is simply a v-power plug at a 6 heat range which is stock. This would be the plug for stock or non-pullied non nitrous setups bolt on application setups. Now if you do increase psi or use small nitrous shots you will want to take a step colder plug and use a BKR7E. Now if you have increased the boost and are wanting to spray a decent size hit you can to a 8 heat range plug BKR8E. Now on any of these plugs if you would like to go iridium vs the nickle you can add the prefix EIX. These are a more expensive plug but will last longer and have a little more performance. The BKR8EIX should have no idle issue that you sometimes have with colder plugs. When you get to the 9 heat range the BKR9EIX ( only have these in Iridium ) Their might be some idle issue's that need to be addressed in the tune. I would recommend plug gaps at .45-.40 for near stock applications, .40 for increased boost, and .35-.30 for nitrous users.

Cliff notes -

Stock/mild mods - BKR6E
Mild mods/Pulley and small nitrous - BKR7E
Mods/pulley and large nitrous - BKR8EIX
Mods/ Very small pulley or very large nitrous shot - BKR9EIX ( only have these in Iridium )

TC -

The OEM plug is a ILTR5D. This is a 5 heat range plug. This came from the factory with a stage hotter than supercharged cars. This is also a iridium platinum plug. If you would like to increase psi or use nitrous you can go to a LTR6AIX-11. This is a 6 heat range plug that also has a tapered cut ground and is a more performance oriented plug. This plug comes gapped at .44 so if you run these plugs re gap them at .35 for turbo only or .30 for use with nitrous. If you are going to run a larger nitrous hit then you can a step colder with LTR7AIX-11. This is a 7 heat range plug with the same changes as its 6 heat range equivalent and will need to be re-gapped accordingly.

Cliff notes -

Stock/mild mods - ILTR5D
Mild mods/psi increase with small nitrous - LTR6IX-11 gapped at .40/.32 with nitrous
Mods/More psi or Large nitrous hit - LTR7IX-11 gapped at .40/.32 with nitrous

Great write up bro for the unknolegeable. great 10 thumbs up lol out of 10 100%

well written :twothumbs

so ur sayin since im on the 2.5 pulley on the TVS and plan on runnin a 50 shot with 25psi i should have the BKR9EIX? :lol:

good write up man. thanks for the info

Thanks sir. Hope this gets the ball rolling on some good tech.
I would run the 8. I would think that would have it covered. ;)

Thats what were here for.

Nice write up!!!!! now you just need to put in the spark plug gaps to cover the other question that gets asked a million times

Agreed. I added some too it and revised a little that i had already written.

Graham nice post! The only thing needed to change is that when you get to the '8' heat range for supercharged cars the part number will actually be NGK BKR8EIX instead of
BKR8E (which we don't make). The coldest nickel plug is the BKR7E and after that we make BKR8EIX and BKR9EIX

also for the turbo engine the colder plug numbers are LTR6IX-11 and LTR7IX-11

Other than that it all looks good. :cool:

Oh and BTW it's Brandon, not Brad ;)

So, is it LTR6AIX-11 or LTR6IX-11? I can't find LTR6AIX-11 anywhere.

Thanks for the help man! thats awesome my first name is brandon. Football player and so always been Graham.

Btw guys NGK has the best customer support of any company I have ever dealt with. Brandon (NGKTECH) actually had a bolt on redline and help me with all this information. Cant ask for better than that. Who comes to the forum to proof read for their company? Brandon @ NGK

It should be LTR6IX-11 stock# 6509 (one step colder) and LTR7IX-11 stock# 6510 (two steps colder), sorry for the confusion.

http://ngk.com/results_cross.asp?pid=ltr6ix-11

http://ngk.com/results_cross.asp?pid=ltr7ix-11

Thanks for double checking. Lots of part numbers over the phone.

My fault. I think I accidently threw the 'A' in there when I gave you the part numbers over the phone.

Also, here is a link to the Redline Forums on spark plugs that some may find helpful, my SN on that ste is saturnterminator

http://www.******************/forums...erences-8.html

Since you're here, I figured i'd ask. What do you offer that would work in place of a BKR8E? I was running some plugs that were spec'd for a supra I believe, I could get 8's, 9's, all the way to 11's, in a copper plug. Since I was changing them out ever oil change anyway, I didn't see the point of throwing away iridiums. I'm also not a big fan of the super-small electrode when using nitrous.

Awesome Information!

This thread should be a sticky!

Agreed. If for no other reason than that this question is asked at least once a day, every day, and has been for 4 years.

Ill see what the moderator thinks about Stickying the OP and leaving this thread open for discussion. That work for you guys?

That would be awesome!

Nice write up. What do you consider a large shot?

Like plugs for a 2.8/75 shot?

also curious on this..

i planned on runnin a 50 to 75 shot on my tvs thats pushin in the neighborhood of 25 psi.. the iridiums the best for this?

Thats great thanks for you time to write this.
I do have one question... Does running E85 have any effect to what step colder plug to use? Or the basics stay the same.

Thanks,

Hi Joe,

NGK sells a couple V-power race plug series that are available in heat ranges from 8 through 11 for the LSJ supercharged engines only

The only potential problem with these plugs (and the reason we usually don't recommend them) is that they are a non-resistor spark plug and on some fuel injected applications could cause electromagnetic interference (EMI) with the cars onboard computers, especially while tuning the problems seem to be most prevalent such as no connectivity to the laptop when using HP tuners or random misfires. The non-resistor plug can even cause radio frequency interference (RFI) where you may get static on the radio, this is usually worst on AM stations.

As long as you know this upfront and know what the symptoms are then you could give them a try to see if they work. The part numbers are as follows:

Non projected tip (better for nitrous use or high boost (30psi or so))
R5671A-8
R5671A-9
R5671A-10
R5671A-11

Projected tip (no nitrous just boost)
R5672A-8
R5672A-9
R5672A-10

As you can see there are many different plug options and differences in setups that people will run so if you have any questions at all just give a call to NGK's tech line at 248-926-6315 and I can help you select the right plug for your application.

This Thread=Win

Good response guys. Thanks for all the good words.

Any time you guys have plug questions Brandon is the guy to talk with. I know who im calling when i need them.

How do these differ from the 3787 *Laser Long Life* (Pre gapped at .032)?. Looks like these are PLATINUM TIPPED. Any advantage to that?

3787:
http://ngk.com/results_cross.asp?pid=3787&x=26&y=16

6509 (LTR6IX-11) (Pre Gapped .043):

http://ngk.com/results_cross.asp?pid=6509&x=63&y=15