ok, so does anyone know reportedly why turbos do not function at their most robust at low outside temperature?

 

Not me, the longer I live beyond college mathematics the more my math skills regress. I'm hell on wheels with Excel spreadsheets these days, but beyond that I've got nothing. Interested in the topic, though.

 

I didn't know that was a common problem, and a quick Google search doesn't seem to bring up much on the subject. I did find one short discussion of the subject relating to GM vehicles:

https://gm-techlink.com/?p=11016

It mentions a few different issues, but the main one appears to be moisture condensing and freezing in the air cooler.

 

simple answer is cold air is more dense and holds more oxygen.

turbos love cold air but when too cold the ecu is over compensating

i love early morning drives in my tuned m8. it is also running a piggy back tube but was customed tune. so not off the shelf. throttle response is amazing. but i love in California and the coldest it gets is low 30’s and that’s once and awhile

 

That's not really an explanation. The ECU is overcompensating for what? And why is cold better than hot, but too cold worse than cold?

 

there is a reason why i said simple answer. quick google search can explain why cold air is better than hot for turbos

if you research in more detail many have issues with their cars in extreme temperatures.

the ecu is over compensating then increasing fuel and in some cases running rich or not providing enough fuel and running lean, or enough fuel for the oxygen intake

quick summary of the link. cold air is more dense. you will notice you car perform better in normal cold temps compared to a hot summer day


https://www.turbodynamics.co.uk/medi...sonal-weather/

 

That link addresses why turbos perform worse in hot temperatures. That wasn't the question, which was about why they might perform worse in very cold temperatures, so your "quick Google search" didn't work.

 

sorry cant help you if you can’t figure out from the link.

it’s pretty detailed and answers your questions.

maybe you should try reading it

 

No - I read it, and it is just about why turbos perform better at lower temperatures. As for detailed, it's about as superficial as it gets. If you don't actually know anything about this subject then you might consider simply not posting.

 

I have had turbo cars for 30 years and ... guess what, as we all know, they're faster when it's cold.

Turbochargers do not perform worse at low temperatures. If the claim is that modern engine management software backs off the power at extremely low temperatures, which means that "the car performs worse"... then, that's what is happening. If you are wondering the *reason* why... well, then, I don't know. And who cares. It's emissions related (most likely). And are we actually racing a Defender at subzero temperatures?

In other words, this thread is becoming rather tedious...