Water Meth - Snow Vs AEM

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BadCat

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No, not personally. 2x 500cc Nozzles pretty far back in the charepipe atomizes pretty well.
What benefit did you see using two 500s vs one 1000 nozzle
 

zrk

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What benefit did you see using two 500s vs one 1000 nozzle
Trims lower more consistently. The meth is getting atomized better and further back. What I didn't try was 1x 1000cc nozzle in the location closer to the turbo, might have had similar results. With the 2x500cc nozzles I'm getting very very consistent trim graphs. Under WOT running E40, trims up to 40-43, then as meth sprays drops to 23-27. Very in the safe range.

Screen Shot 2021-10-19 at 18.58.22.png
 

Thraxbert

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In general, it's better to run a few smaller nozzles for the appropriate GPH flow than one fatass nozzle. Zrk's advice tracks.

Why: it's harder to atomize the W/M coming from a large spray on a single nozzle. The mist isn't quite as fine coming from that nozzle and it just takes longer to get a good mix. The larger droplets can also glom together and cause "puddling" where the solution comes out of aerial suspension and drags across the intake floor. This is why some of the best-performing setups go straight to direct-port meth injection, where the per-cylinder nozzle sizing can be quite small. Atomization is fast, and distribution across the cylinders is very even.

Spraying in the charge pipe or a single plate after the throttlebody can also lead to distribution issues if intake runners aren't perfect or uneven or something. So if you're going to spray in the charge pipe or post-TB, keeping the nozzles as small as possible to satisfy the flow rate is ideal for keeping the droplets in the air and even across the cylinders.

Just as an example of the size difference:

An intercooled 700HP car running boost in the range of the Supra (~20s stock) needs about 14GPH of flow. That could be a single 900cc meth nozzle, or if you went to direct port it would be 6x 150cc nozzles and it would be much more consistent. But much more difficult to plumb. So, pros and cons.

tl;dr: run the smallest nozzle sizing you can get away with, and run more of them to hit your target if you can.
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