[akkando]

Usually in the Northern California Bay area it's not very warm. Usually 60s and 70s. Today it was over a 100 and wow did I notice a big difference in performance when driving in the afternoon! Car didn't feel like it pulled very hard at all. Still sounded good though!

Guess I better not move to Texas or Arizona, or if I do I should upgrade the intercooler!

[zhp2m3]

It as hot as shit in the bay!!

[just blaze]

I feel like a fish out of water especially out in SF! Our yearly dose of Indian Summer

[geogerf]

So Cal is on fire right now. Feels like you're in an oven.

[M2018]

Originally Posted by zhp2m3

It as hot as shit in the bay!!

Originally Posted by just blaze

I feel like a fish out of water especially out in SF! Our yearly dose of Indian Summer

Originally Posted by geogerf

So Cal is on fire right now. Feels like you're in an oven.

My WK37 car has a standard equipment code 823 Hot Climate Version

823 Hot Climate Version Heissland-ausfuehrung

Don't know what's that. I am in Texas.


Edited: found this by googling it. See the last post on this thread:

http://www.e90post.com/forums/showthread.php?t=690543

[OSee]

Originally Posted by geogerf

So Cal is on fire right now. Feels like you're in an oven.

80 at the beach.

[Corinne]

Originally Posted by M2018

My WK37 car has a standard equipment code 823 Hot Climate Version

823 Hot Climate Version Heissland-ausfuehrung

Don't know what's that. I am in Texas.

I think cars destined for Texas have an exhaust outlet on the roof....

[Robin_NL]

Originally Posted by M2018

My WK37 car has a standard equipment code 823 Hot Climate Version

823 Hot Climate Version Heissland-ausfuehrung

Don't know what's that. I am in Texas.


Edited: found this by googling it. See the last post on this thread:

http://www.e90post.com/forums/showthread.php?t=690543

I read:

Die Heissland Einstellung bezieht sich auf die Klimaautomatik. Ich habe mir diese Einstellung programmieren lassen, schwarzes Auto... Die Klima läuft effizienter und kühlt schneller...

Which means the aircon is running more efficiently and cools faster.

Cheers
Robin

[Transcon]

Originally Posted by OCfromOC

80 at the beach.

Which is why we live here

Now if we could just get rid of all the damn traffic on 133

[pruettfan]

I live in AZ, I have driven my car in all temps between 28 degrees and 119. I have only noticed diminished performance when the heat is over 110-112 and I have been driving really hard for a good 45 mins or so. On a 119 degree day with a short drive I expected immediate issues but didn't , that day I wasn't out for long so I am sure it was just a matter of time. Fact is any car will perform better on a cool day than a hot day but I think some of the discussion about heat soak on the M2 are a little blow out of perspective at least from my experience. I have not tracked my car during one of these hot days so I am sure the folks that do track on 100 plus days are experiencing some heat soak, physics is a bitch.

[akkando]

Originally Posted by pruettfan

I live in AZ, I have driven my car in all temps between 28 degrees and 119. I have only noticed diminished performance when the heat is over 110-112 and I have been driving really hard for a good 45 mins or so. On a 119 degree day with a short drive I expected immediate issues but didn't , that day I wasn't out for long so I am sure it was just a matter of time. Fact is any car will perform better on a cool day than a hot day but I think some of the discussion about heat soak on the M2 are a little blow out of perspective at least from my experience. I have not tracked my car during one of these hot days so I am sure the folks that do track on 100 plus days are experiencing some heat soak, physics is a bitch.

I dunno, maybe my car just sucks or I am imagining things. Seemed like it was noticeably laggier to me, but didn't seem like limp mode or anything.

[Glounk]

Went to the beach 3 days a go, it was 44*c= 111 fahrenheit and the car was parked there under the sun for more than 10 hours, after first star i had something like " pedestrian detector" and " proximity radar" faults, second start, same thing....... run up thinking it would cool down and go away and i was right. After 15 min i stopped restarted the car and nothing displayed

I have one question for who knows: are the cooling fans motors in the engine bay " brushless " ?

[Ramos]

Originally Posted by akkando

I dunno, maybe my car just sucks or I am imagining things. Seemed like it was noticeably laggier to me, but didn't seem like limp mode or anything.

This may big apply to the M2, but in my M235, the car runs cooler in sports mode compared to comfort mode. The fan runs longer and kicks in sooner to keep both coolant and oil temps down. And this was proven on a track on a summer day.

[Spa2k]

Originally Posted by Glounk

Went to the beach 3 days a go, it was 44*c= 111 fahrenheit and the car was parked there under the sun for more than 10 hours, after first star i had something like " pedestrian detector" and " proximity radar" faults, second start, same thing....... run up thinking it would cool down and go away and i was right. After 15 min i stopped restarted the car and nothing displayed.

