Continuing on with the idea of finishing up important issues before going back on the build table for final suspension design, fabrication and placement, I wanted to decide on the scuttle and its supporting structure before taking the chassis off the rotisserie.
I may want to do my own scuttle in the future, so I'm not wanting to weld in anything permanently to fit just to the current glass fiber one. I decided to make some plates that bolt to the main chassis that can be used to build the scuttle structure, but have the scuttle structure be removable from them, and they in turn removable from the chassis. That way, my future options are unrestricted.
Here's what the plates look like. They are unfinished as yet, but you can get the idea. I wanted them to touch several members that triangulate just at the back end of the scuttle itself. They touch 4 RHS members.
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It was a little touch getting the 1/8" plate to lay flat on the 15° bend on the upper rail, but with a little back and forth, I got them looking pretty good.
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I have planned to triangulate the scuttle structure all along rather than make a simple hoop. To do so, I have 12 gauge plates that bolt onto the center of the tunnel structure. This portion of the tunnel is really well supported, and can carry a pretty high load.
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The combination of the side plates and tabs on the transmission tunnel are well placed in space to triangulate with. The photo below shows their arrangement in the car.
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Those finalized, I needed to re-examine my previous arrangement for the dashboard and scuttle structure. Here's the basics: scuttle, side plates and tunnel tabs.
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I added back the cardboard mock-up of my initial dash design. The brown card is the dash shape, and the black marker on it lays out my first imagined structure. The white piece is the donor ('94 Mustang) instrument panel. The yellow sheet with the black circle denotes the place where the T5 shifter emerges.
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The good news is that everything still looks plausible. However, I'm gaving a huge struggle deciding if I want to use the donor ECU, wiring harness and instrument panel shown here.
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Using it, and the donor wiring harness would save me money and time right now. However, I already have the parts to do a second, 4.3L version of the V6 engine. It's a 2000 multiport version of the 3.8L V6. I'm thinking going to a Megasquirt ECU and individual instruments now would be better in the long run. I have no idea right now if there is still expertise out there to do a suitable custom tune (stored program for Ford ECU) suitable for the 4.3L, while I know for sure there is for the Megasquirt ECU. I don't want to have to do the wiring harness and/or the dashboard twice.
I am perplexed and definitely looking for expert input on that issue.
Cheers,