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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCold Air Intake???
Reported or suspected cause
maf calibration is thrown off
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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Reported cause
The biggest problem is the MAF calibration is thrown off.
Leading evidence: 'maf calibration is thrown off' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'maf calibration is thrown off' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Install k&n cai' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed
I installed the K&N CAI on my Jeep Cherokee Overland.
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Performed · outcome unconfirmed
Have had it for one year, just installed the x-crossover cats from Fabspeed and sound like a cup car seriously awesome sound paired with the PSE system.
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Performed · outcome unconfirmed
I run my air intake past my AC evaporator, I like to cool the air charge by at least 10 F.
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Performed · outcome unconfirmed
Added a Flowmaster when the wife ran over a mattress on I95 that minutes later had melded itself to the OEM muffler like a tuna melt.
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Performed · outcome unconfirmed
Have had it for one year, just installed the x-crossover cats from Fabspeed and sound like a cup car seriously awesome sound paired with the PSE system.
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Suggestion
Just for grins, I think I'm going to try insulating the factory airbox and ducting and see how the IAT reading compares between that and the K&N I'm currently running...but only if Cuda is willing to send me back my factory airbox.
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36 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Outcome without a verified action link
I do feel additional power after the cat install - air intake system alone absolutely No difference.
Not sure if this has been discussed in the past, but I have a K&N CAI on my 2000 C4. It seems to me that there is no cold air going into the intake, why don't they call it Hot Air Intake? Is there a "REAL" Cold Air Intake System available to us
Just curious
Yes it has however I find these days, anything that attempts to shield the filter from the rest of the hot engine bay is called a "cold" air intake system.
If you're not sure whether yours really works as a "cold" system, take a temperature probe and place it next to the filter and then again in the engine bay and compare to outside ambient temps.
For the K&N setup, you could always cut the bottom of your decklid lining as well.
I guess a "true" cold air setup will be sucking in as close to the ambient air temp outside the engine bay if you want to split hairs.
Also, you might want to read up on independent dyno test articles between cold/hot setups. You'll find that it is more than just the temp of air that determines gains/losses.
Yeah, real cold air intake equals OE air filter box with the OE horn that fits under the spoiler. Just saying...maybe Porsche already thought of that???
Just thinking out loud...
I wonder what would be more "cold air" with the stock setup? Even the aftermarket ones that don't have as full of a box would still be getting - at speed - it seems - a lot of the air from the vents above. I would venture to guess someone would need to make some kind of a scoop to really get a better airbox, and at that point why not buy a model that has them?
IMO
especially on a hot day with the engine up to temp from a standing start etc I can feel my car feels a bit down on power but mid to high revs it feels to be a bit more urgent
although I went for my induction kit more for the noise than the power gains
and I know you don't go popping the lid for every tom dick and harry but imo looks very sexy under there too
20141116_151301_zps4g4pd29a.jpg
and a little vid for anyone interested
Porsche 911 996 with fabspeed twin air intake - YouTube
oh and I am planning on opening up the right hand side too so has a better feed as per the left side oe feed
Fabspeed has a nice cold air intake, but I don't think it will work on a 2000. At least it did not on mine, kept throwing a CEL. Fabspeed said they could fix it but would need the car. Other years, they could send a chip. It sounded GLORIOUS while I had it.
Those are hot air intakes, unless the deck lid is greatly modified, and the air box insanely insulated.
I have seen IAT increase 32 degrees when adding a CAI in the past. That was a back to back test, the same day, ambient temp only varied 3 degrees, engine bay temp only varied 5 degrees.
Jake, that is too bad you feel that way, because you're one of the few persons that I appreciate and whose expertise I value. This question came up because I was talking with a friend and we began to talk about CAIs (
which were better
). I've had the Evoms and now I have the K&N. The phrase "Cold Air Intake" was the opposite of what is actually happening under the deck lid. It appears to me that all that is going on is Hot air intake
. Very confusing for a novice wrench like me
True cold air systems = OEM Airbox. If you want additional sound and a slight bit power, get drop in panel replacement and ditch the intake resonator along with getting a silicone intake hose. This combo has been dyno'd to give just as much power if not more than a lot of the aftermarket systems.
