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> BUILD-OFF CHALLENGE: Tygaboy's '75 LS3, It seemed a good idea at the time...
tygaboy
post Feb 20 2020, 04:06 PM
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QUOTE(Cairo94507 @ Feb 20 2020, 01:31 PM) *


@Cairo94507 - Thanks Michael, you are too kind...
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tygaboy
post Feb 20 2020, 07:58 PM
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QUOTE(Andyrew @ Feb 20 2020, 01:31 PM) *

Wow thats a major design change! Gives it more of a sleeper look than an outlaw or 916 look.

Certainly be much faster than making a roof! Im curious. Are you going to make a couple of wind holes in the rear of the top to allow for some pressure relief while the windows are down?

I've always wondered if people with GOOD seals had that issue.


@Andyrew - You mean for when I'm doing 135 with the windows down? (IMG:style_emoticons/default/poke.gif)

I think that as well as bonding the roof on, I'll also take advantage of where the rear latches bolt on to have a bracket welded to the roof that bolts to those locations.
Remember, the front of the roof has a big lip that tucks into the back of the windshield frame so no chance of the front lifting.
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914forme
post Feb 21 2020, 11:05 AM
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@Tygboy Chris you ever think about sectioning two tops and then bonding them to the inner structure. That extra 1/4" or so would not be noticed by most, and would look completely stealth.

I sent you a PM on th trade.
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Andyrew
post Feb 21 2020, 01:38 PM
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QUOTE(tygaboy @ Feb 20 2020, 05:58 PM) *

QUOTE(Andyrew @ Feb 20 2020, 01:31 PM) *

Wow thats a major design change! Gives it more of a sleeper look than an outlaw or 916 look.

Certainly be much faster than making a roof! Im curious. Are you going to make a couple of wind holes in the rear of the top to allow for some pressure relief while the windows are down?

I've always wondered if people with GOOD seals had that issue.


@Andyrew - You mean for when I'm doing 135 with the windows down? (IMG:style_emoticons/default/poke.gif)

I think that as well as bonding the roof on, I'll also take advantage of where the rear latches bolt on to have a bracket welded to the roof that bolts to those locations.
Remember, the front of the roof has a big lip that tucks into the back of the windshield frame so no chance of the front lifting.


135 comes pretty quick at that power level.... (IMG:style_emoticons/default/blink.gif)

Most of the time when Im taking the 914 out I have the top off, so I dont really notice much above 120.

Im just thinking of path of air travel. Buffeting is certainly an issue with most cars. Might be something fun to test later on (IMG:style_emoticons/default/smile.gif)
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tygaboy
post Feb 21 2020, 04:56 PM
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Here's the other end of the "attentive observer" item: this shows the change in the roof's rear overhang, given the shift forward due to the missing front seal.

I was worried it might be too obvious and look wonky but I think this will work fine.

@914forme - I can live with this and forgo the sectioning of the roof! That would be a bunch of work...


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Andyrew
post Feb 21 2020, 05:09 PM
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QUOTE(tygaboy @ Feb 21 2020, 02:56 PM) *

Here's the other end of the "attentive observer" item: this shows the change in the roof's rear overhang, given the shift forward due to the missing front seal.

I was worried it might be too obvious and look wonky but I think this will work fine.

@914forme - I can live with this and forgo the sectioning of the roof! That would be a bunch of work...


Looks better than stock IMHO
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Krieger
post Feb 21 2020, 06:49 PM
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QUOTE(Andyrew @ Feb 21 2020, 03:09 PM) *

QUOTE(tygaboy @ Feb 21 2020, 02:56 PM) *

Here's the other end of the "attentive observer" item: this shows the change in the roof's rear overhang, given the shift forward due to the missing front seal.

I was worried it might be too obvious and look wonky but I think this will work fine.

@914forme - I can live with this and forgo the sectioning of the roof! That would be a bunch of work...


Looks better than stock IMHO


(IMG:style_emoticons/default/agree.gif)
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914forme
post Feb 21 2020, 08:33 PM
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(IMG:style_emoticons/default/agree.gif) maybe we should all be cutting ours down.
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tygaboy
post Feb 22 2020, 03:36 PM
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A bit of roll bending, measuring as carefully as possible, notching and fitting.

I'm currently doing this work by myself so having the car on the rotisserie makes a HUGE difference. It would have been WAY more difficult without it.

And remember, the rear end of those side rail bars is notched. This pic makes it look like they're sitting fully on top of the targa bar.


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tygaboy
post Feb 22 2020, 03:38 PM
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You couldn't really see the roll bend in that last pic. Here it is with the roof on and you can see the bar tucks nicely up into the curve of the roof. I shouldn't have any interference issues but I'll test sit/fit ahead of welding anything in.

Worst case, I can use a bit smaller diameter tubing and/or offset the notch to move the bar up til it just touches the roof.


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Andyrew
post Feb 22 2020, 04:05 PM
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Make sure to wear your helmet (IMG:style_emoticons/default/smile.gif)

Mine just about touches the roof...
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sixnotfour
post Feb 22 2020, 04:26 PM
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I took my trim off, shortened the roof 1 inch, and re contoured the back edge, adding a curve...redrum


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horizontally-opposed
post Feb 22 2020, 04:49 PM
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Good to see you this week, Chris!

