Rebuilt turbo, new manifold gasket, 8 lbs of boost. Not any noticeable power increase - PeachParts Mercedes-Benz Forum

Diseasel300 · #12 03-20-2019, 01:46 PM

Quote:

Originally Posted by Maxbumpo

Another point: The seals in the ALDA dry up over time, and performance is reduced because the ALDA leaks off the pressure without increasing fuel from the injection pump to match the increased air from the turbo. On the OM60x engines, the ALDA can be taken apart and new o-rings installed. Not sure if that is possible on the older engines, but it wouldn't surprise me.

^^^This.

If the ALDA leaks like a sieve, forget any sort of fuel enrichment. People always fiddle with the ALDA instead of fixing the underlying problem: Leaks. Try pulling a vacuum on it with a mightyvac. It should hold vacuum just like any other vacuum device. It relies on boost pressure collapsing a set of metal bellows to enrich the fuel trim. Leaks reduce the enrichment and shift it much farther up the RPM range than it should be.

The difference between the ALDA working properly and leaking is like night and day. It's an anti-smoke device, but it's also a REFINEMENT device. If it's working properly, there's no distinguishable difference with it removed, other than not rolling coal from a takeoff and much smoother and predictable control over the engine power output.