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1976 280Z Restoration Project


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Finally got the 280Z up on the lift and did a mechanical inspection... couldn't resist taking some pictures too!

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I hope you plan on dyno testing that thing ! 
Your car looks fantastic . Very nice work . 
Without going thru the whole thread , does this thread show how you did your fusible links ? My buddy getting ready to do a Megasquirt on his 78 , which is much different than my 71. 

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The 78 is a little different but the premise is the same. All the fusible links start with a hot from battery positive. I took a fuse block and fed each circuit to one of the fuses from the hot common. I also added relays for the headlights, horn and starter to keep current out of the dash.

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So I did a quick spin around the block and was quite dismayed to hear a rotational clunk in the rear end. Not the load/shift clunk experience by most. 
I pulled the diff and tested the pinion torque, preload and bearing cap torque. All good. Tested the swipe pattern (with Kopr Kote, no it’s not rust!) and that was good in both directions. Backlash seems spot on. 
 

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After that, I inspected all the u joints and all the rear suspension bolts. All good and tight. Then I checked the alignment of the driveshaft and discovered the diff nose was off centre by almost 1/2” side to side. Realigned the diff tonight and checked with a laser to get it as close to perfect alignment with the trans output shaft. 
The driveshaft is a custom 4” aluminum unit with GM ujoints and has been balanced when built. 
 

frickin’ lasers!

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5 hours ago, wheee! said:

quick spin around the block and was quite dismayed to hear a rotational clunk in the rear end.

Some noise in the diff is normal..  In the '70's people who had a 240z sayd, it's normal to hear a whine in the rear, i would worry when one day i would'nt hear it!  

My just restored 280zx has also a bit of noise but it's not very loud and it's probably due to the rubbers in the diff to chassis connection.

I get that your diff makes a bit more noise than normal, hope you get it right, just wanted to say that a bit is normal.

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28 minutes ago, Pilgrim said:

So, @Wheee!

How did you re-center it?  Move the mount or change it somehow?  I can't visualize how you achieved that. 

Some black magic! Seriously though, I adjusted the top GM style mount on the RT Mount to recentre the diff. There are two holes for positioning about 1/2" apart. I moved it one over. I also shimmed the driver side of the RT mount against the tunnel to allow the slightly narrower mount to sit centred in the tunnel. To offset the slight shift, I added a washer to the back mounting lugs on the driver side to make the diff sit flat and flush to the moustache bar.

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Verified the driveshaft has the preferred “droop” to keep the u joints working properly. 
Trans output is level, then checked the diff and it is level, then checked the driveshaft and there is about 2.5 degrees of drop down along the shaft to the diff. Very close to the “magic” 3 degrees!

 

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  • 2 weeks later...

Well, the rotational clunk is gone!! All the lasers actually helped. Still some little gremlins to sort like the speedo decided to stop working and now my power steering thinks I’m stopped and it’s on full power assist all the time..! Easy fix. 
Weather is crap this weekend so I will try and get a good pull down the road next week and send the data log to the tuner for evaluation.

Onward!

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  • 1 month later...
Your passion for good work has paid off! Damn fine car. Can't wait for the zcon I get to see it in person.
 

wouldn’t that be nice?!
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Can you pass on what size wheels and tires you chose with the offset info? Thank you. Car is Beautiful!!

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That's a nice reward for all those hours spent on the restoration.  Perhaps it's time for you to re-post a picture of what the car looked like when you started...

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Edited by Namerow
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Half of that sheet metal was replaced... new fenders, cowl cover, floors, frames, nacelles and under-bumper panel..... ugh!

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  • 3 weeks later...

Installed the Techno Versions V Boost tach adapter last night. The ebay version, although functioning, tended to jump around a lot. The V Boost version has enough power to smooth the signal totally out! 
Still waiting on the replacement fuel pump. The stock unit can’t feed the volume anymore and is leaning out under load. Ordered a Walbro in line unit to replace it. This should also get rid of the pump noise that was driving me nuts. 

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