Coolant temp vs thermo switch question

[MaxVmo]

I’m running a BPE 347 with Sniper. I’m getting into the initial wiring setup and laying things out so I can start to build a mental picture.

The sniper is currently wired (from BPE) with a plug into the “coolant temperature sensor.”

Am I correct in that this is not the same as a thermostat switch? I have a FF supplied thermo switch which I interpret as needing to be installed in the port just behind the radiator tube which will connect to the fan thermo switch. I think.

Trying to keep my sanity as the sniper install is like me learning Greek.

[gbranham]

Can the Sniper control the fan operation by using an input from its coolant sensor? That's what I'm doing with my ProFlo4 EFI system.

[MaxVmo]

Yes, the sniper can control the fan. That option is probably the better choice. I’m confusing myself looking at the RF harness fan thermo switch wires.

[weendoggy]

Yes, the sniper can control the fan. That option is probably the better choice. I’m confusing myself looking at the RF harness fan thermo switch wires.

Be sure to run that control via a relay. None of the Holley EFI is made to handle the load. You can also put a toggle to control inline with the Sniper to be able to turn it on anytime.

[gbranham]

Be sure to run that control via a relay. None of the Holley EFI is made to handle the load. You can also put a toggle to control inline with the Sniper to be able to turn it on anytime.

Good call. This is exactly what I did with the ProFlo.

[MaxVmo]

Thanks for the responses. I'm back on track now--the Sniper manual is a little vague but I also realized (with the help of my buddy at 520speedworks) that the Vintage gauges come equipped with the water temp sensor and oil pressure sensors. The Sniper sensor is separate and already installed, so that's good. I also realized that a lot of the wiring will not be used, so I will likely de-pin the ones I don't need to reduce any RF issues. If I just do one little thing at a time it seems to go much faster!

[phileas_fogg]

For Holley's Terminator system, their fan control wire provides a connection to ground when active - just like the thermo switch wire on the RF harness. To get the Holley system to control the fan, simply connect their fan control wire to one of the green RF thermo switch wires. The fan relay is already provided & wired up in the RF harness & fusebox. You can use the other thermo switch wire for a manual fan control if you want, or remove it.

Before wiring your fan up this way, double-check in your Sniper documentation that it works the same as the Terminator!


John

[Guardm16]

I am using the Sniper2 with the Power Distribution Module (PDM) It has build it relays and you can control the temperature you want the coolant fan to operate. At $153, it was a no brainer given the ease of wiring. https://www.holley.com/products/fuel_systems/fuel_injection/sniper_efi/ignition_and_fuel_systems/sniper_efi_service_components/parts/554-200#:~:text=3%20Relay%20Channels%20%2D%2015A%20Pow ertrain,Pump%20Output%20%2D%2025A%20Fan%20Output

The Power Distribution Module (PDM) is a cost-effective and optional accessory that isolates the core of your EFI and ignition wiring into one, easy to use location. Simply slide the stripped wire ends under the positive lock connector and tighten down the set screw.

It also distributes power to your EFI fuel pump and a single fan (second fan can be ground triggered through the included input/output harness). Two additional 2-amp circuits can power low current accessories like gauges or to trigger relays.

Battery and a switched 12 volt source are all that's required from your vehicle to power the PDM.
Features:
Provides conditioned Power, Ground and Switched Connections for ALL components within a Sniper 2 EFI Install. (Throttle Body, Fuel Pump, HyperSpark Ignition System, and Optional Fan)
3 Relay Channels - 15A Powertrain (Sniper Throttle Body and Ignition System) 25A - Fuel Pump Output - 25A Fan Output
LED status indicators, show you which channel is triggered at a glance
Removable cover for easy accessibility, with wiring diagram built into the lid, like a fuel panel.