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Wouldn't re-sizing the holes on the SDI spec nozzles just bring us right back into the 200 issues with poor droplet size and atomisation though?
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Depends, these days i recommend the smallest nozzle you can get away with for obvious reasons. However ultimately (and this is taken more from tuning other manufacturer diesels) you do/should get significant gains from merely enlargening the holes.
Its why people have mulled over the fact that poor combusiton is caused by other factors, but the data to provide a proof isn't easy to come by.
best option is the most expensive and thats literally to get a custom set made. However even then you can't get away from the experimental nature of it nonetheless I wish thee luck
meetings now concluded succesfully so all good.