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  #16  
Old 03-15-2008, 03:07 PM
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Quote:
Originally Posted by yellowbenz View Post
I agree. It would seem useful for early diagnosis of vacuum related problems and just give info about the operation of your car.
That's why vac. gauges are found on N/A piston powered airplanes. Often they are labeled "manifold pressure."

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  #17  
Old 03-15-2008, 03:11 PM
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Boost gauge from economy gauge....Post #27

http://www.peachparts.com/shopforum/showthread.php?t=62672&highlight=boost+economy+gauge&page=2
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  #18  
Old 03-15-2008, 03:39 PM
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sick mod anyone have a video in action?
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  #19  
Old 03-15-2008, 06:41 PM
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Originally Posted by JimmyL View Post
So you would in fact be monitoring vac to the tranny, but you would at least maybe see the gauge move I guess??

I think that is the point of the economy guage, to remind you you have the pedal down. it drops the vacuum through the VCV the same way the gasser will drop vacuum when its floored
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  #20  
Old 03-15-2008, 06:49 PM
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That economy gauge was extremely annoying in the gasser Benzes. I always felt like a hawk's eye was watching me when I made it into the red. It bothered me to no end.

However, because of this, I never made less than 21 mpg in my 300SE, and I averaged 19 - 20 mpg in my 560SL (that's right; the M117).

But you know, it seems no matter how hard I drive the diesels....Economy doesn't seem to be noticeably altered. I may install them anyway, just for S+G's.
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  #21  
Old 03-16-2008, 01:07 AM
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Quote:
Originally Posted by kerry View Post

In this particular instance, I think the vacuum gauge is a great tool for keeping a permanent diagnostic eye on the vacuum system. You'll know your engine is not going to shut off before it actually doesn't shut off.
Nahh, I generaly notice when my transmission goes from buttery smooth to hard. For example, I was coming home and the damn thing started shifting hard. I started playing with the climate control but nothing. I had left the door lock midway between locked and opened, so it was just leaking out vacuum.
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  #22  
Old 03-16-2008, 01:32 AM
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On our 300D the only things attached to the vac system are the brake booster....the trans modulator....and the shut-off. Thats it.
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  #23  
Old 03-16-2008, 03:06 AM
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Anyone have one of these for sale? I'd love to mod my cluster to have an economy gauge.
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  #24  
Old 03-16-2008, 03:59 AM
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Originally Posted by pawoSD View Post
On our 300D the only things attached to the vac system are the brake booster....the trans modulator....and the shut-off. Thats it.
You must have electric doors?

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  #25  
Old 03-16-2008, 04:02 AM
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Originally Posted by pawoSD View Post
On our 300D the only things attached to the vac system are the brake booster....the trans modulator....and the shut-off. Thats it.
Same on my 300sd! I had dieselkraut hook it up that way after my engine swap. Tranny shifts SMOOOOTH (and climate control)
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  #26  
Old 03-20-2008, 02:37 AM
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I was just taking a look at the vacuum port on the gauge and it looks like a piece of metal is obstructing it. I can't tell if it's supposed to be like that or not, did any of you notice that on your economy gauges?
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  #27  
Old 03-20-2008, 05:21 AM
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Quote:
Originally Posted by H-townbenzoboy View Post
I was just taking a look at the vacuum port on the gauge and it looks like a piece of metal is obstructing it. I can't tell if it's supposed to be like that or not, did any of you notice that on your economy gauges?
Yes, it slows the gauge's response time.
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  #28  
Old 03-20-2008, 01:48 PM
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Originally Posted by lutzTD View Post
I think that is the point of the economy guage, to remind you you have the pedal down. it drops the vacuum through the VCV the same way the gasser will drop vacuum when its floored
It's not the same at all, and you would immediately see this if you drove a gasser with a gauge.

Accelerating with a constant part-throttle on a gasser will start with a very high pressure in the manifold, and the pressure will lower as you increase engine RPM. Without moving the throttle at all. Manifold pressure tells you far more than just pedal position on a gasser.

However, on the diesel, you will be simply reading pedal position and nothing else. I think I know how far I've pushed the pedal.
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  #29  
Old 03-20-2008, 03:17 PM
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Quote:
Originally Posted by Matt L View Post
I think I know how far I've pushed the pedal.
I do too, but sometimes having things moving on the dash just amuses people

I'd do it if I felt better about pulling the cluster in and out constantly, it's already been out two or three times, and everything else on these cars dies when you do that.

My tach hangs up at 1500, it'd be nice to see something else moving to replace it...
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  #30  
Old 03-20-2008, 03:28 PM
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Well, I put the gauge in, teed in at the line running to the transmission from the VCV, started it up, and the needle barely moved. I immediately thought "this means I have a leak at the VCV", a Mity-Vac test confirmed it. I knew my shifts were firm, but I didn't know it was leaking so profusely.

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