[Threshold]

Oops, not sure where I got 'Vehicle Health' from...
You cannot exactly alter an explosion from a weapon, but this is something that should help...

pawn Код:

public OnPlayerTakeDamage(playerid, issuerid, Float:amount, weaponid)
{
    switch(weaponid)
    {
        case 16, 35, 36, 39, 40, 51:
        {
            new Float:health;
            GetPlayerHealth(playerid, health);
            SetPlayerHealth(playerid, (health + amount));
        }
    }
    return 1;
}

This will work depending on the lagg between the server and the client. Hopefully many people won't die from excess explosions. I'm pretty sure this would work, I haven't exactly experimented with it.