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YOUR RESEARCHSolid rear subframe bushes
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Replace design of the gearbox bush
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Seems they are very open to feedback since they changed the design of the gearbox bush after feedback from Alex on here I think
Leading evidence: 'Replace design of the gearbox bush' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace design of the gearbox bush' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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I haven't had my geometry done yet so can't comment on that aspect, but I'm running adjustable arns anyway.
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Same as me then, I used Eibach -30mm springs with my M030 shocks but they seemed lower than others and I needed 10mm spring perch spacers and adjustable toe arms to get the car to X74 geo spec.
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Suggestion · Original poster
On a google last night I see design 911 do some solid bushes which change the height.
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Same as me then, I used Eibach -30mm springs with my M030 shocks but they seemed lower than others and I needed 10mm spring perch spacers and adjustable toe arms to get the car to X74 geo spec.
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911uk: 1 discussions
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I'm planning on stripping the rear subframe as part of my overhaul. On a google last night I see design 911 do some solid bushes which change the height. What they're saying is that on a lowered car it will help bring the geometry back into spec.
Has anyone gone this way?
Will this do away with the need for adjustable toe arms?
Also these are £200 for a very simple looking bush and washer. Has anyone had these made?
As usual, all help and pointers welcome
I think I ended up with the elephant racing ones. You are right that there isn't a lot to them. My understanding is thatbit raises the subframe around 1/2" to the same as the GT3. The hardest part of fitting then was pushing out the old bushes from the subframe. I haven't had my geometry done yet so can't comment on that aspect, but I'm running adjustable arns anyway.
MC
Thanks mc. Should've known you'd be down that road. Looks very simple but I also see polybushes aren't expensive but it's the height that has me interested.
911 munky. It's not so I don't have to get adjustable toe arms as such, it's more that the original bushes will be well past their best and I'll have it all out at some stage here. Saying that, I'd say if I go the solid bush route, I'll probably not bother with adjustable arms as I'm only on lowering springs on my m030 shocks.
Same as me then, I used Eibach -30mm springs with my M030 shocks but they seemed lower than others and I needed 10mm spring perch spacers and adjustable toe arms to get the car to X74 geo spec. Anyway all sorted now.
I don't suppose by any chance you haven't fitted them yet mc? Bit of a long shot but I was hoping to get my hands on some and get a few sets made for the good of all on here. Can't be too much to make
This picture illustrates it rather well:
The angle of the lower links is ideally horizontal at rest - when you lower a car these can end up in a sub-optimal position which can lead to issues with roll centre. Pulling the subframe up higher can help to counteract this.
Plus being solid removes any uncontrolled movement at the expense of some NVH.
Have you seen that power flex do subframe bushes? No mention of them changing height but I wonder if the washers shown will do that? Price wise though I guess they won't be far off the elephant racing ones.
https://www.powerflex.co.uk/products/996+(1997-2005)-525/1.html
You might ask them to design them for a height change. Seems they are very open to feedback since they changed the design of the gearbox bush after feedback from Alex on here I think
Polybushes are very easy to make if you can be bothered to make a mould. On that note I might have a stab at it for the dog bones and others. Big advantage is you can choose the compound you want and make them for peanuts when the moulds are right
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