After I did a long needed valve adjustment I stumbled on a disconnected ALDA pressure line and fixed it. The cars performance improved drastically, ~20 sec. for 0 - 100 km/hr to under 15 sec. Now I discovered the wastegate pressure line broken off and replaced it, but this didn't make any noticeable difference. I have a heavy foot to get to 60 mph, but rarely exceed this speed. Maybe in that range the wastegate function is not important.
On 11/25/05, Marshall Booth <[EMAIL PROTECTED]> wrote: > > Hans Neureiter wrote: > > A while ago a discussion revolved around the 2,000 some rubber parts > that > > eventual need replacement. > > I came across one I never heard mentioned: The hose that lets the waste > gate > > know when to open. > > Goes from the compressor outlet to the aneroid capsule on the waste gate > > actuator, kind of hidden under the turbo. > > When I changed the motor mounts, I noticed the hose was broken at the > > wastegate connection. > > Have no idea how long the waste gate was disabled and how important this > may > > be. > > Because the hose was rubber, there was a safety backup. It's called the > overboost sensor on the intake manifold and when it's activated, fuel > enrichment is shut off. This limits the power of the OM617.95 engine to > about 70% of it's rated power so that the engine won't be damaged. It's > important that primary limit be the wastegate as it provide a > smooth/seemless control. When the engine is driven with a serious load > at engine speeds much above 2000 rpm, the wastegate remains open most of > the time, holding boost pressure to just under 1 bar and the engine is > able to deliver it's full rated power. When wastegate remains closed > however, the overboost control operates when boost exceeds 1 bar and > there there is a sudden ~30% drop in power (from ~112 down to 80 hp in > early 617.95 engines or from 120 down to 88 hp in later ones). > > Marshall > -- > Marshall Booth (who doesn't respond to unsigned questions) > "der Dieseling Doktor" [EMAIL PROTECTED] > '87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 > turbo 237kmi > > _______________________________________ > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://striplin.net/mailman/listinfo/mercedes_striplin.net > -- Hans Neureiter, Houston, TX '82 300SD, '95 E300D