Ford Mermaid Turbo 4 / Pacific 22

[beamishken]

Seeing a vacuum in the manifold isn't as daft as it sounds.
A none turbo naturally aspirated engine would see a vacuum in the manifold as the cylinders pulled the induction air in,
If your turbo isn't working and the engine requires more air than the turbo can provide then it is possible to see a vacuum in the manifold
That said I'd expect performance to be down further than your experiencing
Let's wait and see what a new gauge with the correct range has to say

[Atlantis.diver]

Originally Posted by beamishken

Seeing a vacuum in the manifold isn't as daft as it sounds.
A none turbo naturally aspirated engine would see a vacuum in the manifold as the cylinders pulled the induction air in,
If your turbo isn't working and the engine requires more air than the turbo can provide then it is possible to see a vacuum in the manifold
That said I'd expect performance to be down further than your experiencing
Let's wait and see what a new gauge with the correct range has to say

Yes I understand that, only when I take the hose off the intercooler and physically plug with my hand and engine running flat out the pressure is to strong for me to create a seal, but when I take the boost gauge valve off the manifold and and run same rpm I can plug hole very easy.

Will try and take pics of what I'm doing, will keep you posted 😀

[yam man]

You always get negative pressure on turbo engine before the turbo boost .

As beamishken said something isn't right if it's constant negative pressure sounds the like turbo isn't boosting.

Is it exhaust clean out the back ie no black

[beamishken]

Plugging the turbo outlet and testing the manifold pressure under load are two entirely different things
The turbo needs to give pressure but also enough volume to maintain that pressure

[Atlantis.diver]

Brilliant info, I understand that it will give negative pressure but on WOT it should be a positive but not much. Iv bought a small gauge off eBay and will confirm the manifold pressure. And take it from there.

[GuyC]

Being the proud owner of a Pac 22 with a Turbo 4, I didn't see any issue with putting more gunge on the manifold.

[Atlantis.diver]

Well I think I found out the problem was, the jubilee clip on the silicon hose off the turbo charger was not holding on very well as there seemed to have a worn thread on it, so when I had a friend drive and I inspected the engine bay, I notice the jubilee clip was opening with the boost from the turbo and was escaping only getting 4psi now I'm getting about 12/13psi on the gauge. Got there in the end guys. Thanks for everything