grannyknot Posted August 26, 2016 Share Posted August 26, 2016 The bmw straight six engine I'm installing,http://forums.hybridz.org/topic/122185-m-powered-z/ doesn't lend itself to pulling vacuum from it for the brake booster so I was thinking about installing 12v vacuum pump to supply vacuum. I have never done this before but I know some european manufactures do this all the time. Any advice is welcome, not sure how much vacuum is required by our boosters. Thanks, Chris Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted August 30, 2016 Share Posted August 30, 2016 I found a electric vacuum pump on ebay. Its some type of oem pump for a ford I think. It was about $110. I wired it to a relay which turns on when I apply the brake pedal. Works nicely. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted August 30, 2016 Share Posted August 30, 2016 Maybe you can see it here. Quote Link to comment Share on other sites More sharing options...
grannyknot Posted August 30, 2016 Author Share Posted August 30, 2016 Hey that's pretty clever, so the pump only comes on when the brake is applied? I guess you would hold the brakes down for a few seconds after starting the car so the booster and or vacuum canister was pumped down and ready to go. Thanks Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted August 30, 2016 Share Posted August 30, 2016 Yeah mine only comes on with the brakes applied. It works nicely that way. I've never experienced a hard pedal that way. The booster holds vacuum so there's usually vacuum still on from the last time I drove. You can get fancy and have a canister with a vacuum switch so that it only turns one when vacuum drops. Quote Link to comment Share on other sites More sharing options...
gnosez Posted September 3, 2016 Share Posted September 3, 2016 The rather expensive vacuum pump I had in my street 240 has been moved over to the 240 race car. The street car has just a vacuum canister now while the race car with a CR of 13.7:1 is in need of a bit more vacuum. It is mounted on the battery stand with the relay just above it to the left. Works fine but is loud. How loud? Loud enough to be heard in a completely stripped out interior with twin trumpets, no mufflers, custom ear plugs and a helmet.. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted September 4, 2016 Share Posted September 4, 2016 I can only hear mine if the engine isn't running. Even with the full exhaust. Quote Link to comment Share on other sites More sharing options...
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