Simple as that. Imagine if you had the Bi turbocharged E550 
Cool Air = Faster than normal Car
Thread Starter
MBWorld Fanatic!
Joined: Jul 2003
Posts: 1,181
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From: Abbotsford, BC, Canada
1999 SL 500 & 2011 E 550 4Matic
Cool Air = Faster than normal Car
It is cold in Vancouver today.
- 1 degree Celsius ... 30 degrees F. Just below freezing.
On the way home after a long day of work, on a deserted country road - i decided to do a standing start on dry pavement.
I must have mashed the accelerator just right - because the V-8, E550 took off like a real beast. The jolt of power really brought a smile to my face.
I know NA engines like cool air - like an inter-cooler gets more HP / Torque.
I must have been well on the way to a well below sub 5 second 0-60 run. Took my foot off the gas because my stomach felt like the start of Rocking Roller Coaster at Disney.
It was awesome ... the ESP light flickering in the darkness as the car was barely holding traction.
Very cool experience ... got close to home and realized I was in Eco mode ...
Usually I switch to Sport as soon as Istart the car.
- 1 degree Celsius ... 30 degrees F. Just below freezing.
On the way home after a long day of work, on a deserted country road - i decided to do a standing start on dry pavement.
I must have mashed the accelerator just right - because the V-8, E550 took off like a real beast. The jolt of power really brought a smile to my face.
I know NA engines like cool air - like an inter-cooler gets more HP / Torque.
I must have been well on the way to a well below sub 5 second 0-60 run. Took my foot off the gas because my stomach felt like the start of Rocking Roller Coaster at Disney.
It was awesome ... the ESP light flickering in the darkness as the car was barely holding traction.
Very cool experience ... got close to home and realized I was in Eco mode ...
Usually I switch to Sport as soon as Istart the car.
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Joined: Oct 2010
Posts: 5,141
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From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
It is cold in Vancouver today.
- 1 degree Celsius ... 30 degrees F. Just below freezing.
On the way home after a long day of work, on a deserted country road - i decided to do a standing start on dry pavement.
I must have mashed the accelerator just right - because the V-8, E550 took off like a real beast. The jolt of power really brought a smile to my face.
I know NA engines like cool air - like an inter-cooler gets more HP / Torque.
I must have been well on the way to a well below sub 5 second 0-60 run. Took my foot off the gas because my stomach felt like the start of Rocking Roller Coaster at Disney.
It was awesome ... the ESP light flickering in the darkness as the car was barely holding traction.
Very cool experience ... got close to home and realized I was in Eco mode ...
Usually I switch to Sport as soon as Istart the car.
- 1 degree Celsius ... 30 degrees F. Just below freezing.
On the way home after a long day of work, on a deserted country road - i decided to do a standing start on dry pavement.
I must have mashed the accelerator just right - because the V-8, E550 took off like a real beast. The jolt of power really brought a smile to my face.
I know NA engines like cool air - like an inter-cooler gets more HP / Torque.
I must have been well on the way to a well below sub 5 second 0-60 run. Took my foot off the gas because my stomach felt like the start of Rocking Roller Coaster at Disney.
It was awesome ... the ESP light flickering in the darkness as the car was barely holding traction.
Very cool experience ... got close to home and realized I was in Eco mode ...
Usually I switch to Sport as soon as Istart the car.
Another thing that that makes it stronger is to turn the A/C off. The compressor can be running even during cold winter climate for de-frosting. It takes aboit 10% of the fuel mileage so it is quite big power consumer.
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Joined: Sep 2015
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From: Chicago area
2015 E400 and 2015 GLK350
Ah, yes. . . but at least here in the Upper Rust Belt we get higher air density more often. That said, my turbo car doesn't care - it just keeps the waste gates closed until it hits target pressure.
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From: V E G A S
1922 Ford Model T / no OBD
Even if the car is 0.1 second faster, even with stop watch it is not measurable.
So we are talking 99% placebo effect here?
Than remember that dense air make bigger air drag.
So we are talking 99% placebo effect here?
Than remember that dense air make bigger air drag.
