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The Z31 Project - Race Car


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#101 260DET

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Posted 24 April 2017 - 08:06 AM

A problem to be solved before going further with the Powerglide Gear Vendors combo, the GV shifts electronically, the glide mechanically. Apparently it's possible to convert the glide's valve body to electronic shift but the US supplier won't talk to me, it should not be that difficult though if I can get hold of the right bloke here, need engine braking too. If that can be done then the next thing is to get a electronic setup for driver controlled shifts, probably going to go with a paddle shift arrangement rather than a floor bump shift like the 280ZX has. Have found a promising device that is primarily for driver controlled shifting rather than the usual more expensive devices which are multifunctional.

 

All the above is so that shifting is made to be as simple as possible with an OE type mechanical shifter on the floor for PNR only. All this to save 50kg and reduce parasitic loss but if it all works properly then it's going to be a damn good setup for circuit racing.



#102 260DET

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Posted 28 April 2017 - 11:53 AM

Whoohoo, I'm excited  ^-^  The left side rear suspension is complete, a bit more welding etc but it's bolted in with all the angles and dimensions from the chosen suspension programme setup in place and correct. So now the car can be rolled over to get access to the right side so it can be done.

 

Of course there are pics, two pics which I hope are self explanatory but note that the two lateral control arms are shiny aluminium and that there is a mutual supporting (blue) brace going from the upper inner pivot to the lower inner at the bottom of the diff, static roll centre is right there too but it's invisible  ;)

 

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Edited by 260DET, 29 April 2017 - 10:12 AM.


#103 CBR Jeff

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Posted 29 April 2017 - 06:28 PM

Richard I am looking forward to seeing how this works out.

Jeff
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#104 260DET

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Posted 31 May 2017 - 05:41 PM

It's hard to believe but after all the calculating, all the design work, all the fabrication it looks like the diff and suspension is ready to be fitted permanently, except that the springs have not arrived yet. So the diff has been mounted including a last minute addition, a torque arm. Two reasons for that, firstly to help accomodate the extra load from two lateral suspension arm pivot brackets, secondly to take load off the diff cover which can crack. Pic shows pretty well everything except the front bearing lube mod which is hidden inside the front diff mount.

 

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#105 260DET

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Posted 07 June 2017 - 04:07 PM

Koya 18x10 wheels arrived, nondescript black but it's a pleasant change to get something that bolts straight on without requiring any attention.

 

 

 

 

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#106 Lurch ™

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Posted 07 June 2017 - 09:16 PM

post-101215-0-61429200-1496815565.jpg

 

I thought you weren't allowed to drink liquids after 4pm?



#107 dat2kman

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Posted 08 June 2017 - 08:37 AM

post-101215-0-61429200-1496815565.jpg
 
I thought you weren't allowed to drink liquids after 4pm?

"Nil by mouth" is what the nurses write.

#108 260DET

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Posted 08 June 2017 - 09:03 AM

lol coincidentally I was thinking that a can would look better but they are/were all full, as in full of liquid and full strength.



#109 260DET

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Posted 08 June 2017 - 10:37 AM

Oh and Lurch/Chook, I was once young and smart arse too, now I'm still a smart arse but one who knows more.



#110 260DET

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Posted 08 June 2017 - 05:50 PM

Moving right along from the chit chat, one side of the rear suspension is all bolted up and best of all looks like it will be a goer. By that I mean that the various specs like toe, camber, ride height and track look to be within adjustment and axle range which is a hell of a relief with a suspension dimensioned using tools like a tape, ruler, level and so on found in your average diy workshop. Pics should be self explanatory, note cool green coilovers with yellow King springs, the 10" wide wheels fit in easy as, about flush with the outer guard. Could fit 11" wides in there but with 275 wide semis the widest available there is no point.

 

DSCN0396.JPG DSCN0397.JPG DSCN0398.JPG DSCN0400.JPG  

 

EDIT: Six rod ends each side, total of 12 :) including one at the bottom of each coilover which was converted from rubber bush type. All cro-mo, not that expensive if you shop around.


