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  1. #1
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    Default Who uses a vac pump to help with brake vacumn

    Hi
    Would like to install in HQ . What are peoples experiences ???

  2. #2
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    WP_20160624_17_31_41_Pro.jpgWP_20160624_17_32_11_Pro.jpg

    Yup, Hella Vac pump as used on plenty of Euro cars, separate Vacuum switch to turn on and off the pump and a Jap car vehicle check valve.

    Works like a dream, like driving a new car, after driving the Hatchback for the last 25 years with little to no engine vacuum due to big cams, typically 4"Hg at idle and only 10"Hg at cruse...

  3. #3
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    Yep, works a treat.

    I use a Hella vac pump with a reservoir. The vac switch is fitted to the reservoir.

  4. #4
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    hi
    Hella new or used ,where from ,idea on cost ???

    Mick how much vacumn does it produce any idea???
    Mick
    2 hoses going to booster check valve ,what are they??
    Do u use existing manifold vaumn as well or rely on Hella unit by itself ??

    Be great if u could answer above ,cheers

    Anybody else

  5. #5
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    HI all
    Found ebay around 220$
    See they are fitted to commodores VE etc
    Hella unit capable of only around 13-15 in` vac ,, enough to operate brakes but other diaphragm and vane pumps can pump to 20 inches of vac I noticed .

    Probably will T into booster line from manifold . Will then need inline check valve on the engine side .

    Having trouble finding pressure switch to suit ,,any ideas ??


    Any idea how the commodores have theres wired in ??
    Last edited by swampy; 06-08-2018 at 09:37 PM.

  6. #6
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    Hella pump is a UP-28

    No engine vacuum used at all. The large hose is for the vacuum and check valve, and small hose is direct to the brake booster to monitor what vacuum is in the booster and connected to the vacuum switch.

    Pump is capable of roughly 20", and I think I have it set to switch off at about 18.5"Hg and it comes on after it looses roughly 2"Hg.

    My booster is a double diaphragm and there is no need for extra storage tanks.

    No point in connecting it to the engine if the engine isn't making enough vacuum in the first place as it will never add to the amount of vacuum provided by the pump.

    Vacuum switch, PSF109S-81-330 - MULTICOMP - Pressure Switch, Vacuum, 1/4" Axial Port

    It is adjustable via a grub screw and an allen key down inside the vacuum nipple.

  7. #7
    Not the Kingswood! hq308's Avatar
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    Quote Originally Posted by Mick_in_oz View Post
    No point in connecting it to the engine if the engine isn't making enough vacuum in the first place as it will never add to the amount of vacuum provided by the pump.
    I have to respectively disagree with this, at anything above idle (and less then wot) most petrol engines will provide plenty of vacuum. That's why some people just use a vacuum tank instead of a pump, during normal driving there is sufficient vacuum built up in the booster and the tank for a couple of good stops. The issue for most people is a lack of idle vacuum.

    The aftermarket pumps I've looked at have a hose from the engine going to the pump and then from the pump to the booster. At least if the pump fails for any reason you still have some vacuum from the engine.

  8. #8
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    There are a number of ways to do this. Some pumps are designed to offer assistance to the engine provided vacuum, and others as a stand alone unit.

    Depending on how much vacuum the engine produces, yes there may be a benefit in connecting to the engine also, BUT, if it has a big cam and heads its a waste of time!

    For well over 20 years my car has never seen 18"Hg on a vac gauge, idle at 4"Hg, cruise at 9-10"hg, 11.5"Hg at 100Km/hr, and even snapping the throttle shut at speed wouldn't see it get to 16"Hg.

    So, as much as there might be situations where the engine may help out, like I said, if the engine doesn't produce more vac than the vac pump, its not a benefit and can't help out, I do feel the way I worded that line, it still stands.

    So, maybe some feedback from the person starting the thread to see what their engine produces and that may shed additional light on their particular situation as to what might be most suitable.