As usual, your fab work looks fab. Thing is, this setup—while undoubtedly strong—has me worried about your safety. Wouldn't take much give in a set of seatbelts for a skull to connect with that steel bar—and I don't think it would take all that much to seriously stiffen the 914 via this concept. Would flat bars or something similar work? Or maybe a bar across the windshield header and a single or double bar in the center of the top? Just thinking out loud while you are at this point (so feel free to ignore!).

Best,

(IMG:style_emoticons/default/beerchug.gif)
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sixnotfour
post Feb 22 2020, 05:17 PM
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Armando's, Gt roof


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horizontally-opposed
post Feb 22 2020, 05:30 PM
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QUOTE(sixnotfour @ Feb 22 2020, 03:17 PM) *

Armando's, Gt roof


That's the way the factory racing department did it, and one wonders what could be accomplished with modern materials.
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tygaboy
post Feb 23 2020, 04:03 PM
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QUOTE(horizontally-opposed @ Feb 22 2020, 02:49 PM) *

Good to see you this week, Chris!

As usual, your fab work looks fab. Thing is, this setup—while undoubtedly strong—has me worried about your safety. Wouldn't take much give in a set of seatbelts for a skull to connect with that steel bar—and I don't think it would take all that much to seriously stiffen the 914 via this concept. Would flat bars or something similar work? Or maybe a bar across the windshield header and a single or double bar in the center of the top? Just thinking out loud while you are at this point (so feel free to ignore!).

Best,

(IMG:style_emoticons/default/beerchug.gif)


@horizontally-opposed - Hi Pete. The pics make the bar look lower than it is, but I agree: I'd prefer as much room as I can get up there.

So today, I took an initial swing at fabbing the X-brace out of sheet metal. This one is certainly going to end up as a "practice/learning" piece and is another example of how I need to physically work with the part and see it in the car before I actually understand what I'm hoping to do! (IMG:style_emoticons/default/laugh.gif)

It's 18 ga with a 1/2" lip. The holes are where I'll add the speed holes/dimples.

This piece would end up being welded to the bars at the corners and bonded/riveted to the roof as shown in my awesome graphic, below. In the end, this extends only 1/2" below the inside of the roof. Plenty of room and essentially no risk of a head bonk.


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horizontally-opposed
post Feb 23 2020, 04:17 PM
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QUOTE(tygaboy @ Feb 23 2020, 02:03 PM) *

QUOTE(horizontally-opposed @ Feb 22 2020, 02:49 PM) *

Good to see you this week, Chris!

As usual, your fab work looks fab. Thing is, this setup—while undoubtedly strong—has me worried about your safety. Wouldn't take much give in a set of seatbelts for a skull to connect with that steel bar—and I don't think it would take all that much to seriously stiffen the 914 via this concept. Would flat bars or something similar work? Or maybe a bar across the windshield header and a single or double bar in the center of the top? Just thinking out loud while you are at this point (so feel free to ignore!).

Best,

(IMG:style_emoticons/default/beerchug.gif)


@horizontally-opposed - Hi Pete. The pics make the bar look lower than it is, but I agree: I'd prefer as much room as I can get up there.

So today, I took an initial swing at fabbing the X-brace out of sheet metal. This one is certainly going to end up as a "practice/learning" piece and is another example of how I need to physically work with the part and see it in the car before I actually understand what I'm hoping to do! (IMG:style_emoticons/default/laugh.gif)

It's 18 ga with a 1/2" lip. The holes are where I'll add the speed holes/dimples.

This piece would end up being welded to the bars at the corners and bonded/riveted to the roof as shown in my awesome graphic, below. In the end, this extends only 1/2" below the inside of the roof. Plenty of room and essentially no risk of a head bonk.


Nice work! (IMG:style_emoticons/default/smilie_pokal.gif)

That looks a lot safer, and it's a nice modernization of the factory design, too, which Roland Kussmaul says was extremely effective. Next challenge: Possible to round the lower edges of those beams, and maybe add a bit of hard foam and maybe even vinyl? (IMG:style_emoticons/default/happy11.gif)

All in love, brother!

(IMG:style_emoticons/default/beerchug.gif)
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live free & drive
post Feb 23 2020, 05:55 PM
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Anyway you could de-skin a Frunk lid and a trunk lid and section and piece together a viable/factory looking support using the factory stamped reinforcement channels?
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tygaboy
post Feb 23 2020, 06:28 PM
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QUOTE(live free & drive @ Feb 23 2020, 03:55 PM) *

Anyway you could de-skin a Frunk lid and a trunk lid and section and piece together a viable/factory looking support using the factory stamped reinforcement channels?


@live free & drive - Now that is an interesting idea... (IMG:style_emoticons/default/idea.gif) Plus, I suspect the curvature would be very close, if not just right.

I'll have to check that out and I just may take you up on your suggestion if my current plans don't work out.
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tygaboy
post Feb 23 2020, 06:33 PM
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I quickly gave up on trying to make the X-brace from one piece. Bending the flanges was really time consuming and didn't work as well as I'd have hoped, particularly in the corners of the X. There would be a bit of welding and metal finishing, just to make it look OK in that area. In the end, I think I can get a better result using multiple pieces.

So, I cut and bent up some 18 ga, then added the dimples. The lower is one piece, the upper is actually two short pieces. Better use of material...

Lots of shaping left to go but you get the idea.


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