windzy

i have an aftermarket boost gauge by VDO and i was wonder if i should get vacum pressure and a stock car. reason i ask is that i saw a video today and the car was getting a lot of vacum.

2bridges

???????????

windzy

http://youtube.com/watch?v=aIoUCi6VGuc

in this video towards the end they show his boost gauge and the needle is goin to the left isnt that vacum or and i wrong?

35thSLP

Most boost gauges (not all) will measure vacuum. The ?????? from 2bridges is because his decoder ring, like mine must be broken. can you restate the question? and well offer up an answer....

windzy

my aftermarket gauge is a lot like the one from the video but mine doesnt go to the left it goes to 0. just curious what cuases it to do that. i dont no if that helps you out.

kevincnc

Is it connected to anything?

35thSLP

If it is connected to the intake manifold and the gauge is designed to display vacuum then either your gauge is not working or it is not hooked up properly.

windzy

thats what im wondering is there a reason it isnt working is something not connected? should i no what the vacum is doing i didnt put it in some i not real sure how it should work.

philcav7

Are you saying that the lowest reading on your gauge is zero or that your gauge will not function in the vacuum readings?

If zero is the lowest digit, you have a boost gauge only.

windzy

it has vacuum on the gauge. i was wondering what others were reading and if it make any difference on the mods done to the car.

35thSLP

The mods on the car and the health of your engine will effect the amount of vacuum you are pulling at a given RPM, as well as other things like leaks. If you don't see any vacuum reading I would suspect a broken gauge if it is indicating boost and the car is idling normally and running ok.

chrly924s

I'm wanting to get a VDO boost gauge for my car. Is there any benefit to having vac on the gauge?

shiners780

For early detection of vac leaks.

chrly924s

Thanks. I have a vac tester, but I see now how that would be beneficial.