Hey guys, I havn't been on the forums for a few months, but here's my question:

What is everyone's personal experience and opinion of a cold air intake on a FC?

I did it because it seemed that the air flow around my engine bay for the intake was very insufficent. I decided to remove my windshield wiper fluid reservoir and cut a hole large enough to put the intake below in the line of direct air flow. Seems to work very well. I have my splash guards on so no worries of the passenger wheel kicking up dirt & water in it.

Anyone seen any negatives out of this though? Such as larger water intake on rainy days. Positive such as: Better throttle response. Anything really.

If you havn't done a CAI on your FC, please post your reason as to why you choose not to.

 

I love my CAI... i've driven in HEAVY rain and puddles and NEVER had a problem. Excelent mod!!

 

I love my STOCK cai. I challenge someone to take 2 stock bottoms, put them together so they can fit a K&N, (insert your own brand here), cone filter, and also replace the AFR, (VAF, Vane Air Flow) with a Mass Air Flow sensor (such as from Ford) and make it work with the stock ECU, (or more probably with a Megasquirt).
For those that do no know, the flapper door style AFM that the FC uses measures VOLUME of air flowing to the engine. If you drive up through the Rockies, you will still ingest the same VOLUME of air, and the ECU will see the same VOLUME of air. Where as with a MAF, Mass Air Flow sensor, you would get 2 completely different MASS readings.
At sea level you are ingesting alot more mass of OXYGEN than you would at 5000ft. above sea level.

 

i've got a custom CAI on mine as well, and i live on florida. i've driven through hurricanes and puddles without any problems.

 

I didn't want to put mine downward, so I cut the hole and routed some duct piping from the brake duct hole in the bumper up to the filter locations, and put a sheet aluminum shield around the cone filter (almost seals to the hood). Now I can access the filter from under the hood (as opposed to under the car), I don't worry about water, and I get an amazing response when the ambient air lowers temperature.

 

How do you hook up a MAF? What do these look like? Mine has the flapper kind.

 

Doesn't Ford mass air-flow sensors suck? My dad has had his at the shop like 4 times for it.

 

where abouts in s. fla?

 

954 area.. just south of you. (sorry.. off topic.)

 

Yes I'd like to know about this ford MAF too. If his statements are true about letting only the same amount of air in...then it'd be pointless to buy a cone filter, and build up a CAI if it's only gonne get the same amount of the same air as the stocker.

 

You need to learn a little more about the stock EFI system. Both flap (S4) and sliding-cone (S5) airflow meters have a built-in air temp sensor. The ECU combines the volume and temp readings to calculate a mass flow reading. The ECU also uses an atmospheric pressure sensor to compensate for changes in altitude.

 

So what exactly is correct then? Im really interested in knowing before I blow money. Thanks man.

 

The amount of oxygen is the same at sea level as it is at 50,000. The pressure changes.....

 

If that is true why the hell do hikers need oxygen when climbing VERY tall mountains?! I belive your wrong.

 

The amount of molecules of oxygen are the same in the air. If you are at sea level or 50,000 feet.

However, as you go up in altitude the pressure drops. And the molecules are spread further apart.

The reason hikers need O2 when they are up high is because there is a lower pressure. Not because there is less oxygen. The oxygen content never changed. Just the pressure.

James

 

Ok. So does anyone know if the guy is right about the RX-7 air volume not changing? Sorry for the off topicness but this is good info for people upgrading to CAI's.

 

Does it really matter unless you are at high altitude?

 

So basically what im getting at is this...using the stock AFM putting together an actual CAI, would it matter if I use the AFM versus the MAF?

 

Oxygen content for what? If youre talking about volume... the lower atmospheric pressure at high altitude does cause the molecules to spread apart, making the air less dense. Therefore, for a given volume, there are less oxygen molecules. Air density is not the same at different altitudes. What are you comparing oxygen content to, to say that there isnt any less at high altitude?

 

If you lower the intake temp, you'll make more power, period. All that talk about airflow meters was BS.

Lower pressure = lower density = less of everything, including oxygen. High school physics...

 

In response to your question about flapper style AFM (S4). You need an adapter that will bolt on to the AFM. The cone filter then fits over the adapter. I changed the orientation of the flapper such that it now hinges at the top, rather than at the side. Built a cold air box around the filter. Ambient temp is significantly lower than in the engine bay. Adapters usually come with the purchase of the cone filter, but you can also find them on EBAY for around $10.

 

I kinda copied this mod...........http://www.wcnet.org/~vbkrolak/vkfolder/vinspeed.htm works fine.

 

Thank you NZConvertible.

 

rotary dont like cold air...
https://www.rx7club.com/lounge-192/read-wut-guy-said-me-myspace-wut-idiot-475429/

 

That's a bad idea. The flap is now influenced by gravity. It's supposed to be kept as level as possible, just like stock.