You mean these curves......?
https://www.turbobuick.com/threads/...mbers-not-matching.378231/page-2#post-3028967
I agree that there isn't much vaporization pre cylinder if you read the link above, but I wouldn't say there is no air cooling going on. I just wonder if putting a small nozzle farther away would help maximize some air cooling thru exaporation, etc.
As far as pre turbo and lowering backpressure, I agree and thats why I have an M5 nozzle pre turbo. Hopefully I'll see an improvement since I'm backpressure limited on the stocker. Best setup may be small pre turbo nozzle plus the alky plate...
I think stock intercoolers and similar benefit the most from alky because the heat soak gets the temperatures so high pre throttle body that the alky can flash and lower the temps down quickly. Going on alky on these setups can't be beat because of this. Better combos with more efficient turbos and intercoolers don't reach these temps so the main benefit is in cylinder cooling. But on a hot day at the beginning of a run the alky probably helps cool the air down.