Here's all the info you need via a quick search :
http://www.delica.ca/forum/pyro-and-boo ... -3866.html
700-900 operating temp F* at the EGR location for the pyro
boost is a vacuum hose connected to a tee that originally goes to the turbo
before you play with boost, make sure you engine is running well and tuned properly. Otherwise you will be looking for increases in power the wrong way.
Boost is the 'last' thing to do. Before adjusting boost, do the following :
new or rebuilt injectors
properly calibrated/working injection pump
proper timing set
fuel/air filters changed
check driveline for dragging (brakes/ujoints)
exhaust. This is important. There is no use raising the boost with the stock exhaust. It is too small and restrictive.
So in order to get optimal boost/air/fuel ratio, a larger exhaust and tuned engine will need to be done.
Once you're at the optimum operating of the engine, you can start to play 'if' you think you 'need' it. Because once you've done all the above, you'll likely have a fast and powerful spacegear already.
Now you're ready to play with the boost at your own risk of course. Raising the boost too much will cook your engine so if you are not comfortable with that risk element, do not do it.
To raise the boost psi, it's simple. Space the wastegate further away from the turbo housing. Usually with washers starting with .5 to 1mm thickness and test from there.
Factory, your L400 should be operating at 8-9 psi. You can go to 11-13 and then the blow by valve will spring open and you'll hear a loud hissing sound along with a decrease in boost pressure. This means you've raised it too high.
This is the proper way to do what you are asking.
If there is anything that I have written that you don't think is necessary, don't feel the need to do, don't understand and don't feel comfortable with, please do not try it.