To start, this is a great resource, but it only has information about infantry. I've checked, a few times.
What brings me to ask this is, specifically, the MAX suit slot upgrade that provides "additional small-arms fire resistance" ranging from 1-5%. This seems like a horribly ineffective way to spend certification points, especially when compared to your other options (auto-repair and 5-25% explosive resist). HOWEVER, if the MAX already has some bullet resistance, that 5% could suddenly jump to a huge value (80% base +5% equals out to effectively 25% reduction in damage taken).
I'm also curious about tanks and planes, and their guns/resistance values/etc. How much more effective are AP vs. HEAT when fighting tanks? What kind of damage multiplier do you get for hitting the back? That sort of thing. Is there a resource that can give me this kind of information?
Best Answer
This is not a complete answer; however, I have managed to dig up solid information about the tanks here. I still have very little information regarding MAX's, beyond this chart which details their anti-infantry weapons.
To expand on this answer I've found relevant information about tanks. Tanks actually take (default) 50% damage on top and sides, 45% on the front (38% for Vanguards), and 120% to the rear. The armor plating defensive items add onto this, so for example the 5% damage resistance on frontal plating reduces damage to 40% (roughly twice as good as it says on the box). In all cases this results in an increase to the hits-to-kill of one (or two for prowlers, more for Lightning 75mm gun)