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Old 01-28-2016, 09:30 PM   #4 (permalink)
mwilliamshs
EcoModding Apprentice
 
Join Date: Apr 2015
Location: USA
Posts: 148

VanDelay - '89 Ford Econoline E-150 XL
90 day: 15.93 mpg (US)

Old White Civic - '98 Honda Civic LX, AT
90 day: 33.18 mpg (US)
Thanks: 5
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Quote:
Originally Posted by oil pan 4 View Post
The power steering system only develops those high pressures when the steering wheel is turned. When driving straight the pump is allowed to full bypass, only developing a max of 100 to 200psi.
Even then it still takes around 1 hp to turn it...
Yeah I've read your threads. Interesting stuff with hpus and whatnot. If mpg was my only reason for considering the pump mods I wouldn't. That being said, the bypass valve is exactly what I plan to modify. By reducing the preload on the bypass valve spring, the pump will be allowed to full bypass more often, reducing its power drain just like driving straight more of the time. The flow control orifice can also be modified (my second stage of planned mods) to allow fewer gpm max flow.
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