darthqwo Posted February 26, 2020 Share Posted February 26, 2020 (edited) Pardon me for sounding like an idiot, but i have never seen things like e. They look like turboes, but it would make no sense to be mounted right up front. I would guess they are air ducts, so somebody please write it down below what that is. They are not fourth gen and neither subarus, but the second one is a second gen impreza. omg thanks. Edited February 26, 2020 by darthqwo \footnote{There are four links, one on each letter.} Link to comment Share on other sites More sharing options...
Chocoholic005 Posted February 26, 2020 Share Posted February 26, 2020 Those are velocity stacks for the turbos directly behind them. They are essentially fancy intake scoops. Link to comment Share on other sites More sharing options...
awfulwaffle Posted February 26, 2020 Share Posted February 26, 2020 https://en.wikipedia.org/wiki/Bell_mouth Use them in test cells all the time. Meant to deliver consistent, minimally distorted airflow to the compressor face as efficiently as possible. Link to comment Share on other sites More sharing options...
darthqwo Posted February 26, 2020 Author Share Posted February 26, 2020 (edited) omg thanks omg thanks i want to put one in the passenger fog light and then route silicone tubing up to the airbox but wonder if that would defeat the purpose of efficiency do i have it wrong, or does the compressor face need air separately from the air inlet on turbo Edited February 26, 2020 by darthqwo Link to comment Share on other sites More sharing options...
awfulwaffle Posted February 26, 2020 Share Posted February 26, 2020 I think it's purely cosmetic on any factory-type Subaru setup. All the bends between the bellmouth and the turbo (not to mention the airbox itself) would introduce plenty of distortion to the charge flow, defeating the purpose. They're meant to work when they're close coupled to the inlet (directly attached to the throttle body or turbo, in this case) Link to comment Share on other sites More sharing options...
darthqwo Posted February 26, 2020 Author Share Posted February 26, 2020 but outside test cells there would need to be an air filter and nonetheless a maf between the belmouth and turbo? Link to comment Share on other sites More sharing options...
Notorious Posted February 26, 2020 Share Posted February 26, 2020 No purpose of routing that through the fog light. Good luck filtering out debris and water. Most people remove the headlight housing completely and replace it with this kind of setup. Link to comment Share on other sites More sharing options...
awfulwaffle Posted February 26, 2020 Share Posted February 26, 2020 (edited) Not always. Outside test cells I've run in have been set up such that the entire ingestion zone in front of the bellmouth is clear - care is taken to make sure there's no debris that could be sucked in. In the cases where some filter is installed, it's typically a pretty coarse wire screen, which is uniform across the intake to minimize distortion.  Airflow measurements are sometimes taken upstream of the bellmouth, but in those cases the probe is small enough not to meaningfully disturb the flow. Otherwise, in something like an automotive turbo, you'd probably be better off measuring flow on the discharge of the compressor instead.  ...either way, I think there's a world of difference between a controlled test cell environment and running a bunch of piping from a bellmouth to the turbo sitting way back in the engine bay. It'll be all the sharp bends in the tubing and all the internal features in the airbox etc that defeat the purpose.  My .02 Edited February 26, 2020 by awfulwaffle Link to comment Share on other sites More sharing options...
Infosecdad Posted February 26, 2020 Share Posted February 26, 2020 The other thing to factor in is that they probably aren't working for longevity. Replacement engines and turbos are likely a regular thing for them. If I remember correctly, a speed density tune doesn't need a MAF and would likely be used in these scenarios. Link to comment Share on other sites More sharing options...
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