Dxb2 posted in another thread about the temperature variance during the test of the 335i and the g37.
Quote:
"the g37 the temp was 77 F and they got 13.9 in 1/4 mile here is the link http://www.edmunds.com/insideline/do.../pageId=125509"
and
"in comparsion with another review from edmunds 335i vs IS350 , the 335i got 13.4 in 1/4 mile and the is350 got 13.8 in 1/4 mile the temp was 54.5 F and here is the link http://www.edmunds.com/insideline/do.../pageId=124138"
Thank you Dxb2

My questions:
Correct me if im wrong, but dont turbos suffer from Heat Soak? So wouldnt the bmw's performance at 77 degrees decrease more than a linear factor?

Inversely, with the dual intakes, shouldnt the g37 at 55 degrees increase performance at more than a linear factor?

My personal experience: VQ gets stronger after break in also (keep this in mind)

Lets investigate this further....

Wouldnt it be nice if both cars were tested at diff temp ranges / conditions, side by side.....55, 75, 95 degrees.

This is a spin off thread from the "08 G37 6mt vs. 06 G35 Coupe 6mt performance" thread.

Incase anyone wants to read more of Page 4 from that thread
http://g35driver.com/forums/showthre...=164392&page=4

 

What is intercooler heat soak?

Heat soak is when the intercooler can't dissipate the heat that it absorbs from the turbo fast enough. When an intercooler can't cool the charge air by removing the heat from it, it loses its effectiveness. This explains why turbo cars tend to run slower or have slightly less power when the weather is warm.

From the sounds of it, an intercooler doesnt help avoid the possibility of getting heat soak.

 

Well...sit down around me oh young grass hoppers...

A turbo compresses the intake air.
Compressed air gets hot (not really because of absorbed heat from the turbo, although that is a factor)
Hot compressed air goes into the intercooler where heat exchange occurs
Cooler air = denser charge = higher power, less chance for engine ping.

It's a balancing act. Many ricers improperly sized their intercooler relative to the turbo size (they think bigger is better and looks "cool"), thus, causing drastic pressure drop, and resulting in power loss.

My old RX7 develops significant power increase on cool, winter nights...

Class dismiss...

 

If they tested the 335i in 77 F we may see different number , the performance will decrease, the same goes with the g37 if they tested it in 55 F the engine will breath better due to the lower temperature which will make the g37 perform better in 0-60 and 1/4 mile

 

Although I believe all cars perform better on cooler days, I don't think 77F would result in that drastic of a performance drop for the 335. 77F is still nice weather. Maybe a tenth or 2, but I could be totally wrong.

 

Read some posts on LS1GTO forum about a gto that would suffer from heat soak after sitting in the sun or from a hot drive where the car was sittin outside a house and that allowed the engine bay heat to add to the heat soak.

 

Much of it depends also on the humidity and barometric pressure as well. It all boils down to how dense the o2 in the air is. Cold air is normally denser and less humid. I'm no GURU and someone correct me if I am wrong- Here is the way I understand it in simplistic terms: Humidity = less oxygen. Oxygen is needed to burn your fuel. If the mass air flow meter detects more O2 content then the result is to advance the timing of the engine to take advantage of the higher O2 content. Advanced timing = better use of your power.