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| Hey 7150,
How fast are you travelling? With 7.2 gal/acre, and an -08 size, you'd be best to be using an -06 size, unless you are going faster than like 18MPH on average.
If you were running an -08 tip, applying 7.2GPA, running like 16MPH or lower, you'd could be running yourself into duty cycle issues (as tip is too large for your volume) that can cause physical skips in coverage. With a correctly sized tip, won't happen, just when your duty cycle is consistently below 40-50% at your travel speed.
The MR series in that size gets pretty darn coarse, pretty darn quickly. As far as the general label for your 2,4D/glypho/atrazine, you could be a better fit with the SR110-08s, unless your label specifies otherwise. The same comment on the duty cycle applies though, so if you are typically spraying below 16MPH, best be using something like an MR110-06, which would mirror at lot of the same results as the SR110-08.
(Larger tip, but finer series, if that makes sense) As far as your experience with the switch from Turbo Tee to AI tips, the SR series would be the middle ground, still finer than AI tips, to give that inbetween for coverage at higher water volumes.
As far as the Turbo-tees, they'd be a step finer than the SR series in general, and might not be recommended by label for typical spraying conditions for your mix. Think of them as a step between an ER (definitely not recommended) and the SR (just fits within label from 30-70PSI, depending on your chem label in IL, it could be a bit different than ours up here though).
As far as our charts/Tip Wizard, to give a rough comparison between the MR110-08 and the SR110-08/MR110-06: (this doesn't include the chance of physical skips in coverage due to lower duty cycle)
For Example:
MR110-08 @ 50PSI: 486µ (Ultra-Coarse Spray Quality); ~5% driftable fines (in ideal conditions); ~61% of your volume suitable for coverage
TIP: If you take the % suitable for coverage (%<600µ) and subtract drift, it gives an idea of nozzle effectiveness for a coverage application. e.g. 61-5 = 56% Effective Spray. This makes it a bit easier to see what a difference might look like between two tips.
SR110-08 @50PSI: 410µ (Extremely Coarse Spray); 7% driftable fines (in ideal conditions); 74% small droplets. 74% - 7% = 67% Effective Spray.
MR110-06 @50PSI: 465µ (Extremely Coarse Spray); 4% driftable fines (in ideal conditions); 76% small droplets. 76%-4% = 72% Effective Spray.
Hope that gives a bit of comparison to what might be more suitable for you. Usually if someone was using the MR110-08 for your kind of application, they might be almost doubling your water volume to try help with coverage.
For the liberty with XR/ER tips, if you were running an -08 size and it was causing you duty cycle issues, it still wouldn't be ideal, as you might still get getting skipping at speeds lower than like 14MPH. Aside from the adjuvant's impact on drift, based on water, an ER110-08 would be like ~20% driftable fines; whereas, usually for contact herbicides, you'd want to try at least be within 15% in typical conditions for you.
A lot of info there, but let me know if it makes sense. If you were able to give me an idea of what kind of speeds you were running at, I'd be able to try give you a little bit better of a hand.
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For experienced users of Wilger nozzles on AIM systems...