That's fairly typical for automotive and other electronics in extreme heat. Even though the car wasn't running, interior temperatures could have reached 130 degrees or more - plus the underhood area never would have cooled. So, some of those hidden computers just heated up beyond their operating temperature range and malfunctioned; once you got airflow moving over them, they started working again. Some other "computers," like smartphones, just power down when they overheat.

[XutvJet]

Originally Posted by akkando

I dunno, maybe my car just sucks or I am imagining things. Seemed like it was noticeably laggier to me, but didn't seem like limp mode or anything.

There's definitely more lag in hotter temps. It's because there's less readily available oxygen. Same goes for altitude; more lag. There's no getting around it in a turbo car.

[jjclyde]

Originally Posted by XutvJet

There's definitely more lag in hotter temps. It's because there's less readily available oxygen. Same goes for altitude; more lag. There's no getting around it in a turbo car.

Really? Seems counter intuitive to me. And also counter to personal experience. But I am by no means an expert on this topic - so maybe I'm just ignorant ...

I don't know about the "less oxygen content" thing. I didn't think heat or altitude changed the actual chemical composition of "air" - just fewer molecules of air in a given fixed volume - right?.

Regarding altitude - my experience in driving various cars to high altitudes is that my NA cars got wimpier the thinner the air got (was very noticeable in my E60 M5)- but turbos stay the same (my m235i seems unfazed by altitude). This made sense to me cuz I assumed that thinner air in a NA car produced a poorer fuel/air mixture. But with a turbo, you aren't relying on mother nature for your air density - the turbo is cramming compressed air down the engine's throat - and so the thinner air at high altitude gets compressed to the proper density for a proper fuel/air mixture - yielding equivalent performance.

Is my thinking just plain wrong on this?

Or .... maybe I'm misinterpreting your comment. The OP was talking about poorer performance. I think maybe you're not saying the performance is degraded - you're just saying the lag-time (the time before peak turbo-induced performance is available) is longer (??). I guess that might make sense - takes longer to get air compressed to optimal density when the air is less dense to begin with.

Apologies for thinking out loud here - but I am curious now to know if my understanding is even close to reality.

[XutvJet]

There's less oxygen in hot air because atoms are further a part for the same volume of air. Same thing goes for altitude, the air is less dense with oxygen because there's less atmospheric pressure.

Naturally aspirated motors are greatly affected by hot temps and/or altitude. Throw humidity into the mix and things get even worse for power production. Turbo motors are affected as well, but not nearly as much (about 30% compared to an NA motor). The reason turbos don't suffer as much is because the ECU allows for more boost to be created to meet the demanded torque target (i.e., full power), thus cram more oxygen into the motor. For example, on a crisp 40 degree day, your M2 may only make 12psi to meet the demanded torque target. On a 30 degree day max boost could be as low as 10psi to meet targets. On a 100 degree day, it may require 14-15psi. Although the peak hp and tq would measure the same assuming the motor isn't heat soaked, you'd feel that there is more turbo lag in hot temps and/or altitude. There's no getting around that. On colder days, the turbo motor will feel a lot snappier and responsive, especially in the low to mid range.

Lastly and somewhat related, the M2 can suffer from heat soak. This is largely because it's a factory modified N55 pushing 10% more power over the M235's N55 all while running the same intercooler and cooling system minus some minor oil cooling improvements. The M235 is already susceptible to heat soak and the M2's extra power doesn't help things. If the motor is heat soaked and air intake temps are ultra high (i.e., 120+), the ECU will start pulling timing and boost to keep detonation at bay. An M2 can loose a decent amount of power when it's heat soaked and there are a few dynos floating around showing this very thing. Auto reviews have also noted how much stronger the M2 feels when it's being run in cooler temps and not heat soaked.

[AngryBaby]

Originally Posted by Glounk

Went to the beach 3 days a go, it was 44*c= 111 fahrenheit and the car was parked there under the sun for more than 10 hours, after first star i had something like " pedestrian detector" and " proximity radar" faults, second start, same thing....... run up thinking it would cool down and go away and i was right. After 15 min i stopped restarted the car and nothing displayed

I have one question for who knows: are the cooling fans motors in the engine bay " brushless " ?

I have to park in direct sunlight at work and these warnings happened to me for multiple days consecutively and multiple occurrences this past summer in Texas. Always went away after 10-15 min on the toll road.

[Spa2k]

Originally Posted by Corinne

I think cars destined for Texas have an exhaust outlet on the roof....

Actually, it's an option all across the U.S. now. It's called a Moonroof.