Builds Well I gone and done it: 2018 Premium Build

[BigSwede]

See my post here (for my GX470). The Lenz snorkel will amount to your 1UR having to breathe through a straw. On my 470 it's at least a 40% reduction in cross-section area in one spot and a 25% reduction through the A-pillar neck (relative to the OEM air intake tube cross-sectional area). On top of that, it's super rough on the inside. Unless the Lenz somehow defies the laws of physics, it's going to provide a significant air flow and likely power restriction.

Mine will be going on eBay and I'll be getting a 4" stainless tube snorkel from Australia instead.

Interesting. Honestly I don't think it is that big of a deal. It's not necessarily a linear relationship between cross sectional area and airflow, but we'll see.

 

[Rednexus]

Interesting. Honestly I don't think it is that big of a deal. It's not necessarily a linear relationship between cross sectional area and airflow, but we'll see.

The air velocity will need to increase for a given RPM to make up for the reduced cross-sectional area of the Lenz (in a direct linear relationship). However, as air velocity increases, so do frictional losses. This friction to velocity relationship is linear under laminar flow, but when the flow turns turbulent, frictional losses increase by the square of the velocity. The friction losses will also be higher in the Lenz than in a snorkel with a smooth surface, since it is so rough on the inside, and the funky twists and turns in the Lenz will probably cause some additional losses and turbulence as well.

I am unsure of how much actual power reduction there will be, and a dyno would be needed to verify it. For me, it's just too much of a risk as the fender is ruined after installation. I was 80% sure it wasn't going on my rig when I opened the box....after 15 minutes of examining and tape-measuring, that went to 100%.

 

[BigSwede]

Kanab Creek trail, Utah.