[andyc]

Hi I was wondering whether is there a cold air intake kit in development for the 335i coupe?

[HyperM3]

Yes, but by true definition its not a "CAI" but an open element intake.

[wj4]

I've never seen a real cold air intake for any turbo'd car, the ones that have the air filter behind the bumper. All the ones I've seen are short ram.

[HyperM3]

Originally Posted by wj4

I've never seen a real cold air intake for any turbo'd car, the ones that have the air filter behind the bumper. All the ones I've seen are short ram.

See, a lot of people think that its ok because the air is going through the intercooler anyway. Therefore, the hot engine air isnt "techincally" going into the engine. However, I still think theres no way you can cool it down that much especially as the engine gets even hotter. Until then, Im happy with the stock intake and an aftermarket panel filter.

Most turbo cars have found the aftermarket CAI intakes to actually lose HP. Sure you can get a really cool looking carbonio intake for $400 to show off when you open your hood. But when its closed, nobody sees it and you feel the drop in power.(Im referring to the A4's that a lot of us owned previously)

[andyc]

so which company is developing the intake for the 335?

[HyperM3]

Originally Posted by andyc

so which company is developing the intake for the 335?

http://www.e90post.com/forums/showthread.php?t=71138

[elucas730]

Originally Posted by HyperM3

Most turbo cars have found the aftermarket CAI intakes to actually lose HP. Sure you can get a really cool looking carbonio intake for $400 to show off when you open your hood. But when its closed, nobody sees it and you feel the drop in power.(Im referring to the A4's that a lot of us owned previously)

It's also the case with WRXs. The stock airbox on the WRX is good up to something like 400whp. After that you made need something that breaths a little bit better. I wouldn't be surprised if that's the case with the 335.

[droptop335]

Originally Posted by HyperM3

Most turbo cars have found the aftermarket CAI intakes to actually lose HP.

Why would that be? Assuming all else being equal (same flow volume, same restrictions, etc), wouldn't cooler air from outside the engine compartment result in a cooler charge, and hence the potential for more power?

[BoostedBMW]

Originally Posted by andyc

so which company is developing the intake for the 335?

GruppeM also has an intake available for the 335, but the price is ridiculous at $1800. A sponsor on here is making a replica of it, you can check it out here...

http://www.e90post.com/forums/showth...replica+intake

[Radioactive Man]

Originally Posted by droptop335

Why would that be? Assuming all else being equal (same flow volume, same restrictions, etc), wouldn't cooler air from outside the engine compartment result in a cooler charge, and hence the potential for more power?

He's right, CAI's on FI cars typically have no benefits. I'm assuming the beenfit of the cooler air is negated when the air is compressed since this causes a temperature rise.

[omg516]

Not only is the cooler air negated, the extended piping worsens the effect.

[droptop335]

Originally Posted by Radioactive Man

He's right, CAI's on FI cars typically have no benefits. I'm assuming the beenfit of the cooler air is negated when the air is compressed since this causes a temperature rise.

OK, I'm not saying you're wrong, but I just want to understand. A turbo will compress the air and heat it as it does so. I understand that it always increases the temp by a specific amount...say for example 20 degress. If the incoming air on a stock intake is 80 degrees, then the charge air would be 100 coming out of the turbo. But on a CAI-equipped car, if the intake air is at 60 degrees, them wouldn't the charge air only be 80 coming out of the turbo? Wouldn't that increase power (denser charge)?

What else would negate that power increase? How does extended piping have a negative effect if the flow volume/rate stays the same or better than the stock intake?

[HyperM3]

Originally Posted by droptop335

But on a CAI-equipped car, if the intake air is at 60 degrees, them wouldn't the charge air only be 80 coming out of the turbo? Wouldn't that increase power (denser charge)?

Again, as long as it really is a Cold Air Intake, meaning its nowhere near the engine. The fact is, most cone filter intakes arent true cold air and therefore rest somewhere in the engine bay. This pretty much defeats the purpose and where the stock intake, while a bit more restrictive, retains less heat through its routing process. Also, look at the materials used on the stock airbox and piping. Most aftermarket intakes use aluminum piping. Aluminum gets hotter and retains more heat than plastic.