  9. #9
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    Hella new or used ,where from ,idea on cost ???
    - I purchased mine off ebay - think it was under $200. I noticed the other day that there is one (Hella UP28) under the bonnet of my wifes 6 cyl VE Commo

    H
    ow much vacumn does it produce any idea???
    - Not sure - I have my switch turn it off at 18gh

    2 hoses going to booster check valve ,what are they??
    - I have it set up with the vac pump pulling vac from the vac tank, which is connected to the main booster

    Do u use existing manifold vaumn as well or rely on Hella unit by itself ??
    - I do with mine - didnt at first until the relay shat itself . . . not the vac line to the booster has a T piece and check valve that pulls vac from the manifold (free vac from the manifold when I am driving down hills and cruising at part throttle)


  10. #10
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    Quote Originally Posted by Mick_in_oz View Post
    There are a number of ways to do this. Some pumps are designed to offer assistance to the engine provided vacuum, and others as a stand alone unit.

    Depending on how much vacuum the engine produces, yes there may be a benefit in connecting to the engine also, BUT, if it has a big cam and heads its a waste of time!

    For well over 20 years my car has never seen 18"Hg on a vac gauge, idle at 4"Hg, cruise at 9-10"hg, 11.5"Hg at 100Km/hr, and even snapping the throttle shut at speed wouldn't see it get to 16"Hg.

    So, as much as there might be situations where the engine may help out, like I said, if the engine doesn't produce more vac than the vac pump, its not a benefit and can't help out, I do feel the way I worded that line, it still stands.

    So, maybe some feedback from the person starting the thread to see what their engine produces and that may shed additional light on their particular situation as to what might be most suitable.
    Mick - my engine produces F all vac . . . but when I was relying on the elec vac pump only and the relay shat itself (and I almost ran up the ass of a HQ Monaro on a cruise), I decided the lesser amount of vac provided by the manifold was better than no vac at all (in the event the pump or relay shat itself). So now I use both - elec vac and manifold vac.

  11. #11
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    Bill, I know the feeling, that's why I went the vac pump rout, mine really only ever had half of one very poor application and if you had a half go at the brakes and then coasted a lil and then went again it had no assist, I hated it but was used to it.

    The reason I went with the Hella pump was due to it being a factory fitment item that I considered to be of much greater quality and designed to do perhaps 250,000Km without a failure, so my few thousand a year shouldn't have been an issue.

    Faulty pump or relay etc is moot if the diaphragm in the booster fails, as has happened to me in the past, no matter how many times you try to cover all possibilities there is always another area that can fail.

    How is the vac pump configured on a VE commodore? Its a similar pump from memory.

  12. #12
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    Hi all
    Yes I have found different ways to plumb this
    1 stand alone pump and booster
    2 T piece into original booster line

    Max vacumn was from u tube ,there are many examples of only pulling 15 vac

    Operating from brake pedal alone is a flawed idea BUT has merit
    Combine above with time delay relay say 1min [reduce cycling ] with operation by vacuum switch

    Parts I require
    vacuum switch above unit ok---- Thanks Mick in oz
    ---- 3/8 one way valve that holds 20 inch vac any ideas anyone ………………………………..

    Although I have run the vehicle b4 with holden v8 and camshaft upgrading to chev with anticipated low vac as well
    Situation is I run vacuum dash controls and of course double diaphragm booster 4W disc .
    Cannot stand when driving with the air con doing what it likes ,,,,,Ha Ha Ha

    yea I have a check valve in the dash controls [no canister] but would like to ensure I have great brake assist also .

    The holden v8 setup only just enough 80% time ,fair in reality but not great .



    HI MIck
    Is the on set point adjustable Assuming yes
    Is the vac rise [hysterises] amount adjustable also ??
    I am Assuming the vacuum rise is fixed and the set low point for ON is adjustable
    Wired of course to trigger on the rising or falling vacuum etc
    Last edited by swampy; 07-08-2018 at 04:11 PM.

  13. #13
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    Never used one.

    If the time comes that I build something that won't run factory booster with anything more than a reservoir, I'll probably do away with the booster altogether.

    Your driving style may vary.

  14. #14
    Do you ever leave? EH179's Avatar
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    I'm not into luxuries, so i drive accordingly.

  15. #15
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    I may look at a vacuum pump, or not. Till then, with low vacuum, the pedal is nice and firm. Getting off the seat and putting some hoof into it works. As above, race cars don't have boosters. I may also look to do away with it altogether and just get the right master cylinder for the job and also drive accordingly.

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