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Rear Tri Bar Strut Brace For A 2+2 Racing Bus


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#1 grimlynsan

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Posted 22 September 2015 - 08:41 AM

Gents,

 

I am looking to get a rear tri bar strut brace. Like this one:

 z_tri_3.jpg

 

Trouble is, I have a 2+2 ‘Racing bus’ 260z (1977).

 

No one specifically makes race parts for these, which is in itself a travesty since the 2+2 was designed for the true zed racer, one who needs to bring his pit crew with him to meets!

 

Anyway, can anyone make comments as to:

  • Is the shape of the rear strut top where the brace connects the same in a 2+2 as for a normal late model 260z/280z?
  • Is the distance between them the same?
  • Are they the same height from the boot floor?

It would be great to get some definitive answers to this as I’m sure there are other bus drivers out there wondering!

 

I have tried searching but it is difficult to narrow results down to include '2+2' as there are '2's on nearly every page!

 

Thanks fellas – your counsel is always appreciated!

 

Lee



#2 Retro Z

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Posted 22 September 2015 - 11:52 AM

You can use a adjustable brace for a Late model 2 seater 260z (with higher strut towers). Not sure if the tri-bar will work though 


Edited by Retro Z, 22 September 2015 - 12:27 PM.


#3 dat2kman

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Posted 22 September 2015 - 12:04 PM

Just se the regular top bar. It will reduce body shell flex between the towers ( assuming no cage tagged to body shell?) by around 2mm

Have you tried fitting/using strain guages at various vector points around this area to then be able to record dynamic data when car s under stress?
The SEA boys do this stuff all the time with their SAE Formula Cars, very interesting, they work out just what to construct the cars with!

The other pissibility is FEA ( Finite Element Analysis) on all structural parts of the car, uncaged then caged.

After all, we are talking Race Cars, it all helps,,,,,,

#4 grimlynsan

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Posted 22 September 2015 - 12:13 PM

Interesting but doesn't answer any of my questions...

#5 MATTY

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Posted 22 September 2015 - 01:29 PM

FYI with the rear strut brace when i fitted mine to my 2+0 i had to take the lock adjustment nuts off to get the brace to fit between the strut tops jsut needed that extra 5 mm where the nuts sat flush on the rear brace it's self (if that makes sense?). Might have twisted and moved over the years i guess.

 

Might be best to email the boys at T3 and see if they can offer you advice on the tri-bar set up to suit the 2+2's. if not you can buy it and if it doesn't fit i'll but the tri-bar add on off you :P

 

Cheers

Matty



#6 MATTY

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Posted 22 September 2015 - 01:31 PM

Interesting but doesn't answer any of my questions...

Isnt Lurch buliding/restoring a 2+2?? he seems to know his stuff too....



#7 grimlynsan

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Posted 22 September 2015 - 01:41 PM

I emailed T3 and they said they weren't sure if it would fit, but they emailed me a diagram with measurements for me to fill in. I aim to do this tonight with the help of a measuring stick and some beers.

 

So what I understand from these replies so far is that:

 

The bolt pattern is most likely the same

The distance between the struts is likely the same as any late 260z

The struts themselves are taller than a 240 (so I'd need longer 'tri' bars).

 

This being the case, the top part should fit.

 

And if the bottom 'tri-bar' parts don't fit, Matty will buy them off me :-)

 

Good so far?



#8 grimlynsan

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Posted 22 September 2015 - 01:57 PM

 I aim to do this tonight with the help of a measuring stick and some beers.

 

 

Errrrr just realised my car is at the shop and I can't do this... And they are holding my order until I send them the measurements...

 

Does anyone (Lurch!?) have a 2+2 they wouldn't mind measuring?



#9 MATTY

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Posted 22 September 2015 - 03:26 PM

I emailed T3 and they said they weren't sure if it would fit, but they emailed me a diagram with measurements for me to fill in. I aim to do this tonight with the help of a measuring stick and some beers.

 

So what I understand from these replies so far is that:

 

The bolt pattern is most likely the same

The distance between the struts is likely the same as any late 260z

The struts themselves are taller than a 240 (so I'd need longer 'tri' bars).

 

This being the case, the top part should fit.

 

And if the bottom 'tri-bar' parts don't fit, Matty will buy them off me :-)

 

Good so far?

 

Pretty much mate. 8)

 

by memory T3 offer the longer bars for the tri bar set up now?


Edited by MATTY, 22 September 2015 - 03:31 PM.


#10 peter t

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Posted 22 September 2015 - 03:30 PM

You could check out mine Lee as that looks like a TTT brace. and yes the distance between towers is the same.
Peter. I wouldn't worry about the cross braces as the strut brace alone made a big difference to my car. You can try it if you want as only takes two secs to take off and replace.

Edited by peter t, 22 September 2015 - 03:35 PM.


#11 MATTY

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Posted 22 September 2015 - 03:35 PM

You could check out mine Lee as that looks like a TTT brace. and yes the distance between towers is the same.

