Hondata

Hi, sometimes I see that ecu adds around 20% fuel on ECTcorrection % at wot.
Note: Fuel compensation table is "0" at that coolant temp compensation table.

Why ecu adds that much fuel even coolant temp compensation table is zero at that temperature?

Please provide more information as per the posting guidelines.

Hondata wrote:Please provide more information as per the posting guidelines.

Yesterday I tuned a eg civic with b18c type r engine. After 20 minutes of tuning (without a problem) ecu starts to add 20% fuel at WOT on "ECT corretion%" digital gauge under display tab. Immediately I checked ect fuel compensation table (on parameters tab) and it is set to "0" at 78 degree celcius ect. I dont have a datalog for that but I can attach calibration and a screen shot tomorrow morning.

Sorry if I can not explain clearly.

You need to get a datalog showing the issue, a screenshot does not give enough info.

Spunkster wrote:You need to get a datalog showing the issue, a screenshot does not give enough info.

I understand that screenshot does not give enough info but I don't have datalog for that car at the moment. I call my friend and want to come back to me again to have datalog. For now I attach the calibration and took a screenshot to show where I saw ecu adds fuel. I took in a red circle added fuel and also fuel compensation tables which show 0 at that coolant temperature. I attached the screenshot because may be I can not explain my self clearly. Also I saw this on other s300 while tuning before but that car has an open stucked thermostat and I thought ecu goes crazy because of that and I'm sure ecu adds fuel because when this happen injector duty cycle goes 100% at 6500rpm.

Spunkster

On this datalog you can clearly see that ecu adds %13 fuel after 13th second of the datalog. Before this datalog ecu add around %20 fuel at wot but I don't know why sometimes ecu adds less fuel. This datalog recorded with the calibration I attached before.

Thanks

It does not look like the engine is fully warmed up, or you have either a low temp or no thermostat. You can also look at the Minimum compensation - laod based table in the fuel compensation tab.

Spunkster wrote:It does not look like the engine is fully warmed up, or you have either a low temp or no thermostat. You can also look at the Minimum compensation - laod based table in the fuel compensation tab.

thanks spunkster, this car has low temp thermostat as you understand.


this applies only at wot or does it has a pre determined map pressure?

Get a regular thermostat. A low temp thermostat will only cause more issues.