What's your personal experience with a CAI?
10-21-05, 01:04 AM
#1
Qwiksillva
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What's your personal experience with a CAI?
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.
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.
10-21-05, 01:39 AM
#3
'86 N/A Phone Dials
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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.
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.
10-21-05, 03:28 PM
#5
meh
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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.
10-21-05, 11:12 PM
#7
Originally Posted by Needa13b
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.
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.
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10-22-05, 12:17 AM
#8
very sleepy!!
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Originally Posted by 7th Heaven
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.
10-22-05, 10:44 AM
#10
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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.
10-22-05, 04:38 PM
#11
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Originally Posted by Needa13b
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.
At sea level you are ingesting alot more mass of OXYGEN than you would at 5000ft. above sea level.
10-22-05, 06:47 PM
#12
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Originally Posted by NZConvertible
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.
10-22-05, 07:09 PM
#13
Haven't we ALL heard this
Originally Posted by Needa13b
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.
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.
10-23-05, 12:13 AM
#15
Haven't we ALL heard this
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
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
10-23-05, 12:28 PM
#16
Tha ladies man
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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.
10-23-05, 03:11 PM
#19
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Originally Posted by Wankel7
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
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
10-23-05, 06:47 PM
#20
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Originally Posted by BuffDaddy915
So what exactly is correct then?
Originally Posted by Wankel7
The amount of oxygen is the same at sea level as it is at 50,000. The pressure changes.....
10-24-05, 08:06 AM
#21
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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.
10-24-05, 09:11 AM
#22
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I kinda copied this mod...........http://www.wcnet.org/~vbkrolak/vkfolder/vinspeed.htm works fine.
Last edited by jgrts20; 10-24-05 at 09:35 AM.
10-25-05, 12:18 AM
#25
I'm a boost creep...
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Originally Posted by Chuck
I changed the orientation of the flapper such that it now hinges at the top, rather than at the side.