A baffle necessary?
 

1) Would it cause alot of turbulence if I didn't use the baffle? My DP is just a single 2.5" tube, no divorcing.

I am going EWG so the flapper will be closed.

2) Any way to close the flapper w/ out welding it shut?

I fail at fluid dynamics, so I won't pretend to give an answer here. However,

Easy. Use a piece of threaded rod or similar, with a clevis-type end, with to draw the wastegate arm shut, just like the canister would in the normal configuration.

http://www.servocity.com/assets/imag...s_with_rod.jpg

um if you arent gonna just remove it then just unplug the boost source from the can and it should hold shut pretty damn well.

I would say use it. Cause the baffle is there to hold fluid in place for the suction/supply line to draw from. *Depending on how you drive, drift, drag and what not the fluid would be shifting all over the reservoir and if it sucked up some air that could be bad. Then you could run into fluid lock and all other kind of problems.

I could be mistaken but I think the OP is referring to the baffle in some downpipes that keeps the wastegate flow from disrupting the exhaust flow... no fluid involved.
I'd venture that if you have the internal WG permanently shut then the baffle isn't particularly needed.

The FM3 kit has a threaded boss (like a sensor bung) welded on the downpipe allowing you to run a bolt into the internal gate flapper. Pins it shut.

You could also weld the bitch.

FYI fluid can be any substance that deforms under stress. Any gas is a fluid, most liquids and some solids can also be characterized as fluids as well.

Sounds like you've already gone to an external wastegate...so why not reap the full benefits.

Fluid flow at the turbine exit is very important...there is a reason the Tial exhaust housing have the hyperbolic curve on them. Even if you keep the flapper shut you are still leaving an eddy chamber next to your turbine. For what it would take to fab a baffle and weld it to the downpipe flange I would think it would be worth it.

I realize this... however the person I was responding to was talking about the oil system which is filled with what most non-engineers would consider fluid and I didn't want to get into an overly long explanation about how gases act like fluids etc..

Agreed, but will the hour or so of fab and welding produce any dyno results?

Sorry.. inner ChemE can't shut the fuck up :D

Only one way to find out...empirical data. And we have a perfect test specimen.

Glass is a liquid. lol Sorry I didnt read his whole post, I just read the guy below his question. So I just answered the best I could.
I work with hydraulics so I just saw baffle and spouted out an answer. haha

I thought this myth was recently busted? And not by the show...

Glass is a crystalline solid structure.

A prof of mine said they found that cathedral glass is thicker at the bottom due to the setting process, and not due to fluid flow over long periods of time.

Found a link:

Is glass liquid or solid?