As in traditional RL fashion, we can all over analyze this and continue splitting hairs and making more effort out of nothing that would be negligible at best in the real world.
I installed the K&N CAI on my Jeep Cherokee Overland. I love the sound. Added a Flowmaster when the wife ran over a mattress on I95 that minutes later had melded itself to the OEM muffler like a tuna melt. Now it has great noise from both ends.
I like the look of the Fabspeed dual CAI setup. Based on my satisfaction with the Jeep install, I planned on the K&N CAI for the 996, actually making the step of purchasing the kit. But I balked at the thought of drilling any holes, even small ones, holes in my beloved P-Car. I saw the need for holes when I was reading the directions prior to the install. The Jeep was a simple "slap it on" affair - no drills, no violence, no anguish.
I have the Fabspeed completion cold (seriously question that) air intake and couldn't be happier. Have had it for one year, just installed the x-crossover cats from Fabspeed and sound like a cup car seriously awesome sound paired with the PSE system. Sounds great, looks great. I do feel additional power after the cat install - air intake system alone absolutely No difference.
There are many problems with aftermarket 996 kits. I have dyno tested many of them.
The biggest problem is the MAF calibration is thrown off. This throws off your air/fuel ratio and can cause pre-mature catalytic converter failure. Not to mention poor fuel mileage. K&N's was one of the worst I saw. A/F was 12.9:1 stock on this particular car, and went down to 11.7:1 with the only change being K&N's intake kit. No software change.
The best cold air kit would be something like FS's that uses the stock airbox but gets rid of the noise-reducing resonator inside the airbox. This opens up the plenum volume as well as creates a more stable airflow path into the throttle body. Then, cover up the bottom and back (engine) sides of the airbox with some kind of heat reflective tape/foil. I wouldn't even change out the paper filter.
Remember, the X51 kit uses the same airbox as the stock C2. Hell, the 996 GT3 used the same airbox. The airbox is not the biggest restriction.
I agree totally... The K&N situated the MAF in a horrible location and effects idle quality a good bit on some cars.
Those are the things that people at those types of companies don't consider... Because they don't build engines.
Just for grins, I think I'm going to try insulating the factory airbox and ducting and see how the IAT reading compares between that and the K&N I'm currently running...but only if Cuda is willing to send me back my factory airbox.
OBDII provides intake air temp data continuously. Running my wifi reader, my app on my iphone gives real time IAT.
I think this data tool can easily tell you whether your CAI is actually making a difference.
It's hard to believe that anyone really thinks that removing the stock box and ducting and replacing it with a cone filter right in the middle of the engine bay actually cools the air charge - but I have underestimated stupidity in the past.
Most CAIs should be relabeled as ASIs - awesome-sounding intake - since this would be more accurate and would eliminate the need to doctor up dyno graphs.
Isn't there a setup that mostly uses the stock airbox? I'd think that one would be mostly OK?
But yeah, not only is it in the engine bay, but you have all the exhaust in there (unwrapped) as well. Did get a kick out of the one intake that's right by the mufflers.
I think if you block off all the small drain holes at the bottom of the stock air box, the intake air will be fully through the snorkel so it should be much cooler. Don't drive your car in the rain though
Check your air filter and you will see trace of dust in the area corresponding to those drain holes. That means significant hot air gets sucked in from there, right above the catalytic converters.
If it really mattered that much just take the air filter off and run a screen. Cheaper, at least in the short term.
Actually, anyone ever put one of these on a dyno with the filter off?
There are some great YouTube videos debunking the claimed benefits of most CAI set-ups. I'll see if I can locate a link later on but one includes multiple dyno runs to show how a variety of installations still result in no real noticeable gains. I've got an EvoMS box on my car that basically looks like this...
I don't know whether it does anything but it sounds great. I like the idea of renaming them as Schnell suggested! lol
-Eric
