2.0TDi - 150 - Warm up time example

 

Theres been plenty of posts regarding warm up time, the general diesels take ages etc..

 

To be honest, I find mine warms up in good time, with very little effort at all getting close to 90'c oil temp.

 

Photos taken today leaving the office after the car had been parked for 8 hours or so.

 

 

 

 

.. after -

 

 

 

My 1.6TDi 120 warms up quite quickly too - in the mornings at the moment I'm seeing the needle hit the 90 degree (12 o'clock) position within 5 minutes or about 5 miles after leaving the house.  I mainly noticed this as I'm waiting for the heat to come through to the car!!

 

Sorry no photos - difficult to do at 70mph...

The water temp on mine works as designed but the oil temp takes a little longer. Maybe 5-6 miles before any temp shows on the maxidot and then up to 10 miles before reaching 90+. However most starts to my journeys are downhill and not much more than 40 mph.

On the water cooling side of things the EA288 set up has some clever systems which mean that the water temp available for interior heating is available within a few miles, almost as quickly as SWMBO petrol engine car.

Notes below are taken from the self study programme for the EA288.

Thermal Management
A thermal management system controls the cooling system in the EA288 engine. The thermal management system is used for optimum distribution of the available engine heat while taking into
account the heating and cooling demands of the interior, engine and transmission. The thermal management system heats the engine quickly in the warm-up phase after a cold start.
The heat produced by the engine is directed to the components of the cooling system in a targeted manner. Using the heat available in the cooling system efficiently reduces internal engine friction, which reduces fuel consumption and exhaust emissions. The interior of the vehicle is also brought up to a comfortable temperature quicker.
Coolant Circuits
The coolant circuit consists of three partial coolant circuits to ensure heat distribution is based on demand.

And here is how it achieves that fast warming.

If the engine is cold, the thermal management starts with the micro-circuit, allowing for fast heating of the engine and the passenger compartment. During this fast heating of the coolant, the coolant thermostat remains closed to the radiator. The circulation of the coolant in the large circuit is prevented by the modulating piston of the switchable coolant pump being pushed over the pump impeller. The resultant “static coolant” heats quickly ensuring that the engine does too. The coolant in the micro-circuit is moved by the V488 Heater Support Pump. This pump is actuated by the ECM as needed, depending on the coolant temperature in the cylinder head. The requested passenger compartment temperature is provided by the Climatronic control module and is taken into account when actuating V488.

Edited 20 February, 20179 yr by Sagalout
added notes on micro circuit