I'm running Autolite Racing AR 3934 plugs (non projected tip, pre-gapped at .028).
One thing to add to all this. Once I stated logging alky pressure last year, I noticed a large variation in alky pressure when the tank wasn't filled to the top. I now top off the tank before each run. I'm moving my battery to the trunk soon and plan on putting the alky reservoir in the stock battery location like Pacecarta did with the it turned 90 degrees counterclockwise so that the outlet is at the rear of the tank. I also prime the alky before a pass and watch the pressure on the laptop to make sure it is coming up normally.
As far as #1 leaning out...... it seems that its hard to say whether it is due to running too lean of an A/F ratio on alky and the weakest link in the chain (#1) is the first to go or its due to alky richening up the rear cylinders. After taking out #1 cylinder I dual fed my Champion fuel rails and switched to an external fuel pressure regulator. And after reading up I've lowered my timing a little, richened up my A/F ratio and switched over to the non-projected tip spark plugs in order to be on the safe side as I've turned up the boost and gone faster. I've been keeping my eye out for a stand alone mulitple EGT setup as that will ultimately tell the tale.
Here are some PowerLogger screengrabs from my last time out. 10.28@134mph. I spun on the launch so only a 1.63 60ft. Analog input 4 is alky pressure. EGT was 1469. MSBC boost controller in wastegate mode with CO2. Running 28" tires on this run, slippage around 5-6% on a PTC converter. This is on a TT 5.7 chip, non-correcting.
View attachment 153888View attachment 153889View attachment 153890
which pressure sensor are you using for the alky, the channel is pegging in PL.
Bob