Unlike the LA and SF regions which have multiple CSUs, San Diego County only has SDSU for engineering (CSU San Marcos is not ABET accredited and can’t offer engineering degrees) which makes it an extremely impacted campus for engineering (especially MechE and ElectE). With their enrollment requirements to the state, combined with the very large designated local area, SDSU engineering is a very unlikely admit unless you are from the designated feeders (Cuyamaca, Grossmont, Southwestern, Miramar, SD City, SD Mesa) or have a near 4.0 GPA.
If your considering SDSU, you should really consider CPP (Like @NCalRent suggested). They always seem to do well in the student competitions like Design/Build/Fly, Formula SAE, EERI: Seismic, ASCE Steel Bridge, etc.