Hybrid turbo upgrade selection & general tuning question

[RETed]

Like everyone said, you still need to worry about the overboost fuel-cut programmed into the stock ECU, although it's been inconsistent on S5's.

Then, you'll need to address the additional fuel required for the larger turbo.

It's questionable how much boost the turbo will produce, even with the description you have given.

An upgrade fuel pump is highly recommended.
Also, rewire the fuel pump for best voltage - the stock wiring is problematic at this age.

Just to make things more efficienct, some kinda fuel control is needed to fine tune everything after all of the above has been added.


-Ted