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GT40 Tech - Exterior, Interior, AC, & Trim All that other stuff not in categories above.

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Old 8th November 2017, 09:38 AM   #1
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Why did I do this?

I recall seeing a bunch of pictures at different times of uses for the compartment immediately behind the driver in the "sponsom" (if the is the correct word). And some discussions on what was done with that space. I had made some notes, and found a cover and cut a hole and having some time before hockey the other night tapped 24 holes and installed the cover. (See pictures). Then the wife asked "what have you been working on?". Good thing I had some other progress to answer with, since if this had been the only thing, I think my reply might have been "I cut a hole and then took a slightly bigger piece of the same material and drilled and tapped 24 holes and patched the hole".

I don't yet have a particular plan. So what have you found most useful to utilize this space for and why?
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Old 8th November 2017, 09:40 AM   #2
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Re: Why did I do this?

Oh, one other addition to that. I got the cover from Mayhem MetalWorks. Cost was $50. I did have a little trouble sourcing it, as that size of cover seems to be hard to find, in particular in the blank. A few places on the web had it on their site, two of them I actually ordered it from (who both had the same part number on it), and they were both out of stock. Did find a couple of other places where the cover was $85 or more for just the blank. Was happy with what I found, so thought to mention where I found it.
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Old 8th November 2017, 09:49 AM   #3
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Re: Why did I do this?

I was going to put an MSD ignition system in there...
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Old 8th November 2017, 11:23 AM   #4
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Re: Why did I do this?

The empty sponson room is good storage for tools, flat tire kit or anything else. You can put the bottle for a fire system in there as well. If you use it for storage you may want to make some of the fasteners "dummys" so you don't need to remove 20 bolts to access the spot!

I would suggest an ignition module should go where there is some potential airflow for cooling. Especially with an MSD unit as the failure rate on those is rather high!
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Old 8th November 2017, 01:08 PM   #5
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Re: Why did I do this?

I used mine for the main Power Distribution point at the lower level, and tools/parts/compressor storage for the remaining 2/3 rds of volume space. BTW, the OEM Corvette compressor is integrated with a built-in Fix-A-Flat "Goop" container and selector switch. I believe Honda has them in some of their models, too. Good quality and compact.

If I was to do it again, I would have made mine into a surge tank, but the holes were already drilled by the previous owner.

The MSD box can be hidden and mounted upside down at the battery box cover. There's enough room between it and the battery and you can ventilate that area through the sponson with or without a small computer fan.
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Old 8th November 2017, 05:12 PM   #6
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Re: Why did I do this?

A Surge tank for what purpose?

The ignition box in the battery area is interesting. Not sure how much top clearance I have, but have a fiberglass battery cover that provides some additional room above a line that would be flat to the sponson. Gives an idea for sure.

That also brings up another question in my mind. I did get an Optima battery. Is the battery area normally vented somehow, or can it be closed off? How bad does the heat get in that area, would it be better to figure on something like a computer fan, or make a small vent out the side of the sponson (which would be behind the fiberglass skirt?
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Old 8th November 2017, 07:38 PM   #7
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Re: Why did I do this?

Mitch, if your car is EFI and will see track use or extended downhill drives your in-tank pumps will starve out based on fuel level, side accel and deceleration. Mine would starve at half tank and below on the track or prolonged descents in the mountains. One tank has the pickup at the rear, the other at mid tank. I also have the tanks stuffed with foam.

The solution is a surge/hopper tank and/or Holley Hydramat. If your car is just a Cars n Coffee car then don't worry about it...

MSD 6AL2 mounted upside down fits under the cover with plenty of room for it and the wires, and the Optima below. Trim the wires you don't need...

Wouldn't advise venting the fiberglass battery cover since it can easily ingest water from the topside which is why I have mine sealed with weatherstripping and secured with 4 Dzus fasteners. Vent at the inner sponson side (Less likely to see moisture), however, the main positive/negative wires pass thru, if made large enough, should be all the venting you need. The outer sponson and lower sill area can see moisture when driven in the rain so avoid drill holes there. I used the 1" plastic threaded conduit fittings to protect your wires from chafing at the pass thru. Rubber grommets will just dry out...
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Old 13th November 2017, 03:19 PM   #8
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Re: Why did I do this?

Tom,

Thank you, that is interesting. No mountains here, so I presume I won't be doing any prolonged descents that would cause fuel starvation. It is not EFI, so not sure if that totally eliminates my concern or not.

Not sure if I will have what you call "in-tank" pumps. I had seen an update where I think Holley 125's were used, gear rotor that can pull the fuel even when mounted above the tank with success. I think I am coming close to remembering that correctly. So my plan was to follow that, not sure if that fits the definition. I was imagining both pickups being in the rear, as the would fit under the clip. You mentioned a mid pickup, how did you do that? (is your passenger door welded shut because you do that track), or did you put the pickup in the cab?
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Old 13th November 2017, 05:27 PM   #9
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Re: Why did I do this?

Hi Mitch,
I use Bosch 044 EFI pumps so everything is inside the tank and accessible by a 4x6 inch oval cover plate. The positive wire for the pump, pressure and return AN hoses pass-thru, and the cover plate also serves as a mounting point for the capacitance fuel level sender. This is all mounted and accessible behind the B-pillar and near flush to the rear cockpit/firewall (engine side). It's all hidden by the "wings" that were offered (or requested?) on some kits by RCR Fran.

If you're going with a carb, then your pickups at the rear with no other sump solution, may work fine, unless the car will be seeing some track time...

Hope this helps....feel free to PM me with questions.
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