chucklesas
Well-known member
Well, I'm super bored here at work and I've been toying with several ideas in my head and felt like starting a discussion on them. Mind you I don't actually plan on doing any of this, just curious to see what pans out of the discussion.
So, when I was chatting with the CinciDSM group about my proposed setup for my car they were quick to tell me that I'd probably run out of fuel with my single Walbro 255LPH in-tank fuel system. That got me wondering what my best options for fuel delivery would be. I can think of 3:
1. Run 1 really big fuel pump. These seem to be quite expensive >$400.
2. Run another pump in series. Good for high pressure, but still doesn't do much for actual fuel flow.
3. Run 2 pumps in parallel. Good for flow, okay for higher pressure, and could be done on the cheap by doing some slight modification to the stock fuel sending unit, although I'd probably go with a pre-made kit like the Full Blown dual pump setup.
Then that got me thinking... with all this extra fuel how am I going to get it to the rail and back to the fuel tank. What size lines are needed? -6AN(3/8â€Â), -8AN(1/2â€Â). 1 feed line or maybe 2 feed lines to either side of the rail with 1 return line coming out the middle? So then would you run 2 -6 feeds with a -8 return? I tried getting into the equations for internal incompressible viscous flow to determine what pipe size would be needed for a set fuel pressure and flow rate, but there were too many constants that I didn't really have a good number for. I might try to get back into figuring this out later, however my brain has gone into atrophy since college.
What about controlling the voltage to the fuel pump(s) like they supposedly do on the Evos? Then we wouldn't have to worry about upgrading fuel return lines. In the case of running dual pumps we could set the system up so that only one of the pumps is running during idle and low load conditions. I think with Keydiver's chip modifications this is something that could be done while avoiding the standalone ECU. Maybe use one of the EGR, BCS, FPR solenoid feeds to run a relay to control the pumps. What kind of effect with this have on fuel pressure control though? Would we need to run 2 seperate fuel systems and 2 different fuel rails with regulators to properly control the fuel pressure for the varying flow rates?
Of course, there's also the consideration for what type of fuel to run: 93 octane, 110 race fuel, E85...
Anyway, again, I just wanted to get these ideas out there and see where they lead to.
So, when I was chatting with the CinciDSM group about my proposed setup for my car they were quick to tell me that I'd probably run out of fuel with my single Walbro 255LPH in-tank fuel system. That got me wondering what my best options for fuel delivery would be. I can think of 3:
1. Run 1 really big fuel pump. These seem to be quite expensive >$400.
2. Run another pump in series. Good for high pressure, but still doesn't do much for actual fuel flow.
3. Run 2 pumps in parallel. Good for flow, okay for higher pressure, and could be done on the cheap by doing some slight modification to the stock fuel sending unit, although I'd probably go with a pre-made kit like the Full Blown dual pump setup.
Then that got me thinking... with all this extra fuel how am I going to get it to the rail and back to the fuel tank. What size lines are needed? -6AN(3/8â€Â), -8AN(1/2â€Â). 1 feed line or maybe 2 feed lines to either side of the rail with 1 return line coming out the middle? So then would you run 2 -6 feeds with a -8 return? I tried getting into the equations for internal incompressible viscous flow to determine what pipe size would be needed for a set fuel pressure and flow rate, but there were too many constants that I didn't really have a good number for. I might try to get back into figuring this out later, however my brain has gone into atrophy since college.
What about controlling the voltage to the fuel pump(s) like they supposedly do on the Evos? Then we wouldn't have to worry about upgrading fuel return lines. In the case of running dual pumps we could set the system up so that only one of the pumps is running during idle and low load conditions. I think with Keydiver's chip modifications this is something that could be done while avoiding the standalone ECU. Maybe use one of the EGR, BCS, FPR solenoid feeds to run a relay to control the pumps. What kind of effect with this have on fuel pressure control though? Would we need to run 2 seperate fuel systems and 2 different fuel rails with regulators to properly control the fuel pressure for the varying flow rates?
Of course, there's also the consideration for what type of fuel to run: 93 octane, 110 race fuel, E85...
Anyway, again, I just wanted to get these ideas out there and see where they lead to.