E87 + K&N e-2021

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Manufactured from 2004 to 2013

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Masscanpass
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E87 + K&N e-2021

Post by Masscanpass » Thu Jul 16, 2015 8:50 pm

Hey guys,

I fitted a K&N filter today and wanted to share my results and double check the final fitting with you guys. I wanted rid of the factory airbox. The air flow sensor unit pulled nicely out from the factory airbox and then back onto the air hose, minus the airbox. The new K&N then fits nicely on the end of the sensor unit attached to the hose. (See after photo).

My one question is, is this setup ok basically hanging? It moves around a little but I have made sure it is not rubbing or hitting anything else in the engine bay. Or is it worthwhile making a support arm to connect from the sensor unit to one of the factory airbox mounting holes in the engine bay? I'd rather not but if the current setup isn't stable it would be good to know.

Here are my before and after photos followed by before and after videos:

Before: https://www.flickr.com/photos/134104822 ... res/iH8y1Q

After: https://www.flickr.com/photos/134104822 ... res/H44S4X

Before: http://youtu.be/wt8_bnkTM4A

After: http://youtu.be/7dM4J-R3Ukg

Comments and advice welcomed!

Cheers!

Scott
2007 E87 116i, K&N, L7 Tweeters, Black Kidney Grills

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BMWilluminati
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Re: E87 + K&N e-2021

Post by BMWilluminati » Thu Jul 16, 2015 9:12 pm

Hi Masscanpass,

I'm a noobie and no engineer/mechanic by any means but just couple of thoughts on it and also other ideas I've seen.

I guess it is ok hanging but surely would put a strain on joints and component parts,possibly warp them over time with heat/movement e.t.c which could cause small splits and tears? So maybe make a support from aluminium and screw it into a suitable place?

Also with air intake, like other K&N kits I've seen with airbox fully removed, the cone surely sucks in a lot of hot air being that the nozzle from the air scoop to the filter has no line of sight?

So perhaps prefab a heatshield/directional air channel to push the air towards the filter as opposed to throwing cold air into a hot space filled with hot air?

Like I said no expert but just thought I would make suggestions based on what I have learnt and seen! I was and I am still considering a 57i kit but keeping half the airbox and prefab a heatshield or just cut up the top half of the airbox :)

Cheers,

Adam.
118D with stuff done
My progress thread:
viewtopic.php?f=19&t=75479

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Joe
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Re: E87 + K&N e-2021

Post by Joe » Thu Jul 16, 2015 9:52 pm

You'd have been better off with a panel filter (cone/direct replacement). Still gets the air supply then. Not ideal having it bouncing around but can't see it doing any real harm.
2010 118i ///M Sport

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Masscanpass
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Re: E87 + K&N e-2021

Post by Masscanpass » Thu Jul 16, 2015 9:58 pm

Hi Adam,

Thanks for the reply! Yeah I think I'll make up a support arm, the 57i kit comes with a shield which also supports the filter at the same time so it might be wise to almost replicate this in some way? Still have the factory box but I don't know if I want to go hacking it up as I may want to go back to factory set up one day (i.e if I want to sell in the future).

I'm loving the sound this set up is creating too so I'd be keen to make it as functional as possible and get as much cold air as possible aimed at the filter as possible!

Cheers!

Scott
2007 E87 116i, K&N, L7 Tweeters, Black Kidney Grills

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BMWilluminati
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Re: E87 + K&N e-2021

Post by BMWilluminati » Thu Jul 16, 2015 10:09 pm

Masscanpass wrote:Hi Adam,

Thanks for the reply! Yeah I think I'll make up a support arm, the 57i kit comes with a shield which also supports the filter at the same time so it might be wise to almost replicate this in some way? Still have the factory box but I don't know if I want to go hacking it up as I may want to go back to factory set up one day (i.e if I want to sell in the future).

I'm loving the sound this set up is creating too so I'd be keen to make it as functional as possible and get as much cold air as possible aimed at the filter as possible!

Cheers!

Scott
Scott,

Yeah my thoughts exactly something small and inconspicuous! I was considering going to a breakers to get the top part of the airbox and create a custom air box to hug around the filter then put a metal shield over the top so you have minimal dirt/hot air entering from outside the box.

Same as, have to let me know how you get on! I'm going to get mine end of this month and probably do the airbox idea before I fit it :)

The heat shields I was considering are these, most likely the cheaper one lol;

http://www.ebay.co.uk/itm/Aluminium-All ... 0794940647" onclick="window.open(this.href);return false;


http://www.ebay.co.uk/itm/Quality-Unive ... 1438662560" onclick="window.open(this.href);return false;
118D with stuff done
My progress thread:
viewtopic.php?f=19&t=75479

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Re: E87 + K&N e-2021

Post by tomolfc1 » Fri Jul 17, 2015 8:49 am

I have that filter on mine, it really should be inside the air box for best results, am sure this has been covered before Marco might be able to shed some light am sure he answered the last time this was asked
E87 116i SE 2006 Sydney Blue, Pro HU Upgrade, K&N Air Filter, 256 Alloys, Front Tweeters, Puddle Lights, Stubby Aerial, Full Interior LED Lights, Camber Pin Mod, Darklines, Cup Holders, Remap, HID's

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Re: E87 + K&N e-2021

Post by THETYRANT » Fri Jul 17, 2015 11:30 am

Put the stock airbox and filter back on and your car will run better :D.....having a open cone filter under the bonnet like will rob power due to sucking in hot air, also sounds like a corsa chav lol :D