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Joined: Feb 2014
Posts: 6,190
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From: MA
2008 E350 4Matic, 2011 E350 4matic
When I worked at a gas power plant, it was evident in the power output, hot summer days the plant struggled to do 270 megawatts, normally it was around 300, in the winter it could go as high as 340.
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Joined: Oct 2010
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From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
Assuming the volume and pressure stay constant, like is the case with N/A engine we can write the equitation as n = (1/T) x (PV/R). In this formula (PV/R) stays constant as assumed above.
Now the temperature T is the absolute temperature and for 90 F it is 305.4 K and 40 F is 277.6 K
So the amount of air moles (n) at 90 F is n = (1/305.4) x (PV/R) and at 40F n = (1/277.6) x (PV/R)
The ratio of the amount of air moles is then 305.4/277.6 = 1.10, i.e. 40F air has 10% more material than 90F air in the same volume. This means 40F air has 10% more oxygen than 90F air meaning the engine control system can spray 10% more fuel to burn the oxygen. This should result in 10% more power with the same throttle opening.
With an engine with almost 400 hp it is roughly 40 hp increase in power and this should indeed be noticeable. In my car is certainly is. And some tunes advertise only about this magnitude power increase so if those are noticeable so should the effect of the lower air temperature also be.
Turbo engines are probably different and I don't know how the air temperature after turbo chargers is controlled but the max pressure is controlled with the waste gates and volume entering the engine should stay pretty much the same so if the air temperature drops the above calculation should somewhat apply to turbo charged engines too.
Thread Starter
MBWorld Fanatic!
Joined: Jul 2003
Posts: 1,181
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From: Abbotsford, BC, Canada
1999 SL 500 & 2011 E 550 4Matic
As the the thermodynamic equation predicts - if in actuality there is a 10% increase in power (considering 90 F air vs 40 F air) ... does that relate directly to 0 to 60 acceleration?
If 5 second run (that may be a common feeling for an E 550 driver - which is impressive enough) turns into a 4.5 second run ... that would probably produce noticeable physical sensations in the body. I believe that is what put the smile on my face.
More than a pure placebo effect. Although that was in play as well.
If 5 second run (that may be a common feeling for an E 550 driver - which is impressive enough) turns into a 4.5 second run ... that would probably produce noticeable physical sensations in the body. I believe that is what put the smile on my face.
More than a pure placebo effect. Although that was in play as well.
MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,141
Likes: 1,293
From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
As the the thermodynamic equation predicts - if in actuality there is a 10% increase in power (considering 90 F air vs 40 F air) ... does that relate directly to 0 to 60 acceleration?
If 5 second run (that may be a common feeling for an E 550 driver - which is impressive enough) turns into a 4.5 second run ... that would probably produce noticeable physical sensations in the body. I believe that is what put the smile on my face.
More than a pure placebo effect. Although that was in play as well.
If 5 second run (that may be a common feeling for an E 550 driver - which is impressive enough) turns into a 4.5 second run ... that would probably produce noticeable physical sensations in the body. I believe that is what put the smile on my face.
More than a pure placebo effect. Although that was in play as well.
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Joined: Feb 2014
Posts: 6,190
Likes: 1,549
From: MA
2008 E350 4Matic, 2011 E350 4matic
Well you could always measure it with this butt dyno.
http://kalecoauto.com/index.php?main...&products_id=8
http://kalecoauto.com/index.php?main...&products_id=8
Super Member
Joined: Oct 2014
Posts: 748
Likes: 27
From: Zion
W212 E550 4M P2
Using the ideal gas law PV = nRT you can easily look into this.
Assuming the volume and pressure stay constant, like is the case with N/A engine we can write the equitation as n = (1/T) x (PV/R). In this formula (PV/R) stays constant as assumed above.
Now the temperature T is the absolute temperature and for 90 F it is 305.4 K and 40 F is 277.6 K
So the amount of air moles (n) at 90 F is n = (1/305.4) x (PV/R) and at 40F n = (1/277.6) x (PV/R)
The ratio of the amount of air moles is then 305.4/277.6 = 1.10, i.e. 40F air has 10% more material than 90F air in the same volume. This means 40F air has 10% more oxygen than 90F air meaning the engine control system can spray 10% more fuel to burn the oxygen. This should result in 10% more power with the same throttle opening.