Theres a lot of things I believe engineers put into their cars to restrict for EPA and other regulations, but Im pretty sure they designed this airbox as complete as they could. Compared to e36 and e46 designs, there are no extraneous baffles or tunnels to minimize sound or hp.

[elucas730]

Originally Posted by droptop335

OK, I'm not saying you're wrong, but I just want to understand. A turbo will compress the air and heat it as it does so. I understand that it always increases the temp by a specific amount...say for example 20 degress. If the incoming air on a stock intake is 80 degrees, then the charge air would be 100 coming out of the turbo. But on a CAI-equipped car, if the intake air is at 60 degrees, them wouldn't the charge air only be 80 coming out of the turbo? Wouldn't that increase power (denser charge)?

What else would negate that power increase? How does extended piping have a negative effect if the flow volume/rate stays the same or better than the stock intake?

http://forums.nasioc.com/forums/showthread.php?t=477393
http://www.cobbtuning.com/info/?ID=3223
http://www.ecutek.com/tuning/induction/

[Radioactive Man]

Originally Posted by droptop335

OK, I'm not saying you're wrong, but I just want to understand. A turbo will compress the air and heat it as it does so. I understand that it always increases the temp by a specific amount...say for example 20 degress. If the incoming air on a stock intake is 80 degrees, then the charge air would be 100 coming out of the turbo. But on a CAI-equipped car, if the intake air is at 60 degrees, them wouldn't the charge air only be 80 coming out of the turbo? Wouldn't that increase power (denser charge)?

What else would negate that power increase? How does extended piping have a negative effect if the flow volume/rate stays the same or better than the stock intake?

I believe there problem here is we're not talking about a linear temperature rise when compression takes place. When dealing with the high levels of pressure in boosting, you'd most likely only see a few degrees difference from the different atmospheric temperatures brought in from the CAI.

[droptop335]

Maybe I'm mistaking a true CAI for something else. I'm talking about leaving everything else in the intake system intact (MAF, air box, filter etc), and just running the intake pipe out to a location that draws cooler air than is available in the engine bay. Assuming the air flow and volume stays the same, shouldn't this provide a cooler, denser charge air?

[HyperM3]

Originally Posted by droptop335

Maybe I'm mistaking a true CAI for something else. I'm talking about leaving everything else in the intake system intact (MAF, air box, filter etc), and just running the intake pipe out to a location that draws cooler air than is available in the engine bay. Assuming the air flow and volume stays the same, shouldn't this provide a cooler, denser charge air?

Thats more of a ram-air system. However, BMW designers already made the best one possible as it goes straight with hardly any bends right to the kidneys.

[droptop335]

Ummmm....Why was this thread moved to the NA subforum?

[elucas730]

Cause mods here are clueless

[judec]

the stock intake is cold air intake by design

[wj4]

Originally Posted by HyperM3

See, a lot of people think that its ok because the air is going through the intercooler anyway. Therefore, the hot engine air isnt "techincally" going into the engine. However, I still think theres no way you can cool it down that much especially as the engine gets even hotter. Until then, Im happy with the stock intake and an aftermarket panel filter.

Most turbo cars have found the aftermarket CAI intakes to actually lose HP. Sure you can get a really cool looking carbonio intake for $400 to show off when you open your hood. But when its closed, nobody sees it and you feel the drop in power.(Im referring to the A4's that a lot of us owned previously)

I do agree with you. I had an AEM intake on my Evo just for giggles and the fact that I got it for $40. The car was noticeably louder, but as far as gain...lol, it's very minimal, if any.

With a turbo'd car, there is bigger things to go after, ie turboback, ecu tuning, etc.

The only reason to go with an aftermarket intake is if you upgrade the turbo and absolutely need bigger diameter tubing, IMO.

[wj4]

^Yes, you can. An intake is considered as a very minor modification.