Herbmiester 909 Report post Posted March 30, 2021 (edited) My X5 40D went in yesterday for an intake manifold and intake port clean. I felt like the 306 hp just wasn't quite there and after looking at the intake ports with the manifold off it was clear why. For those of you who have seen N54 intake ports this will be very familiar, carbon and soot lined the intake port walls to around 20 to 30 percent of their volume. The valve stems were twice the size and the back faces of the valves were thick with carbon. The guy doing it has his own walnut blasting machine and is doing the ports tomorrow. He cleaned the manifold and it looked spotless as did the EGR and throttle body/ anti shudder valve. I will have some pictures in the next few days. Edited March 31, 2021 by Herbmiester 2 Quote Share this post Link to post Share on other sites
curryinahurry 38 Report post Posted March 30, 2021 Keen to see what kinda of improvements you get. I've been thinking about getting the same work done on my diesels as well. Quote Share this post Link to post Share on other sites
balancerider 701 Report post Posted March 31, 2021 Who did you use for this @Herbmiester? I've got the same engine in mine although it does almost no short running so hopefully not required for a little while... Quote Share this post Link to post Share on other sites
Herbmiester 909 Report post Posted April 2, 2021 (edited) I took the car on a road trip to Hawkes Bay. Idle and transition off idle are noticeably smoother, there is more power as you would expect and open road fuel economy went from 9.7 to 8.1l per 100kms. Will have the before and after photos next week. Edited April 2, 2021 by Herbmiester Quote Share this post Link to post Share on other sites
curryinahurry 38 Report post Posted April 4, 2021 That sounds like quite a drastic improvement! Keen to see the before and after photos when you get a chance. Quote Share this post Link to post Share on other sites
