[lordbmw]

Is the COBB drop in air filter worth the cost?
https://www.cobbtuning.com/products/...gh-flow-filter

I've always used OEM air filters.

Thoughts?

[Smgs1992]

Get dual cone intakes. The stock airbox is restrictive

[CarAbuser]

I think you're best sticking with the stock filer. I certainly wouldn't bother with a hot air intake, that's just money down the drain.

[Smgs1992]

Originally Posted by CarAbuser

I think you're best sticking with the stock filer. I certainly wouldn't bother with a hot air intake, that's just money down the drain.

DCI is dyno proven to gain 14whp on a otherwise completely stock car. Can post the video if you’d like.

Not sure where this idea of a hot air intake mattering on a turbo car. The air gets pulled through a burning hot turbo regardless where the intake is located. A good intercooler does far more to help IAT’s than an intake does. However pulling in more volume of air does help. Hence the huge gains we see from inlets

[roadkillrob]

Hiflow filters typically show no benefit in the stock airbox compared to a clean stock filter and potentially can allow more dirt to get through. The stock airbox is the limiting factor on flow anyway, so get a Z4 lid or an aftermarket intake if you want to spend some money.

[CarAbuser]

Originally Posted by Smgs1992

DCI is dyno proven to gain 14whp on a otherwise completely stock car. Can post the video if you’d like.

Not sure where this idea of a hot air intake mattering on a turbo car. The air gets pulled through a burning hot turbo regardless where the intake is located. A good intercooler does far more to help IAT’s than an intake does. However pulling in more volume of air does help. Hence the huge gains we see from inlets

This has been done to death across multiple topics. Any video that shows a 14whp gain is bullshit. I've seen comparisons done with the filter and lid removed completely that show no gain so not sure what magical shit they put into those ricer cones that produce all that power.

[Smgs1992]

Originally Posted by CarAbuser

This has been done to death across multiple topics. Any video that shows a 14whp gain is bullshit. I've seen comparisons done with the filter and lid removed completely that show no gain so not sure what magical shit they put into those ricer cones that produce all that power.

Not sure how someone fairly unfamiliar with the platform putting the same car on the same dyno on the same day doing multiple pulls showing a real world gain is bullshit

Dyno with intakes installed starts somewhere around 4:30

So if you wanna call someone out claiming something is bullshit bring back evidence to debunk this otherwise apologize and F off

Pulling the lid and filter off is not increasing the circumference of the area taking air in. Therefore it isnt increasing volume of air or CFM’s.

[CarAbuser]

It's bullshit. Not even the people who make those filters claim 14whp. You might gain 1 or 2hp from a less restrictive filter but you sacrifice filtering which means more debris heading through the intake. With the DCI you are also getting increased IAT which is always a bad idea.

Also taking the lid and filter off would be less restrictive that any filter. Doesn't matter how much surface are you create with the filters, you're still sucking it through the same pipework.

[Smgs1992]

Originally Posted by CarAbuser

It's bullshit. Not even the people who make those filters claim 14whp. You might gain 1 or 2hp from a less restrictive filter but you sacrifice filtering which means more debris heading through the intake. With the DCI you are also getting increased IAT which is always a bad idea.

Also taking the lid and filter off would be less restrictive that any filter. Doesn't matter how much surface are you create with the filters, you're still sucking it through the same pipework.

There is literally a video with dyno proof. Are you going to tell all those LS corvettes that gain 20-30whp from an intake theyre full of shit too?

Seriously how are you gonna argue with dyno proof from the same car, same dyno, same day back to back?

IAT’s argument is a fucking joke. Where does the air directly go? Into a hot ass turbo. It doesnt make any difference at that point. That is why turbo cars have intercoolers.
A 360degree area of taking in air is going to be more beneficial than than removing the lid and still blocking off the majority of surface area

[studio54]

why being agressive

Hmm there is one thing that i don't like in the video is that for the dyno with the DCI, the hood is open, which is not a real world situation.

Personnaly i prefer to run stock airbox over DCI, i switched so many times, and each times i prefered the way my car feels with the stock air box pulls after pulls....

[Wolf 335]

Don't forget to add air scoops. They alone add 10hp, filter or no filter.

I think i seen a video somewhere.

[CarAbuser]

Originally Posted by Smgs1992

There is literally a video with dyno proof. Are you going to tell all those LS corvettes that gain 20-30whp from an intake theyre full of shit too?

Seriously how are you gonna argue with dyno proof from the same car, same dyno, same day back to back?

IAT’s argument is a fucking joke. Where does the air directly go? Into a hot ass turbo. It doesnt make any difference at that point. That is why turbo cars have intercoolers.
A 360degree area of taking in air is going to be more beneficial than than removing the lid and still blocking off the majority of surface area

I can find you videos on youtube with "proof" that the earth is flat. Don't just take 1 video as proof. I personally would ignore any testing on a dyno with the bonnet up as you're not even close to real world conditions. In the real world the stock intake is getting cold air shoved through the snorkel whereas the hot air intake is sucking warm air from inside the engine bay.

The temperature of air going in makes a huge difference. The intercooler removes heat from the charge but the higher the intake temps get, the higher the air temp reaching the engine will be. Colder air in equals colder air out. The relationship isn't linear but it's still significant.

[Smgs1992]

Hood open compensates for the fact there isnt air rushing through the grills.
This isnt the only video i’ve seen with real world gains either.

What else is a myth downpipes and inlets? Tunes dont do anything either?

