This looks like a very interesting option: http://www.aps-wrx.com/evo/evo8/hfa.htm

 

r there ANY intake system for the evo that was made WITH the AF problem in mind?

 

and how is a person to go about remapping - tricking the ECU?

 

kinda pointless to get a "cold" air intake when the air is going to pass through an extremely hot turbo. the difference between a cai and a regular intake is negable compared to the air temp after it has gone through the turbo

 

How about just an RMR or any cone filter intake replacement? Will that rob HP? What if you also have an MBC?

WRX STi

 

I just got back from RMR - we put in the intake suction pipe - it looks A LOT better than stock plus it relieves the low rpm loss some of you described. Because it's a straight shot to the turbo now, it really spools up quickly. It's a little bit louder on intake and blow-off, but not too much more.

Pretty sweet...

 

Sounds really great. Could you possibly post pic(s)
Thanks,
Bluesmaster

 

They have a pic of the pipe on their site, but I probably wont have pics of it installed until maybe tomorrow night. (That's if Ricardon brings his dig camera)

It is polished aluminum with silicone fittings. It fits pretty much like stock, but since it has less bends and is straighter, the BOV sits a little lower and one of the hoses is now shorter. I also have the RMR intercooler piping which integrates/matches the induction pipe very well. All in all, it's a really clean looking engine bay now.

 

Uhh. Sorry, you are wrong. Cold air does help. Use the search feature. This has already been covered in several heated discussions.

 

-- DavidV

 

The exhasut is what makes the turbo spool, how does the intake pipe make it spool faster.

 

Could it be because there is less resistance/restriction from when the air is being pulled through the bulky intake box?

On another note:

I have an MBC and I noticed that after the AEM cone filter install my boost went up around 3-4 psi!!! I already tried lowering the setting but it still spikes and goes to as high as 24 psi!!! For some reason, I had to turn the MBC knob the opposite way indicated on it before the intake install, but I tried decreasing it today and I think it it increased!!! I will run it hard again tomorrow to investigate. With the intake , the turbo spool and stock BOV sound really awesome.

WRX STi

 

I don't claim to be the engineer here - I just know that it sure pulls a lot more a lot sooner now.. Happy?

 

I did not see the discussions regarding this topic, but I have to agree 110% on this one. Intake air temps can and do have a significant impact on HP, even on a well intercooled turbo car. In some cases, perhaps even more so than on a NA car.
I have personally seen and done testing that shows this to be true.
When a turbo pulls in hotter (lower density) air, it has to work harder to produce the same boost/airflow to the engine. This is especially a problem when the turbo is already close to the limit of it's air flow efficiency (like in a modded EVO). With the turbo spinning faster, it's outlet temps can rise dramaticaly, even with a really good intercooler your engine intake temps are going to be higher than they would have been with cooler air going into the turbo.
Then you have to consider that when the turbo has to work harder (spin faster), this creates more back pressure on the exhaust. Both of these factors reduce airflow through the engine and cost HP.
A low restrictoin intake works well for the same reasons, the turbo doesn't have to work as hard, so the outlet temps will be lower, and then you have less exhaust back pressure.
If you can get the low restriction intake, and pull in cooler air, hell that's even better.
If this APS intake actually fits well, then it is far better than anything else I have seen so far. All of the vendors/tunners should be trying to duplicate it, (they probably already are).

I am just guessing here, but the longer intake tubing might also help to stablize the MAF sensor readings?

 

agree. especially if you are going for some engine management later on but cannot have frequent access to a dyno. Thus you will have to stick with the maps provided, like Vishnu, which delibrately states that you should use the stock airbox.

-Kenneth