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For those of us who are not as versed at this, are you thinking the axle was causing vibrations as well that you were attributing to the driveshaft?
Yeah, I think that the current vibration is from the excessive runout in that axle shaft. I'm spitballing a bit here, but the stages I think I've gone through causing the vibration since the Getrag swap are:
1. Excessive runout in the supplied driveshaft and mild runout from the driveshaft adapters not being centered
2. Supplied driveshaft replaced. Runout due to the new driveshaft not perfectly self-centering on the adapters, and the adapters still not being centered either.
3. Centered the adapters and driveshaft better (not perfect, though). Current vibration due to the wobbly axle. Believe this axle has been contributing to the vibration the whole time.
I messaged KPI only 30 minutes before they closed so will have to talk to them tomorrow. I'll probably call them on my way to work in the morning. In the meantime, for science, I'm going to throw a couple more hose clamps on the axle in question to counter the wobble and see if any difference can be felt. There's a chance I won't be able to add enough weight to offset the wobble. If I'm lucky, though, maybe I'll be able to lessen the vibration just a bit, confirming the axle is the issue.
It's insane that the driveshaft adapters don't use some sort of centering mechanism like every single OE driveshaft does, or if it does it's clearly not properly machined.
It's insane that the driveshaft adapters don't use some sort of centering mechanism like every single OE driveshaft does, or if it does it's clearly not properly machined.
The driveshaft and adapters all have self-centering mechanisms... but every single one has some free play between it and the next component. Play between the pilot shafts on the trans/diff and adapters, play between the driveshaft flanges and the adapters. I've got the front driveshaft flange and adapter close to being perfectly centered but they still need some adjustment...
Brilliance with the wheel weights. That's better than what I've got going on right now lol. I think I'm maxed out on the amount of weight I can offset via hose clamps. I added these two at a time and it was hard to tell if any difference was made. I gotta pull them all off and test the vibration back to back.
That being said, the vibration at this point is probably the best it's been since I put the ZF in the car. It starts coming on above 3k in 6th gear, lower than it did with the Miata diff w/ rubber bushings, but doesn't get quite as severe as it did with any of my numerous setup iterations using the Miata diff. If I could reduce the magnitude by the same amount again, I'd probably be comfortable tracking the car. I'm gonna have to get the car in a lift again this week and d*ck with the driveshaft positioning again, in addition to getting this axle replaced. We're getting closer at least.
Yesterday, 07:05 PM
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