If there is two identical cars, let's say two Integra GSR's, both having the same
turbo kit and add ons and one of them has already finished ECU setups like
fuel maps, etc.

Can i use the same ECU setup for the other identical car, or do i need to do
a new dyno run to setup all values?

 

It would be better to use that one than to use your stock, but its always better to tune for your own car.

 

It would be ok for a basemap, but having seen datalogs of 2 cars with the same setup being completley different, I would use your own ecu and do your own tuning. Things like compression, fuel pressure, etc make a HUGE differance on tuning, even with 2 identical setups.

 

Yup, each car is unique in its own little way. I learned this from a tuner back in the day.

Using the other cars ECU settings as a base map is the way to go...then fine tune from there. Saves you a lot of time and money especially when the car is strapped on a dyno