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07-18-2012, 10:22 AM
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#1
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Fuel Pressure Trigger
Kinda curious about which method would result in a smoother transition.
A) Hobbs switch on intake pressure, higher boost kicks on second pump
B) Fuel pressure sender on main fuel line, low pressure kicks on second pump
Reasoning behind your pick is prob more important than the pick itself.
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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07-18-2012, 10:23 AM
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#2
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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I think a Calvin switch would be the ultimate.
But based on my limited knowledge, and your two choices, I'd go with the Hobbs switch as the low pressure condition would not have to come in to play in order to get the extra fueling.
JMO.
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07-18-2012, 10:41 AM
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#3
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Well if I never encountered a low fuel pressure situation, why should I kick on the second pump?
Fuel system volume is not changing, so if fuel pressure is constant without dropping, why the need for the second pump to kick on. I assume its to make sure that when you elevate into higher boost levels you are already making the added fuel flow for when the motor guzzles more down.
Assuming thats a correct analysis, I guess the hobbs switch gives you more of a cushion of time for pump to kick on than a fuel pressure switch, which would be as soon as the motor demands more.
But, you are right, a calvin switch is prob the best.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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07-18-2012, 10:42 AM
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#4
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
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You should have a low pressure switch for spark retard or something. I would use the boost activated pump because you could have your main pump fail, it kicks on second pump, you unknowing of this go wot, and you don't have enough fuel. With it only kicking on in boost, you should notice a fuel issue out of boost before it could become an issue.
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07-18-2012, 10:48 AM
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#5
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Quote:
Originally Posted by sweetbmxrider
You should have a low pressure switch for spark retard or something. I would use the boost activated pump because you could have your main pump fail, it kicks on second pump, you unknowing of this go wot, and you don't have enough fuel. With it only kicking on in boost, you should notice a fuel issue out of boost before it could become an issue.
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This seems to contradict itself?
Other option would be a RPM/gear select like a nitrous setup.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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07-18-2012, 11:24 AM
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#6
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
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How? I'm thinking if you run into pump issues like me and the 2ndary pump hides the fact that the main pump is having issues and you don't find out till you go wot.
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07-18-2012, 11:45 AM
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#7
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Oh ok, your saying if the first is dead and I use a fuel pressure switch it will run off the secondary. Gotcha.
Yea, thats always an issue, could wire up a light so when the secondary circuit is kicked on, I get a LED on near fuel pressure gauge.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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07-18-2012, 11:53 AM
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#8
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by LTb1ow
Oh ok, your saying if the first is dead and I use a fuel pressure switch it will run off the secondary. Gotcha.
Yea, thats always an issue, could wire up a light so when the secondary circuit is kicked on, I get a LED on near fuel pressure gauge.
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Yup, I'd say that's a must. Being aware that a pump has failed is a great bit of info to have.
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07-18-2012, 01:02 PM
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#9
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Another option I want to look into is using a stock function in the LS1 pcm, AC or perhaps a MAP option to trigger the second fuel pump relay. Gotta talk to a tuner about that one.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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07-18-2012, 01:05 PM
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#10
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
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Could always get a nice window switch.
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07-18-2012, 01:07 PM
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#11
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Quote:
Originally Posted by sweetbmxrider
Could always get a nice window switch.
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Eh, turbo is not a linear load with RPM like a supercharger so IDK if that would work, IE I could be a real light load but high(er) rpm.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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07-18-2012, 04:31 PM
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#12
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Join Date: Jul 2009
Location: barnegat nj
Posts: 1,340
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hook 2nd pump up to eboost2....problem solved
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Quote:
Originally Posted by SRGN
I never pulled into the staging beams at the track and saw a dyno in the other lane.
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South Jersey Racecraft
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07-18-2012, 04:53 PM
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#13
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Quote:
Originally Posted by S.J.SLEEPER
hook 2nd pump up to eboost2....problem solved
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Not running a eboost, no C02 option
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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07-18-2012, 08:48 PM
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#14
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Join Date: Jul 2009
Location: barnegat nj
Posts: 1,340
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Quote:
Originally Posted by LTb1ow
Not running a eboost, no C02 option
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what are you running for boost control? manual...
__________________
Quote:
Originally Posted by SRGN
I never pulled into the staging beams at the track and saw a dyno in the other lane.
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South Jersey Racecraft
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07-19-2012, 07:41 AM
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#15
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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maybe a boostleash2, not sure yet.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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