Hello,
I was wondering about what people run for intakes and what seems to get the best results in terms of air flow. I have been told to go with an apexi intakes but im looking for more opinions. Also is a mass air necessary? or can it be deleted without harm to the engine? Sorry for the newb questions.

Bobby

 

I went straight from my stock set up to a K&N, removed emissions, and put in a new clutch all in one blow so I saw a lot of improvment.

 

Unless you're doing significant modifications to an n/a, or other noteworthy modifications to a turbo, it's really not productive to buy an intake. However, if you DO feel the need to do one, do what I did and buy a cone filter, cold air box, and vented headlight cover.

 

K&N drop in.

 

Drop a K&N in, along with some sort of snorkel or passage for cold air to enter the engine bay close to the intake. Don't do the vented headlight cover, those don't do **** I heard.

 

Just do a drop in if you really feel the need. I fabbed up a custom air box for a cone filter awhile back, and ended up just taking it all out. There's no power gain, and it created small hesitations at partial throttle. If you do go cone, you have to keep the AFM. The only way to get rid of it is with a standalone EMS.

 

Well I did the throttle body mod (removal of secondary throttle plates) to a spare throttle body and that would go in shortly after the intake if I did get one. Would the combination of both intake be noticable. I know the throttle body mod causes hesitation in low rpm but thats why you learn pedal control right?

 

People run all kinds of intakes. Most of them are no better than the stock intake, and some are actually worse.

A bell mouth inlet has the best subsonic airflow.

Apexi is good. I prefer K&N, as do most of the professional racers. The stock filter is fine too. Just stay away from the cheapie imitation performance filters because some of them tend to fall apart and get ingested into the engine.

The air flow meter (AFM) is necessary to tell the engine's computer how much fuel to inject. The engine will not work with the AFM removed unless you install a rather expensive and complex standalone engine management system or carburetor kit. I do not recommend getting rid of the AFM unless you are willing to spend a lot of time and money on your car.

 

The TB mod has no real power gain either. The only reason to get rid of the extra set of secondary plates is the clear up some of the clutter in the engine bay.

 

I love my apex-i intake. Itbolts on very very solid. One of these days I will get around to building a sheild/box for it to use the factory inlet over the rad shroud.

 

Yes I am aware its not of great power gain but I am not looking for that just better flow. That is why I was looking into intakes for better flow. I read somewhere that a stock rx7 air box was quite restrictive. Would the hisitation increase with both intake and throttle body?

 

The s4 box is supposed to be quite restrictive, so a cone would help with the airflow, S5 is a much better design so a cone wont effect the airflow as much on that.
Of course then you get the cone sucking in hot air is worse for the engine argument...................

 

i didn't know there was a difference between the s4 and s5 airboxes?

 

I just went with the HKS reloaded intake. Works very well. The foam material is much better.

 

Yes, the s4 has a square hole, the s5 has a nice round one.

If my camera batt was dead, as allways, i post a pic for you.