Relocation of coolant temp sender

[J400GED]

In order to improve the accuracy of the coolant temperature gauge, could somebody tell me where the standard coolant temp sender is (picture with arrow would be good) and also where the alternative position that has been mentioned on other posts is ( again a picture with an arrow would be good)? Also, if someone could give me details of the 120 ohm resistor that has been mentioned before, that would also be very much appreciated.

Cheers,


Ged

[haircutmike]

Ged,

You need alex, (daredevilz), he did his then mine, works really well!

He may reply soon as we obviously haven't a life or pm him.

[Alexdaredevilz]

Hello

The RR sender is next to the thermostat housing

I think I used either a 100/120/150 ohm resistor I think it varys slightly on what sender you have and condition,

I have a few if you want one

I would take a picture but its far to hot to move, and currently iam sitting in my boxers with a fan in my face!

Edited by Alexdaredevilz on Tuesday 28th June 00:01

[J400GED]

Alex,
Presumably I just fit a new temp sender in the RR location and plug in a 120ish ohm resistor in the loom - is that it in a nutshell?
Presumably the RR location has the same thread as the standard location?

Pics showing the current location (for me to disconnect the loom) and the RR location would be very helpful if you could.

Ged

[haircutmike]

Ged.

Even easier, the RR sender is already in the manifold!

[J400GED]

Gents,
Thanks for your responses.
Peter, are you saying I should already have 2 temp senders fitted, and TVR chose to wire up the "less efficient" one?


Location pics would be very handy if you could please chaps.

Ged

[haircutmike]

Yep!

I'll leave the pics to Alex

You will find it quite easily, just behind the dizzy if I recall.

[J400GED]

Alex,
A resistor would be much appreciated, thankyou.

I'll pm you my postal address.

Ged

[lotusandy]

Just bear in mind that your temperature gauge may respond better due to the improved location of the RR sensor, but as it is not matched to the TVR gauge it will only actually be accurate at 1 temperature..

Andy

[haircutmike]

With my resister, (that I will change when I can be arsed so it reads about 80) temp goes up to and sits at 90 even when fans come on.

This seems more realistic, when did you have a car where the temp gauge roamed up and down!

[J400GED]

Thanks Andy, but I thought the purpose of the resistor was to "tune" the sender to the gauge


Ged

[J400GED]

Alex,
Thanks for the offer of a resistor but I found one at work today.

Cheers,

Ged

[Alexdaredevilz]

I used a laser thermometer at one end and got Peter to read out the gauge with different restisors to make sure I got it right I think I ended up with 100 ohm

Let me know if you need any as I got a strip of 100 120 and 150

That offer goes to others aswell

[CarlosV8]

Don't suppose I could grab a resistor or two? Would save me going into town to Maplin. I think my standard temp sender is on its way out, so an ideal time to revert to the RR one instead!

Cheers
Carl

[Alexdaredevilz]

CarlosV8 said:

Don't suppose I could grab a resistor or two? Would save me going into town to Maplin. I think my standard temp sender is on its way out, so an ideal time to revert to the RR one instead!

Cheers
Carl

No problems, pm your address or pop over

You can't but them at maplin, I ended up buying 30 off rs components plus a min order fee :-(

[Naybr]

I got a suitable resistor at Maplin last year. I just asked for their biggest wattage wirewound 100 ohm. The Rover sender works well BTW - a really useful and simple mod.

[lotusandy]

J400GED said:

Thanks Andy, but I thought the purpose of the resistor was to "tune" the sender to the gauge


Ged

It is, but the as sensors are non linear and the 2 sensors have different curves, all you are doing is frigging the gauge to read roughly correctly at one given temperature, at any other temps the reading will be less accurate the further you move from the calibration temperature.
With this is mind I cant see the merit of doing this mod... but then I am an electronics calibration engineer & our calibrators are accurate to 4 parts in a million, so I tend to see things slightly differently sometimes..

Andy

[Pupp]

Why is the alternative sender thought to be in a superior position? I've never noticed particular problems with the original position TBH...

[spend]

I think a certain expert has banged on about that Gary and folks have blindly jumped on the wagon, I've never seen it either.. Arguably either original location (preserp/serp) is in better location for flow and submersion (behind + below the stat) than the LR one which could (and has been known) to sit in an air bubble IIRC.

[J400GED]

Spend, what do you mean ".....and folks have blindly jumped on the wagon, I've never seen it either.. ". Just because someone picks up on a topic which makes sense to them as being a good idea, are they blindly jumping on the band wagon just because you haven't seen any problem yourself? Do you know better than everyone else?

If the RR sender sits in an area where there is better coolant flow as opposed to a dead end, then it will react to changes in coolant temperature more readily than a sender that sits in a "dead end" and if that helps someone to react to a potential overheating situation sooner then all the better as far as I can see. I appreciate that these gauges aren't 100% per cant accurate and most will work with an off-set to actual temperature, but it's the reaction time of the gauge to a change of temperature that will help someone avoid overheating.


Ged