Which hose to cut for vacuum gauge in N/A
 

Hi All

Planning on plumbing some gauges into my GL tomorrow, one of which is vacuum pressure which will look a bit like a boost gauge and make me feel less inadequate for being turboless ;)

Can anyone tell me if I've highlighted the right hose to put a T-piece into? The engine is a UK MY95 1.6GL.

http://members.lycos.co.uk/subaru/scoobynet/Vacuum.jpg

Cheers,

Ben :)

My gauge installation has been delayed as my oil temp sender is faulty. Could still do with knowing which hose to cut for my vacuum gauge if anyone knows..?
:)

Fitted a boost gauge to my Turbo and used the same pipe as you have highlighted. Try and join it to the manifold first with a very short piece of pipe and T piece then add the original pipe onto other side of the T adaptor. ( this way you can always remove it later ) An initial check would be to disconnect the pipe when the engine is running and check it is drawing in air.

Cheers for the reply, I'll give that a shot. Good plan re using a new bit of short pipe, simple idea but I hadn't thought of it! :)

Well I went ahead and used the hose shown above, but the vacuum gauge is not behaving as I expected. I believe the gauge is meant to hold a position of around 17in.Hg at idle, which increases with applied throttle, or goes below 17 on over-run. What that gauge is actually doing, is holding just above 0in.Hg at idle, increasing up to around 10in.Hg with increasing applied throttle, but then snapping back to 0 at around half throttle, it stays at 0 up to WOT. However, if the car is in neutral the gauge does not snap down to 0 under heavy throttle and will continue to show an increase in vacuum proportional to the throttle applied.

Have I gone into the wrong hose? Fortunately I used a short bit of hose to the T piece as suggested above, so the original hose hasn't been cut. There is a different hose lower down than the one I highlighted above, I can't remember it any more specifically than that so will have to have a look in daylight. Anyone have any suggestions as to what's wrong in the mean time though?

Cheers,

Ben