LMR 440 TT/ 4L80 Build
08-11-2009, 01:45 PM
#143
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So you are using the stock rear tanks and this tank? Or just the front tank? The 750 Magnafuel is a beast. That what we have in TJ's 1000 hp GTO.
08-11-2009, 02:08 PM
#144
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We have twin 255's in factory tank, they werent enough. So now they feed the surge tank and the magnafuel feeds the motor. I have never seen it before, but I think its a pretty cool concept.
08-11-2009, 06:38 PM
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I am not totally sure what the **** I am looking at with the vetical tank, but the setup looks cool. Is that an inline tank from the rear tank? Looks like 3-4 gallons........?
08-11-2009, 06:56 PM
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Its a surge tank set up. The intank pumps cant keep up with the motor at full throttle, so now they feed the stainless tank you see which supplies fuel to the magnafuel pump and then to the motor.
08-11-2009, 10:25 PM
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I am no fuel system expert, so this is maybe a silly question. But if the tank pumps cant keep up, does the shortened distance the the post tank effectively increase their efficientcy, or can the 750 magnafuel suck the stainless tank dry (in theory) if you were WOT and max fuel delivery long enough?
08-12-2009, 12:01 AM
#153
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I am no fuel system expert, so this is maybe a silly question. But if the tank pumps cant keep up, does the shortened distance the the post tank effectively increase their efficientcy, or can the 750 magnafuel suck the stainless tank dry (in theory) if you were WOT and max fuel delivery long enough?
If everything like exact fuel usage at WOT and flow of pumps were constant and known it could be figured out exactly how long the car could be run at WOT. It is in a way like an accumulator in a hydraulic circuit, the extra volume is there when more than the pumps can provide is needed. It just comes down to calculating how much volume is going to be needed and for how long in order to determine tank and pump sizes......
08-12-2009, 09:17 AM
#156
I am no fuel system expert, so this is maybe a silly question. But if the tank pumps cant keep up, does the shortened distance the the post tank effectively increase their efficientcy, or can the 750 magnafuel suck the stainless tank dry (in theory) if you were WOT and max fuel delivery long enough?
After the surge tank, the Magnafuel pump will take suction off of the tank and pump the flow back up to 60psi+. It may suck the tank down to 10-15psi, but it doesn't matter because it's shoving it into the rails with a pressure regulator directly downstream which can be set to whatever you want.
So, all the walbros have to do is maintain the flow to the surge tank, not the pressure. Making 60psi eats up most of the pumps' power, so they can provide plenty of flow at a low head pressure. This system would run out of fuel when the MAIN tank went dry.
Great design guys.
08-12-2009, 09:47 AM
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08-12-2009, 11:47 AM
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Pressure is a result of a restriction in flow. If the twins could sustain enough flow/volume there would be no rail pressre drop or need for a surge tank/pump unless you just wanted to be safe.
The twin Walbros will pump fuel to the surge tank. They may not be able to supply enough fuel at 60psi+ boost reference, but they can probably supply 2x the fuel if the surge tank pressure can drop to whatever you need.
After the surge tank, the Magnafuel pump will take suction off of the tank and pump the flow back up to 60psi+. It may suck the tank down to 10-15psi, but it doesn't matter because it's shoving it into the rails with a pressure regulator directly downstream which can be set to whatever you want.
So, all the walbros have to do is maintain the flow to the surge tank, not the pressure. Making 60psi eats up most of the pumps' power, so they can provide plenty of flow at a low head pressure. This system would run out of fuel when the MAIN tank went dry.
Great design guys.
After the surge tank, the Magnafuel pump will take suction off of the tank and pump the flow back up to 60psi+. It may suck the tank down to 10-15psi, but it doesn't matter because it's shoving it into the rails with a pressure regulator directly downstream which can be set to whatever you want.
So, all the walbros have to do is maintain the flow to the surge tank, not the pressure. Making 60psi eats up most of the pumps' power, so they can provide plenty of flow at a low head pressure. This system would run out of fuel when the MAIN tank went dry.
Great design guys.
