Here is the science behind the velocity stack.

http://www.profblairandassociates.co...mouth_Sept.pdf

I was going to model my own custom stack based on this article. Still may, but I already had the 6” to 4” stack sitting in my MR2 so I used that one instead.

This issue I see with doing anything larger than about 3” is the rectangular section just doesn’t allow for a large round shape. At this point my 3D part through that section is right at the equivalent of a 3.9” dia pipe.

Here is a graph showing how small increases in pipe diameter have a large effect on square area. So every little bit helps. Also the model I created.

I like what you did and are doing. Please keep us posted. I did similar sims before but didn't take too much time to look at the underlying principle. What inspired me was the Vortech bellmouth, but just for fun frankly as I was already satisfied with the power I was having. Anyway, always glad to see more engineering inventions. Interesting. ^_^

I seem to be having fuel pressure issues. On a 10 psi run and taking video of fuel pressure gauge it didn’t rise more than 5 psi, if that. This is probably my duty cycle issue.

Here’s a 15.2 peak psi boost gauge photo.

What software are you using for 3D modeling?

Autodesk Fusion 360. It’s a pain in the butt!!


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Hey guys, maybe I am way outta line here! But, why the heck all of the effort to squeeze an intake through the radiator support?

The radiator support on our cars is just a plastic structure that has nearly zero value as a crash integrity structure, so why not just window the area that we need an intake tube to go through?

Please excuse me if I am asking a naive question. I am planning on getting the TG ACE kit, and all of this effort about a clean way to bring intake air into the SC has me researching a lot. I have looked at pictures of the 370Z and G37 front end and radiator supports and am just wondering why not hack it up? It's not going to rust away.....

Turtle and I both did plenty of hacking. Did you see where he went through 7 cutting wheels or something like that? So, we’re hacking, we’re just not removing all of it like one guy did. As for my approach, I didn’t want to be limited to a tube shape because as you can see, you can’t fit a large tube in there, and that greatly affects the surface area of the intake.

Maybe I'm naive. I haven't personally fully disassembled the front end on my Q60....yet. But, looking at the pics of the core support, it almost seems that you could section-out the core support, completely, and have enough room for a round tube intake. And the consequences would be nil, I guess??
Attachment 140017

I guess there are AC lines right there also?

And metal, and a headlight, more metal, bumper attachment point , a supercharger inlet that doesn’t line up with anything, etc.

Yeah, I got as close as I felt comfortable getting. I essentially did my best to round out that rectangle-ish hole there to fit a 3.5" silicone tube through. It has enough pliability to let me bend it to the Supercharger inlet. The problem being that with the pliability, comes collapse-ability... I haven't had the time I've wanted to work on a fix yet. My current setup collapses right around 10psi.

The reason that this is dangerous is because when the tube un-collapses, fuel may not be able to compensate fast enough to prevent the car from leaning out. Hence why I haven't taken it out for much datalogging lately.

Would you be interested in sharing your design file or at least an STL of the design? I have a spool of carbon fiber nylon that I would like to make the part with.

Hey man, you helped me out early on, so I can probably work with you on getting you something. I just don’t want to give away all the hard work to someone who might try to do something with it that I wouldn’t approve of. I’ve gotten mostly laughs and disbelief comments. Those comments got more likes than my posts of the design or data I posted. So I’m not really eager to share anything at this point. There a few guys who get it, and I’m fine helping them out and sharing things. I’ll email you!

Bens version 2. Just noticed this new video.

https://youtu.be/6YVHLzsSg4A

That looks really interesting. Made out of fiberglass definitely gives it more rigidity than silicone haha