It's great to see this is being looked into, just for the record I'd like to add my little bit to it explaining why I see it as an important issue that needs attention.
The cost of 3d max these days is way too much, $4000 software just for a hobby is out of the question. This is a problem because modellers who have good potential are limited to what they can do and this limits the use of 3dmax to people who work in the industry and have a company licensed copy and the simple fact that they are working, limits their time they have to use it and most professional modellers are all modelled out by the time they finish work and just want to relax.
At the moment all we can do is use Blender then bounce it through a 3rd party app like Zmodeller or SimEd to get it into rFactor, but it has it's problems. Minor adjustments take hours where with max its just a few clicks away.
For each export I have to use .3ds which does not work well with separated elements, each element has to be a different object in blender, which makes each model a heap of different little pieces, which widens the margin for error and can be a nightmare to fix small things. In some cases small things get left unfixed due to the hassle of the export process, which then lowers the quality of work.
Here is an example of what I mean.

Each piece here is a separate object, then exported as one 3ds file.
Then in SimEd I have to go through a series of steps before it becomes one single object with separation groups and I have to do that every time I make a small adjustment. Then all the materials have to be set up (which is a pain staking process) Each export takes about 10-30 mins and that has to be done for each different object, body, hood, bumpers, rims, spokes, tires, etc, etc, all have to be done individually like that. Then I realise I missed a part and have to go through the whole process again
On that note, I'd like to thank you guys for looking into this, if we can get a gmotor plugin for Blender a lot of people will be extremely grateful.
If there is any help needed with tutorials, testing, etc, feel free to ask.
Cheers!