Patrick

Forgive my stupidity, but I am new to the Audi aftermarket. I was wondering when considering chips for the 1.8T motor, what does the 0.8 and 1.0 BAR indicators mean? Thank you.

IronMike

Difference in max turbo pressure.

larryV

...also can be rated at PSI in which 1bar=approx. 14-15 psi.
Most chip manufacturers make 1.0 bar chips, a few make an .8 bar as well. Your stock 1.8T is running at approx .5 bar = 6-7 psi. The efficiency threshold of the stock turbo in the 1.8T is about 15 psi - so what chipping does is getting the most out of your turbocharger.