What does your turbo sound like when it spools? - Page 2 - PeachParts Mercedes-Benz Forum

SD Blue · #16 02-05-2011, 11:50 AM

Quote:

Originally Posted by mccauleybil

To bypass the over boost, shall I simply disconnect the hose from the banjo bolt and the hose to the alda, or connect the two?

To bypass the overboost switch, you need to jumper the two incoming lines. The end result is a direct connection of the banjo bolt to the alda.

winmutt · #17 02-05-2011, 11:11 PM

Today I no longer hear my turbo. The trade off is peeling out 225 tires in the rear.

Squiggle Dog · #18 02-06-2011, 02:30 AM

Quote:

Originally Posted by DD40AX

If you can hear the turbo with the stock air filter system then you have a poor seal and are pulling in dirty air. In other words, the turbo should not be audible over the engine.

Darn, I like the turbo sound. They should make something that amplifies the turbo noise (but not the things that mount in the exhaust pipe).

I had a K&N filter in my 1979 300SD (the kind that's made to fit in the original air cleaner housing, not the "hot air intake" cone type). Maybe the filter was breathing a bit too easily and letting out turbo noise. Before anyone scolds me, I am back to using paper filters.

winmutt · #19 02-06-2011, 08:11 AM

Quote:

Originally Posted by Squiggle Dog

Darn, I like the turbo sound. They should make something that amplifies the turbo noise (but not the things that mount in the exhaust pipe).

I had a K&N filter in my 1979 300SD (the kind that's made to fit in the original air cleaner housing, not the "hot air intake" cone type). Maybe the filter was breathing a bit too easily and letting out turbo noise. Before anyone scolds me, I am back to using paper filters.

Try removing the resonator.

Squiggle Dog · #20 02-06-2011, 08:00 PM

Quote:

Originally Posted by winmutt

Try removing the resonator.

Is that the "first muffler" on the exhaust pipe? The only way I could think of making the turbo louder would also cause unfiltered air to come in, which I don't want. I remember the first test drive I did in my 1979 300SD there was no air filter or housing on it (just went down the street and back) and I could hear the turbo loud and clear. I would love it if it was always that loud.

otto huber · #21 02-06-2011, 08:37 PM

I tested the overboost solenoid today with a mityvac on both ports and neither port held vacuum. I then tried blowing air through the solenoid and was easily able to blow air through the port that receives the banjo bolt line and just barely able to blow air through the port going to the ALDA. Does this sound like the solenoid is bad, or should I check the sensor on the intake manifold? Thanks

winmutt · #22 02-06-2011, 11:38 PM

Quote:

Originally Posted by otto huber

I tested the overboost solenoid today with a mityvac on both ports and neither port held vacuum. I then tried blowing air through the solenoid and was easily able to blow air through the port that receives the banjo bolt line and just barely able to blow air through the port going to the ALDA. Does this sound like the solenoid is bad, or should I check the sensor on the intake manifold? Thanks

Sounds like its stuck in fail mode.

winmutt · #23 02-06-2011, 11:39 PM

Quote:

Originally Posted by Squiggle Dog

Is that the "first muffler" on the exhaust pipe? The only way I could think of making the turbo louder would also cause unfiltered air to come in, which I don't want. I remember the first test drive I did in my 1979 300SD there was no air filter or housing on it (just went down the street and back) and I could hear the turbo loud and clear. I would love it if it was always that loud.

It is the first muffler. Dont drive without atleast some gauze over the intake. I did that with my first euro 3 days after I bought it. From then on it had a bad valve tap. Try taking off the whole exhaust system. It will sound like a cummins straight pipe.

otto huber · #24 02-07-2011, 01:42 AM

Quote:

Originally Posted by winmutt

Sounds like its stuck in fail mode.

Thanks winmutt, so when I go to the junkyard I'm looking for one that holds at least 15hg's of vacuum through either port?

winmutt · #25 02-07-2011, 08:47 AM

The side and bottom port should be a flow through. When in fail mode the top one is vented. When operating normally you want the boost signal from the manifold to go do the ALDA. When in overboost that top opens up and vents to atmosphere which causes the ALDA to go into "limp" mode, or provide the same amount of fuel as it does before the turbo kicks in. Perhaps yours is hooked up incorrectly?

These solenoids can be found on every 123 and newer model in the lot.