yeh I just did it for kicks but it really WAS a big difference in suction. If someone wants to do a scientific test with dyno's and such great but that's as much trouble as I'll be willing to go through. hehe

 

A dyno wouldn't be a "good" test. Too many variables. The best test would be to measure pressure drop across the entire filter at sufficient flow to make 310 hp. I bet it's less than an inch of water. Your air filter - even a K&N - will drop more than that.

 

To those who did take it off, did it get louder?

If the resonator is preventing this from being noticed I would like to disconnect it somehow and check the sound with and without charcoal filtration(really only good for drinking water and fish tanks anyhow). Right now my car is extremly quite.

With intakes that i have installed, the car got alot louder. There are plenty of dynos that show gain with cai, even though they are not true cai.
cai plus throttle body bypass even better.


The car will run rough with a new change in airflow, until map sensor responds and adjusts for this wonderful change.

 

Toyotas showed big gains from intakes? Really? That's not my experience. Ever. Hondas do for sure, but not every car has a screwed up intake from the factory, and either Toyota gets it more right, or the biggest problems with their intakes isn't in the tubing before the throttlebody.

Also, no Toyota uses MAP. Not one in the more than 20 years I've owned and tuned on them.

 

I have friends who do CNC'd LSX heads (GM) but they have a flow bench. How many cfm should I have them flow test at?( the filter)

 

200 CFM should be plenty. That's what the engine theoretically flows at 7000 rpm with 100 percent VE. I know it's got to be less than that, so 200 CFM should be just fine.

If you can get them to do a couple of quick tests, it would be ideal to remove the OEM airbox so the filter can be tested as configured. Just hook up the airbox outlet to the intake tube connection. Test with and without the air filter too...

I'd do it, but I haven't had access to a flow bench since '93.

 

(Quote) "After putting all back together didn't notice much if any power increase but didn't expect any either. Maybe a little bit better throttle response but that could just be my imagination. I'm sure there's a power gain but maybe like 1/4hp if that much".

If there is no performance benifits, why would anyone do this? You will have to change the filter sooner by doing this.

 

My 2004 4 Runner has this charcoal filter or had i should say. I took it out a long time ago, now im not going to say it made a huge difference but i could tell a difference in throttle response. I havent done it to the Lexus yet but then again i want to sell it.

 

OMG this thread is out of control. The video was funny. The problem with the video is after placing the filter over the suction hose, and placing the paper in front of it, their is a distance between the paper and the hose. This space is made from the material of the filter and makes room for the suction to come from different areas. If you really want a test the suction or restriction of air flow, make a filter that fits the hose and have the same size opening as with or without the filter. Maybe you can rig the OEM air box and do the test.

 

Im leaving mine in!

 

FWIW, I removed my carbon filter when I installed my HKS drop-in, Joez pipe, and shaved the resonator on the cold air snorkel. I have no idea if it would make a measureable difference, but I knew it had to go. Honestly, it seems like a silly thing anyway. Like any other filter media, charcoal needs to be replinished regularly. I doubt the charcoal media in that filter has any effectiveness after a few thousand miles.

 

^ not only that but after a while any dirt that passes through an old primary filter might start collecting on the 2ndary charcoal filter as well except you can't change this one out like you can the main filter.

 

Maybe its just me but even if it did for some reason give you a 1 hp increase, do you really want to "SILICONE" something back into your 35k+ Lexus?? I dont know about you but i really dont want to have to silicone ANYTHING in my lexus...

 

^ you can pull the filter right back off after the smog test if it's been siliconed on. Silicon glue is just a rubbery kind of adhesive that pulls off clean.

 

Ya but the point is, do you really want to remove something that breaks once removed and the only way to put it back on is with silicone? Personally if its not meant to be removed than it should be left on but that justs my opinion...