does it make sence to run alcohol/water injection on a naturally asparated engine such as a D15 or D16 and will it benifit my engine

 

no

 

would it make sense after i swap to the LS and run the turbo?

 

Alcohol/water injection is mainly used on super high boost applications. On a basic ls/turbo setup, I doubt you'll be running enough hp to actually need it. However, if you do a major build, and start pumping upwards of 20psi, it wouldnt be a bad idea. IMO, it hasn't advanced enough yet.

 

It has advanced enough IMO, it sprays like N2O and like 40 said the only time you need it is when you cant put a intercooler in big enough to cool the massive amounts of air you are pushing through it. That means hotter air intake temps which sucks when tuning and runs a risk of hurting your engine.