PeachParts Mercedes-Benz Forum - View Single Post

2.5Turbo · #4 01-31-2008, 11:34 PM

Try running with it off and see if you get black smoke. Also try running with the boost line disconnected and see how much performance you lose.

No need to install a boost gauge and pyrometer when adjusting/modifying the ALDA. Removing the ALDA doesn't increase the fuel injected, it just allows more of it with less boost resulting in incomplete combustion. The only thing that will increase your fuel past the stock maximum is the full load screw inside the IP. So you're safe to play around with the ALDA as much as you wish.

The switchover valve was your only overboost protection. When boost pressures rise over a certain amount, say when your wastegate line disintegrates, a switch on the manifold completes the circuit through the valve and vents the boost pressure that was once going to the ALDA to the atmosphere, reducing the fuel therefore reducing the boost. At this point in these cars' lives, the switchover valve is usually so packed with soot and oil that it probably won't operate the way it was intended anyway.