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Old 04-30-2016, 03:24 AM   #1
obsessionz
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Default 2012 Wrx with 2016 sti steering rack swap - Steering Shuddering at Low Speed Corning

Hey guys just installed a 2016 sti steering rack into my 2012 WRX when taking corners at low speed the steering is giving me a shutter like it is loosing power. Any ideas ?
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Last edited by obsessionz; 04-30-2016 at 03:53 AM.
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Old 04-30-2016, 05:02 AM   #2
Krang
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Well...

From memory the units are very different. Don't recall if the bushings are different, but I'm pretty sure that the tie rod ends are different lengths. This would cause one wheel to lock while the other is still not reaching the correct ackerman position and might cause shutter. When you swapped racks did you use your WRX tie rod ends? If not, you should.

The other possibility is that the bushings are different. You should really try searching first because there is a thread all about swapping to the new quick ratio steering rack.
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Old 04-30-2016, 05:04 AM   #3
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Hey look its on the first page of this section, go figure. Here you go friend.

http://forums.nasioc.com/forums/show....php?t=2679348

Oh, l2search n0ob, rant rant rant, nasioc since 2k6 I'm out.
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Old 04-30-2016, 05:20 AM   #4
obsessionz
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It is a direct swap for my car. I've done research heaps of people have done the swap. Does this mean there is air in my power steering fluid?
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Old 04-30-2016, 05:57 AM   #5
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I spoke to my mechanic and he said it sounds like it is air in the power steering pump as he just changed the fluid. He said give it time and it should go away by itself? Could this be the reason?

Last edited by obsessionz; 04-30-2016 at 09:13 AM.
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Old 04-30-2016, 09:22 AM   #6
Endika
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Default 2012 Wrx with 2016 sti steering rack swap - Steering Shuddering at Low Speed ...

Air wont cause a shudder. Either bad pump or extremely low on fluid will. Possibly loose belt as well
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Old 04-30-2016, 09:36 AM   #7
obsessionz
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Quote:
Originally Posted by Endika View Post
Air wont cause a shudder. Either bad pump or extremely low on fluid will. Possibly loose belt as well
Ok thanks for that, so has nothing to do with the actual steering rack part itself?
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Old 05-02-2016, 09:52 AM   #8
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Likely is the pump itself. From my research on this, while the rack swap is fine mechanically, there is an internet rap battle going on with regard to the power steering pump needing to be "matched" to the rack. The 15+ 13:1 rack has a different pump with moar PSIs or HP or whatever pumps make. Johnny User A says that if you use the wrong pump, it will make noise/shudder/blow up and kill you. Johnny User B says that they are using the wrong pump and all is well. Who is right? It really depends on you. I just did the swap myself on my 2004 WRX using a 2 month old WRX spec power steering pump that was sourced from the finest power steering pump makers in China for $29 + $10 core charge. So far, I've been super easy on the car (today being day 2 of swap) and have only experience slight noises near lock in parking lots. Did I have those before? Is my OCD hearing fooling me? Is my pump about to explode? I'm not sure on any of these issues, but its in the back of my mind that if things go south, I'll likely swap my pump out to the "proper" 15+ STI Chinese $29 power steering pump, but I'm hoping for the best until that day. It could also be air (though in MY experience, Subaru PS systems tend to self bleed really quick) or a loose or more likely wet belt (whole car looked like a power steering fluid murder scene when we were done) from PS fluid.
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Old 05-05-2016, 09:06 AM   #9
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Ok so I can confirm when doing spirited driving around a hard corner at decent speeds the car would feel like it all of a sudden is braking then quickly regains normal steering feeling.

The only fix so far is to turn off the traction control. This completely removes the issue? Anyone have any ideas how I can fix it permanently without having to turn traction control off every time? Any help or feedback would be greatly appreciated.
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Old 05-11-2017, 03:52 AM   #10
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Damn this thread just died? So what happened obsessionz?
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Old 09-13-2017, 05:39 PM   #11
SecularSti
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Default Bump from the Dead

I also am having a similar problem. I have a +15 rack on my GR and the car exhibits the shuttering at low speeds, especially when turning into a parking spot. The steering pump whined before the swap, but now the whine seems to be getting progressively worse. I am curious if you found a solution to your problem? I am thinking my pump might be going out.
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Old 10-23-2017, 07:55 AM   #12
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Quote:
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Damn this thread just died? So what happened obsessionz?
What happened? Been turning traction control button off everyday! lol that's what happened, that's the only fix I know of so far.
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Old 10-28-2017, 02:25 PM   #13
kingsalami
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Two possibilities:

1. PS pump is cavitating...often due to a leaky O ring at the top of the pump where the return line bolts on. If you're near 100K miles, it could also point to a PS pump that's on it's way out. I installed a new PS pump when I had my engine rebuilt this summer @ 116K miles. The slight shutter and whine I used to have at low speeds/tight turns is now gone. That little bastard is expensive, though!

2. The traction control system is seeing excessive steering input for conditions since the '15 rack is quicker. I've had a '15 STI rack in my '09 WRX for about 8 months, and have only has the VDC kick in a couple times when I'm cranking a tight corner. I try to keep the nannies switched off to avoid this.

Last edited by kingsalami; 10-28-2017 at 02:30 PM.
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