question time.

anyone ever thought about having 2 intercoolers. maybe patching on a fmic & also keep your smic. or somthing radical like a fmic & top mount with a hood scoop..

sounds wild.. wonder tho if it would multiply pressure drop through them or what it would do to efficiency...

probably wouldnt be worth it the pressure would drop too much. but a hood scoop intercooler would be hot. make it be like louvers in the hood to scoop air from the front then through the intercooler then down to the engine. it's probably heat soak from the engine heat though

anyone ever thought about having 2 intercoolers. maybe patching on a fmic & also keep your smic. or somthing radical like a fmic & top mount with a hood scoop..
The pressure drop would more than likely cancel out performance gains.

i dont really undestand pressure drop, and how it would affect the performance of the car. i just thought by having a second intercooler it would cool the air even more, helping performance.. so you think it would hurt the performace more so then help it huu...

it has to do with the length of the pipes connectiong it all together. the turbo has to move that much more air to atain the same boost levels. like blowing thru a 2 inch straw and blowing thru a 2 foot straw. in order to fill up the entire length it will take 10 times as much volume [not exact #'s]. and it would not be necessary when a large FMIC could do it better. like the twin vs single turbo question... it's just unnecessary.

I know I wrote a novel on this a long time ago, but I cant find it...

Short version is that putting the two ICs in series will ADD to the pressure drop. Putting them in parallel will REDUCE the pressure drop. But in either case you have more volume to fill, which generlaly increases lag. By how much, depends on the turbo. Putting them in series wont do much for the temps anyway, I Did find this little snipit I wrote a while back on this point:

Ponder this law of physics:

The rate at which an object changes temperature varies directly as the difference between the temperature of the object and the temperature of its enviroment.

Don't ask me how the hell I know that, just trust me ;) Basically what it is saying is that the greater the difference between the intake air and the air outside the IC (same as IC temp, given efficiency rating) the more the intake air will be cooled for a given area. Heres an example with numbers I will pull out of my ass. We have two identical ICs in series. Lets say ambient is 100. Intake is 300. The first IC drops the temp to 125, since the difference is 200 degrees. Now according to the law mentioned above, there will be a much smaller percentage of that original temp drop because now the difference is only 25 degrees. I wouldn't be surprised if in this example it only took 5 degrees or less out, compared to the 175 of the first IC. So its no longer worth its weight, complexity, or pressure drop.

BTW you can observe the effects of that temp law above by doing this (like any actually will ;) ).... Take a thermometer at room temp and stick it in the fridge. Note how it drops fast at first and then tapers off and takes forever to go the last few degrees. It's not a linear function, but a curve.

well thats that then

Well that's obvious. If the temperature change is greater, the rate of change is faster. I believe hot water will freeze faster than cold water if you put them both in the freezer.

It wont freeze faster, but the temp will drop much faster! At some point though the hot water will get to the point the cold water was at, but the cold water has had a head start ;) So the cold water will freeze first. Just wont change as quickly, based on the above law.

It freezes faster. I didn't believe it when my teacher said so years ago either. http://www.wiskit.com/marilyn/freezing.html

thats wild.. i guess ill start using hot water when making ice cubes the old fashioned way lol

can somone say. bill nye

It freezes faster. I didn't believe it when my teacher said so years ago either. http://www.wiskit.com/marilyn/freezing.html


Looks like I made the same incorrect assumptions this "marilyn" did! I never would have thought about evaporation, and the heat sink theory. Good stuff Joe! I'm going to read more about this. Hell, I might even try it.