Assuming the volume and pressure stay constant, like is the case with N/A engine we can write the equitation as n = (1/T) x (PV/R). In this formula (PV/R) stays constant as assumed above.
Now the temperature T is the absolute temperature and for 90 F it is 305.4 K and 40 F is 277.6 K
So the amount of air moles (n) at 90 F is n = (1/305.4) x (PV/R) and at 40F n = (1/277.6) x (PV/R)
The ratio of the amount of air moles is then 305.4/277.6 = 1.10, i.e. 40F air has 10% more material than 90F air in the same volume. This means 40F air has 10% more oxygen than 90F air meaning the engine control system can spray 10% more fuel to burn the oxygen. This should result in 10% more power with the same throttle opening.
I’m going to try my best to remember this little factoid so I can sound smart one day down the road.
Member
Joined: Apr 2010
Posts: 97
Likes: 31
From: Houston, TX
2012 E350, P2
It was 7:13pm on 02/06/19 to be exact.
You can get the coolant temp + engine temp + current gear display + lap timer etc by activating the AMG Menu on the instrument cluster (even Non-AMG vehicles). Of course you will need MB SDConnect + Vediamo + some expertise.
You can get the coolant temp + engine temp + current gear display + lap timer etc by activating the AMG Menu on the instrument cluster (even Non-AMG vehicles). Of course you will need MB SDConnect + Vediamo + some expertise.
Last edited by zeemob; Feb 10, 2019 at 02:06 PM.
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2011 E-350 4Matic Sport
Last year I tried to show my ditz neighbor why his cheap aftermarket "cold air intake" caused his car to perform worse not better.
It was just sucking in underhood air, and the aluminum tube acted like a big heat sink. I hooked up my scanner to show real time data. This was in Texas late summer.
Stock airbox and inlet IAT temp 96d F
Aftermarket air intake IAT temp 134d F
MAF sensor gm/sec reading increased with cooler air inlet temps, I figured due to denser air.
Short term fuel trim range also increased with the after market intake, I took it to be due to a leaner condition. I doubted the cone filter flowed any better than a good quality stock paper filter.
It was actually a hot air intake that made more noise.
I think cooler denser air is a good thing especially when its free as in outdoor temperature drop. The nice thing is that with computer controls the vehicle can take advantage of it!
It was just sucking in underhood air, and the aluminum tube acted like a big heat sink. I hooked up my scanner to show real time data. This was in Texas late summer.
Stock airbox and inlet IAT temp 96d F
Aftermarket air intake IAT temp 134d F
MAF sensor gm/sec reading increased with cooler air inlet temps, I figured due to denser air.
Short term fuel trim range also increased with the after market intake, I took it to be due to a leaner condition. I doubted the cone filter flowed any better than a good quality stock paper filter.
It was actually a hot air intake that made more noise.
I think cooler denser air is a good thing especially when its free as in outdoor temperature drop. The nice thing is that with computer controls the vehicle can take advantage of it!
Thread Starter
MBWorld Fanatic!
Joined: Jul 2003
Posts: 1,181
Likes: 75
From: Abbotsford, BC, Canada
1999 SL 500 & 2011 E 550 4Matic
Another near freezing night and a good acceleration run on the way home.
Has anyone ever noticed how the car reacts differently when the gas pedal is stabbed very quickly? Toe pushed up into the footwell.
i don’t think it is my imagination.
Gas pedal monitored for maxacceleration under under certain movements of the pedal?
Has anyone ever noticed how the car reacts differently when the gas pedal is stabbed very quickly? Toe pushed up into the footwell.
i don’t think it is my imagination.
Gas pedal monitored for maxacceleration under under certain movements of the pedal?
Senior Member
Joined: Nov 2018
Posts: 443
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From: California
2013 E550 4MATIC - P1, P2, SPORT
My E550 takes off like a damn rocket then lurches like it hit the end of a bungee cord when it shifts. I'm not sure if it's due to transmission, ESC, whatever other reason. Some time I'll record my instrument cluster while doing this because I'm usually too concerned with keeping my eyes on the road to see what's going on.
