what is the difference between tdi and quadrajet engine?
Quadrajet would be any day better than TDI. Quadrajet (1.3 multijet from FIAT) is technologically far superior than TDI, in terms of mileage and NVH. The parts though are bit costlier than TDI (filter etc.) You would get a very refined engine with Quadrajet as compared to TDI.