Forced Induction Superchargers | Turbochargers | Intercoolers

Real quick hobbs switch question

Thread Tools
 
Search this Thread
 
Old Dec 26, 2009 | 01:34 PM
  #1  
bottlefed370's Avatar
Thread Starter
On The Tree
iTrader: (2)
 
Joined: Nov 2008
Posts: 116
Likes: 0
Default Real quick hobbs switch question

I have searched but couldnt find the answer i was looking for so i just thought someone could answer this for me real quick. What exactly does a hobbs switch do? From what ive read sounds like when running 2 fuel pumps, as soon as you roll into the throttle the switch (at the psi you have it set at) will kick the other pump on? Now i have a fuel pressure safety switch, is this the same thing? Damn i feel like a newbie asking questions like this.

thanks

josh
Reply
Old Dec 26, 2009 | 01:44 PM
  #2  
XtremeDime's Avatar
TECH Addict
iTrader: (16)
 
Joined: Jul 2005
Posts: 2,899
Likes: 0
From: Anchorage, ALASKA
Default

As far as I know you put the hobbs switch on the charge pipe so when you go over x amount of psi(of boost) it will trigger the second pump just like a relay does.
Reply
Old Dec 26, 2009 | 05:48 PM
  #3  
jomomma's Avatar
12 Second Club
iTrader: (39)
 
Joined: Jun 2006
Posts: 943
Likes: 0
From: surry, va
Default

a hobbs switch uses a vacuum reference. they arent the same. the hobbs switch i have is adjustable from2-5psi to switch on. a fuel safety switch cant see boost
Reply
Old Dec 27, 2009 | 02:07 PM
  #4  
black98ws6ta's Avatar
TECH Addict
iTrader: (77)
 
Joined: May 2002
Posts: 2,107
Likes: 2
From: louisville,ky
Default

Originally Posted by jomomma
a hobbs switch uses a vacuum reference. they arent the same. the hobbs switch i have is adjustable from2-5psi to switch on. a fuel safety switch cant see boost

A fuel safety switch does see boost(fuel pressure). Both a hobbs switch and fuel pressure safety switch work the same way. They come either normally open or normally closed. When they reach the set amount of pressure they switch and do the opposite.
Reply
Old Dec 27, 2009 | 02:13 PM
  #5  
bottlefed370's Avatar
Thread Starter
On The Tree
iTrader: (2)
 
Joined: Nov 2008
Posts: 116
Likes: 0
Default

Ok that makes more sense. So lets say for example i set my switch to 1psi, this will kick the other pump on as soon as it see's that amount of boost? I read somewere about a different kind of switch that allowed use for boost controller, and some other goodies? Does it matter where on the charge pipe its mounted at, pics would be nice also.
Reply
Old Dec 27, 2009 | 03:41 PM
  #6  
black98ws6ta's Avatar
TECH Addict
iTrader: (77)
 
Joined: May 2002
Posts: 2,107
Likes: 2
From: louisville,ky
Default

Originally Posted by bottlefed370
Ok that makes more sense. So lets say for example i set my switch to 1psi, this will kick the other pump on as soon as it see's that amount of boost? I read somewere about a different kind of switch that allowed use for boost controller, and some other goodies? Does it matter where on the charge pipe its mounted at, pics would be nice also.
Yes it will either open or close the contacts of the switch at the set amount. It does not matter where you put it just as long as it will see the pressure.
Reply




All times are GMT -5. The time now is 01:58 PM.

story-0
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-04 18:13:20


VIEW MORE
story-1
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-2
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-3
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-4
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-5
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-6
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-7
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-8
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-9
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE