What kind of chip?
How much timing?
What percent mix are you using?
At what boost level do you see knock without alchy?
Where is the fuel pressure set?
Do you have a scan tool?
What gap are the plugs set at?
Tesat for good spark lately? Pull a wire at the coil pack, and check for a 2" blue spark.
Most of us turn on 2 # before we normally see knock. Try that and running 92 percent alchy. Don't push it too hard.
The pump speed does make a difference. T a flow test, and see how much liquid you move in 12 seconds. It should be around 4-6 ounces. Any more than that is prolly too much.
The dual nozzle system may have too large of jets for your combination. You might consider converting to the aquamist nozzles. (816) 333-6582. Ask for Brad.
Try running (4)1 M nozzles @ a 75% mix. (25% water) This should get you to 20# with the proper turn-on point. At full pump speed, you should hit about 4 ounces in 12 seconds
With Aquamist always run at full pump speed to get the best atomization.
You will need 4 nozzles
2 'y' connectors
2 Step down connectors (to go to the 10 mm line)
Some 2-3' of 10 mm line
More JB weld..
Since the nozzles are 15 bucks each,
Try (2) 1 mm nozzles, then go to a 50-50 mix at full pump speed. You should get close to 20# with that. You can always add another 'Y' connector, and add another nozzle. Takes 5 minutes.
Don't get the tap, and drill bits. All you need is one drill bit, and the JB weld. Saved you some money there)
Downside to using the smaller nozzles is that you most keep them free of debris. I use JB weld to anchor the base of the nozzle in. The jet part (the piece with the stem) I tighten (carefully as to not crush anythind) with nedle nose pliers, then rtv them so they don't back out on you from the vibration. Use a dab of rtv. When it's time to check them again, snip the plastic line, and use a propane torch to lightly heat the rtv. It will come right off. Flush, or change the lines while you are at it..
Another downside is the worry over using plastic line to carry alchy, under pressure. Change the lines once a year because the heat will cause them to become brittle. Cost 2 bucks.