Peter.

you dont have the tri bar section peter do you? cause if you need to measure the length of  between the 2+2 strut bar compared to mine i can measure my t3 on for comparison if that helps



#12 Gareth. J.

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Posted 22 September 2015 - 03:43 PM

The bolt/stud pattern is the same also as all strut tops are interchangeable.

If you find yourself short just buy a few longer rose joints or bolts for the diagonal bars. Perhaps they can do it a little cheaper if you give feedback and pictures of a 2+2 install.

EDIT. Can't they tell you how much more adjustment you'll get height wise when the diagonals are maxed out? That should tell you if it will fit without fiddling around.

Edited by Gareth. J., 22 September 2015 - 03:59 PM.


#13 grimlynsan

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Posted 22 September 2015 - 03:57 PM

So far I am encouraged by these responses!

 

So the top bar will fit, and it seems the tri bars MAY fit however from what is being said is sounds like I will need longer tri-bars than would suit a 240z, on account of the strut towers being taller.

 

Peter, do you have the T3 branded strut brace?

 

If so, would you mind taking a measurement from the center of the mounting hole to the center of the floor (as per the pic at the top) so that I can tell T3 to just make me some bars that size? (sorry Matty!).

 

Also, does anyone know how the bottom bracket (the blue bit) attaches to the floor? I'd check myself but don't have access to my Z at the moment.

 

I assume if there are some holes already there on a 240z it would be unlikely I'd have the same ones on my 2+2 and I'll probably have to drill them myself. Anyone know?

 

Thanks again all for your contributions, can't wait to post some pics of everything installed!

 

Oh, and has anyone used the T3 C Pillar Support as per this pic and link and any ideas if a 2+2 has the same mounts?

z_c_pillar.jpg

https://technotoytun.../z-c-pillar-bar



#14 MATTY

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Posted 22 September 2015 - 04:08 PM

So far I am encouraged by these responses!

 

So the top bar will fit, and it seems the tri bars MAY fit however from what is being said is sounds like I will need longer tri-bars than would suit a 240z, on account of the strut towers being taller.

 

Peter, do you have the T3 branded strut brace?

 

If so, would you mind taking a measurement from the center of the mounting hole to the center of the floor (as per the pic at the top) so that I can tell T3 to just make me some bars that size? (sorry Matty!).

 

Also, does anyone know how the bottom bracket (the blue bit) attaches to the floor? I'd check myself but don't have access to my Z at the moment.

 

I assume if there are some holes already there on a 240z it would be unlikely I'd have the same ones on my 2+2 and I'll probably have to drill them myself. Anyone know?

 

Thanks again all for your contributions, can't wait to post some pics of everything installed!

 

Oh, and has anyone used the T3 C Pillar Support as per this pic and link and any ideas if a 2+2 has the same mounts?

z_c_pillar.jpg

https://technotoytun.../z-c-pillar-bar

 

Ah bugger i'll have to buy a tri bar my self! haha

 

I have the C pilar brace too bud, i would have a felling it wouldnt fit given the shape of the roofline and the mounting points for the seat belts (it was a  BIG pain in the A$$ to fit by your self too) but if you need any measurements of the C pillar bar its self i can help out.

 

as for the tri bar it  gets fixed to the floor. as i know i cant find ant pre-existing mounting holes. i assume they would supply you with a few stainless bolts to mount it to the floor after you have drilled a few holes in the floor now that is


Edited by MATTY, 22 September 2015 - 04:11 PM.


#15 peter t

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Posted 22 September 2015 - 04:14 PM

Lee mines a TTT and as you can see the mounts are different to the tri brace so where to measure. As far as the floor goes just drill. Not sure what the pillar brace would do to the overall scheme of things but really cant see any advantage of it.
Peter.

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#16 dat2kman

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Posted 22 September 2015 - 04:19 PM

You can never have enough bits of metal, it all hels keep the car closer to the ground, with all the extra weight.

#17 MATTY

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Posted 22 September 2015 - 04:22 PM

Lee mines a TTT and as you can see the mounts are different to the tri brace so where to measure. As far as the floor goes just drill. Not sure what the pillar brace would do to the overall scheme of things but really cant see any advantage of it.
Peter.

yours appears to be a older version Peter. as the style i have are the blue ones and they look like a longer finger off the plate from the strut top? i could be wrong but i though it might be worth a mention.



#18 grimlynsan

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Posted 22 September 2015 - 04:24 PM

Hey Matty you're not out of luck yet - it may not fit!

 

Peter, thanks - I see they must have changed the design.

 

Jason, what can I say? enlightening as always ;-)

 

All I can think to do, is apply some geometry calculations.

 

If peter can let me know the height of the strut top from the floor, and a 240z owner can let me know the height of their strut top from the floor, I can surely use some SOH CAH TOA, along with the distance between the strut tops, to calculate how much 'additional length' the tri bars would need...

 

Would that work?



#19 peter t

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Posted 22 September 2015 - 04:38 PM

I have both S30 and GS30 measurements in my book. give me two secs and I will check.



#20 peter t

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Posted 22 September 2015 - 04:42 PM

Looks like both the same.






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