I thought I’d post this photo, kind of why I decided to go ahead now with the lightweight pulleys. If the RS5 had a harmonic balancer like my S5 or my RS6 I wouldn’t go with the lightweight pulleys but the RS5 pulley is not a Harmonic balancer. I took this photo while watching a show on Motor Trend Tv here in the U.S. called Engine Masters. They test all kinds of things like Mufflers, X/H pipes, Ignitions, Cams, etc… Most of the engines tested are big American Big/Small blocks with Carburetors but for non-boosted engines most of the physics still apply. The picture shows two acceleration rates, the faster rate is probably even more applicable to the RS5 but you can see both made gains.
3 Likes
Engine Masters is a great channel. Lots of myth busting stuff going on there. Some of the time they kinda gloss over a few things and I’ve seen situations where they kinda make opinions that the end results don’t show but the data is usually pretty good.
Great show. This is for what the pulleys they changed.
This is for reference what ball part you’d expect with the JHM LW crank pulley?
I can attest to the lighter feeling and more willingness of the 4.2 motor to rev with a nice chunk of weight removed from the crank.
Not only that but what’s not shown is that the rotational load improvements are even bigger at low low part throttle when the motor is at a disadvantage
Always great posts.
I’ve got the Aluminum DSG flywheel now but since I’ve got the front end off to install the new AC compressor, and ‘while I’m in there’ a new Waterpump/Thermostat assembly, I thought I’d do the lightweight pulleys too as hopefully I won’t need to pull the front end off again for years???