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View Poll Results: Plugs for 800 rwhp ProCharger
NGK BR7EF / 3346 - Heat 7, Resistor, Tapered, V-groove
6
60.00%
NGK BR7EFS / 1094 - Heat 7, Resistor, Tapered
1
10.00%
NGK R5671A-7 / 4091 - Heat 7, Non-Resistor, Gasket, V-groove
1
10.00%
NGK B8EFS / 1049 - Heat 8, Non-Resistor, Tapered
0
0%
NGK R5671A-8 / 4554 - Heat 8, Non-Resistor, Gasket, V-groove
2
20.00%
Voters: 10. You may not vote on this poll

Help me pick my next set of plugs

 
Old 05-19-2019, 02:17 PM
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Default Help me pick my next set of plugs

Currently running the same BR7EF plugs I've been running in the car for the last five years. Haven't had any real issues with them at 700 rwhp, but now that the car is around 800 I thought about going up a range. Car is 93 with 70/30 meth/water. Seems like it's kind of on the edge of needing the 8s to keep things on the safe side. Opinions?

7 Range - Non-projected

NGK BR7EF / 3346 - Resistor, Tapered, V-groove
NGK BR7EFS / 1094 - Resistor, Tapered
NGK R5671A-7 / 4091 - Race, Non-Resistor, Gasket, V-groove

8 Range - Non-projected

NGK B8EFS / 1049 - Non-Resistor, Tapered
NGK R5671A-8 / 4554 - Race, Non-Resistor, Gasket, V-groove
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Old 05-19-2019, 03:07 PM
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i vote buttplugs
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Old 05-19-2019, 04:28 PM
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The coldest plug that doesn't foul is the safest to run.
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Old 05-19-2019, 07:27 PM
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Why not try an 8 and see how it runs?
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Old 05-19-2019, 07:30 PM
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Worthless without pics.

Originally Posted by truckdoug View Post
i vote buttplugs
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Old 05-19-2019, 07:49 PM
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Originally Posted by truckdoug View Post
i vote buttplugs
Wrong forum
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Old 05-19-2019, 09:45 PM
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Originally Posted by 3 window View Post
Wrong forum
dammit i always get this place confused with uncutlatinhunks.com
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Old 05-19-2019, 10:16 PM
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That is the same plug that I used to use in a 250 dirtbike, they take a lot of heat.. Unless your getting signs of misfire ,,
Seems like your looking for a problem where you may not need to worry.. I don't run non resistor plugs in anything unless its fairly exotic and track only.. Sure fire way to blow up ignition and ECU parts..
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Old 05-19-2019, 10:24 PM
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i run the r5671a-8 in my car itís the best plug Iíve used and I tried the br7ef and the b8efs the 7 I thought was a touch hot and the b8efs has removable tips and I had a few loosen up and one few off completely so I wonít those again
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Old 05-20-2019, 09:01 AM
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Originally Posted by ls3fox View Post
i run the r5671a-8 in my car itís the best plug Iíve used and I tried the br7ef and the b8efs the 7 I thought was a touch hot
Would you mind putting a vote on that one?

Originally Posted by ls3fox View Post
the b8efs has removable tips and I had a few loosen up and one few off completely so I wonít those again
are you talking about the screw on tip the ignition wire connects to? that's not good
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Old 05-20-2019, 09:09 AM
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Originally Posted by pdxmotorhead View Post
That is the same plug that I used to use in a 250 dirtbike, they take a lot of heat.. Unless your getting signs of misfire ,,
Seems like your looking for a problem where you may not need to worry.. I don't run non resistor plugs in anything unless its fairly exotic and track only.. Sure fire way to blow up ignition and ECU parts..
Yeah, I'm not too keen on chasing electrical gremlins either. The car doesn't have radio so that won't be an issue and has stock ECU. Anyone have ECU issues from using non resistor plugs? If so, what kind?
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Old 05-20-2019, 09:17 AM
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Originally Posted by white01ss View Post
are you talking about the screw on tip the ignition wire connects to? that's not good
Yea this stupid thing
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Old 05-21-2019, 01:45 PM
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Originally Posted by ddnspider View Post
Why not try an 8 and see how it runs?
That's exactly what I'm going to do. I'm pretty lazy about changing plugs, though so I don't want have any issues. I've had the last set of trusty BR7EFs in there for 2 years. If I used some plug wires with a bit of resistance that should provide enough EMI protection when using the 8 non-resistor plugs. I'm ordering some R5671A-8 right now.
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Old 05-22-2019, 09:54 AM
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I made 850 rwhp thru an unlocked 4L80e on the BR7EF on E85, zero issues. IMO that plug is still good for your set up even after the changes.
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Old 05-22-2019, 12:38 PM
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Originally Posted by blackdak318 View Post
I made 850 rwhp thru an unlocked 4L80e on the BR7EF on E85, zero issues. IMO that plug is still good for your set up even after the changes.
Thanks for feedback! In a few days I will have all the plugs: BR7EF, B8EFS, and R5671A-8. Also ordered a set of Magnacor wires as they are supposed to have 2k ohms of resistance. I'm assuming 93/meth is as safe to run as E85 which is probably why I haven't had any issues with the 7s.

What scares me is the "rule of thumb" many articles talk about that you need 1 heat range colder than stock for every additional 100 hp. Applying that rule to a stock 300 rwhp LS1 using plugs like TR55 heat range 5, then adding 500 rwhp to it would mean going up to a heat range of 10!

I know all this is theoretical, because the real answer is found by reading the plugs by cutting them open. Heck, Steve Morris has a nice video where he talks about tuning using only the plugs. He talks about how the plugs can tell you how much timing, fueling, and heat range the engine needs. He's a professional engine builder, I'm not. And I'm way to lazy to ever get close to that level of tuning. I just looking for a plug I can run without fouling out on the street, but safe enough for some 1/4 mile and spirited highway runs.
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Old 05-22-2019, 04:29 PM
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I made 1075 wheel on some 7's

but by all means try some 8's and see if you can get some more out of your combo

if I though I was limited by plug heat range I would do it in a second....its like the easiest thing on the whole car to change!
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Old 05-22-2019, 04:34 PM
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also I change my vote to hairplugs
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Old 05-24-2019, 04:09 PM
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Originally Posted by white01ss View Post
Currently running the same BR7EF plugs I've been running in the car for the last five years. Haven't had any real issues with them at 700 rwhp, but now that the car is around 800 I thought about going up a range. Car is 93 with 70/30 meth/water. Seems like it's kind of on the edge of needing the 8s to keep things on the safe side. Opinions?

7 Range - Non-projected

NGK BR7EF / 3346 - Resistor, Tapered, V-groove
NGK BR7EFS / 1094 - Resistor, Tapered
NGK R5671A-7 / 4091 - Race, Non-Resistor, Gasket, V-groove

8 Range - Non-projected

NGK B8EFS / 1049 - Non-Resistor, Tapered
NGK R5671A-8 / 4554 - Race, Non-Resistor, Gasket, V-groove

Pick another few and you could run a different plug in every hole.
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Old 05-25-2019, 04:03 PM
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what do the plugs look like? how many threads are showing heat?
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Old 05-25-2019, 07:06 PM
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Haven't herd any thing in this thread about plug gap . My 550+ pro charged ly2 4.8 started pinging. With .036 gap. Just tightened down my br7ef to .029. solved all my high rpm stumble. No problems here.
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