What are some equations used to derrive the straight length of the manifold tubes based on the displacement of the engine/turbo size. I'd assume the bends develop their own characteristics per the design, but i'm looking to calculate the appropriate length piping for a variable setup. Thanks

 

Wtf is a variable setup? I like when people come up with questions like this, like they're going to figure out something the rest of us don't know, and then what, they're going to revolutionize the game? I don't even know how people figure this out mathematically anyway, there are so many variables, how do you account for and calculate enough of them simultaneously to make your result applicable to reality? For instance, everyone knows shorter runners are more suited to high rpm normally aspirated, but they will spool a turbo earlier and drop off more up top, supposedly. Explain that with math. Is there an ideal length and diameter for a certain setup for a certain goal, no doubt yes, but I doubt anyone on h-t knows how to Accurately calculate it, and even if they did, is that that going to make them win the race? I doubt it.
Don't take offense to any of this..lol.

 

The only way to accurately figure this out is to either specialize in or find someone who is a specialist in fluid dynamics. A mechanical engineer with a specialty in fluid dynamics would be able to tell you the best combination for your goals. The only problem is that every setup is going to differ. Changing the turbine, the cams, the displacement, the pipe diameter, the exhaust size, the boost ratio, rate of flow through the head, etc are all going to influence what works best on each individual setup. Since you're not attempting to make ground-breaking power, stick with something that works. I hate to be the nay-sayer, but there comes a point where innovation and practicality diverge. Building a "perfect" manifold is going to take a lot of R&D and testing. In short, is the cost of all the extra work and thought worth the gain? I doubt any potential customers will think so...

 

if people like trying to reinvent the wheel let them

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Schister66 &raquo;</TD></TR><TR><TD CLASS="quote">A mechanical engineer with a specialty in fluid dynamics </TD></TR></TABLE>
They're trained in "turbo system dynamics"..or "forced induction engine dynamics", for lack of a better expression..? I doubt it.
To the o.p., good luck. There was a thread similar to this in the fab section, I asked did you learn anything to the guy who said he read the book, didn't get a response. On the other hand, full race supposedly computer designed their intake manifold, and it supposedly outperforms everything else except maybe the AIR carbon fiber unit. So maybe you can properly design a turbo manifold the same way, who knows.