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27th July 2021, 06:39 | #24 | |||||||
This is my second home
75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007
Location: Johannesburg ZA
Posts: 6,200
Thanks: 1
Thanked 859 Times in 613 Posts
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I have run with my thermostat for more than ten years and not incurred any fuel penalties. Quote:
When I need scriptures quoted I go and nod off in church! So let me do the work for you! Again! http://archive.retro.co.za/archive/c...h-Motronic.pdf Bosch, Combined Ignition and Fuel-injection system Motronic, Technical instruction. P22 Adjusting to Operating Conditions: Cold Starting, graph Duration of cold start valve operation as a function of coolant temperature, switch off 55 degrees Centigrade. P24 ill. 51 aux air at idle vs. engine temperature, cut off at 80 degrees P26 illustration 54 Enrichment as function of temperature, cut off at 80 degrees. https://www.calameo.com/books/002414077b9b2f09ad1c6 Page 50: Even in the coldest weather the engine will have warmed up sufficiently for the mixture to be dialled back to near nominal values within 2 to 3 minutes. Since it is difficult, if not (so far) impossible to obtain the exact values for the Siemens ECU used in our cars, we have to use our thinking caps, and find pointers elsewhere. Here is a bit of the MG control system, where temperatures are mentioned for oil, used as a substitute if coolant fails. The oil temperature in the MG is normally substantially hotter than the coolant, in a warm engine, and increasing with load. https://www.mgfcar.de/library/ENGINE...VVC_MEMS_3.htm Engine Oil Temperature Sensor The engine oil temperature sensor is located in the oil filter housing on MPi engines and in the Hydraulic Control Unit (HCU) on VVC engines. The sensor provides a signal which allows the ECM to adjust fuelling values according to engine oil temperature, to produce optimum engine performance and minimum emissions during the engine warm up phase. On VVC engines, the ECM also uses the oil temperature to derive the viscosity of the oil passing through the HCU, which indicates how quickly the VVC mechanism will respond. The engine oil temperature sensor consists of an encapsulated Negative Temperature Coefficient (NTC) thermistor which is in contact with the engine oil. The engine oil temperature sensor operates in a similar manner to the ECT sensor. If the engine oil temperature sensor fails, the ECM will substitute a default value which is ramped up 80°C (176°F). This condition will not be apparent to the driver, with the exception of the temperature gauge which will display incorrect readings depending on the sensor failure. The vehicle will run but may suffer from reduced engine performance and increased emissions as adaptive fuelling is disabled. The ECM will store fault codes which can be retrieved using TestBook. If you go for programmable aftermarket EFI's, then there are instructions on how to set the values, also the value wehre the engine has warmed up. As for example here:http://www.fc-design.jp/en/FiEcuManu...sh_release.pdf Read it yourself, for a change, but in there, you will find that the setting for engine warm up on mixture usually will be reduced zero once the engine is warm around 70 to 80 degrees. Quote:
http://www.t-a-s.co.za/thermostats-c...ue-TAS2018.pdf Here you will see 1: that many cars do not run with hot stats, many do. And what is more 2: there are different stats for the V6 in the Rover and in the Landrover, and by Golly!! there is for the 1.8 Rover, MG and the Landrover with the exact same engine! So a Landrover can run a 1.8 with a 75 degree thermostat 5275B and Rover/MG can run the exact same engine with an 88 degree thermostat 5288B. That, if nothing else, should even be able to convince our plastic guru that nothing in this world can be trusted!! How can Rover know what they are doing? Well, he has a point, if they knew what they were doing at all times, maybe they would still build cars?? That is just me! But Rover for all intends and purposes is an ex producer, they have passed on! if they were not nailed to the perch they would have fallen off!! Quote:
And for finishing, just a response to our Swedish cold contributer: Quote:
It seems to me you have not fully grasped how a thermostat works and what it can and cannot do. In cold climates, thermostats are not fully able to control the engine temperature, because the heat losses from the exhaust, and the heater, and the engine to surrounding air is so large that the water in the radiator in many cases do not even reach the start point of thermostat opening! In that case, please explain what an even higher opening temperature would do for you! Absolutely nothing. As you undoubtedly know, one solution in these cases is to fit a mechanical barrier to cold air entering the engine bay. And to pour cold water on the wound, look at the thermostats for VOLVO. I am sure you know VOLVO is Swedish, and they should know something about cold weather, nes pas? Some VOLVOs were issued with thermostats opening at 74 degrees! I guess these cars also came with a warning not to be used in cold weather of the coldest parts of Sweden! But seriously. I haven't got time for all these games of Simon says! It is a drain on my time. You should now have enough reading material here to keep you busy, who knows, maybe even create informed consent! I can only urge you to think, enjoy your cars and be happy if you have a thermostat that opens.! Whether that is at 82 degrees or 88 degrees. If this difference can ruin your enjoyment, cost you money and make you loses sleep then you have too little to do! Standing with an overheated lump waiting for the AA is not my idea of fun! __________________
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Worth his V8 in gold Last edited by kaiser; 27th July 2021 at 06:53.. |
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