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Old 02-04-2001, 02:22 PM   #1
tonytiger
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Join Date: Jan 2001
Location: Helsinki, Finland
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1993 Legacy 1.8
White

Question Making cold air intake for legacy, some help needed

I have my -93 legacy 1.8 with the original silencer. I decided to make my own intake. So, aluminium looks great, but I'm thinking to be satisfied with a plastic one. Is plastic ok for the material? Secondly I've seen pictures of intakes like Larry's and they have few bends in the pipe (also the original in my car has bends). Is those bends necessity or should as straight as possible be the best shape? If bends are there for some cause, what would be good angles for those bends? And what about the inside diameter of the pipe? I'm planning to use as big diametered pipe as my car is capaple (meaning the pipe connections are possible bottlenecks since the subaru's air filter box will remain unthouched). Is bigger always better? May have forgotten something...

Thanks in advance...

[This message has been edited by tonytiger (edited February 05, 2001).]
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Old 02-04-2001, 02:33 PM   #2
tonytiger
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Jep, forgot the one thing. Should the ECU be rebootted and can it be done by taking the minus power cable off the battery for an hour?
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Old 02-05-2001, 11:31 AM   #3
Julian
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MY00 RS
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The bends in the Ganz Flow and the like route the intake pipe to a hole in the Impreza fender. Depending on the design of your Legacy engine compartment and intake, you may need one or multiple bends.

I used mandrel U-bend exhaust pipe for my DIY intake. You can get this stuff from Jegs or Summit. Biggest radius bends as possible for best flow.

Julian
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Old 02-05-2001, 11:49 AM   #4
tonytiger
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So there is no other reason for the bends than the fitting in the engine bay(?) Ok, thank you Julian. Had some pretty rough ride today and the air intake pipe didin't warm much, so i'm thinking plastic should be good enough for the material. I'm also thinking to make a intake to the front of the car. Meaning the air pushing to the pipe when driving. The more speed the harder it pushes the air to my motor. What do you think about that? I'll also buy an jr air filter, which is washable.
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Old 02-05-2001, 01:12 PM   #5
tonytiger
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I don't bother myself about the ram air then. Well I have everything I asked about the pipe. Thanks again Julian. Now I only need to find some material...
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Old 02-06-2001, 12:52 AM   #6
Julian
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The "Ram Air" effect doesn't really work that easily. That's the basic idea, but it has to be a straight shot to the intake TB, and you have to be at speeds high enough to generate the necessary pressure wave. On cars with the system (300+HP Camaros and Firebirds), they get 5+ HP out of the system, but only at 100+ mph.

However, ducting cold air to your intake would be a good thing because cold air is denser than warm air and can be combined with more fuel for more power. So, you can use your original idea, but for cold air instead of ram air.

Julian
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