George, how does the outside air temp affect performance in a forced induction engine? OK, the assumption is that the turbo has sufficient capability to compress hot and cold air to the same O2 density, which is mentioned in this article as an example. I know a few people in the aero industry who know a few things about compressor performance at different temps, but then a turbofan on a plane is always set to the same speed for fixed manouvres like take-off and landing.

 

http://www.aet-turbos.co.uk/blog/story/turbos-and-temperature-summer-weather-and-turbocharger-performance

 

I guess then that the turbocharger in your car has a similar fixed speed control protocol, but surely by fitting a big enough design, then it just blows off more at lower ambient temps, but can deliver max / optimum density on hot days.

Sorry no, you need to ask them, do your own research.

I  have only had cars / bikes on Dynos or driven them below 4,000 ft above sea level, only used road fuels and it is years since i was aware of carbs icing and had issues with that.

I can only go on over 40 winters experience of driving on roads, never often at temps below -12*oC, & i try to stay out of the air when i can, and then leave the science & driving to those that know about that.

Turbos and temperature – summer weather and turbocharger performance _ AET Turbos.mhtml

 

5-6 Winters of driving 1.4 TSI Twinchargers.

They just love ambient temperatures below 6*oC.  Love higher octane petrol & also the winter formula petrol.

Feel smooth and perform so much nicer than from 12-30*oC on Summer Super Unleaded.

 

Then i have had 2 winters in a 2.0TDI 150 ps SCR/ DSG driving nice cold drives on nice clean cold roads at the same average speeds as during the summers, 

and 730 miles for 63 litres at times rather than the 630 miles in warmer weather.

But then there is no Tuning Box fitted that is giving any issues when the temp are below freezing as it has been for quite a few weeks last winter and this.

So for all the science and theory, just driving can sometimes be the proof of the pudding. 

 

About 6,000 miles driven this winter in temps around 0*oC average this winter same as last winter.

PH20 & DD8 Postcode areas and others. Shows or gives idea of temps around the UK November to April for 7 day periods.

https://coldweatherpayments.dwp.gov.uk 

 

If Tuning boxes are the jack of all trade & master in all conditions with drivers selecting the setting then they must be the future 

manufacturers should fit them, not just After Market suppliers,

and people need just have the Engine Management / Software that the Engineers and then these cheap optional extras.

Usually fitted by those renting a vehicle and scared to Re-Map a vehicle they do not own and might have to pay for engine failures of because of void warranties.

 

.........................

So useful, Digital Fridge Thermometers, get 2 for £1.98 postage free all the way from China, worth their weight in gold when modifying Air and Cold Air Intakes 

and getting temps around the systems and checking under bonnet temps.

Edited 19 March, 20188 yr by AwaoffSki

OK! Though science is used to explain observation, not the other way round. The challenge is to make acurate and repeatable observations  Once you've got an explanation of your observation then you can make predictions.

 

For whatever reasons, as there are several; there is a seasonal difference in performance, but it's not beyond the skill of an engine designer to eliminate them. Normally aspirated engine of course is a totally different proposition. Anyhow,back to the OP - I covered 220 miles yesterday evening in 2+1 and no problems at all. Outside temp according the Skoda thermometer anyway was between 0 degrees C and 1.5 degrees C for the duration of the journey.