whos interested if i make these?

[MattF]

Keep it simple and do what Andy has already suggested. Study those schematics.

Btw, think tank is the expression you were after on page four.

[dieselboy]

cheers mate!
is it possible someone hasa engine temp sensor they could post me for testing? then i can post it back when im done?

[MattF]

You don't need one. Look at the two circuits near the bottom of that page. The auto fan and the light meter circuits are both usable. The on/off selectivity can be adjusted. Rough resistances would serve to design around, if you can't get hold of a 'sensor'.

[dieselboy]

what page? have i missed something?
i would like to find the resistance of the sensor at a set temperature so i can get the circuit built

[MattF]

what page? have i missed something?
i would like to find the resistance of the sensor at a set temperature so i can get the circuit built

Edited my reply above with additional info. Just realised what you were referring to. Sorry.

[POPEYE]

Or.. you can buy fairly cheap digital thermometers from Maplin/ B&Q etc. mount display in dash and run wire (with temp sensor) to engine bay, tie wrap sensor to ...a rad hose/top of rad/ somewhere on the cooling system or even the head.
Keep an eye on the digital display to determine normal engine operating temp and should things start to go wrong in the future you have another temp gauge to refer to.

Hehe, no amount of simple solution ideas will stop them now, it's turned into a pi$$ing contest
Still reccon the fan wireing set up but with a buzzer/light or both would work ok, first determine a dangerous temp which would be===? 110-120c get a CPC temp switch around that value wire it through a standard and crossover relays, led/buzzer, switch and thats about all you'll need, the temp switches have a fair bit lower reset value so the relay wont "chatter" and the buzzer/light will stay on, if you use a double throw/double pole toggle switch you can have it on (set) switch it off (should it actually have to work, and it drives ya nuts while your stuck on the hard sholder) or test, three positions,
on, off, test,
only question is what value temp switch do you get and where do you stick it,

[MattF]

Hehe, no amount of simple solution ideas will stop them now, it's turned into a pi$$ing contest

Perish the thought.

There are far better alternatives that could be created, as he's starting from scratch with it, but that's his prerogative. Nev's suggestion of a combined coolant loss/temp alarm would be a far better early warning system.

[BUSHWHACKER]

Perish the thought.

There are far better alternatives that could be created, as he's starting from scratch with it, but that's his prerogative. Nev's suggestion of a combined coolant loss/temp alarm would be a far better early warning system.

My Lexus engine has a low coolant warning light/sensor.

[POPEYE]

My Lexus engine has a low coolant warning light/sensor.

Be that as it may!!!! but mines RED

[Apache]

Hehe, no amount of simple solution ideas will stop them now, it's turned into a pi$$ing contest

Not really, just suggesting reliable and accurate ways to do it rather than just sticking an LED in the dashboard.

You DO want an accurate way of saving your engine, rather than just another switch or LED to look pretty in a p1ssing contest of who's got the most switches and lights dont you?

The keep it simple suggestion is a good one, but only if 'simple' does the job properly. An LED and a temp sensor wont do it properly, but the circuits I posted links to will, with a bit of lateral thought in locating the sensor.

[MattF]

You DO want an accurate way of saving your engine, rather than just another switch or LED to look pretty in a p1ssing contest of who's got the most switches and lights dont you?

[plumb bob]

Check this thread out, may save a lot of time.


http://www.toyotasurf.asn.au/forum/v...ic.php?t=14717

[nero279]

Check this thread out, may save a lot of time.


http://www.toyotasurf.asn.au/forum/v...ic.php?t=14717

This bit sounds interesting

The mod works well in conjunction with a different mod I did some months ago which was to wire the aux fan feed up to a lamp on the dashboard. This comes on at around 98 degrees so if I dont notice that the guage has moved to near the red I will when a $$$$$$ great red lamp lights up. The fact that the aux fan and temp guage senders are separate senders gives a lot of confidence

i've currently got my elec fan sensor unplugged so it's on all the time, but wiring an LED to it is an interesting idea. I guess it'd be a case of a changeover relay to make the LED circuit when the sensor circuit is broken.

If making the factory gauge that much more accurate is such a simple job i'll give it a go, what's the opinions of those in the know circuit wise?? Apache?? MattF??

[MattF]

This bit sounds interesting
i've currently got my elec fan sensor unplugged so it's on all the time, but wiring an LED to it is an interesting idea. I guess it'd be a case of a changeover relay to make the LED circuit when the sensor circuit is broken.

That'd work fine. Relay would only draw negligible power from the battery when energised. Would need a permanent live to the relay coil, however, or an ignition switched live for the LED supply, otherwise it would come on each time you turned the ignition off too. Btw, I believe it's 102 degrees, not 98, which that switch operates at.

If making the factory gauge that much more accurate is such a simple job i'll give it a go, what's the opinions of those in the know circuit wise?? Apache?? MattF??

It apparently works quite well. Do a search for the mod on a LC. That info on the Oz site has a writeup somewhere, with diagrams. Can't remember where, but the mod was initially done on a Land Cruiser gauge, and they did a writeup for it.

[nero279]

That'd work fine. Relay would only draw negligible power from the battery when energised. Would need a permanent live to the relay coil, however, or an ignition switched live for the LED supply, otherwise it would come on each time you turned the ignition off too. Btw, I believe it's 102 degrees, not 98, which that switch operates at.

cheers, i'll have a play with that tomorrow then. Whatever temparature it is, it just let's me know when toyota reckon it wants extra cooling.

It apparently works quite well. Do a search for the mod on a LC. That info on the Oz site has a writeup somewhere, with diagrams. Can't remember where, but the mod was initially done on a Land Cruiser gauge, and they did a writeup for it.

took the guage out today to have a look, looks a simple job to replace the components on the board, well simpler than taking the dash apart to get to it anyway. Gauge is still out so i'll take some photo's before i put it back if anyone's interested.