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 Post subject: Weird grinding when accelerating in a turn
PostPosted: Tue May 02, 2017 2:37 am 
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Vehicle: MY06 SG9 XT

Posts: 33
Location: South Africa
I was hoping I could pick your brains about something that's been driving me crazy. I have a 2007 SG9 XT with about 160k on the odometer. What happens is that anytime I accelerate hard and turn, or turn and then accelerate hard, or even if I accelerate and overtake some other car, I feel a sort of grinding from the car. I can't quite tell whether it's through the steering wheel or the floor of the car (if that makes sense). And it feels like gears slipping. The first thing that came to mind was that the steering rack was going bad, but the fluid reservoir is full, there's no bubbles, it's not black, etc. I also sometimes when pulling out of my driveway onto the road, hear a single clunk like a bad CV joint or really bad wheel bearing would produce. (there's no grinding or whining from any of the wheels, so I'm assuming it's not a bearing at any rate).

But anyway, I'm not discounting anything. Thing is just that Google seems to be hung up on the center differential, but there's no binding or surging and it's not the type of gear whine a broken center diff makes. In fact, I don't think there's a distinct audible noise. It's just sort of a feeling like gears are slipping. Let's say kind of like an old, cheap impact drill with worn bushes (minus the irritating whine).

I hope my attempts to describe the situation has made it MORE clear, not less :D

Anyone experience something similar? I don't know whether it could be related at all, but I first noticed this the day after I had a custom downpipe fitted which interfered with the steering. I took the car back and had them increase the clearance between the steering rack and the downpipe. Whether these two things are related, again, I don't know, but that was the day I first noticed it.

The car doesn't do it when gunning it in a straight line, or coasting through a turn. It's only when I step on it that I feel the "slipping gears". And it will do it while cold AND warmed up.


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 Post subject: Re: Weird grinding when accelerating in a turn
PostPosted: Tue May 02, 2017 12:25 pm 
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I Say: I am a Subarist!
Vehicle: 06 JDM STi Foz

Posts: 1939
Location: Sydney
Gday,
Reads like the dump is still vibrating on the steering knuckle....it will be most noticeable when turning and accelerating hard left in a RHD car.

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 Post subject: Re: Weird grinding when accelerating in a turn
PostPosted: Tue May 02, 2017 4:03 pm 
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I Say: Do or do not, there is no try.
Vehicle: MY17 BRZ, MY11 BT-50

Posts: 16119
Location: Medowie (near Newcastle), NSW
carsubie wrote:
Gday,
Reads like the dump is still vibrating on the steering knuckle....it will be most noticeable when turning and accelerating hard left in a RHD car.


Yep, the first bit sounds dump pipe to steering knuckle contact.

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 Post subject: Re: Weird grinding when accelerating in a turn
PostPosted: Tue May 02, 2017 5:41 pm 
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Vehicle: MY06 SG9 XT

Posts: 33
Location: South Africa
Thanks. I'll take a look. Or, rather, I'll take it to the exhaust shop so they can have a look.


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 Post subject: Re: Weird grinding when accelerating in a turn
PostPosted: Tue May 02, 2017 7:37 pm 
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Vehicle: MY06 SG9 XT

Posts: 33
Location: South Africa
carsubie wrote:
Gday,
Reads like the dump is still vibrating on the steering knuckle....it will be most noticeable when turning and accelerating hard left in a RHD car.


That it is.


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 Post subject: Re: Weird grinding when accelerating in a turn
PostPosted: Fri May 05, 2017 9:02 am 
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I Say: subtle sooped-up subie stokes surprise!
Vehicle: MY06 built SG STI conversion

Posts: 5942
Location: Sydney
Replacing the steering knuckle with a GR/GV STI knuckle will fix this.

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 Post subject: Re: Weird grinding when accelerating in a turn
PostPosted: Fri May 05, 2017 6:49 pm 
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Vehicle: MY06 SG9 XT

Posts: 33
Location: South Africa
itsjasper wrote:
Replacing the steering knuckle with a GR/GV STI knuckle will fix this.


Awesome, thanks. I should've joined this forum long ago. The South African guys are good at giving advice and pretty clever. That is, IF one of them is ever online. :lol:


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 Post subject: Re: Weird grinding when accelerating in a turn
PostPosted: Fri May 05, 2017 7:41 pm 
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I Say: Car mods are like OddBodz, you got to collect them all! -------------------------------------
Vehicle: MY05 STi swapped sled

Posts: 17128
Location: Spearwood Perth WA
itsjasper wrote:
Replacing the steering knuckle with a GR/GV STI knuckle will fix this.

Thats interesting. Are they the same length?

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 Post subject: Re: Weird grinding when accelerating in a turn
PostPosted: Tue Sep 12, 2017 11:09 pm 
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Vehicle: MY06 SG9 XT

Posts: 33
Location: South Africa
Update: had the exhaust fitment guys do whatever they had to do and now the problem is gone. Apparently, from another forum, the XT's engine bay is such that it forces the downpipe to come closer to the steering rack than in a WRX.


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