03EBZ06

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?

camscam02

iTrader: (21)

way way way way rich and no timing

03EBZ06

when you gonna help me tweak this thing?

Fbodyjunkie06

iTrader: (10)

Pull fuel leave spark alone till fuel is corrected. Then look for heat on strap, I wouldn't chase a timing mark though.

camscam02

iTrader: (21)

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

Fbodyjunkie06

iTrader: (10)

internet tuner!

03EBZ06

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.

Fbodyjunkie06

iTrader: (10)

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.

03EBZ06

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.

Carter01

iTrader: (11)

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.

Fbodyjunkie06

iTrader: (10)

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....

nicentech

iTrader: (1)

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

Carter01

iTrader: (11)

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.

03EBZ06

I would like to see some plugs for comparison w/known AFRs.

fastazzls1

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

ATVracr

iTrader: (5)

Here is one of ours from a couple years ago....

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

Fbodyjunkie06

iTrader: (10)

Wayne what fuel and nitrous jets? Can you remember?

ATVracr

iTrader: (5)

22N 1st stage
26N 2nd stage

No fuel jets, DRY FTW !

About 350 shot timing 12*

Fbodyjunkie06

iTrader: (10)

Aww them baby jets are soooo cute!

Carter01

iTrader: (11)

Here's one for you. As you can see, #6 plug, 14.5 degrees on .93 jet.