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PeachParts Mercedes-Benz Forum (http://www.peachparts.com/shopforum/)
-   Diesel Discussion (http://www.peachparts.com/shopforum/diesel-discussion/)
-   -   Have you mounted in a vacuum/boost gauge? (http://www.peachparts.com/shopforum/diesel-discussion/328571-have-you-mounted-vacuum-boost-gauge.html)

Graham 10-31-2012 11:01 AM
These units are kind of pricey but would be easier to find a place for:

http://www.dynotunenitrous.com/store...uare-large.JPG

square boost pressure Gauge, velcro anywhere, size of a keychain remote. Digital boost pressure gauges in a square package will read boost pressure in PSI. Turbocharger boost gauges in a square package. - Square boost pressure gauge, velcro anywhere,

Maybe there is cheap Chinese version ;)

By the way - the fuel pressure gauge on my SL could be used as a boost gauge, esp if one with a smaller range could be bought. It has an electronic transducer so that only wires have to be brought into cabin. A must with gasoline!

scottmcphee 10-31-2012 11:21 AM
Stuck a digital read-out one up near the mirror, roof mount. It's lies flat between the mirror and roof. Where you'd imagine a radar detector going.

Not the one in the previous post,

this one:
http://www.auberins.com/index.php?main_page=index&cPath=5

I like it because it has a bright blue LED alarm that shows for over-pressure. Since I removed all the overboost protection vacuum crap from the engine, and I've added a manual wastegate controller that can dial up boost to my pleasure. It's nice to know when I hit more than one bar boost, and dial it back a bit... because this engine with the stock IP can never use more boost than that!

Silber Adler 10-31-2012 12:03 PM
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 (Post 3039779)
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 10-31-2012 12:07 PM
I don't know about a digital unit. I don't mind a digital display for time but for something that can change fast I think that mechanical and analog will be the way I will go. I want it to be illuminated and fairly small and cheap. I have seen some on ebay.

Silber Adler 11-06-2012 06:07 PM
I bought one on ebay.

tjts1 11-06-2012 06:15 PM
Quote:
Originally Posted by Silber Adler (Post 3039835)
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.


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