TLDR: Trying to get rid of some NVH.
Sorry if this is too long for some, but I’m out of ideas.
The car has had revshift polyurethane engine and transmission mounts (80A) for a few years now, probably around 20-25k miles and it developed a vibration from around 2500-3000rpm, then would go away past around 3250rpm. I dropped the transmission crossmember and mounts thinking they were the problem, tightened both the trans and engine mounts, big mistake, vibration got worse and throughout the entire rev range. I replaced the poly trans mounts with some “oem esk” trans mounts off of fcp, they’re an oem style but supposedly slightly stiffer. The vibration in the lower part of the rev range is completely gone, but now vibrates from 4500-5000rpm then completely goes away and the car drives smooth as butter. I don’t think the culprit is a moving part as it happens when the car is stationary and moving, clutch in or out, and I’ve replaced the guibo already. Subframe has been reinforced, currently have delrin subframe and diff mounts. Running out of ideas.
Sorry if this is too long for some, but I’m out of ideas.
The car has had revshift polyurethane engine and transmission mounts (80A) for a few years now, probably around 20-25k miles and it developed a vibration from around 2500-3000rpm, then would go away past around 3250rpm. I dropped the transmission crossmember and mounts thinking they were the problem, tightened both the trans and engine mounts, big mistake, vibration got worse and throughout the entire rev range. I replaced the poly trans mounts with some “oem esk” trans mounts off of fcp, they’re an oem style but supposedly slightly stiffer. The vibration in the lower part of the rev range is completely gone, but now vibrates from 4500-5000rpm then completely goes away and the car drives smooth as butter. I don’t think the culprit is a moving part as it happens when the car is stationary and moving, clutch in or out, and I’ve replaced the guibo already. Subframe has been reinforced, currently have delrin subframe and diff mounts. Running out of ideas.
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