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check out this plug...

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Old 04-21-2012, 10:01 PM   #1
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Default check out this plug...

this plug installed in staging lanes. 1/4 pass. shut down and removed on return road.

Total Spark (via log): 9.0 deg
Wideband: Showing 9.7-10.3X AFR
gap: 0.030"
plug: B8EFS

I get the idea more spark/less fuel needed. comments?

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old setup: 9s/145
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Old 04-21-2012, 11:48 PM   #2
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way way way way rich and no timing
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Old 04-22-2012, 12:09 AM   #3
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Quote:
Originally Posted by camscam02 View Post
way way way way rich and no timing
when you gonna help me tweak this thing?
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old setup: 9s/145
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Old 04-22-2012, 12:24 AM   #4
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Pull fuel leave spark alone till fuel is corrected. Then look for heat on strap, I wouldn't chase a timing mark though.
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Old 04-22-2012, 12:27 AM   #5
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Quote:
Originally Posted by 03EBZ06 View Post
when you gonna help me tweak this thing?
One day, I don't even have enough time to mess with my car now a days. too dang busy. what jetting is in it? I believe when I was at ffp there was something like a .05x fuel jet in it?

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Originally Posted by Fbodyjunkie06 View Post
Pull fuel leave spark alone till fuel is corrected. Then look for heat on strap, I wouldn't chase a timing mark though.
exactly correct
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Old 04-22-2012, 12:30 AM   #6
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Quote:
Originally Posted by camscam02 View Post
one day, i don't even have enough time to mess with my car now a days. Too dang busy. What jetting is in it? I believe when i was at ftp there was something like a .05x fuel jet in it?



Exactly correct
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Old 04-22-2012, 12:43 AM   #7
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Quote:
Originally Posted by camscam02 View Post
One day, I don't even have enough time to mess with my car now a days. too dang busy. what jetting is in it? I believe when I was at ffp there was something like a .05x fuel jet in it?
exactly correct
The plug above is an 82/46. The dedicated fuel regulator set at 54psi.
It has ran best times/et/mph w/the 78/44 combo, that resulting in around 11.4:1 AFR.

My wideband was showing excessively rich AFRs and I didn't believe it, but i guess its right.
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Old 04-22-2012, 12:50 AM   #8
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Either reduce fuel pressure slowly or pull fuel jet or if you are comfortable with more power and your chassis tune can handle it add more nitrous jet.

I would for sure get it leaned out a point and a half at least, running rich with nitrous is waaay worse than running lean.
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Old 04-22-2012, 01:17 AM   #9
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Quote:
Originally Posted by Fbodyjunkie06 View Post
Either reduce fuel pressure slowly or pull fuel jet or if you are comfortable with more power and your chassis tune can handle it add more nitrous jet.

I would for sure get it leaned out a point and a half at least, running rich with nitrous is waaay worse than running lean.
I also subscribe to the leaner, less spark theory. I won't even touch the spark till the AFR gets more in line. I calculate a 1 psi drop in fuel pressure is approximately a 1% reduction fuel flow, so I will probably drop fuel pressure 2psi and see how much it changes, then extrapolate carefully.
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old setup: 9s/145
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Old 04-22-2012, 07:56 AM   #10
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Your fuel ring needs to be about half of what you are showing, especially if you changed that plug in staging. Like others mentioned, keep the timing waaaaayyyy low until you get the fuel right. As you add timing back in the fuel will clean up but don't do it that way for now. I think you have a good grasp on the concept so just keep reading and listening and you will reach your goals.
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Old 04-22-2012, 04:27 PM   #11
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Awesome A++ advice in this thread.

I am really glad to see that there are very competent LS nitrous enthusiasts/tuners out there still !!!

Now if we could just get those boosted guys to listen....
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Old 04-22-2012, 06:22 PM   #12
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When looking at this plug, you see way rich on the end of the threads but on the plug itself is it the color darkness or how high it comes up on the plug? Just trying to learn
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Old 04-22-2012, 06:40 PM   #13
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Quote:
Originally Posted by nicentech View Post
When looking at this plug, you see way rich on the end of the threads but on the plug itself is it the color darkness or how high it comes up on the plug? Just trying to learn
Both color and how high it comes up on the porcelain. Had you not cut away the threads that would have been a first indicator of excess fuel.
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Old 04-22-2012, 09:30 PM   #14
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I would like to see some plugs for comparison w/known AFRs.
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Old 04-22-2012, 10:25 PM   #15
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it looks fat i would go down on the fuel jet and add 2 degrees for a start or as someone memntioed leave timing until you get the fuel set up nd then let it eat awesome car buy the way man
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Old 04-23-2012, 08:52 AM   #16
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Quote:
Originally Posted by 03EBZ06 View Post
I would like to see some plugs for comparison w/known AFRs.
Here is one of ours from a couple years ago....

12.8 A/F .... Q16 fuel .... #10 plug

Click the image to open in full size.

Click the image to open in full size.
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Old 04-23-2012, 12:57 PM   #17
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Wayne what fuel and nitrous jets? Can you remember?
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Old 04-23-2012, 01:51 PM   #18
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Quote:
Originally Posted by Fbodyjunkie06 View Post
Wayne what fuel and nitrous jets? Can you remember?
22N 1st stage
26N 2nd stage

No fuel jets, DRY FTW !

About 350 shot timing 12*
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Old 04-23-2012, 06:27 PM   #19
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Quote:
Originally Posted by ATVracr View Post
22N 1st stage
26N 2nd stage

No fuel jets, DRY FTW !

About 350 shot timing 12*
Aww them baby jets are soooo cute!
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Old 04-23-2012, 08:41 PM   #20
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Here's one for you. As you can see, #6 plug, 14.5 degrees on .93 jet.

Click the image to open in full size.
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Old 04-23-2012, 08:41 PM
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