I took a few quick measurements from the subframe this weekend, and I want to run something by the forum before going ahead with it. Basically I want to raise my rear subframe to correct some geometry, while it's out and getting bushings anyway.
The Al bushings that I have are 29mm high each (total height of 58mm).
Each bushing has a 9.2mm lip on the end with a larger diameter (75mm) than the subframe "cup" that it sits in (66mm). Essentially the amount of bushing that will be inside the subframe is 39.6mm if installed as is.
I measured the height required to fill the subframe, which is 58mm with the stock metal bushing cup that is pressed into the subframe, and 55mm with this cup removed. So I'm working with 55mm.
Basically if I install these as is, they won't completely fill the subframe space, but that's fine since they'll be pressed in and held with the bolt from the frame of the car. I don't want to install as is though, I want to cut the 75mm lip down to 66mm (the od of the rest of the bushing) so that I can raise the subframe by 9.2mm on top.
Basically I'd be putting the upper bushing on the lathe and turning down the lip so that it sits inside the subframe and raises it that amount.
The problem that I run into is that if I only turn down one bushing, they won't completely fill the subframe, and I think the upper bushing will just move into the subframe, not making contact with the chassis.
I can:
1) Turn the upper bushing down and also turn the lower bushing down until it has a 3mm lip, filling the subframe with aluminum bushing completely, and keeping it against the chassis.
2) Turn down the upper bushing, leave the lower bushing as is, and use a spacer to fill the subframe.
3) Only install the lower bushing, and let the subframe rest against the chassis.
So given that I want to raise the subframe, I obviously don't want any bushing material above the subframe, I'll either have to turn down the upper bushing, or not install it at all.
Will I have any issues not installing the upper bushing?
Any issues with the subframe against the chassis?
Do I want a bushing pressed into the subframe regardless?
Is a 3mm lip too small on bottom? Maybe use a washer in addition?
Other comments?
Note:
The metal insert that the bolt runs through in the stock bushing is 68mm (I think), so would my total height change really be (58mm - 9.2mm) or (68mm - 9.2mm) with this modification?
I guess that the overall height change depends on the distance from subframe to chassis with the stock bushing?
Thanks.
The Al bushings that I have are 29mm high each (total height of 58mm).
Each bushing has a 9.2mm lip on the end with a larger diameter (75mm) than the subframe "cup" that it sits in (66mm). Essentially the amount of bushing that will be inside the subframe is 39.6mm if installed as is.
I measured the height required to fill the subframe, which is 58mm with the stock metal bushing cup that is pressed into the subframe, and 55mm with this cup removed. So I'm working with 55mm.
Basically if I install these as is, they won't completely fill the subframe space, but that's fine since they'll be pressed in and held with the bolt from the frame of the car. I don't want to install as is though, I want to cut the 75mm lip down to 66mm (the od of the rest of the bushing) so that I can raise the subframe by 9.2mm on top.
Basically I'd be putting the upper bushing on the lathe and turning down the lip so that it sits inside the subframe and raises it that amount.
The problem that I run into is that if I only turn down one bushing, they won't completely fill the subframe, and I think the upper bushing will just move into the subframe, not making contact with the chassis.
I can:
1) Turn the upper bushing down and also turn the lower bushing down until it has a 3mm lip, filling the subframe with aluminum bushing completely, and keeping it against the chassis.
2) Turn down the upper bushing, leave the lower bushing as is, and use a spacer to fill the subframe.
3) Only install the lower bushing, and let the subframe rest against the chassis.
So given that I want to raise the subframe, I obviously don't want any bushing material above the subframe, I'll either have to turn down the upper bushing, or not install it at all.
Will I have any issues not installing the upper bushing?
Any issues with the subframe against the chassis?
Do I want a bushing pressed into the subframe regardless?
Is a 3mm lip too small on bottom? Maybe use a washer in addition?
Other comments?
Note:
The metal insert that the bolt runs through in the stock bushing is 68mm (I think), so would my total height change really be (58mm - 9.2mm) or (68mm - 9.2mm) with this modification?
I guess that the overall height change depends on the distance from subframe to chassis with the stock bushing?
Thanks.
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