help with psi boost gauge

[Oz2]

ok not sure if i`m being a bit of a numpty.....but!
as i`m running a supercharger I would like to know the boost i`m getting, now what better way than with a boost gauge.
Now I used the centre blank plug on the drivers side (below the join) and modified it to take the fitting.....
I know the boost gauge works I can blow 1 1/2 psivia the line when disconnected from the plenum.
But if i run the car its reading zero boost.......why? am i missing something?

I have photos but thumbsnaps not working, thats another thread!

Cheers

Capt. confused

[mrzigazaga]

Hi Mate..I found this on boost gauges, Hope it helps..Cheers..Ziga

You might have to download it as its a PDF

http://www.google.co.uk/url?sa=t&rct=j&q=U...

[chedder]

When you run the engine on tickover, the boost gauge will only show vacuum, to show boost you have to give it a good reving (preferably under load)

Chedder

[adam quantrill]

It's worse than this Tony!

1. When running anything less than 90% WOT you will get significant vacuum so < atmospheric.
2. This applies at any RPM.
3. How did you join the pipe to the middle port on the plenum - did you use a brake vacuum screw-in thingy? If so:

I found that the brake port adapters also have a one-way valve in them. To defeat this get a really stout piece of wire (I used a massive staple off a cardboard box) and stick it into the hole to jam open the valve, then bend the end over so it's trapped by the pipe and jubilee clip (you WILL need a jubilee clip to stop the pipe popping off under full boost).

Stomp on full throttle and you should see 6psi boost.

[Oz2]

Ok I'll try it out tomorrow.
I will try to post the pics of how I've done it tonight, if I can get it to work.

[Oz2]

http://thumbsnap.com/i/ODIXzoN4.jpg
http://thumbsnap.com/i/97gfsj06.jpg
http://thumbsnap.com/i/JyRcpYh1.jpg
http://thumbsnap.com/i/MhPK9z5n.jpg

best i can do thumbsnap not working for me!!
Adam

Edited by Oz2 on Thursday 10th May 13:14

Edited by Oz2 on Thursday 10th May 13:16

[adam quantrill]

So teh tap off the centr hole looks like a bespoke thing, presumably with no valve inside, looks like all you need to do is floor it!

[Oz2]

adam quantrill said:

So teh tap off the centr hole looks like a bespoke thing, presumably with no valve inside, looks like all you need to do is floor it!

Will do, at the earliest opportunity.
Cheers

[Oz2]

IT WORKS
I think i`m only getting 5psi though, maybe because it a 350 not 400? i don`t see why that should make a difference........
However as soon as you stomp on it, its straight up to 5psi then it creeps up a bit more perhaps if i hold it, it will reach 6psi?????
Either way it a fantastic sound...

(and that`s with the cool air induction on so it`s not restricting it)

Cheers Adam