Bogging engine after installing K&N cones...? - The Unofficial BMW M5 Messageboard (m5board.com)

kirbanana · 24th May 2007, 07:17

i got it installed in this manner real easy and quickly. $100 later, I have installed CAI for the beast. I took it for a test drive and suddenly I felt the car running rather heavy and slower than I expected it to. After 2 miles or so, the car started to bog heavily, sputtered through idle and ses light went on. I parked and had dinner, after that, the car ran fine going home but this time I didn't gun the car. Just normal driving. Did I do anything wrong? Help please.....

kirbanana · 24th May 2007, 07:41

got it. its a thing called turbulence in the air flow. i saw a write up using an AEM filter enclosed within the stock airbox. i guess i have to do that instead. i had the mentality that the more exposed the filter is, the more air it gets. i'll have to customize this one with a use of mandrel bent tubes going into the airbox then installing the filter from within. lets see what happens.

wentouch · 24th May 2007, 11:18

u are partially correct. the more the filter is exposed, the more aire the engine does get, but the filter needs to be exposed to cold air which is the purpose a isolated compartment exists for oem filters. the engine emits an abundance of heat which is reason exposed filters in the compartment would decrease performance in addition to affecting the sensor. cai is most efficient when the filter is moved behind the front grill or additional piping redirecting air to the filter itself.

4re308 · 24th May 2007, 15:37

The car should not run like that, even when it is inhaling hot air. It seems you have contaminated the MAFs or something. It should run no different with the K&Ns, only be a little louder. A DECREASE in power means something else is wrong.

Can a M5 guru chime in here??

ard · 24th May 2007, 16:04

Quote:

Originally Posted by kirbanana

got it. its a thing called turbulence in the air flow. i saw a write up using an AEM filter enclosed within the stock airbox..

Dude- the whole thread was a scam. The original poster was banned, virtually all attempts to add cone filters are either no gain or a loss.

You are pulling in hot engine air which will cause major power loss.

Stock is better

Or get a real Cold Air Intake (CAI) which will give you 5 hp.

A

J Irwan · 25th May 2007, 23:48

the problem is that the engine is sucking hot air from under the hood.
E39 M5 will generate significant heat under its normal operating inside engine bay. ether go to Dinan CAI or back to stock. There is a reason Dinan has long intake pipe that goes to the area behind the bumper.

Also I don't know if your new CAI filter is over-oiled, if it does say good buy to your MAF. To test it, just put paper towel to wrap the filter part to absord the extra oil (then you can tell how much over-oilled the filtes are). But I'd never put any oil-based contraption air filter on my beast.

Regardz,

J Irwan

VetteRacer · 25th May 2007, 23:53

Mine has a simular setup, except the filters are right off the MAFs, not in stock location... When its 100+ here I can REALLY feel the car down on power... No SES though.
Cant wait to get my Dinan CAI on and get some real intake going!

E55AMG2 · 26th May 2007, 01:08

Quote:

Originally Posted by ard

Dude- the whole thread was a scam. The original poster was banned, virtually all attempts to add cone filters are either no gain or a loss.

You are pulling in hot engine air which will cause major power loss.

Stock is better

Or get a real Cold Air Intake (CAI) which will give you 5 hp.

A

Correct, the limiter is the snorkel feeding from the front bumper. The only way to optimize the stock setup is with a K&N drop in filter. Beyond that, there is just not enough airflow capacity to make a difference. This is why Dinan eliminates using the snorkels altogether.

Performing Imports · 26th May 2007, 03:25

Quote:

Originally Posted by kirbanana

i got it installed in this manner real easy and quickly. $100 later, I have installed CAI for the beast. I took it for a test drive and suddenly I felt the car running rather heavy and slower than I expected it to. After 2 miles or so, the car started to bog heavily, sputtered through idle and ses light went on. I parked and had dinner, after that, the car ran fine going home but this time I didn't gun the car. Just normal driving. Did I do anything wrong? Help please.....

That is the best hot-air intake I have seen so far. The engine cannot run like that. You are pulling air directly from the exhaust. I am supprised it did not die. Reinstall the factory air boxes and use a dry non-oiled high flow filter element. Or you could install a proper cold air intake with appropriate engine software.

VetteRacer · 26th May 2007, 03:50

Quote:

Originally Posted by Performing Imports

That is the best hot-air intake I have seen so far.

Ok, I take that challenge, NOT with pride though... I've been too embarrassed to post this before now..
Here is the system the @sshole I got the car from had installed...
BUT on the bright side, the box below is going on very soon!