How many guys run 2-3 fuel pumps all the same time
01-11-2014, 03:55 AM
#61
9 Second Club
58 is high considering industry standard is usually 45psi or so.
The OEM use a higher base because of their dead end setup in the case of the LS1, and some other dead end rail cars.
No issue at all with that, but given most of the pumps mentioned **** their pants above 70psi, it really makes no sense trying to run them much over 70psi.
So with a base of 58psi, that would be only 12psi with a 1:1 boost referenced setup.
01-11-2014, 01:55 PM
#64
Running one Bosch 044 all the time at 17 volts on a BAP, a Bosch 044 on a pressure switch, and a 255 on a pressure switch. 50lb base and 28lbs boost supporting 950whp though an auto. Going to swap the 255 for another 044. No reason to not switch pumps with pressure. Running them all on is rediculous imo.
01-11-2014, 05:30 PM
#68
So after reading all of this it seems to be a user preference.
The GM PCM will turn the pump on for you. I imagine the aftermarket controllers will turn them on however you like.
I have the Holley 1800 and was thinking I'd let the PCM control one and just out the other on a switch for race days. But just might run both all the time.
Hobbs switch makes sense, but there are enough frickn wires under the hood as it is.
Ron
The GM PCM will turn the pump on for you. I imagine the aftermarket controllers will turn them on however you like.
I have the Holley 1800 and was thinking I'd let the PCM control one and just out the other on a switch for race days. But just might run both all the time.
Hobbs switch makes sense, but there are enough frickn wires under the hood as it is.
Ron
01-11-2014, 09:00 PM
#70
I ran dual 255 with each pump with its own 12-13 volte source. They shared the same signal. I also had each pump with its own feed out the tank to a y block. I ran both pumps all the time in Texas heat and in Georgia It was my only car at the time. I also ran a base pressure of 50 psi at idle. The regulator was boost reference to bump to 60 psi under boost.I also used the stock feed as the return. I ran it like that for 4 years and a **** load of 170 + mph runs in mexico. I only took it apart because im rebuilding my z for 1200hp at the moment. I m going to try dual 340"s on 14 volts. The walbors my do it since I was at 860 hp to the wheels with 96# at 75% dtc with meth.
01-12-2014, 04:58 AM
#71
9 Second Club
Why do you think yours would fail ? Are the pumps not reliable ?
3 pumps all the time probably is overkill, but in that scenario I'd still run all 3 all the time, just add a speed controller to ramp up the pumps with engine demand which will keep fuel flow down and reduce any heat added to the fuel from the hot engine compartment, and also reduce any tiny amount from the pumps themselves.
01-12-2014, 10:34 AM
#72
3 pumps all the time probably is overkill, but in that scenario I'd still run all 3 all the time, just add a speed controller to ramp up the pumps with engine demand which will keep fuel flow down and reduce any heat added to the fuel from the hot engine compartment, and also reduce any tiny amount from the pumps themselves.
Why send more fuel up than is necessary while simply cruising down the highway or sitting in traffic? If you have a street car chances are you're only going to be needing the second pump when merging, hitting the country roads, etc. and there is absolutly zero reason to have more than one pump running until that scenario.
I understand it's all about user preference, but to me it's just dumb to run more than one pump at a time when there's a simple alternative available.
01-12-2014, 12:49 PM
#74
9 Second Club
Are you serious? That sounds more complicated than a Hobbs switch...
Why send more fuel up than is necessary while simply cruising down the highway or sitting in traffic? If you have a street car chances are you're only going to be needing the second pump when merging, hitting the country roads, etc. and there is absolutly zero reason to have more than one pump running until that scenario.
I understand it's all about user preference, but to me it's just dumb to run more than one pump at a time when there's a simple alternative available.
Why send more fuel up than is necessary while simply cruising down the highway or sitting in traffic? If you have a street car chances are you're only going to be needing the second pump when merging, hitting the country roads, etc. and there is absolutly zero reason to have more than one pump running until that scenario.
I understand it's all about user preference, but to me it's just dumb to run more than one pump at a time when there's a simple alternative available.
What's complicated about it ? It couldnt be much easier.
And there is the simplest alternative....run both at the same time lol.
And by your logic...you should be running a speed controller all the time and a dead end system, as you're always sending more fuel to the engine than needed when you use a return system, even with one pump.
01-12-2014, 01:32 PM
#75
What's complicated about it ? It couldnt be much easier.
And there is the simplest alternative....run both at the same time lol.
And by your logic...you should be running a speed controller all the time and a dead end system, as you're always sending more fuel to the engine than needed when you use a return system, even with one pump.
And there is the simplest alternative....run both at the same time lol.
And by your logic...you should be running a speed controller all the time and a dead end system, as you're always sending more fuel to the engine than needed when you use a return system, even with one pump.
Unless their fancy brushless motors
01-12-2014, 01:36 PM
#76
What's complicated about it ? It couldnt be much easier.
And there is the simplest alternative....run both at the same time lol.
And by your logic...you should be running a speed controller all the time and a dead end system, as you're always sending more fuel to the engine than needed when you use a return system, even with one pump.
And there is the simplest alternative....run both at the same time lol.
And by your logic...you should be running a speed controller all the time and a dead end system, as you're always sending more fuel to the engine than needed when you use a return system, even with one pump.
01-12-2014, 04:37 PM
#77
9 Second Club
Aeromotive's new billet controller is one option. Anything that reduces voltage would be a piece of **** and cause problems.
01-13-2014, 10:40 AM
#78
Dumb question for those running pumps all the time. Are you guys running one
on the stock wiring and the second one on its own 12 volt source or both pumps
y ed together on stock wiring?
I have 2 255s in the bucket already but havnt wired it yet along with
a hotwire kit.
on the stock wiring and the second one on its own 12 volt source or both pumps
y ed together on stock wiring?
I have 2 255s in the bucket already but havnt wired it yet along with
a hotwire kit.
01-13-2014, 11:55 AM
#79
9 Second Club
Anything else will need better wiring/connectors. Especially the bigger Walbros, as they draw huge amounts of current.
