Under bumper mounting of FSD Heatsync

[Matt Bachand]

Has anyone remotely mounted their FSD Heatsync under bumper or somewhere outside of the engine compartment? I'm looking for a few ideas of where to put it ouside the engine.

Thinking of under bumper, but Hard to get fins to go the right way, maybe i'll fabricate something.

[sschevelleman]

Bad, bad idea!! Its NOT the heat of the engine that kills PMD's as you may have been mis-led to believe, it the PMD's own internal heat that does. The PMD contains 2-500 watt transistors that get hot enough to fry an egg and the bacon too! That internal heat must be drawn away from the transistors then dissipated by the fins. The FSD Heat Sync in the recommended location does just that. It is an engineered piece that is properly sized to work in an underhood environment exceeding 150DF. It must be mounted in an adequate airstream to dissipate that heat. Our stock location works great! Tests have proven the firewall or fenderwell does NOT provide enough flow of air to do that.

The under bumper mounts work great at 65mph. But if you do alot of stop and go driving in the summer's heat, the PMD will overheat and fail prematurely because there just is not enough air flow. I have also seen where a cold splash of water or worse yet slush, hitting a hot PMD causing instant failure from thermal shock.

No need to re-invent the wheel, our unit works!

[Matt Bachand]

I was just curious because I was thinking of summer time when you drive to a location, and turn the engine off, and the sun on the hood, plus the heat of the engine must get that engine compartment to 300df, where as under the bumper would be much cooler. Good point about the thermal shock though.

[Scrufdog]

not to step on the sponsor's toes.... but

I have a homemade heatsink sort of similiar to the competitors heatsink plates. I however mounted mine just over the skid plate, but near the bumper, to avoid the splishy splashy, while keeping it away from the engine heat. Gets good air in there too. I've tested it a few different ways. Checked after highway driving, after hours of slow traffic city driving, after idling for long periods of time...neither the FSD or the plate have ever gotten over ambient air temp. Seems to be doing a great job.

[Matt Bachand]

I'm going to move mine to the splash sheild, I got a watertight extension that is 6' long and moving mine with spacers to the splash shield. this way it will never deal with heat bath. I'll show pics when i'm done with my remote mounting.