Adjust power steering assist?

[OldNick]

2013/13 GT.


Is it possible to adjust power steering assist on this car?

Thanks for any help.

Nick

[BillyCorgi]

No, not easily.
Do you want it lighter? (you did not say what way you wanted to adjust?)

The GT Turbo should have 8.5cc per rev pump.
You could try a 9.6cc per rev pump of a Gen4 H6, but the H6 pump has a 6PK pulley and you would need to confirm compatibility?

[OldNick]

Thanks for that. I was typing on my phone in a moving car (passenger!) Hence my brevity.

However you have answered my question, if it's not just a turn of a control or whatever.

I wanted to lighten it. It s very drect steering and whle it's not hard to steer, find have to concentrate much more, and react much faster than I have found in any other car, to prevent wandering. This has been since new, so it's not alignment or anything like that.

I am pretty careful about it, but wife wanders more than I lke.

Some of it is to do with the direct steering ratio, I reckon, becase you have to move very lttle to cause deviation. I just hoped that if ut was lighter, you may be able to correct quicker and easier, in tiny increments. For all know it may make it worse, so I do not want to do too much to try t!

Nick

[bigBADbenny]

Alignment might help, failing that add caster adjust LCA's for greater straight line stability and return to centre.

[RX25SE]

double post fail....

[RX25SE]

I wanted to lighten it. It s very drect steering and whle it's not hard to steer, find have to concentrate much more, and react much faster than I have found in any other car, to prevent wandering.

Sounds like this really has nothing to do with the weight of the steering (amount of assist), more like the ratio. It probably has a lower ratio (less turns lock to lock) than what you have been used to, hence less steering input has a greater effect on making the vehicle change direction.

Lightening it will still give you the same problem, possibly even making it worse as the wheel would be easier to turn.

[OldNick]

Alignment and toe in are meticulously kept up to date, so unless I asked specifically for more toe in that would appear to not be it.

Yeah making it lighter would probably make it worse, if it is the steering ratio. As I said, that's why I did not want to go to too much trouble trying it. I thought there may be a simple valve adjustment.

Nick

[bigBADbenny]

I cant see it neccesarily being ratio related as the issue is described as about-centre related.

What tyres and tyre pressures are you running?
Stock or aftermarket rims/suspension and what tyre spec?
What is the exact spec of your most recent alignment?
Eg post a pic of the printout.
Who did the alignment and whats their opinion of your feedback on the matter?
Is the toe fine tuned for example to keep treadwear even?

Do you have play in the wheel at rest, engine off?
Could be the guibo in the universal joint is flogged out

Personally I wasnt a fan of the super light gen4 stock steering feel but an STi uni, pokey rims and caster adjust LCA bushes sure helped

[OldNick]

Before I try to find the alignment specs (done by Subaru) and deal with all the questions (I fully understand their being asked), I will say that this car has been like this since absolute new. Stock tyres and wheels, inflated to 32-33 psi. The steering is as tigt as a drum, no play at all.

An alignment helped a bit, but the feeling is still there.

Nick

[bigBADbenny]

Modern high performance low profile tyres can be run up to within 10% of their maximum rating according to some sources.
I was recommended to run my S001's at 40psi for example, and I do, for a variety of benefits, including tyre wear, handling and fuel economy. Maybe try it on yours?

[OldNick]

OK I will check that out. The car is not vague like low tyre pressure, or wandery like loose steering (and believe me I have driven some doozies) I still think it may be the direct steering ratio means you have to watch. But yeah I will try higher pressures. Trouble is diagniosing is tough as my wife is slack about pressures I guess if I set the pressure high at least slackness will only result in normal pressures

Nick

[RX25SE]

It s very drect steering and whle


Some of it is to do with the direct steering ratio,

I cant see it neccesarily being ratio related as the issue is described as about-centre related.

I'm still going with a faster than normal ratio....

Experienced the same thing when I got the RB, now it just seems normal.

[OldNick]

Hmmm...so I faced with either teaching my wife how to handle it properly or being a nervous passenger.

Nick

[bigBADbenny]

Anyone know what ratio the genV Gt rack has?
Never driven one...
PostFL is 3.1 turns, not even "fast", and iirc slower options eg outback/forester are slower/variable...

I'm going with add caster to fix described issue
Should be due for new LCA's by now
Some caster can be added with camber/caster tops, Moore performance offer a street version of drummond rally tops, look into other options from whiteline and Carstation Marche in Japan...

Since that's info perhaps only known to myself, at least in this hemisphere, here's a link:
http://translate.googleusercontent.com/ ... cZwwrsad2g

Loooool

[OldNick]

Hey guys, just to let you know as you all pitched in.

I tink I figured it out. A couple of monts back we had new tyres fitted and I reckon that's wen we noticed the heavy/vague steering. I can't tell if it's these particular tyres, or that with new, deep tread it just makes it more marked.

Nick