If you're just starting to dabble with the Engineers, look into the following:
- Heavy duty mod your lightweight alloy hull. The bad news is that it makes your hull armor up to 40% heavier; The good news is that an extra 40% of 0 tonnes is still 0 tonnes.
- 3A G5 overcharged power plant mod. You should be able to get 16MW from a 3A power plant and still keep heat efficiency below 0.5. a 3A plant saves you 7.5T
- 5D thrusters to save 12T and Clean Drive G3 should still get you more performance and much lower power draw than a set of stock 5A thrusters.
- 4D life support is only 4T so you won't get much from engineering it and you have to unlock several other engineers before this is even available.
- 3A charge-enhanced power distributor - as long as you have enough to boost, you're good. Easily outpaces a stock 4A distributor under sustained conditions but 5T lighter.
With that setup and a decent roll on your FSD, you should be getting 50-52LY jumps with a full tank, unarmed and unshielded. Once you add in about 15T for a shield, utility slots and some lightweight weapons, you're going to be very lucky indeed with your FSD roll to hit over 48LY.