These Mustang dynos with a belt are suitable for all other AWD cars (except Tesla D models) because they have a single engine. You can measure 100% power from rear wheels only. You don't need front rollers. But in AWD cars front wheels turn too. Therefore you need dummy rollers. So why do they put the belt then if dummy rollers would do? Because the moment the front wheels start spinning, they push against those dummy rollers until they catch up. This can damage the center differential. Therefore with this belt they pre spin the front rollers to further reduce resistance. The Mustang dyno will completely ignore power input from the front motor. You need to use Dynojet for an accurate test. You will get low scores with Mustang.
Also I disagree with linkage. You can measure the total power accurately only if front and rear dyno rollers are not linked. If they are linked, you will only measure the wheel that turns faster. In Tesla D models one of the wheels turns faster. That's how Tesla mimics different gears.
The MW-AWD-500's front and rear rollers are linked together with a toothed belt so they act as a single unit as if it were the ground. The PAU doesn't care how much force is applied to each roller. It could be front wheel only, rear wheel only, or AWD.
If you were going to test a 4wd drive car, then you couldn't use this dyno. You'd have to use the Dynojet *without* the Linx system connected. 4wd drive cars lock their transfer cases and diffs to keep all 4 wheels synchronized, but slight differences in wheel/tire diameter would force them to be out of sync just slightly and you'd get massive skipping. This is why you can't drive a 4wd car in 4wd mode on dry pavement. In this case, you need two drums that are not linked each with their own PAU.
I asked the engineer I spoke to about this because I've seen this assertion made before. He said this was completely inaccurate. The drums are linked together like the ground is linked together. If what you said were true then the ground would also ignore the front wheels.
You have your scenarios when you can use a dual drum system not linked with their own PAUs vs a linked system with a single PAU backwards.
Also, if what you said were true, then an 85D will measure WAY less hp than the P85D on the same dyno. And I guess we'll just have to wait and see if that's true
I do plan to do this on both brands.