white01ss

iTrader: (37)

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

truckdoug

iTrader: (25)

i vote buttplugs

tblentrprz

The coldest plug that doesn't foul is the safest to run.

ddnspider

iTrader: (26)

Why not try an 8 and see how it runs?

Dren

Worthless without pics.

3 window

iTrader: (1)

Wrong forum

truckdoug

iTrader: (25)

dammit i always get this place confused with uncutlatinhunks.com

pdxmotorhead

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..

ls3fox

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

white01ss

iTrader: (37)

Would you mind putting a vote on that one?

are you talking about the screw on tip the ignition wire connects to? that's not good

white01ss

iTrader: (37)

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?

ls3fox

Yea this stupid thing

white01ss

iTrader: (37)

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.

blackdak318

iTrader: (3)

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.

white01ss

iTrader: (37)

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.

truckdoug

iTrader: (25)

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!

truckdoug

iTrader: (25)

also I change my vote to hairplugs

stevieturbo

Pick another few and you could run a different plug in every hole.

LilJayV10

iTrader: (39)

what do the plugs look like? how many threads are showing heat?

Kjduvall

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.