Technical > Wiring & Sensors

Air and Coolant temp sensor scaling

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dnb:
Factual information is over rated... ;)

Boil the temperature in a pot of water on the hob and measure the resistance of the sensor and the temperature of the water.  Fit a best fit curve to this data in excel and use this as the input to the ECU. 

Simple ;)

As for the idle thing, I sugest that either the temp sensor is heatsoaking, or you have configured the "fake airden low limit" parameter incorrectly.

Sprocket:
LOL dont know what the fake airden low limit is or even heard of it till you mentioned it.

Please help with that one ???

Im off to jave a look at some config files :-\

Sprocket:
Is this the line i need to be looking at?

airden_ignore=00

dnb:
Don't know - it's called Fake airden low limit in Megatune.  Not sure what it is in the tables list.

The trick for setting it is to turn it off and see if the car wants to go lean or rich when it's sat idling.  If it starts to go lean (EGO correction will be large +ve reading), then the IAT sensor is getting heatsoaked by the engine and you should set the Fake aiden limit thingy to 80 or something around there.  Then the maximium leaning caused by temperature will be 80%.  Gradually increase this towards 100% to stop the car leaning out.

The other option is to simply put the IAT sensor somewhere it can't get heatsoaked.  Probably as difficult in a mini as it is in a TVR...

As I keep saying, absolute accuracy isn't at all that important to the ECU, but it is to us who read gauges...

Sprocket:
I would think in my situation sensor heat soak is at a minimum, the sensor is mounted in the K&N in its rubber base, id expect the air to be the same temp thus the air density to be correct with the measured temp reading?

By the looks of it I have the Fake Airden disabled.

I recon the EGC changes at idle are down to the CLT and MAT sensors reading 5 degrees different on a different angle curve resulting in fueling changes that are not representative of ctual engine conditions.

Still not satisfied that letting EGC correct it is good for all conditions, the speed density algorythm should take care of the changes in engine temperatures. Remember that you say you need a well tuned VE map for acceleration enrichments to function correctly, how can you tune this if the speed density algorythm isnt working as it should with varying temperatures, engine and ambient. Maybe the problem im suffering with AE as it seems fine one day and the next its not. LOL its a learning cure, Woo ;D

I sat down with the chip fryer last night and set up a lab to measure the resistance/ temperatures of the CLT sensor, i downloaded easytherm and generated INC files, not sure where to go from here though, but it is deffo clear that the 2063_256 patch is a steeper curve, yet coincidently at 25c the resistance is 2063 ohms ( I see what you mean about factual information)

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