I am working on converting Classic Car Wars to a 3d6-or-less system, such as GURPS or Hero System. The ideal goal is to use the 3d6 system for the to-hits, while everything else—damage, handling, combat, and vehicle designs—still use the Car Wars system and keeps the "metal underneath" the same.
Damage is going to scale. Car Wars to Champions is a 3-to-1 scale, so 1d6 Car Wars is 3d6 Champions. Car Wars to GURPS is more like 18-to-1, based on the 0.50 cal. M2HB (7dx2) and the 66mm LAW (6dx6). So if a LAW in Car Wars does 2d6, that is 36d6 in GURPS, and the 0.50 MG in GURPS does 14d6, which is close enough to 18d6, so 1d6 in Car Wars, which matches the MG damage.
To-hit modifiers in both games are doubled. So, if firing at the front of a car is a -1 in Car Wars, that is a -2 in Champions or GURPS. Use Car Wars for all to-hit modifiers, with the only exception being the OCV and DCV modifiers in Champions - the driver's OCV and target driver's DCV do apply to the to-hit roll (if they have Combat Driver skill otherwise it is zero), as they do in Champions. This was a cool rule in the Autoduel Champions days, where a driver's abilities could make the vehicle harder to hit.
Do not do size and range modifiers with either system! Stick with Car Wars' range and to-hit to calculate the final CW to-hit modifier, then multiply by two.
To-hit modifiers for weapons are based on a Car Wars 7+ to-hit number. Every point above or below is a +/-2 modifier to hit when using the gun. Targeting computers factor in as usual, so a hi-res target will give a -4 to-hit modifier (lower is better).
For handling, use the Car Wars Control Table. If you get a 'safe" result, do not make a driving skill check. If you get a number 2 through 6, that is your negative modifier to your driving skill check to avoid a roll on the Crash Table. So if your vehicle is at 60 mph, and you have a current -2 HC, the number on the chart is 2, so you need to make a driving skill roll at a -2 to avoid a Crash Table roll. HC resets as it does in Car Wars.
With GURPS, the combat turn is one second, and you usually get one attack, so this is a very clean conversion. The Hero System rules use a Speed system from 1 to 12 and a 12-second turn. This does not work that well in Classic Car Wars, and the old Audoduel Champions' way of handling it is allowing characters to make a vehicular weapon (not hand weapon) attacks every second (like SPD 12) but zero out OCV and skill bonuses on non-acting phases.
This means an SPD 4 character in the Hero System who acts on phases 3, 6, 9, and 12 and gets their full skill and OCV bonuses on those phases only. They can attack in phases 1, 2, 4, 5, 7, 8, 10, and 11, but at an OCV or zero.
Hero System DCV always applies; this helps balance the "firing every phase" issue below!
Stick to the Hero System phases when making hand weapon attacks or using superpowers. So that SPD 4 characters can make a hand weapon or superpower attack every 3 seconds. This is a change from Car Wars, but given the games, it makes sense. This also puts people on foot at a more significant disadvantage than vehicles since they can get fired at every phase.
This has stayed the same since Autoduel Champions, and letting characters keep their full DCV (even in non-acting phases) helps balance this out and keeps superheroes from being sitting targets by a stream of per-phase machinegun fire. Haying for a DCV of 6 is going to be a huge benefit when the attacking vehicle is acting off-phase, and the attacker can't use their OCV and skill bonuses.
Movement should be done in Car Wars, with everything in mph, including foot movement. I know this will mess up Hero System movement rates, where characters only move during their phase, but we are entering "simulation land," where all foot movement is done per phase.
Hero System uses meters, so do a rough conversion and multiply by 3 for feet. For simplicity, assume Hero System "meters per turn" equals "miles per hour." Most characters in Hero System move 12m, which is about 12.5 mph in Car Wars, which is running speed foot movement (Car Wars Compendium). If a character has a running superpower of 40m per turn, he runs at 40 mph, and all movement is done according to Car Wars (every second).
Speaking of Autoduel Champions, we were sort of inspired by this project since we played it a lot in the 1980s. We had our own Traveller-like system for our game, but having Champions' superpowers convert easily was a huge plus. It allowed us to do the mixed superheroes and Car Wars campaign we loved.
And you can tell we played many of these games since these conversions are very natural for me to bust out as I think through how the games are played.
If I were to do our game today, our Traveller-inspired 2d6 system, I would skip all the newer versions of Cepheus and go straight for the digest-sized Cepheus Light. The skills are 99% compatible with Car Wars and are all 2d6 and N+ compatible. The personal combat rules can be used instead of the ones in Car Wars. The only rules I would add are the optional Traits system (30 XP to buy a new one) and the Cepheus Enhanced Edition rule for raising an ability score (3x new level in XP).
Why Cepheus Light and not one of the newer versions? I don't need anything in the newer versions. It is digest-sized and feels like a Car Wars book. The game even has a "cargo" system that works directly with Car Wars to haul loads between cities (Grav Vehicles would be Auto Parts or the cars themselves).
https://preview.drivethrurpg.com/en/product/257644/cepheus-light
https://preview.drivethrurpg.com/en/product/262129/cepheus-light-traits
https://preview.drivethrurpg.com/en/product/342060/non-random-character-generation-for-cepheus-light
Those three are really all you need. Another benefit? If you need a simplified RPG for Battletech, that works just as nicely. For Battletech, you may want to use a more complete and modern edition since you will get a lot of extra "sci-fi stuff" you will use, but for Car Wars, Light is all you need.
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