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Limiting power steering assist? #4536652
10/07/17 10:12 PM
10/07/17 10:12 PM
Joined: Jan 2014
Posts: 460
Australia
Spetz Offline OP
Spetz  Offline OP
Joined: Jan 2014
Posts: 460
Australia
Hi everyone,

Is there a way to limit the level of assist power steering provides?

I saw some people limiting the amount of PS fluid going into the pump for this but I am not sure if this may cause problems in the long run?

What would happen if some of those fins from inside the pump were removed?


2003 Mitsubishi Diamante 6G74 3.5L. 5 Speed auto. 155,000 miles. Shell Helix Ultra 5W40 at 6k OCI
Re: Limiting power steering assist? [Re: Spetz] #4536659
10/07/17 10:22 PM
10/07/17 10:22 PM
Joined: Apr 2010
Posts: 13,537
Chicago, IL
dparm Offline
dparm  Offline
Joined: Apr 2010
Posts: 13,537
Chicago, IL
Depending on the car, it might be changeable via software.


2017 Chevrolet Corvette Grand Sport
Re: Limiting power steering assist? [Re: Spetz] #4536675
10/07/17 10:39 PM
10/07/17 10:39 PM
Joined: Jan 2014
Posts: 460
Australia
Spetz Offline OP
Spetz  Offline OP
Joined: Jan 2014
Posts: 460
Australia
It's for an old car. Definitely not configurable via software


2003 Mitsubishi Diamante 6G74 3.5L. 5 Speed auto. 155,000 miles. Shell Helix Ultra 5W40 at 6k OCI
Re: Limiting power steering assist? [Re: Spetz] #4536681
10/07/17 10:47 PM
10/07/17 10:47 PM
Joined: Mar 2016
Posts: 1,255
CA
CharlieBauer Offline
CharlieBauer  Offline
Joined: Mar 2016
Posts: 1,255
CA
If you want the steering to feel heavier, then you could reduce the tire pressure.


It ain't what you don't know that gets you into trouble. It's what you know for sure that ain't so.

- mistakenly attributed to Mark Twain
Re: Limiting power steering assist? [Re: Spetz] #4536687
10/07/17 10:51 PM
10/07/17 10:51 PM
Joined: Jul 2003
Posts: 4,895
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,895
New Zealand
Old Hondas used to have a control valve on the gearbox, they had less power assist at road speed, more for parking.


1987 BMW R65 - Aegis SAE30
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Limiting power steering assist? [Re: Spetz] #4536825
10/08/17 06:07 AM
10/08/17 06:07 AM
Joined: Oct 2005
Posts: 7,094
Colorado
Kuato Offline
Kuato  Offline
Joined: Oct 2005
Posts: 7,094
Colorado
Reducing the amount of fluid in the ps system will cause problems eventually, the same as any hydraulic system with insufficient fluid.

IMO you'd need a different pump with a lower pressure output.

Removing fins would reduce volume as well as pressure so not a good option.


Thick vs Thin test: 15k / 43k miles complete
Re: Limiting power steering assist? [Re: Spetz] #4536863
10/08/17 07:15 AM
10/08/17 07:15 AM
Joined: Jun 2009
Posts: 430
New England
555 Offline
555  Offline
Joined: Jun 2009
Posts: 430
New England
Complete conjecture here, you've been warned.
What about a pulley for the PS pump that slows the pump down? You would have to work out the size of the pulley compared to original and keep an eye on the ratio to the crank pulley. This could in theory make your steering feel less light but could also affect how quickly the PS system recovers from left to right turning motions.


84 XJ6 M1
92 Mustang 5.0 Redline
99 Tahoe 2 door Castrol Edge
99 MX5 Miata Anniversary Edition M1
04 Subaru STi Motul
Re: Limiting power steering assist? [Re: Spetz] #4536872
10/08/17 07:30 AM
10/08/17 07:30 AM
Joined: Oct 2008
Posts: 19,197
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,197
Sunny Florida
Originally Posted By: Spetz
Hi everyone,

Is there a way to limit the level of assist power steering provides?

