09-30-2018, 06:31 PM
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#1 (permalink)
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Master EcoModder
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Higher output power steering pump
Does anyone know what kind of effect a performance or higher pressure power steering pump would have on fuel economy? I would be interested in installing one on my vehicle if it doesn't negatively affect my fuel economy.
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09-30-2018, 06:31 PM
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#2 (permalink)
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Corporate imperialist
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Only if it pumps higher volume.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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10-08-2018, 10:06 PM
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#3 (permalink)
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Master EcoModder
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Are there any electric racks you can retrofit? I'm super pleased with the EPS in my Fit and Insight. Steering is silly light even at a dead stop.
Hydraulic power steering deletes often show large economy gains, so I'd expect going with a larger pump would have correspondingly worse economy.
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10-09-2018, 01:43 AM
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#4 (permalink)
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Master EcoModder
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oilpan, so you are saying that there would not be a negative effect on FE if I installed a big PSC hydro-assist power steering pump?
I've considered switching to electric. Do you have anything to say on the reliability of electric power steering systems? The reliability factor is pretty important for what I will be using my vehicle for.
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10-09-2018, 07:27 AM
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#5 (permalink)
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Master EcoModder
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I'm sure it would depend on the rack but Honda's OEM system has failure rates low enough that I've never heard of issues with it on any vehicle, ever. There's no fluid to deal with, no hoses to leak, just a small electric motor with a worm gear attached to what is otherwise a manual steering rack, and a torque sensor that detects which way you're trying to turn the wheels.
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10-09-2018, 09:50 AM
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#6 (permalink)
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Corporate imperialist
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I don't know the specifics on what you have versus the after market one.
My guess would be that the after market one does pump higher volume.
The problem is the higher volume pump is trying to do more work when it's unloaded. That's why it would use more fuel.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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10-09-2018, 03:08 PM
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#7 (permalink)
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ScanGauge <3
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What is the problem to be solved here? The old cars in my fleet without power steering taught me to steer while moving, instead of cranking on the wheel at a dead stop. Maybe just a change in technique would help...
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Best tank (so far): 32 MPG
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10-09-2018, 04:19 PM
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#8 (permalink)
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Master EcoModder
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Power steering is a pretty nice creature comfort to have while rock crawling.
Electric would be super cool but I think it would be complicated to implement. Ive seen systems you can swap in but they are all well over $1000. I really would like to make my own powerful electric steering but setting up things with my car's computer sound a bit too hard for me.
So I'm open to a conventional performance setup if it doesn't really hurt FE.
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