10-29-2013, 08:03 PM
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#10 (permalink)
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Base Member
Join Date: Feb 2012
Location: Ontario
Posts: 61
Drives: '10 Nissan 370Z M6
Rep Power: 14
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Quote:
Originally Posted by phunk
With the RFS, we have effectively extracted more out of the same pump. Yes you could have used a bigger pump, but there are many reasons to not go larger on a pump than is actually needed, and that is why our cars didn't just come with 400lph pumps. But that is a whole different discussion.
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Car manufacturers don't put over sized fuel pumps on their cars for the same reason they go the returnless way... just to save a few bucks on each car made. It makes zero sense to use a returnless system over a return system apart to save money over component cost. I remember when I started doing my install on the Z and realized there wasn't any fuel return. The first thing that came to my mind was: "Why the F*** would Nissan do that!!", then I remembered that they didn't put an oil cooler on the car too... cheap bastards 
Oh well, guess that just means I'll have to throw money at you Charles at some point in the future.
Also, this might be a bit of a dumb question to ask you Charles as I'm pretty sure you tested that already, but did you ever put a fuel pressure gauge on the fuel rails to see at what point the OEM POS returnless system starts to drop in pressure? I'm guessing by the 500whp mark its already dropping a few psi of fuel pressure??
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