ECS Boosta a pump Hob switch question.
Thread Starter
Burning Brakes
Joined: Aug 2014
Posts: 1,019
Likes: 30
From: Mentor Ohio
ECS Boosta a pump Hob switch question.
I have another question....LOL
I know I ask a lot but as they say, measure twice and cut once.
As I'm installing the Alky kit I figured Id check over everything.
In testing the hobbs switch on the ECS Boosta a pump I have a question. When I installed it I did add the racetronix wire upgrade.
So when checking the switch I find that it is a normally closed switch. So the connection is allowed to pass to ground until the switch reaches 4lbs.
Is this correct? I was under the impression that when 4PSI was reached it would close the switch and allow the circuit to become complete but it seems to disconnect the circuit instead. I checked it with a volt meter and it is closed until it reaches 4lbs....
I did not disconnect the switch from the system and test it. It is still wired up. I just put a jumper from each leg to the volt meter.
I know I ask a lot but as they say, measure twice and cut once.
As I'm installing the Alky kit I figured Id check over everything.
In testing the hobbs switch on the ECS Boosta a pump I have a question. When I installed it I did add the racetronix wire upgrade.
So when checking the switch I find that it is a normally closed switch. So the connection is allowed to pass to ground until the switch reaches 4lbs.
Is this correct? I was under the impression that when 4PSI was reached it would close the switch and allow the circuit to become complete but it seems to disconnect the circuit instead. I checked it with a volt meter and it is closed until it reaches 4lbs....
I did not disconnect the switch from the system and test it. It is still wired up. I just put a jumper from each leg to the volt meter.
Last edited by GeneSch; Jul 22, 2015 at 10:13 PM.
Race Director
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From: Raleigh, NC
St. Jude Donor '15
I had always thought the same.. so I'm a bit confused if it's backwards from that. But I know electronics can do some weird things sometimes so I would try testing it totally disconnected and see what happens.
Thread Starter
Burning Brakes
Joined: Aug 2014
Posts: 1,019
Likes: 30
From: Mentor Ohio
Premium Supporting Vendor
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From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
That is correct, the Hobbs switch opens the circuit during boost.
Which is opposite of our fuel system Hobbs switch just so that is clear.
The thinking when that voltage booster was designed is that if a ground failed it would increase the voltage all the time, which is better then going lean and possibly hurting the engine if it didn't turn on at all anymore.
If you were to by pass the hobbs and short it right to ground the booster will do nothing, leave it off it should boost the voltage all the time to 17.4v then. Which is the value we figured out to give a nice boost to the pump without burning it out.
Other brand BAP's can increase voltage to 21+ volts which will burn the pump out quickly, hence part of the reason why BAP's kind of have a bad reputation.
I hope that helps!
Which is opposite of our fuel system Hobbs switch just so that is clear.
The thinking when that voltage booster was designed is that if a ground failed it would increase the voltage all the time, which is better then going lean and possibly hurting the engine if it didn't turn on at all anymore.
If you were to by pass the hobbs and short it right to ground the booster will do nothing, leave it off it should boost the voltage all the time to 17.4v then. Which is the value we figured out to give a nice boost to the pump without burning it out.
Other brand BAP's can increase voltage to 21+ volts which will burn the pump out quickly, hence part of the reason why BAP's kind of have a bad reputation.
I hope that helps!
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C5/C6 and C7 Supercharging Specialist
ECS Supercharger Kits / Mantic Clutches
www.EastCoastSupercharging.com
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ECS YouTube Channel
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