Intake Question.... Which is better.

[Quint]

Decided that i might like to do something with my intake.

I've come up with the ideas (been sugested) that i should either make a cold air box, OR, extend the intake pipe about a foot with a 90 degree bend in it and either sit it just above my intercooler or drop it down (instead of accross) and sit it just infront of the front wheel (put protective covering on it to stop stone damage etc.)

Now i've got to decide which would be the better option?

Ideas anyone?

[Adamal]

I'd say go for a cold air box. Putting bends, especially 90 degree ones, in a system means that energy has to be used to make the air change direction.

Hey, I might be nitpicky, but every little bit counts!

Have a cold air box with some piping routing to it from the front of the car.

[Mr Revhead]

i wish the ppl who made the intake on my aw11 had followed that advice.

90 deg = NO!!

[Malcolm]

hmmm well on my gt4 I had my air filter in the front guard, in front of the front wheel. It obviously had a 90 degree bend, but had the decided advantage of sucking in very cold air, and had a very plentiful supply of air from and opening in the front bumper. Was good enough to make the car one of the fastest gt-fours in the world on stock computer, fuel system etc.
Having said that, on an NA there's a lot more to be gained from non restrictive intakes than from having slightly cooler air. IMO

[RomanV]

Yes, 90 degree bends are BAD. two 45 degree bends, or three 30 degree bends are considerably less restrictive, if possible.

[vvega]

you make the pipe to the filter straing
then you make a box for thr filter to go into
then you take some massivly oversize pipe and duct cold air into your new airbox
that way the bends dont matter

v

[Mr Revhead]

hehe yeah... on mine they got a piece of 4"pipe, cut it in half, cut the ends to 45deg and welded them together.....

[Malcolm]

hehe yeah... on mine they got a piece of 4"pipe, cut it in half, cut the ends to 45deg and welded them together.....

well...that's really quite a special way to do things...would've been better getting a Marley PVC pipe bend!

[Mr Revhead]

well theres a good chance thats what itll be replaced with as a tempory measure!!

[Quint]

Hey 'All_Fours'

your sig says you have a wrecked GA-70 with a man box, i'm interested in prehaps purchasing it off you if its what i'm looking for, drop us a PM or an email, or whatevers easiest.

[Argon]

IMO, bends in the air intake are not really the devil they are made out to be. Why are you really concerned by one bend, Have you counted the number between the turbo and the throttle body??

Pipe joints between rubber and metal or plastic pipes are worse as the surface irregularities create far more turbulence than a smooth radiused 90 degree bend. Corrugated plastic intake pipes are pretty bad for turbulence as well. Also the resonance of plastic pipes causes disruption to airflow through a pipe.

Cold air boxes are very bulky and can be difficult to construct to make them properly sealed from the engine bay. Remember, if you can get your little finger under the side of your "cold air box" hot air can get in and stuff up what you have spent a weekend trying to stop.

What I'm basically saying is that in most cases, some sort of air re-direction either before the filter or after is going to be necessary in the quest of lower inlet temps, so don't worry about what you can't avoid and instead minimalise all other possible design flaws.

Get rid of as much flimsy pipe as possible, use a pod filter with a built in heat sheild (such as a Simota WS007) and make it all water tight with the largest radius bends throughout the system as possible, positioning the filter in the engine bay and an intake pipe to the front bumper. This way it will minimise water and dirt from getting all over the filter. If you have a flap style air flow meter ( silvertop 20V) this will be the most restrictive part of the intake. don't piss around with 4 inch pipe leading up to it, its opening is only a maximum of 50x50mm square.

[matt dunn]

hehe yeah... on mine they got a piece of 4"pipe, cut it in half, cut the ends to 45deg and welded them together.....

well...that's really quite a special way to do things...would've been better getting a Marley PVC pipe bend!

Hey hey hey,

dont pic on the marley PVC pipe.

My car has 100mm marley tube from the air filter to the turbo. They have real nice clean reducers too.

Matt

[Malcolm]

I'm not picking on it I've used PVC pipe before too, cheap as chips, easy to put together, and reducers and adapters are very easy and cheap to get also I actually have a meter of 2.5" PVC pipe in my garage, which occassionally gets used on intakes etc