hi all

my car has done this for ever, and i remember seeing a thread about it previously.

From time to time, not every time if i launch my car or jump on the brakes really hard - i.e. abs going off i get a really solid bang from under the car. now I'm pretty sure it is either the engine or transmission hitting the underside of the car, but i am just wondering what does it and what the solution is - i.e. stiffer engine/trans mounts or is it the dog bone mount that isn't stiff enough

any ideas

and no there are no broken mounts etc, and it is not a suspension or brake noise but more a super solid bang when the car is jumping around.

cheers

Tom

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Version 6 STI

Rear subframe bushes look ok?

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[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

Rear subframe has no bushes, locked solid to the chassis, but the bang is defiantly from the front, like under the drivers feet towards the centre. I have never been able to see any marks etc under the car but i read somewhere on pwrx about this before.

You have to either have serious hopping in the front when launching or be under super hard abs braking, where the car jumps around, so not under normal driving..

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Version 6 STI

checked your lower control arm rear bushes?

You are rather...umm ...agressive on your car Mr Trembarth!!
It could be the intercooler hitting something (eg strut brace?) ...my '06 STI used to do that before we put Group N engine mounts in...it's also worth while putting the Group N gearbox mount in...

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No Subarus currently owned

Hey Mr Pummer, it has been a long time!

Where did you get the group n mounts from?

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Version 6 STI

I got the gearbox one via Japan Parts but I think the engine mounts were through MMS...

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No Subarus currently owned

Is there some play in the prop shaft? Could be sliding back and forth slightly. Just a thought ..


using the Perth-WRX mobile app

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Slow is smooth and smooth is fast.

Seems I now have the same issue......I'm thinking either G/box mount or Pitch stopper in my case.

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[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

No play in anything, shafts all tight, bushes all good/solid

Could be weak transmount i have never changed it although its not broken. Feels more to the front of the car though, feels more firewall, could be the intercooler

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Version 6 STI