02Pilot Reader
Nov. 24, 2010 11:19 a.m.

...those of you with M54-powered BMWs, that is. If you're active on the BMW boards, you'll know that the factory VANOS seals were made from a material that degrades in the presence of oil; not exactly a good design decision. While BMW has decided to do nothing about this, a third-party company (Beisan Systems, in which I have no financial interest (end disclaimer)) now produces updated seals made from more appropriate materials.

Having recently done the work on my 525i, the difference is nothing short of astonishing. The idle is smoother, the power below 4k is notably better, the intermittent off-idle stumbling is gone, the engine is quieter throughout the range, and the oscillating idle when cold problem is completely gone. I did not even realize how pronounced these issues were until they disappeared.

Beisan has an excellent DIY on their site. It took me about 4.5 hours to do the swap. Those with single VANOS can upgrade as well, but special tools are required; double VANOS can be done with basic hand tools.

This is one of those jobs I never would have put off as long as I did had I realized how big a difference it would make. Do it. Now.

You'll need to log in to post.

Also on Grassroots Motorsports

Follow Us to the Nürburgring

10 hours ago in News

Follow along as James Clay from BimmerWorld contests his first ADAC Zurich 24-Hour race at the Nürburgring.

You Need This: 2005 Lotus Elise

10 hours ago in News

A Lotus Elise looks so right in British Racing Green.

2017 Mazda MX-5 RF

12 hours ago in New Car Reviews

We're big fans of the Mazda MX-5. Now Mazda went and put a retractable fastback on their fourth-generation car. So, ...

From the GRM Vault: Test Driving BMW's E30 M3

15 hours ago in Articles

We tested BMW's E30-chassis M3 back in 1989. Here's what we thought.

Project Ramp Truck: Installing Sound Deadening

16 hours ago in Project Cars

Time to cut down on heat and road noise making its way into the cab.

Eric Foss Sets Fastest Time Ever at the Tire Rack Ultimate Track Car Challenge

1 day ago in News

47 of the country's fastest cars battled it out for track supremacy.

Who Wants to Design the Next GRM T-Shirt?

1 day ago in News

Blipshift is involved, so you know that it will be cool.

Reader's Ride of the Week: Improving Upon the Ultimate Driving Machine

1 day ago in News

This E36-chassis M3 just keeps getting better.

What Was the Most Powerful Car at the Grassroots Motorsports Dyno Day?

1 day ago in News

What if we told you it was an Audi?

Up to the Challenge

4 days ago in Articles

Torque: It's how Glen Bunch's vintage Dodge keeps pace with today's machines.

This Friday: The Ultimate Track Car Showdown

5 days ago in News

Come watch some of the country’s top track cars duke it out for fame, glory and some tasty prizes.

You Need This: Metallic Brown Toyota Celica

5 days ago in News

This looks a lot like one that we had in our fleet back in the day.

OUR SPONSORS

Grassroots Motorsports Magazine

Subscribe Today

Also get your instant access to the digital edition of Grassroots Motorsports Magazine!

Learn More
GRKuas0pl4M7WRQvF3hBvfUTGooAE9dW