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
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
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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TECH Addict
Joined: Oct 2016
Posts: 2,513
Likes: 480
From: PDX-OR-USA
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..
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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7 Second Club
Joined: Apr 2015
Posts: 692
Likes: 149
i run the r5671a-8 in my car it’s the best plug I’ve 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 won’t those again
are you talking about the screw on tip the ignition wire connects to? that's not good
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..
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..
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.
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.
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!
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!
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
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
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.
TECH Enthusiast
Joined: Jul 2018
Posts: 635
Likes: 329
From: Missouri
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.