I gotta agree...something else is going on here.
This is strange...

 

OK, I tested my set up with the fan mod.

Pulled into garage at 195, shut the car off with fan mod going and pump going at the same time.

Within 3 minutes temp rose to 210, stabilized for 1 to 2 minutes and then went down to 180 within 5 minutes. My suspicion is that it's the turbos that are causing the high temp spike after shut down. With coolant circulating, this would show an immeadiate decrease in temp.

I need to datalog this heat soak after shut down and plot it over 20 minutes to see the total effect. Will do this later and report back.

 

any more info on how much of a difference your setup is doing?

 

does this mod work even if you do not have your temperature control turned to full heat in the cokpit. I would think that this route would be bloced by a valve if the control was not turned to full heat to open it. Am I right or is hot coolant always flowing through the heater core and we are just opening an air control damper when we turn the temp control.

Also, how did you wire in a timer. I was thinking about doing it this way or just using a temp sensitive relay that was tapped into the Thermostat housing. This way if the temp never got above 200 lets say, then the pump won't come on. Any body do this or tap into the stock fan temp sending unit. This one will bring the fans on at 225 and could also trigger the pump. I heard you can change this out for one that comes on lower like 205 deg.

I just started searching but this seems like a good place to ask

Mike.

 

See my answers in the other post.

As for the timer, I'm not running a timer. Running a fan switch relay available from Summit Racing for $40.00. The relay comes with an adjustable sensor probe. The probe could be inserted into the fins of the radiator but in my case, I just taped it with alumninum tape to the filler neck as this is the hottest spot (due to the turbos) and wired the relay to turn both the fans and pump on.

 

Poman..

Would you recommend this MOD. For FD's that
have regular coolant/water mix???
This mod would be great for any kind of heat soak
Evans NPG or regular coolant. right????

Since you are in DC.. If I bought the parts..
Think you could install it for my FD??

thanks

BTW any side effects or problems since this mod?

 

Yes, I would recommend it. However, you need to get silicone heater hoses for connecting to the pump.

Re: side effects - if you're running a small PC680 battery, it might drain it if you have both the pump and the fans running after shutdown. I haven't had the problem even though I'm running a 1/2 sized battery.

Re installing: sorry, can't help you there but any good mechanics should be able to do this.

 

I had noticed this too. My temps spike up after shutdown but I saw it on my PFC instead of a separate boost gauge.

Even with the fan running, I was seeing an increase up to around 100 deg C with a normal operating temperature of 86-87degC and ambient air of 64 deg C. (sorry running off PFC so all temps are in celsius)

What I did was after I had idled the car for two mins, I turn it off and watch the temp rise keeping the fan on. Then I fired her up briefly for about 30 seconds just to get the pump going. After two-three repetitions, the temps stay at around 87 deg C with the motor off.

Maybe I can build an independent circuit that will operate, based on temp readings, the fans and the pump in a cycle as to avoid battery drain.

 

I do ^^^ that as well but just only after spirited driving and if I have the time, I only do it once though, not start-off-start-off cycles.

I shut off, put he switch in ON and wait for the fans to come on. Pop the hood open and let it vent for a while, then fire her up for a few secs, shut off and wait again; everytime I do it the fans stay off so I don't rinse and repeat.

I don't have an aftermarket temp gauge though, I go by the fans. I do have a miata thermoswitch so the fans turn on at 207 F instead of 221 F.