Have you mounted in a vacuum/boost gauge? - PeachParts Mercedes-Benz Forum

Silber Adler · #1 10-30-2012, 06:35 PM

I would like to put one in my car. Where would be a good spot?

Diesel911 · #2 10-30-2012, 07:12 PM

Quote:

Originally Posted by Silber Adler

I would like to put one in my car. Where would be a good spot?

To "T" in at the ALDA; you want have to cut any of the Stock Tubing that way.

I don't know about a good place for the Gauge itself.

Silber Adler · #3 10-30-2012, 07:20 PM

Is that the round device near the back of the injection pump, that has a covered adjuster on it and a vacuum line coming out of a banjo?

Now to find an enclosure for the gauge and develop a location for it.

Diesel911 · #4 10-30-2012, 09:37 PM

Quote:

Originally Posted by Silber Adler

Is that the round device near the back of the injection pump, that has a covered adjuster on it and a vacuum line coming out of a banjo?

Now to find an enclosure for the gauge and develop a location for it.

Yes.

Jeremy5848 · #5 10-30-2012, 07:20 PM

See my thread "http://www.peachparts.com/shopforum/diesel-discussion/255906-ashtray-gauges-w124.html." Although this is about the 124, it refers to the 123 in which I had the same gauges, including turbo boost.

Jeremy

Dave Donaldson · #6 10-30-2012, 07:26 PM

Just saw your installation very nice,,, D'oh now I've got a new project. !!!!

Silber Adler · #7 10-30-2012, 07:50 PM

Yes agreed a nice installation. What kind of wood/finish is used in the dashboard.

Jeremy5848 · #8 10-30-2012, 08:16 PM

That is Zebrano, the same wood Mercedes used.

Graham · #9 10-30-2012, 09:55 PM

I bought a boost gauge about 7 years ago. Still on shelf. Car runs well so no drive to get it installed. Especially since there is no good place for the gauge.

I did the ashtray thing on my SL. But that was mainly for the AFR gauge which is useful.

Silber Adler · #10 10-30-2012, 11:55 PM

Graham
How do you use your AFR gauge. Keep it lean for economy?

Quote:

Originally Posted by Graham

I bought a boost gauge about 7 years ago. Still on shelf. Car runs well so no drive to get it installed. Especially since there is no good place for the gauge.

I did the ashtray thing on my SL. But that was mainly for the AFR gauge which is useful.

Graham · #11 10-31-2012, 09:57 AM

Quote:

Originally Posted by Silber Adler

Graham
How do you use your AFR gauge. Keep it lean for economy?

My SL is D-Jet. In order to do any kind of tuning, they need a way of analyzing exhaust for %CO. (AFR can be translated to %CO). That is why I installed it initially. It uses a wide band O2 sensor.

I set it more for performance than economy, but with the gauge it is easy to try different settings for both idle and load mixture (different controls)

Those engines sometimes have a hot start problem. The gauge shows that up clearly - mixture goes way lean after car has been sitting hot for a short while. Enriching idle mixture helps overcome that.

Sorry - probably more than you wanted to know

Silber Adler · #12 10-31-2012, 11:03 AM

I was under the impression that one of the reasons that diesels ran efficiently (besides their high compression ratio) was that they ran very lean air to fuel ratios when cruising. To make more power at a given rpm you put in more fuel.

Quote:

Originally Posted by Graham

My SL is D-Jet. In order to do any kind of tuning, they need a way of analyzing exhaust for %CO. (AFR can be translated to %CO). That is why I installed it initially. It uses a wide band O2 sensor.

I set it more for performance than economy, but with the gauge it is easy to try different settings for both idle and load mixture (different controls)

Those engines sometimes have a hot start problem. The gauge shows that up clearly - mixture goes way lean after car has been sitting hot for a short while. Enriching idle mixture helps overcome that.

Sorry - probably more than you wanted to know

tjts1 · #13 11-06-2012, 05:15 PM

Quote:

Originally Posted by Silber Adler

I was under the impression that one of the reasons that diesels ran efficiently (besides their high compression ratio) was that they ran very lean air to fuel ratios when cruising. To make more power at a given rpm you put in more fuel.

D-jet = gasoline.

tjts1 · #14 10-30-2012, 10:04 PM

I considered doing the ashtray setup (very nice work Jeremy) but I had just swapped in the 92 ash tray from the 190e and its got a much nicer action than the 87 plus its handy for storing quarters. Instead I drilled a 1.5" hole in the switch panel where it had 2 blank spots and installed a 15psi fuel pressure gauge ($8 ebay) to act as a boost gauge. Works beautifully. The only down side is that it tends to vibrate and make a buzzing sound. The solution was to add a cheap fuel filter in line with the hose which dampens the vibrations for the most part. I still get a slight buzz from the gauge at 12psi which is handy at night since the gauge is not lit.
http://i.imgur.com/aqZkg.jpg

Silber Adler · #15 10-30-2012, 10:37 PM

I had done some research and noticed that there were some inexpensive pressure gauges and thought why not.

I like the mounting location of yours, more in the line of sight.

Quote:

Originally Posted by tjts1

I considered doing the ashtray setup (very nice work Jeremy) but I had just swapped in the 92 ash tray from the 190e and its got a much nicer action than the 87 plus its handy for storing quarters. Instead I drilled a 1.5" hole in the switch panel where it had 2 blank spots and installed a 15psi fuel pressure gauge ($8 ebay) to act as a boost gauge. Works beautifully. The only down side is that it tends to vibrate and make a buzzing sound. The solution was to add a cheap fuel filter in line with the hose which dampens the vibrations for the most part. I still get a slight buzz from the gauge at 12psi which is handy at night since the gauge is not lit.
http://i.imgur.com/aqZkg.jpg