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Old 12-26-2002, 11:40 PM   #1
92Laser1.8
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Post Custom Intake Measurements + Injen questions

Hey I was wondering if anyone had the measurements of the Injen intake pipe (including the bends needed). What would I need to make a custom intake, saving 200 + bucks (clamps, pipe?) Should I use Metal or PVC pipe? I have heard something about PVC pipe giving off deadly fumes when it gets hott... Once I do that I would like to cut the air can and attach a K&N air filter pointing towards the passenger fender (like on the Injen intake).

I also have another question for those with Injens...

Did you just throw away the air can or did they instruct you to cut it in the instructions ( I don't think they would do this but maybe).

I have seen a picture and it looks like the air can was thrown away and the filter is just held in by the 3 metal clips. Am I correct? Also did you have to lengthen the wire for the MAS with the Injen because of the new location of the filter setup?

How is the injen pipe held onto the air can lid? With collars?


The picture I have been using to gather questions and ultimately confuse myself...arrrgh
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Old 12-28-2002, 02:03 AM   #2
eclipse2nr91
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That's a lot to cover, but here goes...

I wouldn't bend it the same way the Injen is bent for the 2.0, first of all. More bends make more resistance, and the air has to travel further to get to the intake plenum. I'd either do a completely custom job (like a thread about some guy's custom one in this forum), or make one following the setup of stock. As long as you use piping (I'd definitely go metal, PVC has heating issues), it will get the air through easier, and will take in less heat. You can just throw out the air can, that's what I did, and the 3 clamps hold down on the filter itself just fine, without any gaps or anything. And no, the wires don't need to be altered at all with the Injen for the 4g63, as long as you face the MAS connector toward the battery/firewall, the wires will be fine.

Here's what you'll need to do this:
1. Some metal pipe, bent to fit of course
2. Rubber collars to connect the pipe to the TB and to the MAS (make sure you get the right diameter)
3. Clamps to keep collars connected to pipe
4. Breather filter for the engine (see where the vacuum line goes into the pipe, the little red tube coming out the side?) Since you won't have to put a "nipple" in the pipe, just get a breather filter for the engine...these are generally around 10 dollars where I've seen them.
5. Supports - supports are always good, unless you want your filter sitting down against stuff that can damage it. Just make something that can connect to a piece of frame or some other piece of solid metal under the hood (the Injen comes with 2 little brackets that go from the clamps on the filter collar to little metal supports that you just bolt on to a piece of metal, located somewhere in front of the battery)
6. Some patience, a little time, and a nice cold beer are always good with these things too

Eureka!! You've got yourself an intake! ...a big green intake with wings that's going to eat poor Gandolf!! Oh NOOOO!!!
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Old 12-28-2002, 11:16 PM   #3
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When I get around to making my custom intake using bent piping, I'm sure i'll make it with the extra bend in the pipe that puts the filter closer to the fenderwall like in the picture. The reason I want to do this is because of the hot air from the radiator fan when at idle. I think turbulent air is still better than extremely hot air from the radiator IMO.
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Old 01-04-2003, 12:16 AM   #4
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OK i installed my injen intake today. it was a breeze. i specifically ordered mine for the 1.8l. it came with 1 sleve for the throttle body, 1 to attache the intake pipe to the mas/filter 4 metal clamps, and a 8" vacum line. you totally ditch the aircan. heres pretty much how the installation goes in a short cut down version

take the entire stock intake pipe, box etc out. slip the smaller sleve over the throttle body, you hook the filter to the mas with the 3 clips from the airbox, and remove the bolt that is on the thermostat thingy. watch out cuz you might have some coolent leak out. but you install the pipe and make shure the bracket on the pipe lines up with the bolt for the thermostat, you connect the filter to the pipe with the other sleve and hook the mas back up. the wire is plenty long, it took me a long time cuz i couldnt find the right size sockets, i think you need like a 10mm 12mm and maybe a few others. if i had the right sizes right away it probly would have only took 10 or 20 mins. the car sounds much meaner but now my car keeps stalling. any help????
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Old 01-04-2003, 01:53 AM   #5
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It could be one of many problems...My guess would be that the ECU needs time to adjust to increased airflow, but I could be mistaken. Mine ran kinda crappy for a day or two after installation, then it ran fine. After that, the TB got all gummed up and was sticking, so I had to clean that out, and my car's been idling and running great ever since. Check to make sure the MAS is plugged in the whole way, and give it some time to see if it starts to idle properly.
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