Ideas For Home-Made Intake?

[jordan101]

sorry guys i know it's not a corolla but it's still a toyota haha! the car is a 2.4 EFI corona, just wondering about idea's for custom home-made intakes some of you blokes have done or seen. Looking at building one my self as i find doing crafty stuff like that fun. i'm basically asking about what's been used, what size piping, how it was routed, gain or loss of power etc (yeah i know it's an intake and i won't gain 100 hp but it's just a little extra). if i go too big of an intake will i need to retune my motor to put more fuel in to cope with the extra air coming in? sorry about all the questions google just hates me!

 

i've included 2 photo's to show my current stock air intake, maybe that'll help answer my question. The first photo is of the standard intake, the second is of the little silver metal piece coming into the box (my finger pointing to it) can anybody tell me what it's for?

[snot35]

It looks like a flapper style air flow meter to me. You don't want to mess with that! I'd actually suggest looking around autospeed.com.au. They have some good articles on modifying standard intakes. They use a home made manometer to measure pressure drops and then modify the intake system to flow more freely. That would be a good place to start. You could potential put some sort of pod filter on the end of the AFM, but you have to consider you're also going to be sucking warm air in from the engine bay. How much were you thinking of fabricating?

[jordan101]

i'm currently in tafe doing plumbing so i work a lot with pipe work, i've had a look around i've found a route to take but it requires cutting into the radiator support panel so i've got to find out if that's safe. I may just just cut the hole in it and reinforce the cut with some sort of brace

[parrot]

I gather it is a good idea to put a bellmouth in the exit from the collection chamber to the plenum. I think also try to reduce turbulence with a longish intake from a cold air source.

[Des]

Mount a pod filter on the end of the AFM and seal the Pod from engine bay heated air. Use aluminum and a decent filter.

 

Flap AFM's are not as sensitive to turbulent air as opposed to hot wire and what ever the other are called.

Edited February 15, 2012 by Des

[jordan101]

so if were to make a pipe straight from the AFM to the front of the car (shielding it from any water and other contaminants ofcourse) i'd create turbulence in the intake? what if i were to go into the wheel well/tub instead?

 

i'm also trying to figure out if the general rule of thumb for intake pipe sizing is whether it's 'the bigger the better' or whether there's some type of mathematic stuff where i need to calculate the volume of air needed/too much air

Edited February 15, 2012 by philbey

[philbey]

the AFM itself will create turbulence. I wouldn't worry about that too much.

 

Yes there is a lot of science in inlet piping. Mathematic stuff as you call it. If you're only worrying about upstream of the AFM, then you need not get complicated.

 

A decent (expensive) pod filter will probably breathe better than your airbox. You want to be drawing in cold air, not hot air. Often people fit a pod then build a big box around it designed to draw cold air in.

[Hiro Protagonist]

What I installed (didn't make) in the Soarer on the weekend (MAP engine obviously, but the AFM could go pretty much anywhere along the pipe).

 

Stock

 

New

 

Sealed from engine bay, cops can't see pod either

 

Pod drawing air from under the front guard/bumper and behind the headlight (same place as stock, but in JZZ30s the airbox snorkel itself is the restriction, not where the air is drawn from)

[altezzaclub]

I went for ram air rather than just cold air, and the effect can be quite dramatic. An AFM is vital to see the mixture change, and I made a release valve to blow out the excess pressure.

 

http://www.rollaclub.com/board/topic/42407-the-girls-ke70/

[ke70dave]

you would hope that the EFI system could keep up with any changes caused by a ram effect though.

 

the easiest way to improve on your setup, would be to cut a dirty great big hole in the airbox, attach a large peice of flexible water pipe from bunnings to this, and run it to where it can grab cold air.

 

pod filters have the advantage of having a much larger surface area to suck in air, so that might be an option, but yeah have to do something simliar to what hiro has done.

 

Thats a pretty funky looking alloy pipe you got there hiro.

[Hiro Protagonist]

Thats a pretty funky looking alloy pipe you got there hiro.

 

 

Yeah I quite like it, was more positng up about the airbox though

[go baby go]

There is a little book called FOUR-STROKE PERFORMANCE TUNING by A. Graham Bell.There is an entire chapter devoted to the air inlet system which has helped me out numerous times.

 

This book has a lot of detail but written in such a way that even someone like me can read it. and yes I know a book is a little old school but old school is what its all about. :cool:

[jordan101]

@KE70dave: haha thats exactly what i was going to do, just couldn't decide on what diameter pipe to go for? 50mm, 65mm or 100... thought about just going with the 100mm pipe, cutting a hole on the bottom of the factory airbox, then cutting another hole into the metal into the wheel tub and routing it to the front of the car with some find mesh over the open (will keep the panel filter in the airbox tho - just get a 'high performance' one) does that sound good? would anybody know if 100mm is too big? and also if my efi will cope with the extra air?