Taken from RPW

Now I know there have been about a million posts on intakes, and the MAS (mas air sensor for you noobs), and placement blah blah blah. However, I've never once heard that placing a "pod" filter, or cone filter as we call it here in the states, directly in front of the MAS will cause problems. If this is true, it would affect virtually every short ram intake. Does anyone else know anything about this, and/or have pics of the install mentioned about?

I also read on another thread that the length from the MAS to the TB (throttle body) must remain the same distance on an aftermarket intake, as it was stock. Is this true, and if so, how long would that be for the Lancer?

Thanks.

D

 

It is true. Just make the piping line up with the factory MAS location..... Measure the plastic piece if you are customing one......

https://www.evolutionm.net/forums/sh...hlight=aem+cai

 

I believe the distance from tb to mas is 8 inches.

 

Dunno about the first question, but the second question should be a relative nonfactor. Both the RRM and the RMR short rams use the stock piping that leads to the TB. Some of the eBay intakes provide another one, so that may be a concern in terms of keeping the same length.

There may be a slight difference in length, depending on individual installment of the RRM/RMR short rams, but I don't think it's anything to worry about.

Feel free to correct me, I'm not too sure on this one.

 

I don't believe the distance between the MAS and TB thing at all. AEM's seems longer than Injen's, Injen's seems shorter than stock, Cliff ran a DRI (Direct Ram Intake) which had virtually no distance between MAS and tb and had no problems that I'm aware of aside from his filter hitting the brake fluid resevoir.

 

Hmm. I have one yes for the distance, and a couple of maybe's. How about the swirling air thing? It seems kinda silly to me, and reminds me of that Tornado insert they sell on TV for way too much green. Not to mention the air gets bent and swirled in that crappy stock hose.

 

Airflow patterns definitely effect performance, but I can't say I know to what extent. Hence the popularity/use of velocity stacks.

 

i agree with hobie. distance from MAS to tb is not relevant. i own the aem cai and it is definitely a greater distance than stock.

i have actually known a couple of people who have the tornado. and all of them praise it. although performance gains aren't as great as advertised, most just like the better gas mileage.

 

TB->MAS distance is irrelevant due to the fact that it doesn't change the volume of air being counted by the MAS. If you look carefully at the MAS honeycomb, you'll see patches of dirty spots where just the smallest of particles are hitting it. Ideally, you'd have a velocity stack end right at that point to cram as much air into that hole as possible, that's why any filter with a venturi at top and bottom (like A'pexi's one) is ok in my book. Further down the road for me, I'm going to do the 6G72 MAS swap (no restrictor plate but I'll need an AFC and possibly injectors and a fuel pump...hm) to open up that entire side of the intake tract.

 

the way a MAF (mass air flow) sensor (term used by bosch) is that the honeycomb straightens the air. have you seen that brown peg inside the MAS (mass airflow sensor)? its sort of the shape of a triangle pointed towards the souce of incoming air. now as air passes around the brown peg, it swirls, creating a kind of vortex. if it passes the right side, it creates a counter clockwise vortex, and then vice versa. further in the sensor, there's like a sonic barrier. when the vortex passes this sonic barrier, the disruption is what the sensor reads, and thus tells the ECU how much air is entering the intake manifold. and for some reason, vortices aren't created from both sides of the peg at the same time so 2 vortices do not hit the barrier at the same time. only one vortex hits the barrier at a time.

now the swirling caused by a cone filter causes air to hit the honeycomb at an angle and also at way different velocities and masses throughout the surface of the honeycomb. for the sensor to work accurately, air has to come in quite straight and uniform accross the honeycomb. "i believe" this is why K&N recommends the oval filters for mitsus.

as for tb -> MAS length, it's recommended in theory because distance from MAS to intake valves has changed, and would be believed to be considered a variable in how the ecu calculates fuel management. further away, more air inbetween, and vice versa. may be negligent, but all in good measure.