Turbo boost guage advice needed
 

I'm gonna buy a boost guage but have come across some that have a range I'm not familiar with.

Some of these offer a range where the needle goes from X in Hg to 0 to X PSI.

Would having this 'dual' range type guage be of ANY benefit to me?

I figured on just getting a 0-15 PSI guage and being done with it.

The part of the range labeled inches of Hg is the vacuum part of the gauge. It could be used with a switching valve to check vacuum points. Probably intended for a gasser originally.

I'd go with the cheapest 0-30psi pressure gage you can find. If you know of anyone who works with pneumatic controls they would have plenty. All you need is a 1/4" barbed fitting and some 1/4" poly tubing. Standard stuff in the world of pneumatic controls. I'd say 0-15 psi is ok also. You probably won't see any boost pressures on your benz over 10psi or so if its original. The combination gage of Inches of Mercury and Pressure in psi is perfectly fine also. We're not building a watch, just checking turbo boost pressures here.

Actually, I think the vacuum reading can be used to determine how clean the air filter is...like, if you're seeing very much of a vacuum at idle, that means the engine's working harder to pull air in. Just a thought...

Also, where are you planning to mount this? I would like to put in a boost gauge along with a pyrometer, but I don't knwo where to locate the gauges where they would fit in with the rest of the interior...?

I'm *wanting* to mount it in the ashtray. Anywhere where it would be seen, it would look out of place I think.

The idea of seeing vacuum levels while the turbo is not producing boost is an interesting thought.

I wouls suggest that you try and get a scale that would allow you to see it in a glance. If the range is to high you would need to focus on it to know the boost level.

I wonder if anyone make a digital unit (3/4" by 1 1/2") , that way it would be clean no matter where you put it.

Hey, how does this gauge look? That's from Isspro...I can't rememebr exactly what the max boost is on these engines...

Here's what I installed:
16.99 boost gauge!
Also, why T? There are additional ports in the intake manifold into which the boost gauge line can be tapped.

I would buy a gauge without the vacuum section and the smallest psi range possible, a 0-15psi would be perfect as these engines shouldn't be over 14psi anyway. A 0-30+psi gauge or one that has a vacuum scale on it reduces its readability and adds nothing for our application. Check this gauge out: http://www.dieselpage.com/iss14.htm
or this: http://www.dieselpage.com/issev2.htm
For digital, check out: http://www.speedshop.org/store/Scripts/prodView.asp?idproduct=20

Have fun! RT

Check out egauges.com, they have a pretty impressive selection of VDO gauges that are suprisilngly inexpensive. I will be adding a 15 psi boost gauge to my 123 as soon as I get time. Haven't decided on a mounting place yet. I will post pics as soon as it is completed.

jhal: Jep...already been looking at egauges.
Let me know if you think of any good places to put the gauge. I plan on *trying* to fit it into the ash tray.

I did put mine ( voltmeter and boost ) on the pilar pod and it looks very sportiv
I whant to post picture but i do not now how to on this site , please somebody can teach me step by step?
thanks

Just attach a file. It's above the submit button. On the page where you type your message.

0.5 bar
 

my booste Gage is in Bar. It was installed in Germany. Turbo sits at about 0.5 bar which works out to 7.252 psi. How is this for a 617A, about right, good, performance setting, low setting?

I hope this picture help
My boost shows at 4000RPM 10psi and i will whant to change to 13psi
My question to you guys is "do i have to alter ALDA to, when i will reach 13PSI OR NOT?