A larger tank may help but the pump will run longer to "fill the tank" with
vacuum pressure once it reaches down to the switch's cut in point.
I did not see the type of vacuum switch on your EValbum page photo but
appears the tank is in the motor compartment under the hood. If it the
standard Square D pressure switch, there is some adjustability in the cut
in and out pressures but I personally would rather it cut in more often to
maintain the system pressure than to where the vacuum tank/system would be
near empty in case of needing another deep brake depression during cycling.
If the issue is the noise bothering you when it comes on, you may want to
relocate the pump motor or the motor/ tank combination to the trunk or maybe
even under the rear of the car.
The pump noise will be behind you and the noise will travel rearward as you
drive. The extra length of vacuum hose to the power brake booster on the
firewall will also act as additional tank capacity of your existing tank and
you will still have the same amount of hose connections in case you worry
about leakage points.
I did this on my Ranger Truck EV along with putting it in an insulated box
with ventilation and reduced the noise to where you had to actually strain
to hear it. For piece of mind, I installed a LED light indicator on my dash
wired off the pump motor run wiring to indicate when the pump was operating.
Terry Forfa
--------------------------------------------------
From: "EVDL Administrator via EV" <[email protected]>
Sent: Thursday, September 11, 2014 4:31 AM
To: "'Electric Vehicle Discussion List'" <[email protected]>
Subject: Re: [EVDL] Vacuum Switch
On 11 Sep 2014 at 3:32, Buddy Mills via EV wrote:
I am about to put two switches on and use a relay to
accomplish but was wondering if there was a simpler way to keep the
vacuum
pump from cycling so often.
I'd suggest a larger vacuum tank.
David Roden - Akron, Ohio, USA
EVDL Administrator
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