ST185 power steering not keeping up

Suspension and other discussion

ST185 power steering not keeping up

Postby Roundy » Fri Apr 25, 2014 2:25 am

Hi Guys,

Had a bit of an issue in the motorkhana, which i have had before.

Basically get to a slalom, and it seems i get no power assistance through there and the steering becomes amazingly heavy.

It would seem that this sort of problem is not uncommon through a lot of cars, however i have seen nothing to really suggest how to fix it!

Any suggestions would be much appreciated

Cheers
Nathan
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Re: ST185 power steering not keeping up

Postby quieter » Fri Apr 25, 2014 3:38 am

is it leaking?
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Re: ST185 power steering not keeping up

Postby Roundy » Fri Apr 25, 2014 6:11 am

No.

Also worth noting it has an aftermarket PS cooler, but had the same issue with it totally stock
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Re: ST185 power steering not keeping up

Postby RedCelicaTRD » Mon Apr 28, 2014 6:25 pm

Does it only happen in a slalom or have you noticed it at other times?
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Re: ST185 power steering not keeping up

Postby ALLensTRAC » Mon Apr 28, 2014 8:01 pm

This sounds like high pressure related vein bypass in the pump. I would rebuild the pump and have a good look inside for anything obvious. If it's only occurring at the limits during a slalom you may have reached it's pressure limit. A quick left to right to left can provide delay in assist. This is why I'm working on electric steering for my car.
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Re: ST185 power steering not keeping up

Postby Roundy » Mon Apr 28, 2014 9:24 pm

I have only had it occur in the slalom, never noticed it anywhere else.
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Re: ST185 power steering not keeping up

Postby Mafix » Sun May 04, 2014 9:34 pm

and it's not bump steer?
have you done a suspension check over? i'd imagine it's something else.
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Re: ST185 power steering not keeping up

Postby MWP » Mon May 05, 2014 1:37 am

Roundy wrote:I have only had it occur in the slalom, never noticed it anywhere else.


After mine first happened at the motorkhana, it also started happening at shopping centres, etc :(
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Re: ST185 power steering not keeping up

Postby Roundy » Mon May 05, 2014 10:34 am

How would bump steer result in stupendously heavy steering?
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Re: ST185 power steering not keeping up

Postby MWP » Mon May 05, 2014 1:08 pm

It cant... odd suggestion there Mafix.
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Re: ST185 power steering not keeping up

Postby Mafix » Mon May 05, 2014 5:57 pm

making sure its not a binding issue. I've seen bump steer do some strange shit.

edit: we may be defining bump steer differently. at any rate, before the pump/rack are replaced, the front suspension needs to be checked first.
what fluid are you using in the system?
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Re: ST185 power steering not keeping up

Postby Roundy » Tue May 06, 2014 8:38 am

Penrite fluid is what i am using

Pretty confident that the suspension is all right.
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Re: ST185 power steering not keeping up

Postby ALLensTRAC » Tue May 06, 2014 10:18 am

Can we have a breakdown of current mods suspension wise? Also when was the last time you opened the PS system? Have you replaced the steering rack? Pump? I know you said you have a cooler but what are the dimensions? Is the fluid thicker or thinner than say Dexron trans fluid?
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Re: ST185 power steering not keeping up

Postby Mafix » Tue May 06, 2014 8:36 pm

Roundy wrote:Penrite fluid is what i am using

Pretty confident that the suspension is all right.

isn't penrite a brand name for lots of fluids?
and pretty confident should ever be good enough. it's not that hard to check her over.
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Re: ST185 power steering not keeping up

Postby Roundy » Tue May 06, 2014 9:18 pm

Suspension mods:
BC Racing coil overs adjusted for ~2.5° camber, and rotated strut tops for 1° extra camber
Poly bushes all round
Have not pulled out/replaced the pump or the rack, and they have a lot of kms on them (280k kms)

Fluid is: http://www.penriteoil.com.au/products.p ... oducts=160

The cooler is only a small 7 row cooler

Caveat here: I had the issue with a completely stock power steering setup as well.

The only time i have had the problem is through this tight slalom. No other part of the course showed this issue, or any track days, parking lots anything.

The slalom is straight after a burst to the rev limit in first gear.
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