Time Delay Relay - Anyone use them?

[wesinls]

Trying to think about all the wiring I'll be doing on the car - and unlike the Holley system I have now, the trigger for the fans will come from two different sources (or so I think) - one from the factory Honda ECU from what I've been told is 205, and for the 2nd fan I plan to put one of those thermal ground switches on a radiator bung at say 180.

Issue is when you turn on ignition and go to start and having the fans running, not ideal...Some people have their fans on a switch - which scares me (if you forget and not paying attention).

I am thinking of using one of these time delay relays - say 10 seconds...given the car time to start, settle down a bit, and then fan(s) kick on....it looks like this relay can do both delays - i.e, have fans stay on for x amount of time once ignition is off, or delay x amount of time on after ignition.

 

[Kraut_n_Rice]

Used plenty, not that particular one though.

Delay on or off are different models. One doesn't appear to do both.

If you wire it the way you noted in your first sentence, you would need to put this on both circuits, OE and 180.

 

[wesinls]

Used plenty, not that particular one though.

Delay on or off are different models. One doesn't appear to do both.

If you wire it the way you noted in your first sentence, you would need to put this on both circuits, OE and 180.

Yes - noticed after my posts its two different relays - and both part numbers on that screenshot.

 

[Cookie]

I have both fans come on at 180, very little surge on the engine. Get the 180 degree sensor for the Honda.

When I ran the 205 sensor, the engine would not start cooling until 212 or so, then it would cool down to 205 and fans would turn off. With a turbo, you are putting out a lot of heat. I changed radiator, fans, water wetter and so forth and it ran way too hot. One fan will not cool the engine back to 180 when hot when you are trying to cool the turbo down, at least that is my experience, keep it simple.

When running hard, I am running at 205 and upwards to 210 even with 180 sensor

 

[EastMT]

Mishimoto makes a replacement fan switch that turns on at a lower temperature than OEM. I do like the idea of having one fan turn on at a lower temp though.

 

[Arch Stanton]

I have a fan switch that turns on the fans at 50% at a set temp and then Slowly increases fan speed as temp increases
I really like how much less fan noise is created with 2 fans at 50% it is way less noise than one at 100%

 

[MPC]

I have a fan switch that turns on the fans at 50% at a set temp and then Slowly increases fan speed as temp increases
I really like how much less fan noise is created with 2 fans at 50% it is way less noise than one at 100%

This sounds great! Can you point to where I can get that type of switch?

On mine.. I currently have the fans on a manual switch because I like to have more control of when they come on. I have a Honda V6 and as mentioned, the ECU triggers the fans to come on at 205 degrees. That's a bit late for my taste; that's why I have the manual switch. But as a safe guard, I wired the ECU 205 degree trigger wire to a red idiot light on the dash. If that light comes on, I know the temp has hit 205 and I forgot to flip the manual fan switch.

 

[Arch Stanton]

I’ll look at the car tomorrow it’s been on the car about 10 years also a v6 turbo 3.5 Honda
I just looked up digital fan control on summit racing site it looks like at least 3 companies make them