MillsMotorvation

Thanks for the info, I close the Gap on the BRE7 to .20 and sputter went way, but car seems rich, plugs are black.

soundengineer

iTrader: (16)

Time to lean out the fuel a little bit at a Time until the plugs clean up

Buy a new set... change 2... see what they look like after a quick pull...
Start it, race it, kill it, look at it...
As little idle time as possible...
I even like to find a portion of highway with not much traffic...change the plugs on the on ramp, and the blast into it..then pull off to the side and take a quick peek...throw a different plug in...drive it home..take apart the plug you pulled with... make some changes...and do it again...

MillsMotorvation

Good info, I change the wires, and the BR7 still looked a little dark, but the sputter was still there a little. So I got the TR6 and not sputter at all! I think I got it! Pulled more fuel to get it out of the 10s in AFR. I was told to shoot for 10.9, then I see a lot of you guys going 11.5-11.7 how lean can I go with meth, and not hurt the engine?

soundengineer

iTrader: (16)

There is no magical #...
Usually you can run the same afr on boost that you would run naturally aspirated....
Its not accelerating the flame...its adding air and compression..
Heat plays a big role too...
What are your iat's....how much boost...what engine compression...
In general I'm never below 12.0:1....
I'm often upwards of 12.5:1 or even 12.7:1...on 15lbs of boost...
Timing is another story...all based on the things I just listed above...
With Meth you can typically bring the timing way up close to naturally aspirated #'s

Using Meth can bring 93 octane gas upwards of 117 octane...

Detoxx03

iTrader: (14)

Been running non-projected tip plugs since my nitrous days. Running the same now on my boosted setup with no issues. Tune is on point and all is well.

MillsMotorvation

IAT can rise 10* above outside air, Compression 9:5-9:7. Having boost control issue with exhaust dump closed 12-14boost, with dump open 25-28boost. Got to get a bigger WG.