Vacuume pump / inlet vacuume question - Engines Forum - Peugeot 306 GTi-6 & Rallye Owners Club

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Subject: Vacuume pump / inlet vacuume question

armzsc6

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Location: Crowborough

Registered: 22 Mar 2008

Posts: 3,445

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Post #1

Some of the vacuume pipes on my supercharged 6 have seen much better days to be honest so I need to replace them. Also at the same time since king supercharged the vacuume pipe that runs from
The inlet manifold to join the vacuume pump pipes is not the best fit to say the least and looks untidy IMO. Is there a reason for both the vacuume pump and the inlet vacuume pipe? Or could I get away with blanking off the inlet one and just running the vac pump?

I read in a thread ages ago about someone else running brembos saying they blanked off the inlet vac pipe and just used the vac pump and the pedal got better.

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Black power baby! SUUUUUPERCHARGED Superman

Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

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Posted 18th Feb 2013 at 00:12

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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

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Post #2

It was put there for a reason so if you remove it then you're going into unknown territory against the knowledge of the Peugeot engineers. Personally, I'd leave it alone but it's up to you. Wink

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love

Posted 18th Feb 2013 at 05:47

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armzsc6

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Location: Crowborough

Registered: 22 Mar 2008

Posts: 3,445

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Post #3

Says you with a 454 bHP 306 lol. Well I think I'll try without it with abung in the back of the inlet and see what happens. Not sure if the one way valve is is the T piece or in the hose connecting the servo to the vac input.... One way to find out lol

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Black power baby! SUUUUUPERCHARGED Superman

Posted 18th Feb 2013 at 08:02

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clen666

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Location: Co. Durham

Registered: 12 Feb 2009

Posts: 2,401

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Post #4

I've wondered what effect charging has on the vac system, as the manifold will be pressurised rather than under vacuum when not on closed throttle.
I know most of the time you will have a closed throttle when braking, but unsure if the positive pressure could be detrimental to the system?

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Team 'unintentional rat look'

Posted 18th Feb 2013 at 13:05

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eliotrw

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Location: Southwark

Registered: 18 Jul 2010

Posts: 4,864

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Post #5

armzs16 wrote:

Says you with a 454 bHP 306 lol.

PMSL

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Ex- Phase 3 China GTi-6 T-Reg

Posted 18th Feb 2013 at 13:24

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fatlapit

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Location: STOCKSFIELD

Registered: 02 Nov 2010

Posts: 3,040

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Post #6

it does nothing lol

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Posted 18th Feb 2013 at 13:31

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armzsc6

Seasoned Pro

Location: Crowborough

Registered: 22 Mar 2008

Posts: 3,445

Status: Offline

Post #7

fatlapit wrote:

it does nothing lol

What does nothing?

And their will be a one way valve in the vac pipes somewhere which stops any positive pressure going to the servo. Which is why even with the engine off you sill have enough servo vacuume to press the pedal about 4 times before it goes hard.

Well once I get the bloody noise my 330mm brembos are making sorted out I'll try messing about with it all and see what happens. Worst would be I get a heavy pedal. I've still managed press the brake pedal hard enough to lock the front wheels being towed in a ca with no engine running before lol.

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Black power baby! SUUUUUPERCHARGED Superman

Posted 18th Feb 2013 at 13:48

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clen666

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Location: Co. Durham

Registered: 12 Feb 2009

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Post #8

Ahhhhh a one-way valve would make sense Doh

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Posted 18th Feb 2013 at 16:31

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bas_306gti

Regular

Location: Eindhoven

Registered: 06 Sep 2012

Posts: 108

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Post #9

these engines produce a weak vacuum that's why the vacuum pump is placed

Posted 18th Feb 2013 at 17:12

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armzsc6

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Location: Crowborough

Registered: 22 Mar 2008

Posts: 3,445

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Post #10

Yet an xsi doesn't have one? I've always thought it odd. When on over-run at Half revs there's s**te loads of vac according to my boost gauge. Will keep the vac pump and ditch the inlet part when I get Hold of some pipes that won't collapse under vac.

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Black power baby! SUUUUUPERCHARGED Superman

Posted 18th Feb 2013 at 17:52

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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

Status: Offline

Post #11

armzs16 wrote:

Says you with a 454 bHP 306 lol.

What's that got to do with it? Dunno

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love

Posted 18th Feb 2013 at 19:22

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