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Old Aug 16, 2011 | 06:58 PM
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Default Please read my Plugs

Take a look at these plugs and see what you think. I just wanted to check after upgrading to 6an line and 4an to solenoid. Wanting to make this a little conservative for now, soon will be changing plates.
My wideband says 12.5-12.8 on NA. On nitrous it goes to 10.8-11.2.


Br7's, 93 octane, with 116 in the stand alone at 58-60psi.

Plug on the left was 14 degrees 73/40 jets.

Plug on the right was 73/38 jets, was suppose to be 14 degrees, but looking at the log it was actually 15 for most of the run, then dropped to 14 at the very end.

I can clearly see the timing mark on the left plug. Still needs less timing right?
I can hardly see any color on the white porcelain?
Attached Thumbnails Please read my Plugs-imag0593.jpg   Please read my Plugs-imag0594.jpg   Please read my Plugs-imag0596.jpg  
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Old Aug 16, 2011 | 07:08 PM
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Left looks BL lean...
Right looks lean and hot,+ too much timing.

Best I can tell on laptop....and where they discolored before install ? (blue/purple at threads ?)
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Old Aug 16, 2011 | 07:20 PM
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Originally Posted by Doug G
Left looks BL lean...
Right looks lean and hot,+ too much timing.

Best I can tell on laptop....and where they discolored before install ? (blue/purple at threads ?)
They were both new silver before making the pass. You can see just a hint more black on the left plug, which had the bigger 40 fuel jet.

I was thinking the rainbow color indicated heat too. Would going to br8's help this? Or is it a result from the fuel mixture?
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Old Aug 17, 2011 | 04:45 AM
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Most plugs are lower number = colder. You'll have to look that up for that plug (and I'd say 2 steps coolder to start)

And the good thing.... no black/shiney specs.
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Old Aug 17, 2011 | 08:45 AM
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Originally Posted by Doug G
Most plugs are lower number = colder. You'll have to look that up for that plug (and I'd say 2 steps coolder to start)

And the good thing.... no black/shiney specs.
Not for NGK plugs. br6ef-br7ef-b8efs= as the number goes up it gets colder.

NGK tr55 is the stock plug. br6ef is non-projected and a little bit colder. br7ef is good to around 175-200 shot and any more than that you go up accordingly.
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Old Aug 17, 2011 | 12:51 PM
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the plugs to hot. go at least 1 colder. timming looks close depending on how long that run was compared to a full run. the plug being to hot makes it look leaner than it is. so id leave the fuel alone change the plugs and get another look. you need a good 4-5 second pull minimum.
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Old Aug 17, 2011 | 03:21 PM
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Originally Posted by ShiznityZ28
the plugs to hot. go at least 1 colder. timming looks close depending on how long that run was compared to a full run. the plug being to hot makes it look leaner than it is. so id leave the fuel alone change the plugs and get another look. you need a good 4-5 second pull minimum.
ding ding ding. Exactly what I was gonna type. Go to one step colder, and start at 72/38 at 14 degrees and go from there.
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Old Aug 17, 2011 | 05:56 PM
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Originally Posted by 87silverbullet
Not for NGK plugs. br6ef-br7ef-b8efs= as the number goes up it gets colder.

NGK tr55 is the stock plug. br6ef is non-projected and a little bit colder. br7ef is good to around 175-200 shot and any more than that you go up accordingly.
Thats why I said to look it up....
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Old Aug 17, 2011 | 06:43 PM
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Thanks guys. I have some B8Efs on the way. Going to give them a try.

I've been reading a lot about plugs. On article said- If the plug is too hot, the heat will actually clean away the fuel ring. Might be whats happening on these Br7's
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