What would you think about fitting a boost gauge to monitor the boost pressure and adjust the valve on the controller to a safe level, is it not true to say that this device would prolong the life of the turbo and intercooler because it relases the pressure that is created by the turbo it self. Below is a article from tdiclud.com, can you let me know what you think. It relates to boost controllers.It even recommends them under caution.
This section discusses modifications intended to *prevent* turbo damage, so NOT doing anything about it may actually be the more dangerous scenario. Nevertheless, we can take no responsibility for what you do to your own car. Be aware that if you choose to do this, you are on your own. If you blow something up, you did it, not us. BE CAREFUL! It's very easy to blow something up by using too much boost pressure. Don't even think about messing with this unless you first install a boost gauge so you can watch what's happening.
The purpose of these modifications is NOT to increase the steady-state boost pressure (which is already higher than the older vehicles use, and very close to the safe upper limit if the vehicle is "chipped") but rather to control the fluctuations of boost pressure characteristic of the stock boost control system, and to REDUCE the amount of boost pressure at low engine speeds in the interest of preserving the turbocharger by avoiding operation in the "surge" regime. This will actually *reduce* responsiveness at low engine speeds, but it is a necessary step to preserve the life of the turbo, if other modifications which increase fuel delivery at low engine speed have been done. These modifications are only useful if other modifications (e.g. injectors) have been made that result in either unacceptable exhaust smoke or power fluctuation due to fluctuations in boost pressure that the stock boost pressure control system cannot control, or unacceptably high boost pressure at engine speed below 2000 rpm. The VNT turbo must not reach full boost pressure until above 2000 engine rpm, and should preferably produce no more than about 6 psi boost pressure at 1500 rpm, to avoid operating the compressor in the highly damaging "surge" regime. Turbo manufacturers recommend staying at least 10% clear of operation in the surge regime.
Since the A4 cars do not have any small-diameter hoses which carry boost pressure, it will be necessary to install a suitable fitting to access boost pressure. This fitting should preferably be located as close as possible to the turbo compressor outlet, such as on the lower intercooler pipe ... remove the pipe from the vehicle to install the fitting there. In order to facilitate future removal of this pipe for timing belt changes, use some sort of quick-connect detachable fitting to your new boost signal hose