ICM: what does the 'temperature sensor cooling liquid' control?

[Anthony]

hello,
while looking into the schematics of the ICM, i notice that there is a Pink/white wire connected from the 'temperature sensor cooling liquid' in the thermostat housing, to the ICM.

so i am not reffering to the thermostat switch in the radiator that triggers the fan, not the thermosensor, but the sensor in the thermostat housing, part nr 36151-MT8-003.


what does the OEM ICM do with this signal ?
is it to change the advance timing based on the temp ?
or anything else??
some safety stops when to hot ?

is this the same wire the ECT mod uses to trigger the ICM into believing it is cooler to advance timing?

just trying to figure out if this is really needed or not on the blower bike.

thanks in advance,
Anthony

[sandy]

It holds the timing advance back until the temps comes up. That's why I always use the stock T'stat on any vehicle. As to a blower bike, the stock ICM isn't used. I'm clueless what to do with it.

[BonS]

The ECT sensor goes directly to the ICM to retard ignition timing based upon engine temperature. It is used by the Dyna 3000 as well as the OEM ICM. The Dyna has an additional input for retarding the ignition timing based upon boost and this wire exits the Dyna separately from the OEM harness. It doesn't have any function based upon overheating. I would keep it attached to avoid detonation at cooler temperatures when your mixture will tend toward being lean.

[98valk]

it adds additional advance when cold, it doesn't retard the ignition.
It shuts off the additional advance when temp is about 160F or rpms go above approx. 3500 when temp is below the 160F
see ignition curves

http://timskelton.com/valkyrie/tech/trigger_wheel_plus_dyna3000.htm

[Anthony]

Thanks for the info.
I have a dyna laying around, but i can't use it on my F6C, due to some differences in the wiring between US and EU versions.

So i found a local supplier that builds programmable ICM's, for a lot of older bikes.
They built me a connector between the OEM plug for my ICM, and their ICM unit, but it does not use the pink/white wire for the cooling temp sensor. 
On the other hand, now i can add a 'air intake pressure sensor' in the blower manifold, to measure the boost, and adjust the timing, based on the boost pressure. 

I will mount it and have it programmed at a specialised tuner with a dyno, and see how it works without that temp sensor.

I will keep you updated on the outcome.
Anthony

[BonS]

it adds additional advance when cold, it doesn't retard the ignition.
It shuts off the additional advance when temp is about 160F or rpms go above approx. 3500 when temp is below the 160F
see ignition curves

http://timskelton.com/valkyrie/tech/trigger_wheel_plus_dyna3000.htm

Thanks for the info and correction CA. That's helpful.

[98valk]

it adds additional advance when cold, it doesn't retard the ignition.
It shuts off the additional advance when temp is about 160F or rpms go above approx. 3500 when temp is below the 160F
see ignition curves

http://timskelton.com/valkyrie/tech/trigger_wheel_plus_dyna3000.htm

Thanks for the info and correction CA. That's helpful.

I have and use a Dyna and have the instruction booklet. The white wire advance/retard feature can be programmed from 0-10 degrees. I use it so that 10 degrees advance is added at highway speeds by flipping a switch on top of the clutch housing, switch off 10 degrees retard. depending on how its used, either advance or retard timing can be achieved.
So using a 6 degree modified OEM TW and the max dyna curve and the 10 degree switch. minus 10 degrees and its 1 degree above the I/S curve. plus 10 degrees and much better mpg. I have to look at my charts but I think it is about 32 degrees max.  A Goldwing GL1500 has a much better ICM with a vacuum advance function. with an aftermarket 6 degree TW it will be in the low 40 degrees for max advance, for even better mpg.
waiting for C5ignitions to finish their multi spark ignition system for our bikes.