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  #1  
Old 09-25-2006, 01:28 AM
Jeremy5848's Avatar
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Question Where's the boost???

I thought I'd try out my new boost gauge before building it into the car so I ran a temporary line from the intake manifold to the gauge. I fired up the engine in the garage but got no response from the gauge. I revved the engine to 3000 RPM -- surely that would get the turbo to spin, but no, the needle didn't budge. What's wrong?

Here's what I checked:
Gauge and line -- attached it to my air compressor and carefully increased pressure. Gauge works fine, even appears to be accurate.
Manifold port -- removed fitting, stuck screwdriver in port, not blocked by carbon. Attached rubber vacuum line to fitting, tried blowing into port through the line, no blockage sensed.

I haven't tried putting the gauge in the line to the ALDA as it (the line) is old and I don't want to risk breaking it until I have a spare on hand.

Admittedly, my experience with turbocharged cars is slim, but the car runs well and I'm sure my mechanic would have said something when he checked it out in April if the turbo wasn't working. Does the car have to be on the road, with a load on the engine for any appreciable boost to develop? I must be missing something. Please help!

Jeremy

Attached Thumbnails
Where's the boost???-boost_4718.jpg   Where's the boost???-boost_4720.jpg  
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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #2  
Old 09-25-2006, 01:31 AM
ForcedInduction
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The engine needs to be under load to get readable boost.
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  #3  
Old 09-25-2006, 07:58 AM
pawoSD's Avatar
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Yep, you'll probably get no reading just reving it, my car generates about 4psi if I rev to 3500 or so, but I also restricted my boost line....

Take it out for a spin with the gauge and you'll get some readings.
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  #4  
Old 09-25-2006, 08:45 AM
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Quote:
Originally Posted by ForcedInduction View Post
The engine needs to be under load to get readable boost.
Agreed.
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  #5  
Old 09-25-2006, 11:15 AM
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OK, I'll go for a ride this morning and report back. I'm also concerned about the tiny 1/8 inch tubing that connects the manifold to the gauge; I think it will slow the response of the gauge, which is already heavily damped. Fortunately, upgrading to 1/4 inch tubing and fittings will be easy.

Thanks for the guidance. What a great group!
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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #6  
Old 09-25-2006, 11:40 AM
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Quote:
Originally Posted by Jeremy5848 View Post
I think it will slow the response of the gauge, which is already heavily damped.
It won't.
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  #7  
Old 09-25-2006, 03:21 PM
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Where did you get the gauge? (not trying to help, I just want one also)
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  #8  
Old 09-25-2006, 04:12 PM
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Yeah where did you get that one
I got a $18 JC Whitney special that does the job
but I want one of those VDOs with 0-15psi boost press reading only like you got
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  #9  
Old 09-25-2006, 06:53 PM
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The gauge is from egauges.com. Their number 150-101. See this link:

http://www.egauges.com/vdo_mult.asp?Type=Turbo_Boost&Series=Vision&Units=E

The 15 psi "Boost" gauge is $32.50, not including tubing, which is available in several kits or you can roll your own. The input to the gauge is 1.8 male pipe thread which easily connects to either 1/8 or 1/4 inch tubing.

This particular gauge family, the "Vision" series, has really good lighting, something that us old farts with our weak eyes especially appreciate. The Vision series is also a good appearance match for the factory gauges in the W123 cars.
__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #10  
Old 09-26-2006, 04:38 PM
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Here are some initial results for the Boost and EGT gauges. I wasn't able to push the car as much as I wanted -- it's a cool day and the traffic was heavy, but I learned a few things. The photo shows my "installation" -- I didn't want to start drilling holes until I was sure the gauges worked. I'll get pictures of the gauges in operation when the installation is complete.

I fired up the car today and drove into town. The road to town has a 55 MPH limit so I was able to push the pedal pretty hard. The boost got up to 10 psi at 5000 RPM and then dropped back to about 7 or 8, even though I was still accelerating -- I suppose that was the waste gate opening. The EGT gauge got up to about 450F and the water to 80C.

Once in town, I parked and let the engine idle (800 RPM) while I made some notes. There is no boost at idle, of course, and the EGT dropped down to 360F while the water temp remained at 80C, which is where it usually sits in "normal" driving in this car.

On the freeway (70 MPH, level pavement) the Boost is quite low -- only 2 or 3 psi. The EGT stayed at 450 and there was too much traffic to allow heavy throttle up the little bit of hill that is the only high-speed slope in the area. I was able to get the EGT up to 650F (at 70-80 MPH) but even on the upgrade the Boost never climbed above 5 psi. I was surprised it stayed that low -- comments, anyone?

So the gauges work. Now I can build them into the dash. Stay tuned!
Attached Thumbnails
Where's the boost???-gauges_4723.jpg  
__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #11  
Old 09-26-2006, 11:18 PM
ForcedInduction
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450* is quite low. I see between 600-800*f at a steady 60mph highway speed. 900* is common before 35mph during a spirited acceleration from a stoplight. I hit 1400*f before I reach 75mph.

Can you post a picture of where you have your thermocouple installed?
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  #12  
Old 09-27-2006, 12:29 AM
Jeremy5848's Avatar
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Location: Sonoma Wine Country
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Quote:
Originally Posted by ForcedInduction View Post
Can you post a picture of where you have your thermocouple installed?
See the first post in this thread.
__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #13  
Old 09-27-2006, 01:37 AM
ForcedInduction
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Ah. One of those "DUH!" moments.
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  #14  
Old 09-27-2006, 02:55 AM
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Quote:
Originally Posted by Jeremy5848 View Post
The gauge is from egauges.com. Their number 150-101. See this link:

http://www.egauges.com/vdo_mult.asp?Type=Turbo_Boost&Series=Vision&Units=E

The 15 psi "Boost" gauge is $32.50, not including tubing, which is available in several kits or you can roll your own. The input to the gauge is 1.8 male pipe thread which easily connects to either 1/8 or 1/4 inch tubing.

This particular gauge family, the "Vision" series, has really good lighting, something that us old farts with our weak eyes especially appreciate. The Vision series is also a good appearance match for the factory gauges in the W123 cars.
where did you get the egt guage? from same site?

Last edited by Carson357; 09-27-2006 at 03:03 AM.
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  #15  
Old 09-27-2006, 07:04 AM
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Interesting. Lemme know how much boost you get when you are going 70 mph and you give it 1/2 to 3/4 "throttle."

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