Quote:
Originally Posted by xcelir8bmw
THERE IS A PROBLEM.
Stock Boost is 22.48-22.8 PSI peak readings regularly without the tuning box installed. With the tuning box installed and system OFF, I read 22.6 PSI max boost - which is close enough to Stock Boost peak readings.
When I turn the system ON, in Maps 1-7, I have varying boost of 18.1-20.5 PSI peak readings. In other words, the box is working fine, but the MAPS ARE WRONG. I do not have increased power, rather I now have DECREASED power.
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Wait - you're reading the value from the car, or do you have a boost gauge?
If you're reading the value from the car, you are reading the *shifted* boost value that the TDI box has remapped. This type of box intercepts the actual value and changes it, to lie to the engine controller to fool it into producing more boost, etc. So, the engine controller's is (by definition) not accurate!
How does the car actually feel? Does your butt dyno tell you it's different? Can you try any 1/4 mile testing?