stoopid
1000 Posts Club!
Wanted to give a quick synopsis of what I've done and the result on my 2021 GT...
1) Immediately noticed the thunk, the worse the bump the louder the thunk. Googled and found many posts and a few videos. Remedied using some 1/4" thick foam insulating strip (adhesive on one side), placing across the existing foam padding and across where the screws come through (punching a small hole for the screws). Adds just enough gap when compressed once the screws are tightened. It eliminated about 95% of the thunk, only the worse bumps would thunk and only a little.
2) Curious about removing all thunk, purchased some 5/16" washers at home depot. Installed two washers as described online (one for each screw). The thunk was entirely gone, but at speed I now had a persistent (and annoying) whistling sound. Removed the washers and the thunk reappeared but the whistling sound went away.
3) Reapplied strip foam from #1, thunk is again mostly gone and no whistling. Man those tolerances are razor thin.
4) Also need to mention I've done the bump stops as outlined in the prior video, but doing that alone doesn't stop the thunk.
I think the upper plastic piece on the 2021 model hatch isn't the exact same as prior years, it seems to have plastic around the screw hole that protrudes up when compared to other pictures I've seen, specifically the washer nestling into the foam around it in a way my washers cannot. Attached is a side-profile pic of my top plastic part. Adding a washer pushes this piece down too far and creates a gap for wind to intrude, creating the whistling. Foam compresses enough to be thinner than the washer, but thick enough to force the plastic pieces together/no thunk.
Maybe this will be helpful to others trying to fix this. IMO this problem shouldn't exist, but it's really my only complaint thus far with the car.
1) Immediately noticed the thunk, the worse the bump the louder the thunk. Googled and found many posts and a few videos. Remedied using some 1/4" thick foam insulating strip (adhesive on one side), placing across the existing foam padding and across where the screws come through (punching a small hole for the screws). Adds just enough gap when compressed once the screws are tightened. It eliminated about 95% of the thunk, only the worse bumps would thunk and only a little.
2) Curious about removing all thunk, purchased some 5/16" washers at home depot. Installed two washers as described online (one for each screw). The thunk was entirely gone, but at speed I now had a persistent (and annoying) whistling sound. Removed the washers and the thunk reappeared but the whistling sound went away.
3) Reapplied strip foam from #1, thunk is again mostly gone and no whistling. Man those tolerances are razor thin.
4) Also need to mention I've done the bump stops as outlined in the prior video, but doing that alone doesn't stop the thunk.
I think the upper plastic piece on the 2021 model hatch isn't the exact same as prior years, it seems to have plastic around the screw hole that protrudes up when compared to other pictures I've seen, specifically the washer nestling into the foam around it in a way my washers cannot. Attached is a side-profile pic of my top plastic part. Adding a washer pushes this piece down too far and creates a gap for wind to intrude, creating the whistling. Foam compresses enough to be thinner than the washer, but thick enough to force the plastic pieces together/no thunk.
Maybe this will be helpful to others trying to fix this. IMO this problem shouldn't exist, but it's really my only complaint thus far with the car.
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