This is an annex of https://www.grcorollaforum.com/thre.../solved-check-your-subframe-bolts-clunking-knocking-noise-during-autocross.4218.
I figured I'd make a new thread for visibility on the front subframe tightening instructions for quick reference.
![Image]()
I made that diagram because it's hilariously hard to read the original one from the service manual.
Disclaimer: I did my best but I may be wrong, please double check against the service manual.
Note: some of these bolts require a counterhold, and it needs to be a wrench not a socket.
If you don't, it will just hopelessly spin around, go nowhere, and destroy the paint on your subframe.
On my 2024 MY car, the red, green and pink bolts had 19mm bolts and nuts. The other ones I didn't get to, but they looked bigger.
Use the biggest 1/2" torque wrench you can find, you will need the leverage. I used a 250 ftlb torque wrench.
Here are the annotations:
*: this bolt is located behind a through-hole through the lower control arm, and is located higher in the Z axis. there are "wings" in this subframe that connect to the body, and this bolt interfaces on that wing. Use a long extension through the LCA hole and tighten it.
†: these are front lower control arm bolts, but they go in the "X" direction as opposed to all the other bolts, which go in the "Z" direction. You won't have access to it from under the car.
§: this fastens the "pitch mount", i.e. the engine to the subframe. I didn't tighten this since it was such a high torque value so I didn't figure it would loosen.
For a "fun fact" note, the 104 ftlb bolts connect the subframe to the chassis, 92 ftlb and 177 ftlb bolts connect the lower control arm to the subframe, 98 ftlb the subframe to the steering rack.
I figured I'd make a new thread for visibility on the front subframe tightening instructions for quick reference.
I made that diagram because it's hilariously hard to read the original one from the service manual.
Disclaimer: I did my best but I may be wrong, please double check against the service manual.
Note: some of these bolts require a counterhold, and it needs to be a wrench not a socket.
If you don't, it will just hopelessly spin around, go nowhere, and destroy the paint on your subframe.
On my 2024 MY car, the red, green and pink bolts had 19mm bolts and nuts. The other ones I didn't get to, but they looked bigger.
Use the biggest 1/2" torque wrench you can find, you will need the leverage. I used a 250 ftlb torque wrench.
Here are the annotations:
*: this bolt is located behind a through-hole through the lower control arm, and is located higher in the Z axis. there are "wings" in this subframe that connect to the body, and this bolt interfaces on that wing. Use a long extension through the LCA hole and tighten it.
†: these are front lower control arm bolts, but they go in the "X" direction as opposed to all the other bolts, which go in the "Z" direction. You won't have access to it from under the car.
§: this fastens the "pitch mount", i.e. the engine to the subframe. I didn't tighten this since it was such a high torque value so I didn't figure it would loosen.
For a "fun fact" note, the 104 ftlb bolts connect the subframe to the chassis, 92 ftlb and 177 ftlb bolts connect the lower control arm to the subframe, 98 ftlb the subframe to the steering rack.
