Key to this Damage is the difference in scale. When using the revised Star Wars D6 RPG rulebook, scale difference between starfighter and capital scales is 6D. So a capital scale 3D+1 will do 9D+1 to starfighter scale. That\'s pretty impressive, especially if this weapon is older, or from an older ship.
Also, it\'s worth noting that, when \"reverse-engineered\", standard turbolasers tend to be an averaged at 4D, while heavy turbolasers are averaged at 7D. Variants with heavier Damage dice are usually batteries of multiple turbolasers fire-linked together for greater damage, such as on various Star Destroyers. Wookiepedia, the Star Wars Wiki, lists these ships and their weapons, and specifies how many of these weapons are in each battery. When I saw this, I looked them up in the D6 ship stats, and discovered most of these were accurate. The Executor Super Star Destroyer has 8 heavy turbolasers per battery, giving these their impressive 10D Damage dice!
Any turbolasers with lesser Damage dice are usually older ships, such as Dreadnoughts, or ships dating back to the Clone Wars era, or before.
Also worth noting: In Galaxy Guide 6 Tramp Freighters, in the weapons section, a turbolaser is listed for sale. It has 7D Damage listed, capital scale. But I usually modify this to be the 4D version, which when modified for scale, has a +6D Damage against starfighter scale, for a total of 10D! Still very much worth the listed cost, and I make the 7D heavy version cost more (because it\'s starfighter scale Damage is 13D!!!).