Board logo

zetec thermostat sensors for megasquirt
andrenel - 20/11/06 at 01:27 PM

I am trying to wire up a megasquirt to my 2.0 silvertop zetec.

The thermostat housing has two sensors mounted on it , one on top and one underneath, which one of these should I connect to the megasquirt, and can the other one be used to control the radiator fan?.

Dusty - 20/11/06 at 02:02 PM

Top one is for the ECU. The one on the bottom corner is for the temperature gauge and won't work the fan. You need a third temp sensor effectively a temperature operated switch usualy mounted in the rad, top hose or thermostat housing to switch the fan relay.

andrenel - 20/11/06 at 03:31 PM

thanks for that,

I will use the top one.

guess I am going to have to tru easytherm as I am reluctant to mess with board.

Any other input re getting the squirt to work on my installation would be appreciated. I am using the stock zetec plennum.
I have not tried to do any of the setup for the megasquirt yet,Thought I would do all the connecting of sensors and then attempt the setup.looks like it might take some time and fiddling

Schrodinger - 21/11/06 at 10:24 AM

What rad are you using?
The POLO rad has a mounting for a thermostat for the fan

omega 24 v6 - 21/11/06 at 12:35 PM

quote:

The POLO rad has a mounting for a thermostat for the fan


Unfortuneatly thats no use for a Msquirt as it'll still be cold when the engines hot (before the thermostat opens).
As Mark said it needs a true engine (before the thermostat) reading.

andrenel - 21/11/06 at 04:05 PM

CHEERS

I am afraid I dont know what the radiator is from, I cant see any plugs to take a fan switch.
I will have to go down to corner shop and see if I can get a switch for the fan that I can tap into the plumming.


does any body know what the grey box on the side of the coil pack is, it is about the size of a match box and has 20 UF marked on it (capacitor) what is it for?


Going to use top sensor & easy therm to recalbrate squirt
I have readings like
214 k/ohm at freezer 0
19,7 k/ ohm at body temp 37 C
2,17 k/ohm at boiling water 98 c

do these values seem right

Schrodinger - 22/11/06 at 08:08 AM

quote:
Originally posted by omega 24 v6
quote:

The POLO rad has a mounting for a thermostat for the fan


Unfortuneatly thats no use for a Msquirt as it'll still be cold when the engines hot (before the thermostat opens).
As Mark said it needs a true engine (before the thermostat) reading.


I was meaning for the fan control BTW a new rad from Sweedish, German is about £60. The top sensor in the thermostat housing IIRC is the correct side of the thermostat so is at engine/head temp.

[Edited on 22/11/06 by Schrodinger]

[Edited on 22/11/06 by Schrodinger]