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Every spark plug question Answered

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Every spark plug question Answered

Old 08-13-2010, 11:41 AM
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Originally Posted by ronn View Post
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
The 3787 has both an iridium center electrode and platinum tipped ground electrode so it has longer service life. Usually 100k mile life where the ltr6ix-11 has a life of around 50k miles
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Old 08-13-2010, 03:51 PM
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Originally Posted by NGKTECH View Post
The 3787 has both an iridium center electrode and platinum tipped ground electrode so it has longer service life. Usually 100k mile life where the ltr6ix-11 has a life of around 50k miles

Thanks. Do you know if the STOCK AC Delcos have plat tip as well? The manual calls for long service life too.
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Old 08-16-2010, 11:48 AM
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Originally Posted by ronn View Post
Thanks. Do you know if the STOCK AC Delcos have plat tip as well? The manual calls for long service life too.

NGK was actually the OE supplier to AC Delco for the turbo engines, so yes they have platinum tipped ground electrodes and iridium center electrodes.
(factory part is NGK ILFR5D)
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Old 08-16-2010, 11:56 AM
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Old 08-16-2010, 03:33 PM
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So what is considered a "Large shot" ?.....
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Old 08-16-2010, 04:10 PM
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Originally Posted by StreetLC View Post
So what is considered a "Large shot" ?.....
It's always safer to pick a heat range that's too cold rather than too hott so I would say a 75 shot or more should be considered large if you already have a smaller pulley or higher boost levels than stock
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Old 08-17-2010, 12:22 PM
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Originally Posted by NGKTECH View Post
It's always safer to pick a heat range that's too cold rather than too hott so I would say a 75 shot or more should be considered large if you already have a smaller pulley or higher boost levels than stock
I agree. This is where I would draw the line as well.
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Old 08-17-2010, 12:29 PM
  #33  
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Originally Posted by Nitrousexpress View Post
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
Thank you for posting that. You don't know how many times I got into arguments on here with "know it alls" claming I was wrong about my stock plugs in my 07' being IFR6V-10G (laser iridiums).

Great write up
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Old 08-17-2010, 12:31 PM
  #34  
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Me and brandon spent a little time on it. Im glad it came out so well and then its useful.
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Old 08-23-2010, 12:53 AM
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Dude, thanks man I've been meaning to ask you which plugs to go with as well as the gap if we tune for nitrous.
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Old 08-23-2010, 01:21 AM
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Old 08-23-2010, 01:46 AM
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Question: For an E85 application, what do you recommend? I am running a bkr7e at a .30 gap. At .35 there is blowout/misfires up top. Curious to see your thoughts (NitrousExpress, not the average member). Reason being, a debate between myself (self taught cobalt tuner) and my friend (high performance applications training at Northern Ohio University)
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Old 08-23-2010, 10:34 AM
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Because E-85 is harder to ignite than gasoline you'll typically need to lower the gap
.005'-.010" lower than you would with gas. Most E-85 boosted setups will run between .022" and .030" depending on boost levels and other modifications.

Heat range will usually stay the same between E-85 and gas although sometimes if enough extra timing is added, then a colder heat range may be needed.

About every 10 degrees of ignition advance added increases plug tip temps about 70-100* C which also happens to be the difference of one heat range increment with NGK plugs.

Last edited by NGKTECH; 09-07-2010 at 09:36 AM.
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Old 08-23-2010, 11:38 AM
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Thank you. My friend with the high performance applications degree was telling me I needed to widen the gap and run stock heat range... I thought along the same thought process as your post. 24*timing is fun as hell! Thanks for the reply. I'll go with a BKR8E next I change plugs and give it a shot.
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Old 08-23-2010, 11:51 AM
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Thanks for all the help in here brandon. Helps me a lot. Plus your expertise is exceptional and beyond my own when it gets down to some real hardcore tech on the plugs.
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Old 08-23-2010, 12:45 PM
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Originally Posted by WickedSS2005 View Post
Thank you. I'll go with a BKR8E next I change plugs and give it a shot.
Unfortunately when you go to the '8' heat range and you want to stay with a V-power the part number changes from the 'BKR' series to the R5672A-8 stock# 7173 (V-power). Or the iridium IX version is BKR8EIX stock# 2668 Hope this helps, thank you.
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Old 08-23-2010, 02:44 PM
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Thanks for that, I'll be staying away from iridium. Not a fan
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Old 09-07-2010, 05:53 AM
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Found this thread while doing a search.

It is now a sticky.
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Old 09-07-2010, 11:55 AM
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Originally Posted by Black SS/SC 06 View Post
Found this thread while doing a search.

It is now a sticky.
Wait, you searched?! No way!
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Old 09-07-2010, 04:40 PM
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No one ever sent me a message to make it a sticky
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Old 09-07-2010, 05:04 PM
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ran bkr7e's from stage 2 up to 380whp. from 14psi to 29psi. ngk does make plugs that are not iridiums that will work in your cars up to heat range 10
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Old 09-14-2010, 04:51 PM
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Originally Posted by Area47 View Post
ran bkr7e's from stage 2 up to 380whp. from 14psi to 29psi. ngk does make plugs that are not iridiums that will work in your cars up to heat range 10
Actually we have plugs up to heat range 11 in this series

But the only issue is that these plugs are non-ressitor plugs that come with the possibility of causing electromagnetic interference with the computers and all kinds of weird issues. However this isn't always the case as I have a friend with a Cobalt SS running the
R5671A-9 without issue.
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Old 09-14-2010, 05:41 PM
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most users don't know how to read a plug, so most assume they need colder plugs when they really don't.
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Old 10-02-2010, 11:47 PM
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Originally Posted by NGKTECH View Post
NGK was actually the OE supplier to AC Delco for the turbo engines, so yes they have platinum tipped ground electrodes and iridium center electrodes.
(factory part is NGK ILFR5D)

Would this be the same as AC Delco 41-105 iridium one heat range cooler? Stock is 41-108.
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Old 10-06-2010, 01:58 PM
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Originally Posted by blrt View Post
Would this be the same as AC Delco 41-105 iridium one heat range cooler? Stock is 41-108.
According to our cross, the 41-105 and 108 are both equivalent to the ILTR5C-11 The next colder heat range is LTR6IX-11


COMPETITOR NGK NGK STK NO.
41-105 ILTR5C11 5581
41-108 ILTR5C11 5581
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