View Single Post
  #58  
Old 07-26-2012, 09:59 PM
MySatinDoll MySatinDoll is offline
New to S5X Tinkering
Location: Next door bring tools and beer.
 
Join Date: Jan 2011
Posts: 1,354
Mein Auto: 1995 e34 S52b32/5
Quote:
Originally Posted by _Ethrty-Andy_ View Post
not quite true, but bang for buck yes you are right. a proper CAI for the E34 needs to be down below the valance etc


http://www.bmwe34.net/E34main/Upgrade/Air_filter.htm

Rob Levinson from UUC Motorwerks says that "it is really doing every E34 owner a disservice for three reasons:
First, conclusive tests from independent labs show that K&N filters, no matter how well-oiled and cleaned, let through huge amounts of large particulate that damages engines. Oil analysis shows 5x as much silicate contamination. Additionally, the oil from these filters tends to muck up the MAF and cause an engine-damaging lean-run condition.
Second, an open element filter like that sucks in hot underhood air and subjects the filter to "fan wash", the swirl that creates a vacuum effect. On the E36 M3, we measure a 15hp loss from open cone filters.
Third, the E34 airbox is designed with an integral velocity-stack style venturi at the opening. Running one of these engines on a dyno, you can cause a 5hp drop just from putting your finger on the stack lip. Removing that airbox undoes a lot of good BMW engineering. Yes, these filters make a "really cool" noise... but noise does not equal power. Stick with a stock paper element in the factory airbox, you're not getting any more power with a K&N garbage-filter, just damaging your motor."
Reply With Quote