I'd go further and include other technologies into radar range and signatures of a mech like this:
Rules:
- Your mechs radar signature is dependend on the size (weight x2) the armor and structure aswell as the type of heatsinks or the state of the engine (heat over 50%)
- A mech with BAP equipped can target enemy mechs 25% further away
- A mech with the engine producing more than 50% heat (heat bar) can be detected 25% farther away
- A mech with ECM equipped reduces its radar signature by 50%
- A mech with Stealth Armor equipped reduces its radar signature by 25%
![Posted Image](http://i.imgur.com/iMpfGbz.jpg)
Here the trade-off for better engine, structure and armor is a better Radar Signature for your enemies targeting you.
That also means that the advantage of low tech (Tech lvl1: Std Engine, Std Structure, Std Armor, Single Heatsinks) and ECM is a lower Radar Signature.
This also adds value to mechs like the Nova (Std structure, Std armor and medium engine) over better equipped mechs like the Stormcrow (Endo, Ferro and higher engine).
The overall differences in Radar Signature ranges makes the use of scout mechs more important.
![Posted Image](http://i.imgur.com/B7Rxm0d.jpg)