Pressure testing again...

[Greg_S]

Been trying to test my car this morning, the first chance ive had to do it and the weather is bareable for a change. Just a bit windy.

Anyway I have put the bungs in and a bung in the breather hose into cam cover and also a bung in the pipe from WGFV to WG but I can get it to hold any pressure at the moment. Im using a 12v compressor at the moment.

Any suggestions? when i first tried it the pressure shot up to 35 psi so stopped and it quickly dropped down to 0 pressure.

Now when i try i cant get any pressure at all


any ideas?

Cheers

Greg

[audiman]

Those little compressors dont have enough displacment for doing pressure testing. Drag the car down to a petrol station and use a normal airline, but if its the set pressure type then set it in 'flat tyre' mode.

[Greg_S]

Ive just taken it down to garage with a proper airline, I dont like those ones where you just set the pressure. cost me 20p which annoys me but ive tested the car and took it to 15psi and it did loose a little but nothing to worry about was probably just thru the wastegate. I was surprised how much the main intake hose swelled up though!.

Greg

[audiman]

Only 15psi ??? I thought you ran close to 2 bar boost?? Crank it up higher than your boost level.

[Greg_S]

yeah will do next time mate. was a bit too cold today and didnt fancy putting too much in with that intake pipe balooning like it did.

Greg

[maRS2]

When the intake pipe go balooning take care after that the metal ring inside is on the good position.
This metal pipe I guess is there to prevent the pipe colapsing under vacum.
It hapened to me and the car felt realy strange much more lag

[Greg_S]

Yeah I will keep an eye on that one, in normal driving I cant see why it would baloon up because it is on the vacuum side, but might do a little on gear change. Am i right in thinking that?

Greg

[blu_s2]

Yeah I will keep an eye on that one, in normal driving I cant see why it would baloon up because it is on the vacuum side, but might do a little on gear change. Am i right in thinking that?

Greg

Yep, only time accordion pipe sees boost is when we test it.

[Lee]

This is why I recommended doing the test at low pressure in my instructions on www.s2-parts.com If it is going to leak it will leak at low pressure...compressors are no good to do these tests. The higher pressure the pump is rated, the worse its suitability: higher pressure needs smaller pistons and hence have less displacement.