Thread: RRC 90 EFI testing

you just self diagnosed it....

Thermostat...

The EFI in your car needs a 88 Deg C stat.. if not the engine runs cool and the ECU thinks its cold and then enrichens it.

Run the right Stat and you will improve the economy

Originally Posted by sclarke

you just self diagnosed it....

Thermostat...

The EFI in your car needs a 88 Deg C stat.. if not the engine runs cool and the ECU thinks its cold and then enrichens it.

Run the right Stat and you will improve the economy

I hear what your saying ... But I don't want to go 88 Deg C stat.. Thats why I want to "Trick it" into thinking its at temperature

Also the numbers on the tune resistor is not what it should be ... and this has nothing to do with engine temp (or does it?)

Mike

I hear what your saying ... But I don't want to go 88 Deg C stat..Er if you want to cure the richness you do. That is why your coolant temp sensor reads too high.

The ECU enrichens under 80C ( ie 400 Ohms), AFAIR about 5%. The only way you could trick it is to somehow get a lower Ohms engine temp sensor ( the one with the injector plug on the RH front of the manifold. )
You can get an 82C thermostat , and I ran one for a while but this is pretty near 80c on a cold day.

The tune resistor decides which country tuning program the ECU uses.This should not matter much as the cat program has a much higher resistance resistor.

The fuel temp sensor allows the ECU to compensate for hot fuel and richen the mixture to compensate for the lesser density. Yours is OK .

Really the only thing out of whack is that you have fitted a 76c thermostat.
Regards Philip A

Originally Posted by sclarke

you just self diagnosed it....

Thermostat...

The EFI in your car needs a 88 Deg C stat.. if not the engine runs cool and the ECU thinks its cold and then enrichens it.

Run the right Stat and you will improve the economy

^^^^^^That

And you "buffer" is a silly idea, if you have an overheating problem, you have an overheating problem, fix it, a cooler thermostat will merely save you being on the roadside by 20 seconds

Originally Posted by PhilipA

I hear what your saying ... But I don't want to go 88 Deg C stat..
Er if you want to cure the richness you do. That is why your coolant temp sensor reads too high.

The ECU enrichens under 80C ( ie 400 Ohms), AFAIR about 5%. The only way you could trick it is to somehow get a lower Ohms engine temp sensor ( the one with the injector plug on the RH front of the manifold. )
You can get an 82C thermostat , and I ran one for a while but this is pretty near 80c on a cold day.

The tune resistor decides which country tuning program the ECU uses.This should not matter much as the cat program has a much higher resistance resistor.

The fuel temp sensor allows the ECU to compensate for hot fuel and richen the mixture to compensate for the lesser density. Yours is OK .

Really the only thing out of whack is that you have fitted a 76c thermostat.
Regards Philip A

Thanks for that Phillip .... I had to start somewhere, and an understanding about the measured results of the Tuned resistor .... & also the relationship between the fuel sensor & the ECU

I had thoughts of "Maybe" splice a line onto the temp sensor and install a switch in the cabin with a 300 Ohm resistor in it, to "Trick" the reading ..... but alas .... as Rovercare says ..... "Don't be Silly"


I will install the correct Thermostat and hunt down some decent injectors

Originally Posted by rovercare

^^^^^^That

And your "buffer" is a silly idea, if you have an overheating problem, you have an overheating problem, fix it, a cooler thermostat will merely save you being on the roadside by 20 seconds

We all have our silly ideas ... Some work ... some don't

The 76 thermostat is a installed part from when I first got the car and was having issues A couple of years ago .....

Thanking you's

Mike

Thought I would elaborate a little further on the subject of the 76 thermostat and my main reason for "Wanting to keep this running temp"



Over the time I have noticed the features & failures of the "Slipped liner" in these rover blocks

Couple of things have stuck in my head as others have posted up thier problems and others have given answers

One was .... To install the new liner, they heat up the block .... and when you boil or overheat the motor ... the liner can slip as the block can loose grip of the liner at this temperature

Another was .... A comment was placed on a thread that mentioned that the rover block was never really designed to run 88 degrees ... Hence liners slipping .... It is only been setup this way for EFI

The carby versions are running 76 odd degree thermostat ... and do not appear to complain about liners letting go (unless they have been boiled)

So .... My methodology is that my motor is getting on (about 250k on the clock) .... and I am paying attention to keeping it in good condition for many more K's with trouble free motoring ....




One solution that has been rolling through my mind is installing a wire & switch with a 300 Ohm resistor in it, and splicing it into the Coolant sensor connection ... Basically when the car is warmed up .... just flick the switch (located in the cabin) and force the Sensor to read the 300 Ohms which would = 85 degrees?

/// Still thinking about it /// as in should it be less , say 200 Ohms //// is it worth all the hassle?


Mike

The general concensus by the experts eg Tuning Rover V8s, is that 100C is the level to not exceed.
Mine has now gone 165kk mostly with an 88C thermostat with no problems, but has NEVER been overheated.
One overheat is too many.
So my conclusion is that 88C is perfectly OK as long as you ensure that you have a clean rad,efficient 50-50 young coolant, good hoses, good viscous , good water pump, don't run with a blown head gasket etc etc.

A 76 c thermostat will make absolutely no difference if you do not attend to the other things. Oh it may give you a nanosecond extra time to shut down.
Of course the gauge doesn't move until about 100c also. LR sense of humour.
Regard sPhilip A

Originally Posted by PhilipA

Of course the gauge doesn't move until about 100c also. LR sense of humour.
Regard sPhilip A

Thanks for that Phillip .... The car has a top notch cooling system ... All has been replaced .... When first purchased, 2yrs ago, It was bought as a weekend bush hack .... It's Overall condition and use has certainly changed since then

Just trying to keep the ... "LR sense of humour" .... out of the equation

Mike