Hey guys,

Today I had the opportunity to take my 996TT (AWD system still enabled) to a group dyno day where I planned to dyno the car for the first time. Knowing the shop operator was a long-time dyno owner and former Porsche owner, I had a high degree of confidence I'd be able to dyno the car without knowing any specific details.

I chatted with him ahead of time after arriving and he said that he had dynoed 996TTs on his dyno in the past, but that he always had to remove the front driveshaft on them or else they wouldn't dyno right. He mentioned that shutting off the PSM didn't work 100% and that the only way they could figure out a workaround was to remove the driveshaft. Since I didn't want to create trouble by this work having to take place, I chose to not dyno the car and will take it back another time.

But, it definitely makes me wonder why/what is stopping the car from being able to be dyno tested 'normally'. Here is the relevant information about the dyno equipment itself:

Dynojet 424xLC2 AWD dyno

When I chatted with the owner a bit later in the day, he mentioned that it was not a 'linked' dyno, so I suppose that means the front and rear rollers aren't connected by anything underground. I did watch a Nissan Skyline R34 GT-R and a couple Mitsubishi Evos use the same dyno without any apparant problems while we were there, but vowed to do some additional research to figure out if it was even possible for my car to dyno there in the future with any other knowledge or tricks about how I might prepare the car (short of the obvious act of pulling the driveshaft and dynoing in 2wd mode of course).

Any input is appreciated. Thanks!

 

Good move that you chose not to dyno because without the front and rear rollers being linked you risk damaging the front diff.