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PostPosted: Thu Aug 24, 2017 1:00 pm 
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With my issue, all things point to flat spots on the tyres.
I haven't replaced them just yet as there are other items I am working on.
If you haven't purchased a dial gauge, now is the time. Check everything for run-out.
What kind of speed does yours occur?

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1972 Datsun 1600, S14 SR20DET Engineered (190-210kw @ 15-16psi.)
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PostPosted: Fri Aug 25, 2017 4:26 am 
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Around 70-80 mph here in the States. Going to swap my Whiteline bushings top to bottom and get the thick one on top. BTW, is your diff angling down or up? Or in other words, is it lower in the front or back?


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PostPosted: Fri Aug 25, 2017 3:08 pm 
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Mine has a slight vibration at that speed also. It's less of an issue In 4th gear compared to 5th. So i think mine has something to do with engine harmonics. Mine just vibrates the rear view mirror and that's about it.
I've changed diff and engine/ gearbox angles significantly in my car and it made no difference.

Did you swap your wheels front to back Nik? Any change?

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Ongoing Project: 1972 Datsun 510 S13 SR20Det. http://ozdat.com/forum/viewtopic.php?f=33&t=17898
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PostPosted: Fri Aug 25, 2017 3:27 pm 
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Ross, what ratio diff are you running?
I haven't had a chance to swap wheels from front to back and test. I haven't taken the car for any long high speed drives recently. It's been mainly driving around town at or under 100km/h which doesn't seem to have any issues. I did make up some spacers on the rear moustache bar out of aluminium to try and get the driveline angle better aligned (i'm now within the 3deg requirement for smoothness).
I have a few other things I'm going to try as well, but will keep working on getting this thing track ready in the small spurts of time I have available...

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http://www.ozdat.com/forum/viewtopic.php?t=6579
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PostPosted: Mon Aug 28, 2017 11:49 am 
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I had a 3.54 in it originally as an R180 with Standard axles.
Then swapped to a 3.9 R200 with cv's. But that diff is busted on the drive side of the gearset.
So now I'm about to fit a 4.44 R180 with my cv's.
I noticed more vibration with my R200 than my R180 despite the cv's. But i did notice that the cv angle is different with the r200 compared to the r180. They're slightly in front of the wheel at the diff end so they're not straight.
I'll fit the new diff and ill report back.

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Ongoing Project: 1972 Datsun 510 S13 SR20Det. http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18


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PostPosted: Mon Aug 28, 2017 1:27 pm 
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It will be interesting to know how you go with the R180 instead of the R200.
The angle of the CV joints shouldn't make too much difference I would have thought. After all they are designed to go through suspension travel too.
When do you think you will be fitting the R180?

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http://www.ozdat.com/forum/viewtopic.php?t=6579
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PostPosted: Mon Aug 28, 2017 2:40 pm 
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Yes I agree.
I do know that the r200 sat lower than my R180 because of the bolts hitting the rear brace. I've never really looked at the angles too intently but i suspected that it was probably the uni joints more than anything else.

I'll probably fit up the new diff this weekend.

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Ongoing Project: 1972 Datsun 510 S13 SR20Det. http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18


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