DIY Turbo Discussion greddy on a 1.8? homebrew kit?
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A baffle necessary?

 
Old 10-02-2009, 10:10 PM
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Default 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?
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Old 10-02-2009, 10:19 PM
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Originally Posted by kenzo42 View Post
1) Would it cause alot of turbulence if I didn't use the baffle?
I fail at fluid dynamics, so I won't pretend to give an answer here. However,

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

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Old 10-03-2009, 12:18 AM
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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.
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Old 10-03-2009, 11:15 AM
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Originally Posted by kenzo42 View Post
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 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.
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Old 10-03-2009, 11:31 AM
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Originally Posted by WESamiss View Post
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.
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Old 10-03-2009, 11:47 AM
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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.
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Old 10-03-2009, 12:56 PM
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Originally Posted by Rennkafer View Post
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.
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.
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Old 10-03-2009, 01:02 PM
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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.
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Old 10-03-2009, 01:29 PM
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Originally Posted by albumleaf View Post
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.
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..
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Old 10-03-2009, 01:32 PM
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Originally Posted by gospeed81 View Post
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.
Agreed, but will the hour or so of fab and welding produce any dyno results?
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Old 10-03-2009, 02:23 PM
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Originally Posted by Rennkafer View Post
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..
Sorry.. inner ChemE can't shut the **** up
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Old 10-03-2009, 02:35 PM
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Originally Posted by Rennkafer View Post
Agreed, but will the hour or so of fab and welding produce any dyno results?
Only one way to find out...empirical data. And we have a perfect test specimen.
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Old 10-03-2009, 02:43 PM
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Originally Posted by Rennkafer View Post
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.
Originally Posted by albumleaf View Post
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.

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
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Old 10-03-2009, 02:55 PM
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Originally Posted by WESamiss View Post
Glass is a liquid.
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?
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