Sure at stock boost levels im sure the stock restrictive air box is a wonderful thing. Once Modifications are performed to the hot side. free flowing exhaust..ect. A large diameter cold air intake will make more HP then any under hood plastic air box. once boost levels are elevated.

Ambient inlet temps will yield more Hp lower inlet temps after the intercooler. Less chance of preignition detonation and easier tuning.I wonder if the fastest stock turbo evo uses the factory intake and air box?

I will give you some of the theory on why this is the case. First off how hard the turbo has to work, IE speed and efficiency, is based partly on how dense the air is before it hits the turbo.

This is to say that if you double the density of the air at the turbo intake you will basically double the output pressure at the same speed (if you are running 30 psig at atmospheric intake pressure and you are somehow able to get 14 psig before the turbo you will get 60psig after it).

This of course doesn't take into account losses. This is why high pressure compressors are done in steps (shop air etc). Now that means the turbo doesn't have to work as hard so it has less mechanical loss and transfers less heat to the air when it compresses it.

On top of that any heat carried to the intake of the turbo will be there after the turbo. compressing the air adds a base ammount of heat using the equation

p1v1/t1=p2v2/t2

increasing temp one without changing the pressures or volumes of the equation will demand that you increase t2.

now that isn't exactly how it will work because you will have some changes in pressures and volumes but it shows that the temps are related.


Good luck.

 

I think HKS, thats what my brother bought.

 

I installed a Buschur intake after I installed the exaust. I noticed marked improvement in spool speed and power. I can't imagine that a smooth pipe would not flow better than the plastic snake that comes stock.

 

I got an HKS drop-in filter from autobacs usa in Stanton, CA for $40.00 and its better than a stock air filter

 

We've measured no significant intake restriction up to 360whp (on an AWD Dynojet) with the factory airbox. This was done by not only testing whp but also by logging manifold pressure/boost as well as vacuum in the intake pipe between the airbox and the turbo inlet. If boost remains unchanged and vacuum is essentially zero, then there is no flow advantage provided by any intake, open element or otherwise.

As for heat transfer, one could make an intake out of cast iron (which will get very hot sitting under the hood) and still suffer no charge temperature rise due to the fact that the incoming air has essentially no dwell time in the box. The same reason you can put your hand through a flame without feeling any heat if you do it fast enough.

And even if there was a inlet temp rise associated with an intake (as is the case with most aftermarket open element intake filters which over miserable cold air ducting), the intercooler will remove 85-90% of whatever temp rise it induces.

My 2c,
shiv

 

The intake temp has no effect on how cold the IC can cool the air (other than a higher intake temp will give the IC higher temp air). Yes it is very very important to pull the air from the coolest point possible. Not only will this give you less heat going into the turbo but the turbo will be working less adding less heat. In effect hot air is a double wammy, hotter (bad) and thinner (turbo works harder also bad).You have a great deal to learn about tuning my friend

Good Luck.

 

I have AEM its awesome

 

I suggest you understand my post before trying to insult me. You aren't bringing up any new points in your last post. But you did manage to skip over the other issues quite nicely

Regards,
shiv

 

Shiv and others. Air Assault is Just "Turbo Weapon" trying to stir up crap and get like-minded Evom members to go to his new Forum. Quit trolling for newbies to join your new empty forum.

 

Mark has made it clear that evolutionm.net is no longer a battleground for skirmishes between members. Members have a right to discuss topics that interest them unencumbered by off topic, antagonistic or insulting remarks. Such behavior will no longer choke the flow of ideas and discussion here. Any questions?

Speedlimit........

 

i will sell you my Typhoon intake. I lost power and think they suck. Along with idle issues, excessing timimg pull back, and on and on. You can also have that annoying PPPSSSSTTTTT everytime you shift to. Read my SIG. I got beat by a stock evo a while back. BONE STOCK!!!! Ime still pissed at all the money i spent to go slower............ (massive whining)

 

Good observation


There are no new points to make. A large diameter un-restrictive inlet pipe. That draws air from an ambient location will make more HP then any other intake. Stock or other wise.


Good Luck

 

i trust shiv more than anyother person in the world. well. kinda.

 

In summary, Turbo-Weapon has described the "ideal" intake (in terms of inlet temperature and pressure) and Shiv has responded that the stock intake has been found empirically to be "ideal enough" for the stock turbo (which does not induce any vacuum in the intake and so minimal benefit could be gained by any intake flow modification). As well, Shiv is saying that the stock intercooler/turbo combo has enough headroom that slight inlet temperature differences obtained with intake relocation are not going to bring enough benefit for the cost.

 

Look, to settle this argument.....

one guy, gave you all, the solution early on ....

The APS system is the BEST - and that's no **** !!!

it goes like this.

1. APS style design - in Gaurd The best hands down.
2. Factory air box, with a aftermarket filter element
3. all your other bull**** Pods that sit under the bonnet, like that bull**** review that these guys gave, "The AEM short Ram Intake"
what a piece of crap.

I had a APS on my WRX, and I didn't need a Dyno to tell me I had more power. Down in Oz, its the only aftermarket pod filter people consider, thought you Yanks would have had that one figured long ago.

I challange anyone, to put any filter they like up against, the APS style design.
but here's the catch, do it over different climate conditions, see who comes out on top ...... !!!

I'm just glad that APS make this filter for a EVO8, I was begining to think I had to design my own. all I could find on the Net were these, crap - AEM/INJEN/HKS/BLitz ..... underbonnet systems.

Dont get me wrong you still need to decide what Filter you want on the end of the APS style Cold air pipe, but that's an argument for another day.

Personaly - I went for the K&N.

PS: Once, you guys have discovered, that the APS style is the best, why dont you do another test with that pipe on your car, but interchangine the Filter on the End, see which is best .....