RCSB Z71 / BW S372 / E85 / Thoughts on Power?
#23
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The only reason to lower the fuel pressure would be to get the pumps into a range where they don't drop off at the high end (say 58 base + 20 boost, 78 lbs). The Walbros drop off a lot over 75 lbs because of the relief valve. Disabling the valves makes them not drop off as much so you can still run higher pressures.
#24
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The only reason to lower the fuel pressure would be to get the pumps into a range where they don't drop off at the high end (say 58 base + 20 boost, 78 lbs). The Walbros drop off a lot over 75 lbs because of the relief valve. Disabling the valves makes them not drop off as much so you can still run higher pressures.
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The pressure mod is not a cure all, the Walbros still lose a lot of volume at higher pressures. But not allowing the pressure relief valve to open at 75 psi helps a lot.
Look at the following picture, notice how the slope changes drastically @ 75psi. A modded pump will not fall off as fast.
http://autoperformanceengineering.com/pics/255lph.jpg
So far I've got enough fuel, we will see how far it can take me. I run the GTO around 45lbs base so 65lbs under boost and it has plenty of fuel for over 1000hp at the flywheel.
I'll try to get some videos this week.
Look at the following picture, notice how the slope changes drastically @ 75psi. A modded pump will not fall off as fast.
http://autoperformanceengineering.com/pics/255lph.jpg
So far I've got enough fuel, we will see how far it can take me. I run the GTO around 45lbs base so 65lbs under boost and it has plenty of fuel for over 1000hp at the flywheel.
I'll try to get some videos this week.
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