Quote:
Originally Posted by marv85
The basic logic of a piggy is not better, it's as you mentioned basic (dumb).
COBB (BMW DME logic/tuning) does not target boost. It targets load. Load can vary due to many variables. Boost being one of these variables.
The DME will try to achieve the target load with the least boost possible. When the temp drop, the car will be able to achieve the target load with less boost and hence it reduces the boost. that's not a bad thing. YOU ARE NOT LOSING POWER DUE TO THIS, YOU ARE ACTUALLY ACHIEVING THE SAME POWER/LOAD WITH LESS BOOST DUE TO COLDER TEMPS.
Now let's use your logic. If temps go down, COBB car will lower boost and make the same power. JB4 will make slightly higher power because it's targeting the same boost with denser air (colder).
How about when temps go higher? 
COBB will increase boost, and hit the same power. JB4 will target the same boost on thinner air and make less power 
Same applies when you go high in altitude... COBB will compensate, JB4 won't. |
Isn't this methodology putting a huge strain on the turbochargers when it is hot? I feel like turbo health would be more important than power no?
Genuinely curious, not sarcastic