vacuum and boost lines advice

[Discopotatoes]

Im trying to declutter my twin turbo engine bay and reduce the amount of pipes hoses and visible leads.
can i have one vacuum/ boost hose to feed multiple items? instead of individual hoses coming from the inlet
i hope that makes sense.

[Discopotatoes]

227bhp said:

No they need to be separate.
Hope that makes sense.

cheers

[Discopotatoes]

GreenV8S said:

AW111 said:

You definitely want to keep the vacuum for the brake booster seperate, and anything else that uses vacuum as a power source * as that may change the effective vacuum seen by sensors.

• I don't know with your car, but mine uses a vaccum diaphragm for the cruise control; some Fords used vacuum for interior vent operation, some cars use vacuum to open bypass valves, etc.

I doubt yours has vacuum operated wipers or pop-up headlights, which was never a good idea .

I agree that large vac-powered actuators such as brake servos need to be connected separately. These have a large enough displacement to alter the line pressure and would cause a false reading if sensors shared the same feed. There are also some older vehicles still using vac operated ignition advance which use ported vacuum rather than straight manifold vacuum and these need to be connected correctly and not just teed into any old vac line.

I'm thinking more of the vac sensing lines such as fuel pressure reference, manifold pressure sensor, vac/boost gauge, recirc valve actuator, vac signal to boost controller, where the amount of air being moved is minimal and I don't see any particular need to provide separate connections.

So I can see that there might be some connections which benefit from being kept separate in some situations, but I don't see the justification for the sweeping reply that everything must be kept separate.

All I have are brake servo, two turbo actuators a map sensor an n75 valve, blow off valve fuel pressure Reg. And a boost gauge

[Discopotatoes]

andygtt said:

Agree with Steve 100%

As an example.
The standard noble has FPR MAP and boost control valve all on one line, brake has its own dedicated as does the boost gauge.

I changed this, now FPR and MAP are one same line (deliberately) from the inlet, boost control valve comes from the turbo itself and I read the boost gauge from the ecu (Ie MAP).

I have a dump valve now (stock car doesn't) and that has its own dedicated feed from the inlet.

Thanks Chaps