Yesterday I decided to have some fun again with the car, weather is strangely nice again up here. After my last track day I was puzzled by why my timing was taking a dump during the entire run. First thing was that there's a leak at the input/output of the solenoid. This comes/goes all the time and I'm very fed up with cmgs fittings its not even funny, always leak. I managed to fix it again by cutting the hose but I'm sure it'll start up again. Anyhow, once this was dealt with I did some runs with a dual CM10 on my car. Timing didn't look good at all in 10 runs that I did. Then I switched out one of the CM10s to a CM7 (so a CM10+CM7 setup), left boost+AFR the same, and timing started to improve but still wasn't great. Then I took out the CM7 nozzle altogether and just ran on a single CM10 and what do you know, my timing is looking great. This is with 94 pump gas and 100% meth.

Not sure yet what to conclude on this but given I don't need meth to have "richer" AFRs (as Cobb already hits 12AFR without issues even without meth) I think just using a single CM10 nozzle should be plenty. Flow out of this single nozzle is on par with 2 Aquamist's 1mm nozzles.

The next thing to try is to run a 75/25 mix for a bit and see what logs/vbox times look like and then back down to the 50/50 mix. During the testing above initially the dual CM10 nozzle setup impacted the 60-90 vbox times quite considerably. Each time I reduced nozzle size, timing improved, and the car got faster so there's definitely something to consider there before just deliberately upping nozzle(s) sizes...

Maybe, just maybe, too much meth or over-mething is responsible for that timing flatlining with the automatics? For those that have that issue maybe try a smaller nozzle and log and see if you see any improvement, while trying to preserve IAT cooling benefits..