The SRMZ countdown thread has this;
Inevitably, people will want to know which car is best. This always comes down to personal preference, but here are some guidelines on each car. Remember that these were endurance racing cars so reliablilty was vital. As Stirling Moss once said; "To finish first, you first have to finish". If you are only doing short races, then the car's reliablility won't be much of a factor, but if you do longer races, you will want to pay more attention to that.
Ford GT40 MkIIB
The MkIIB is a fast, heavy car. It weighed almost twice as much as the Porsche 910. Capable of speeds in excess of 205 mph, it is adequate at those tracks that reward top speed at the expense of handling. So it should be OK for tracks such as Sebring, LeMans, and Reims. However, there are always better choices. You would not want to drive it at the Targa or the Ring. Also, the MkIIB is extremely unreliable. This weakness may not show up for short races, but will definitely be a factor in longer ones.
Ford GT40 MkIV
Like the MkIIB, the MkIV is a fast, heavy car, but unlilke the MkIIB, it is more reliable. It will go 215 mph on the Mulsanne straight which makes it a top choice for places such as Sebring, LeMans, and Reims where it can cruise at top speed and walk away from its competitors. Being heavy, its handling is merely adequate so you woudn't want to use it at the Targa or the Ring.
Ford GT40 MkI
The MkI actually competed as a production car for nonworks teams so it was included in a mod for prototype cars mainly because we had a nice three dimensional model for it. Also, at several races there just aren't that many prototypes so the MkI does a nice job of filling up the field. In 1967, it easily won the over 2.0 liter production car class championship for Ford.
The car itself is very good. Lighter than either of the other GT40s, its handling is better. Although limited in power, it can do about 195 mph on a long straight and is reasonably reliable. The car was so good that when the 3.0 liter limit on prototype cars became effective in 1968, the old MkI was able to beat them and win LeMans in both 1968 and 1969 as well as the Manufacturers Championship for Ford in 1968; much to the chagrin of the FIA.
It would not be the first choice on any track, but is a good car to start training. It has no faults and is fun to drive. Just don't expect to be able to compete against the larger engined prototypes.
Mirage M1
The Mirage is essentially a GT40 MkI with revised bodywork and a bigger engine. It was lighter and more aerodynamic. Capable of speeds in excess of 205 mph, it can compete for the lead in the hands of a capable driver. It is a good overall car; quicker than the GT40 MkI, but not as quick as the Lola. Unfortunately, it is also unreliable and would not be the first choice for a long race.
Chaparral 2D
The 2D is a very good car. Not too heavy and powered by its large 7.0 liter engine with gobs of torque, it will go over 205 mph and handle well too. However, it is very unreliable. It's biggest downside is that it only has a three gear transmission. Although its engine's massive torque somewhat compensates for the lack of gears, particular attention needs to be paid to the gear ratios. If not for the Chaparral 2F, this would be a fine choice for any race of shorter duration.
Chaparral 2F
The 2F is basically a 2D with a huge rear wing for downforce. So it has all the good points and bad points of the 2D, but added grip for tighter cornering. Not quite as fast as the 2D in a straight line due to the wing drag, it will still do just under 205 mph which is adequate for the faster tracks such as LeMans. At the twistier circuits such as the Targa and the Ring, it can hold also its own against the Ferrari and Porsche.
If you had to chose one car for all tracks and short races, this would be a good choice as it is a great overall car.
Ferrari 330 P4
In you had to drive one car for long races and wanted to win on any track, this would be it. It is very reliable, second only to the Porsche, and performs well at all tracks. Its top speed is limited compared to most of the others at only 195 mph, but overall, it is a great car. It must have been as it won the Manufacturers Championship for Ferrari.
However, for shorter races there are better choices.
Porsche 910
For those tracks that require the best handling such as the Targa and the Ring, the 910 would be top choice. It weighs little more than a 1967 Formula 1 car which makes it the best handling car of the group by far. But it's down on power so its top speed is only 170 mph or so. At tracks such as LeMans and Reims, it's at a distinct disadvantage to the much faster cars.
It is also the most reliable car so you can count on it to finish.
Lola T70 MkIII
The Lola is a really nice car and some would pick it as their overall favorite rather than the Chaparral 2F. It has enough power to kick out the tail for power on oversteer if desired. Medium weight helps its handling and it's capable of over 200 mph so it isn't at too much of a disadvantage on the fast tracks either. Unfortunately, it is very unreliable and would not be a good choice for a long race.
Looks like some will be more suited to certain tracks but we will probably have to find a general pecking order by trial and error. A good spread Friday would be nice - it's only a fun test so give whatever you like a go.
I didn't test them as much as I get credit for in the ReadMe so I'm not expecting to be a frontrunner, one thing that did take a bit of getting used to for me was avoiding hitting the barriers. These things are of course much wider then a single seater so you have to get used to allowing for that. Also, the one with three gears feels distinctly odd to start with.