Temp Sender ?

[V8Bart]

I always end up with the bible at home when I need it in the car, and in the car when I'm home.
It's an annoying habit, my temp is not reading right and wanted to order a replacement and know where it is? and what model please?

Sure its been asked on here before but as always search is down.

Thanks for any pointers.

[shoggyraminator]

all three of them are located close to the dizzy. One is for the ECU, ones for the temp gauge amd the other is just filling a hole (not used). Quick search on the stealer sites will show you which one is which.

[kevd]

Try Racetech Direct, I've just ordered one it was about £12. Make sure you get the right one as there are two types, they should ask you what type of gauges you have.
I have not sussed out how to fit mine yet as it looks like a right pain to replace, if any one has any words of wisdom please let me know.
Kev

[V8Bart]

Ok, cheers guys. So is 3rd spare one just a blanking plug or could I swap connection?

[kevd]

I am actually using the spare sender, it is the old Land Rover sender, it works fine BUT you do have to put a resistor in line. I think I ended up using 170 ohm resistor. It does seems to work OK but I don't trust it 100%.

[V8Bart]

Cheers for reply, found a couple of huge posts about this now. Some use 120 some 170 and I will make up a couple of adapter cables to try out but is it ohms or K ?

Cheers.

[Argent]

It should be a 170 ohm resistor but if you but if you want to get it really accurate put a variable resistor on first and establish engine temp with a infrared heat reader at your local friendly TVR garage.

A.

[V8Bart]

Thanks for that, cable made up and will test tomorrow. Fingers crossed.

[Argent]

Having said the above recently bought an Ecumate and reading temp from the ECU I found that I needed a 120 ohm resistor to get a reasonably accurate gauge reading. Definitely best to establish the temperature independently then.

A.

Edited by Argent on Wednesday 24th April 10:43

[Sardonicus]

Yeh, but don't forget the ECU sender is not that accurate either it just give's the ECU a sweeping/linear temp scaling it don't care if it sweeps from -20 to 120 accurate/true temp or -5 to 105 inaccurate temp its just a reference input/look-up for the ECU to base the motors fueling warm-up requirements

Edited by Sardonicus on Wednesday 24th April 10:45

[Argent]

So the only real way to do it is to use an IR gun I guess?

[Argent]

Sardonicus

Just out of interest what kind of running temperature do we want, I would have said around the 90deg mark.

[carsy]

Allegedly the RV8 runs at its best between 90 and 95. How true this is i know not.

Edited by carsy on Wednesday 24th April 11:09

[Argent]

OK I am going to put this to the professional on here, I am interested to know what they say.

A.

[Sardonicus]

Try to run my engine around the late 70's to be honest mine usually runs around the 80 mark, any performance motors I have built in the past are in the mid to late 70's this is from a performance point of view by the way not emissions or fuel economy, you have to be careful with the Lucas system has you may drop/dip back into cold enrichment which is not ideal.