Touareg: 2014 V6 TDI
Join Date: Apr 2010
Location: Wayzata, MN
Second Vehicle: 2008 V6
Thanked 18 Times in 17 Posts
The Q5 is built on a different platform (MLP), which is shared with the A4 / A5 (technically the B8.
The forthcoming Q3 is built on the Tiguan chassis, which is shared with the Golf, A3, Jetta etc.
As stated above, the Touareg / Cayenne / Q7 all share the same platform - 7L. I believe that they all transitioned to the new "updated" chassis around the same time (2011 model year). This was when they dropped the low speed transfer case and a bunch of other stuff to trim 500lbs off the curb weight - increasing fuel effiency. So, if you are comparing a 2009 Q7 to a 2009 Touareg to a 2009 Cayenne, they are quite similar. But when you compare them across generations, it's like comparing a T2 to T3 - very different.
Obviously many changes to powertrains over the years as well - Fuel Injection to FSI, different V10, V6 and R5 diesel, etc.
Hope that helps!
2014 TDI Exec - White w/ Cornsilk
Gone to a great new home:
2008 V6 Cranberry Red - Lux Plus (Leather, Keyless) Tech + Dynaudio, Air, Tow, 4 Zone Climate