SMOD

I want to know this too. MPG is a big deciding factor for me. thanks

Jay351

Don't even bother dude.Those cheap filters will hurt your engine. Their lack of filtration FA outweighs their added flow (they have to sacrifice the filtration to get the flow numbers)

Buy a $10 oem paper filter. Its a good thing.

As for the Camery Vafm:

Plus - more room for intaking air = more power and throttle response
con - requires modification of your airbox and stock intake

there you go

Benny89

I did a cold air on mine, it was not K&N, it was spectre, and have the v6, i needed a few more parts than the 22-re. I used the brand called spectre, i got two small filters, for th valve covers, and one normal filter for the intake. overall its was about $125. it would be about $100 if you have a 4 cylnder cause you only have one valve cover. It adds a really mean growl type sound to the engine too. I noticed a decent upgrade power and about a 1-2mpg increase as well.

SMOD

Does the ISR decrease mpg?

mt_goat

Ace did an hour at the dyno last week with his 5VZ and found he actually got more HP with the stock airbox and intake. https://www.yotatech.com/51031296-post250.html

R Gale

Does anyone have an opinion of the Downey Air Cleaners?
(http://www.downeyoff-road.com/Engine...Cleaners.html#)

That and or Amsoil air filters?
(http://www.allfilters.net/)

SMOD

Wow, that is interesting.. Is that true most of the time?

mt_goat

Well when you think about it, it makes sense. Toyota does a lot of engineering and testing and those air intakes contain an air flow metering system that is very sensitive and fine tuned. I've heard that even very slight changes in intake tube diameter can throw off air flow measurement. Plus the stock intake is a "cold air" intake.

vj95

Doesn't the 3rd gen engine use a MAF? If so a MAF doesn't work the same way as the VAFM in a 2nd gen engine.

The way I understand it a MAF runs a hot wire through the flow of air. A larger diameter intake tube will slow down the velocity of air. So if it works the way I understand it you would actually get less fuel going to the engine for a given volume of air.

The VAFM works differently, the more the vane opens the more fuel you get. How much the vane opens is dependant on the needs of the engine at any point in time. As a result you should get a little better engine response.

Anyway, thats how I understand how these things work.

mt_goat

Yeah, different metering systems between the two. If you're saying the VAFM can't be thrown off by changing tubes I might be leery.

EDIT: Now that I think about it, it may be less likely though, I'll give you that.

vj95

I agree that the VAFM can be thrown off, but a person can compensate for that by turning that gear in the top of the VAFM counter clock wise to enrichen the the air/fuel mixture. Now, I'm not too sure what affect any change in velocity changes in the air delivery system would have (ie. increased volume but slower velocity).

SMOD

I have an idea what VAFM and MAF mean... but I'm not totally sure???

mt_goat

Volume air flow meter and mass air flow (sensor).

vj95

VAFM-Volume? Air Flow Meter
MAF-Mass Air Flow

Two different ways to accomplish the same thing. The way I understand it, the MAF has a heated wire passes through it. As air passes over the wire it is cooled off slightly. As a result the resistance changes, this signal is sent to the computer. The faster the air moves across the wire the more the change. Increase the RPM and the wire cools more. The computer then sends an appropriate amount of fuel to the engine.

The VAFM uses a potentiometer (a variable resistor) to modify the signal to the computer. The more the RPM the faster the air moves, the faster the incoming air the more the vane opens. The computer reads the amount of opening and then sends an appropriate amount of fuel to mix with the incoming air.

I may be wrong about this but its how I understand it works.

mt_goat

Yeah, volume or vane, the FSM calls it volume because it uses the volume of air to calculate the air flow. http://personal.utulsa.edu/~nathan-b...92volumeai.pdf

But it uses a vane in the process

SMOD

I think this thread has convinced me to keep my stock air intake on and just put a K&N air filter in the box. And maybe remove that plastic piece to reduce a little air restriction.

mt_goat

Good idea

Bad idea

mmcpeck

This is very confusing, all this time I have read that the ISR is a good idea, now it seems it may not be worth while.

Is there a MPG decrease and how much louder does it make the intake?

I am willing to do it if it's worth it, I don't care if I go from my crappy 15mpg to say 13 or 14, but I don't want to drop to 10.

Does the stock steup really silence the intake that much?

kinzer

i ordered a k&n filter system from napa at cost + 10% and payed bout 250... what i got was a plastic elbow that replaced the first rubber tube and plastic corner after the maf, an adapter plate, some mounting hardwear and the filter. it looks really good, cleared up alot of room under the right portion of the hood and added a nice deep growl when i get on the throttle.

however when i got it they gave me a dyno on a stock 3.0 4runner (even though i have a pickup) and it showed only 2.4 hp increase and didnt even have a torque measurement. over all i felt minor power increases and bout 2-3 mpg increase... i like that i got it, i just wish i didnt pay so much for it and the tube was bigger.

bigdaddy87547

I did a combination of the isr mod and deckplate. I used the plastic intake tubing from autozone (spectre). Drilled holes in the bottom of the stock housing. Makes a nice throaty sound. If you do this, access to dipsticks will be limited. on a 3vze of course.