circuit.heart

What does the engine bay space look like further down from the top surface? I'm sure you have a good grasp of the geometry but I can't see how much room there is between the LS and the crash bar. If a notch in the crash bar is all it takes to get a healthy Y-pipe fitted, that'd be worth it.

allcool

Was thinking about this...

They do make a water repellent outerwears for jetski flame arrestors/marine applications. Iirr, you can get a sheet of it. Could secure it to the bottom of the deck lid opening, then secure another piece to the airbox/filter,,, that might be enough considering how much distance is between the filter and deck lid opening.

And if you could design in the deck lid a 'channel' like the convertible tops use with drains, on the bottom where the outerwears is secured to the lid opening, so water doesn't puddle on the outerwears screen that might help... Might need to use more of an angle to help gravity drain off the water into the channel...

cdk4219

Outerwears says they only hold water repellency for 6 to 12 months before they need to be replaced.

wdb

I think you really want to let the air into the airbox, give the water somewhere to fall, then pull the air through the filter. That's how factory units work.

gtxracer

Good questions. The engine bay is actually quite tight. I’ll double check, but I’d have to cut away part of the deck lid outer surface to get a Y tube in there. I could squish a tube or something for that space, but the LS3 throttle body actuator is still in the way a bit. If you want a real look, I’ll send you a 3D and you can poke around. FYI the crash bar (big aluminum brace that bolts in) was removed for this scan.

I like these ideas and would definitely incorporate drains and channels into the rest of the mounting features. I’m curious if the GT cars with similar intakes have problems with rain.

That makes sense. I was wondering if the material breaks down over time. Still, I think that’s a decent option and I’d just replace it every fall before the wet season starts.

Yeah I agree. Ideally this airbox would be deeper in the engine bay after a longer plenum to route the air and remove water via runoffs. I have a few ideas on how to catch the raindrops and channel them out the sides of the vented cover. I think this would work well for most of the rainfall and the cover on the filter itself would do the rest.

theprf

Does anyone make an aftermarket TB that isn't quite so gigantic?

gtxracer

I was looking into it a bit the other day, but it seems the actuator is mostly in line with the axis of the butterfly plate. I saw a couple that looked like the actuator was behind the axis a bit, but nothing promising.

This was the closest I found, at ~$750ish but totally bling.
https://dedicatedmotorsports.com/products/nick-williams-103mm-dbw-billett-throttle-body.html
https://briantooleyracing.com/nick-williams-103mm-ls-dbw-throttle-body-sd103ls.html

gtxracer

Actually.... @theprf I think you're onto something. A quick comparison between the two throttle bodies looks like, if I spend some $$$ on the bling TB above, I'd have room for a Y splitter. I wanted to avoid a Y splitter, but I think it would work well enough.

zbomb

Does this count ?

gtxracer

@zbomb would LOVE to have ITBs...but doubt they'd fit and they I'd have to route air to them. I have a e92 M3 with the S65 4.0L V8 that has them though

2mAn

I have a y-pipe from a 997 turbo that I will donate if needed....


Not sure if its too big or too small. I can measure the TB side if you'd like

cdk4219

The v8 TB unfortunately sits much closer to the deck lid than the mezger one. It’s a challenge to get an inlet tube on there. I don’t think the TT one will work.

gtxracer

thank you! I think it would be tough to fit that in there, but if it would, I'd gladly take it. Always fun to repurpose parts and an OEM Y splitter would be great, especially a P car part.

Yeah...it's quite close with a 4" tight radius silicone elbow. I think that's all that would fit.

2mAn

Let me know if you want me to take measurements

circuit.heart

That's totally worth it if it solves your other packaging problems. Opening up a second stock-sized hole in the right side of the decklid is easy and will give you enough air to feed the LS. The inlet Y won't be too bad of a choke point considering the size of the piping vs the power you're expecting to make.