I saw some people limiting the amount of PS fluid going into the pump for this but I am not sure if this may cause problems in the long run?

What would happen if some of those fins from inside the pump were removed?


I have done this to tracked cars in the past. It can help with the system overheating and can improve the "feel", just remember that it is a mirage. It's really just heavier.

Where it seems risky to me is on the street. If you need a QUICK transient there may be no power assist and it will feel like you hit a wall.


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: Limiting power steering assist? [Re: Spetz] #4536892
10/08/17 07:50 AM
10/08/17 07:50 AM
Joined: Jun 2003
Posts: 5,951
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,951
Illinois
Is there a pressure sensor in the system?


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Limiting power steering assist? [Re: Spetz] #4536894
10/08/17 07:52 AM
10/08/17 07:52 AM
Joined: Jun 2003
Posts: 33,561
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,561
ME
Hydraulic power steering spends most of its time in bypass. It has to be strong enough to let you parallel park at idle. If you reduce the pump output it'll be terrible at idle and not much different at speed.

If you want "better road feel" look elsewhere.

How do we know this clunker doesn't have bad, loose ball joints etc?

Re: Limiting power steering assist? [Re: Spetz] #4538276
10/09/17 03:51 PM
10/09/17 03:51 PM
Joined: Dec 2016
Posts: 94
Indiana, USA
Smoqueed Offline
Smoqueed  Offline
Joined: Dec 2016
Posts: 94
Indiana, USA
Originally Posted By: Spetz
I saw some people limiting the amount of PS fluid going into the pump for this but I am not sure if this may cause problems in the long run?


WHAT? That's terrifying. Sounds like how to cause PS pump failure 101.

Re: Limiting power steering assist? [Re: Spetz] #4538956
10/10/17 09:47 AM
10/10/17 09:47 AM
Joined: Jul 2002
Posts: 4,548
KY
MCompact Offline
MCompact  Offline
Joined: Jul 2002
Posts: 4,548
KY
On older GM recirculating ball PS systems you could adjust the assist level by changing the spool valve. On modern EPS systems it can only be adjusted via software.


Mine:
2014 M235i
2009 Cooper Clubman
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2015 X1 xDrive28i


Son's
2009 328i

Buy what makes you smile...
Re: Limiting power steering assist? [Re: Spetz] #4538972
10/10/17 10:01 AM
10/10/17 10:01 AM
Joined: Jun 2003
Posts: 5,951
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,951
Illinois
I had a set up on my '97 Taurus SHO that would kill the PS sensor at WOT. It would reduce the variable assist. The older SHOs had a stepper motor that would change with speed. Many would get it to the level off assist (by speed) they wanted and kill it there providing a stiffer steering all the time.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Limiting power steering assist? [Re: Spetz] #4539839
10/11/17 06:12 AM
10/11/17 06:12 AM
Joined: Feb 2007
Posts: 3,699
Southeast
meep Offline
meep  Offline
Joined: Feb 2007
Posts: 3,699
Southeast
ditto spool valve. or changing the torsion bar inside the spool valve. I have a feeling it's a part which can be sourced with enough research.


2018 F150
2015 crv (wifey!)
Re: Limiting power steering assist? [Re: 555] #4541013
10/12/17 08:06 AM
10/12/17 08:06 AM
Joined: Jan 2013
Posts: 2,099
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 2,099
Texas
Originally Posted By: 555
Complete conjecture here, you've been warned.
What about a pulley for the PS pump that slows the pump down? You would have to work out the size of the pulley compared to original and keep an eye on the ratio to the crank pulley. This could in theory make your steering feel less light but could also affect how quickly the PS system recovers from left to right turning motions.


I would think you would want more assist parking than at speed . Therefore , changing the pully size would seem to reduce pressure when the engine id rotating slowly and tou need it most ?

Wyr
God bless


Wyr
God bless
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