Ian
--
Now on my 3rd 130i, this time a nice E81 in Graphite, Previously 2 x 130i and 2 x 135i

Camber plate project - http://www.babybmw.net/viewtopic.php?f=20&t=96465

Suspension Quest thread - http://www.babybmw.net/viewtopic.php?f=20&t=80208

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Re: E87 + K&N e-2021

Post by Twenny » Fri Jul 17, 2015 1:05 pm

^^^ haha a 'chorsa'


2010 E82 125i modded by Babybmw.net
2010 125i E82 Coupe M Sport Black
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My build thread - http://www.babybmw.net/viewtopic.php?t=60951

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Re: E87 + K&N e-2021

Post by Masscanpass » Sun Jul 19, 2015 12:05 am

Hey guys,

Quick update. I have made a support arm for the filter which now supports the weight as opposed to it just hanging there off the intake tube. Need to paint this black. I have also modified the flexi pipe that used to connect to the factory air box so that cold air gets diverted down towards the filter (still need to cap the end of this so the air only flows down.

Cant say I've noticed any loss or gains in power but my MPG has gone from 30 to 32.7! Acceleration seems a bit more responsive also and the car is definitely "breathing" better!

Next I plan to put a cone filter heat shield on the under left hand side of the filter to deflect some of that engine heat away.

I'll keep you updated as I modify the rest if the car! Need to get rid of these 16" wheels next!

https://flic.kr/p/waY3B9
https://flic.kr/p/waY3vC
https://flic.kr/p/waY3mj

Cheers!

Scott
2007 E87 116i, K&N, L7 Tweeters, Black Kidney Grills

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Re: E87 + K&N e-2021

Post by 116imsportdood » Thu Apr 05, 2018 3:33 pm

Looks cool mate, Just bought my KN filter and going to try this for the craic....might not sound as good as yours like. :band:

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Re: E87 + K&N e-2021

Post by jason@bwchiptune » Thu Apr 05, 2018 9:47 pm

You will damage your air mass meter as the K&n as oil in the elements and as it is only picking hot air you will also loose power

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Re: E87 + K&N e-2021

Post by Dan116i » Thu Apr 05, 2018 10:05 pm

I had this on my old 116i. The filter actually fitted inside the existing air box, preventing heat soak
Now: 2006 130i with even more goodies ;)
Gone: 2008 116i with goodies :)

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Re: E87 + K&N e-2021

Post by Toed64 » Fri Apr 06, 2018 10:07 am

The only 'pro' of fitting a cone air filter to most cars is the induction noise 'improvement'. Fuel injected n/a motors are very sensitive to induction air flow and temperature so the original air box is tuned to optimise these and deletion of the air box can really mess up the fuelling.

I have just adapted a GSXR Suzuki airbox and filter to fit the R1 Yamaha engine in my Riot kit car. It replaced the 'race' style foam air filter tube that the previous owner had fitted. The rolling road proved that this increased the power output of this little 1 litre engine by almost 15bhp, with no other mods! With a bit of rolling road time, the engine was producing more than 30bhp more that had not been available with the foam tube. It also has the benefit that my left ear does not bleed from the the induction screaming only 30cm from my head and popping the noise meters at my local track

Listen to the expert opinions: for example, Jason at BW Chiptune is one of the country's leading BMW tuning specialists and a BMW master tech, Ian is our suspension/brake guru, & has opinions well worth hearing.

I know you won't do it, but your little car would be faster with narrow tyres to minimise power wastage (ala Lotus Elise & Caterham 7) and would accelerate faster if you fitted smaller diameter wheels! Most of the lightweight racers are running 13" wheels with tall profile tyres now, they have binned their huge wheels with rubber bands.

If you want your car to be faster point to point, go the the aftermarket mods section of the forum and read Ian's suspension quest thread, then his camber plate thread, then his brake thread...

Have fun.
2008 E81 130i
2010 E82 135i - now sold

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Re: E87 + K&N e-2021

Post by 116imsportdood » Mon Apr 09, 2018 1:10 pm

Dan116i wrote:
Thu Apr 05, 2018 10:05 pm
I had this on my old 116i. The filter actually fitted inside the existing air box, preventing heat soak
Yeah this is what I was going for.

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Re: E87 + K&N e-2021

Post by 116imsportdood » Mon Apr 09, 2018 1:13 pm

jason@bwchiptune wrote:
Thu Apr 05, 2018 9:47 pm
You will damage your air mass meter as the K&n as oil in the elements and as it is only picking hot air you will also loose power

BW chiptune
Tuning BMWs since 1991
Dyno Dynamics rolling road.
BW autorepairs
Over 30 year repairing BMWs.
New and fully refurbished BMW/Alpina ,Ecus (DME,DDE)and Cas units.
BMW Ecu repairs.
BMW remote Keys made and cut same day with or without car even if all keys lost we can supply you a key like the dealers do.
Key data fixed for non starters or when theft attempted.
Correction of Engine ECUs Cas and key fitted to your car (when a key set from a different car has been used).
Digital Service Records rest and corrections in idrive screen on 2013 onwards cars.
DPF repairs fixed without the need of removal of its guts or replacement.
40% of my work is repairing the problems that are caused by other tuners remap

For more info look in our section under sponsors on this forum

0208 561 1818
07831 103030
Hayes
UB3 1BB

Sent from my iPhone using Tapatalk Pro
Fair play mate, thanks for the input.

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