Edited by 260DET, 09 June 2017 - 08:44 AM.

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#111 260DET

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Posted 28 June 2017 - 01:32 PM

Have collected some more stuff, pics below, the two main Shift parts are an electric transmission shifting mechanism which on command changes the Powerglide in to R or 1 or P or whatever and the controller which is push button as delivered but which will be modified to change in to 1 and 2 by a lever operated switch of some sort. The other bits are adjustable front wheel bearing spacers, no shims or turning on a lathe required. The instructions require the adjustment to be done using dry bearings with a touch of preload  :P

 

DSCN0401.JPG DSCN0403.JPG

 

 



#112 dat2kman

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Posted 28 June 2017 - 05:51 PM

One piece, somewhat more substantial, larger shoulder dimensions, greater load bearing capability.
Couple of hours to knock up, and then fit with correct preload, using a lathe.

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#113 Cozza

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Posted 28 June 2017 - 06:22 PM

Hey Richard, those bearing spacers look interesting. Can you post a link to the supplier please.

#114 260DET

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Posted 29 June 2017 - 08:14 AM

Wheel spacer source here http://store.drpperf...justable-steel/



#115 Cozza

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Posted 29 June 2017 - 07:46 PM

They look good. Still a bit of messing around to fit but seeem to be reusable if/when you replace your bearings. Do you have to get them to suit the specific stub axle? Website seems to be "1 size fits all"?

#116 260DET

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Posted 30 June 2017 - 08:53 AM

The linked Legends spacer is the one I have and also apparently fits the S30. Scroll down to see the video which shows adjustment procedure, adjusting the bearings dry (without grease) makes sense and will improve rigidity compared with using greased bearings. As I've said before, using the factory adjustment procedure is obviously not the best way for a race car where you want to keep those front wheels from flexing around the bearings when cornering.



#117 260DET

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Posted 11 July 2017 - 07:00 PM

Front struts and wheel bearing hubs have been done with new seals, bearings and spacers. The spacers had to be adjusted, see previous posts, but that was no problem, the seals did add a lot of drag though so there may be something to be gained in using low drag seals. Build is moving slowly lately, a lot of little things and interruptions. Pic of one strut below, note the race spec holes and the gusset across from the strut to the axle body.

 

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#118 260DET

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Posted 18 July 2017 - 03:12 PM

Fuel system is done at last and it's a bit different to the usual race car setup. The cell is partly filled with foam which sits on top of a silly expensive Holley fuel mat, from there fuel runs by gravity to the EFI pump and from there to the engine bay fuel filter via a new aluminium fuel line. The pump outlet is T pieced to a pressure regulator which returns excess fuel to the tank. And that's it. In the pic, fuel cell at the extreme left, pressure regulator on the extreme right with the braided return hose running along the top back to the fuel cell. Really needs a close up pic of the EFI pump and regulator too (edit: done)

 

So now the car can come off the rotisserie, yay, another mile stone.

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Edited by 260DET, 18 July 2017 - 03:21 PM.


#119 PZG302

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Posted 20 July 2017 - 12:30 PM

Why only partial fill of the tank with foam???

 

I would have filled all the tank as a safety thing. Especially after I had a fairly big shunt at Oran Park where the fuel tank was ripped from the mounts, and even with a full tank of fuel foam a few litres were still sprayed over the back of the car as the filler neck was ripped from the tank. Having the foam in the tank in that crash certainly prevented a much worse incident from happening.



#120 260DET

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Posted 20 July 2017 - 05:30 PM

With this car the cell is well forward and central so it's going to take a big crash to reach it, filling the tank with foam would have been better but it does have roll over valves on both the vent and filler. It's a hell of a lot safer setup compared with the stock tank in the 280ZX plus all the extra fuel lines required with a swirl pot, pickup pump and return fuel system. And the fuel mat acts as a filter so the only real filter it needs is one EFI filter in the engine bay.


Edited by 260DET, 21 July 2017 - 08:04 AM.





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