[Bimmer_Bro]

Originally Posted by Smgs1992

There is literally a video with dyno proof. Are you going to tell all those LS corvettes that gain 20-30whp from an intake theyre full of shit too?

Seriously how are you gonna argue with dyno proof from the same car, same dyno, same day back to back?

IAT’s argument is a fucking joke. Where does the air directly go? Into a hot ass turbo. It doesnt make any difference at that point. That is why turbo cars have intercoolers.
A 360degree area of taking in air is going to be more beneficial than than removing the lid and still blocking off the majority of surface area

Is there a reason you feel the need to be so toxic? People are allowed to form their own opinions from their own experiences.

There is a few things wrong with your statement. First yes air temperature into a hot turbo does matter. Say what you want but cooler air into the turbo means cooler air out of the turbo which means the intercooler can be more efficient.
It also does not matter the shape of your filter, round, square , oval, flat, It does not make "more air" go into the turbos. The piping from the intake to the cool side of the turbo can only handle a certain amount of volume. A round filter does not increase the volume of air being fed.
Of course the DCI is going to be less restrictive than the box, but i honestly dont feel 14hp would be real world conditions. Not event the manufactures claim those numbers.
I have swapped back and forth alot between my DCi and stock box with a drop in. Honestly i like the feel of the box better and that's my opinion. The low down torque is better and i think the DCI looks a bit ricy on a BMW. Also if you are sitting in traffic, those cones are sucking in hot air vs a closed system. The only place i see DCI as an advantage is once you are moving fast so there is lots of airflow in the engine bay, and in the higher RPM range.
Waste gate duty cycles and air temps are more important than the 10 hp you may be gaining at higher rpm.

Edit* one last thing I forgot to mention. I hated how fast my DCI got caked with dirt. If you live in a dusty climate, they get dirty very quickly. After a few months mine were not even blue anymore. So how easily they get filthy is also going to reduce efficiency.

[relative4]

Originally Posted by studio54

Hmm there is one thing that i don't like in the video is that for the dyno with the DCI, the hood is open, which is not a real world situation.

Strange, I find driving with the hood up slows me down significantly.

[lordbmw]

Wow, that was a bit more than I expected.
Let's be civil folks.

[Vivek.]

Originally Posted by Bimmer_Bro

Is there a reason you feel the need to be so toxic? People are allowed to form their own opinions from their own experiences.

There is a few things wrong with your statement. First yes air temperature into a hot turbo does matter. Say what you want but cooler air into the turbo means cooler air out of the turbo which means the intercooler can be more efficient.
It also does not matter the shape of your filter, round, square , oval, flat, It does not make "more air" go into the turbos. The piping from the intake to the cool side of the turbo can only handle a certain amount of volume. A round filter does not increase the volume of air being fed.
Of course the DCI is going to be less restrictive than the box, but i honestly dont feel 14hp would be real world conditions. Not event the manufactures claim those numbers.
I have swapped back and forth alot between my DCi and stock box with a drop in. Honestly i like the feel of the box better and that's my opinion. The low down torque is better and i think the DCI looks a bit ricy on a BMW. Also if you are sitting in traffic, those cones are sucking in hot air vs a closed system. The only place i see DCI as an advantage is once you are moving fast so there is lots of airflow in the engine bay, and in the higher RPM range.
Waste gate duty cycles and air temps are more important than the 10 hp you may be gaining at higher rpm.

Edit* one last thing I forgot to mention. I hated how fast my DCI got caked with dirt. If you live in a dusty climate, they get dirty very quickly. After a few months mine were not even blue anymore. So how easily they get filthy is also going to reduce efficiency.

To be fair I don't think anyone is counting HP's when they're sitting in traffic so that's a bit of a moot point. But everything else I fully agree with.

OP just replace the stock filter often. I've never agreed with the idea of a 'high-flow' filter--to properly clean the air it has a necessary impact on airflow.

[_N54]

Originally Posted by CarAbuser

With the DCI you are also getting increased IAT which is always a bad idea.

https://www.n54tech.com/forums/showthread.php?t=23993

[relative4]

Originally Posted by lordbmw

Wow, that was a bit more than I expected.
Let's be civil folks.

Welcome to the internet.

[studio54]

Originally Posted by ///S58

https://www.n54tech.com/forums/showthread.php?t=23993

Isnt n54tech BMS itself ?
For the idle test, i never logged this to test, but it's an easy test to reproduce for anyone, it should be true. The heatsoak tend to come from the FMIC on a not moving car anyway.

The problem is the test is only based on only one pull which is not enough to prove anything.

Personnally i don't complain about the first pull of the DCI vs stock airbox, i didnt complain about any first pull neither, even with the stock FMIC.

But when you do several pull, and you stop at traffic or stop light for a few minutes and when you do again pulls and so on, when it's summer vs winter..... i doubt the DCI will have the same temperature as the stock airbox.

That said, if IAT doesn't matter because air goes into very hot turbos, why our turbos cars are faster in winter than in summer ? (even with a good FMIC)

For me, it means that even if it goes in hot turbos, the IAT difference matters.

[CarAbuser]

Originally Posted by ///S58

https://www.n54tech.com/forums/showthread.php?t=23993

Not a surprise that the guy who builds and sells the intakes finds data that shows his intakes are worth buying

[Saif2018]

Originally Posted by CarAbuser

Not a surprise that the guy who builds and sells the intakes finds data that shows his intakes are worth buying

Others have found the DCI's do produce more power and flow better than the stock air box, but the Hot air guys dismiss it all,