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#12: 03-30-2011, 05:53 PM
 
 BAC5.2
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Title: OTM Dir. of Engineering
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Quote:
Originally Posted by SeeeeeYa View Post
"Thermal mass" is the reason. In daily driving that thermal mass does just that... absorbs a large mass of thermal energy. That heat, largely from the engine, is both larger and lasts longer in the HEAVY aftermarket TMICs.
It takes longer to heat soak a big TMIC, and moving more than a few mph will bring engine bay temps down to near ambient temperatures. Your argument works both ways, and in most daily drives you are moving more than you are stopped.

Quote:
The single most significant power-related "benefit" of most aftermarket TMICs is the fact they have less internal resistance. That, to me anyway, signals a loss in efficiency as well.
You are wrong.

1) Bar and plate provides more cooling surface area than tube and fin. Tubes and fins have low galley surface area, and low cooling fin density. Bar and plate cores typically have more than double the galley surface area (the wet surface area, even ignoring depth) and the same or greater fin density.

2) The increased size of the galleys, and the decrease in flow resistance they provide, decreases pressure drop across the core as well. A decreased pressure drop means your turbo is actually making less boost at the outlet of the compressor AND it isn't working as hard to pump air through a restrictive box. This decrease in outlet pressure and decrease in resistance drops the outlet air temperature significantly. Your turbo is working more efficiently, and the system as a whole is operating at higher efficiency. Lower inlet temperatures mean more dense air, which also means greater difficulty in heating that air.

Quote:
Not to mention raising your center of gravity with a ton of aluminum up high.
You are overstating the weight of an aftermarket TMIC. Yours, with the clamps, versus my aluminum aftermarket TMIC is really only going to be a pound or two more.

A pound or two, two or three inches above the center of gravity is not going to make a difference.

Having long hair versus a shaved head would have about the same impact on the center of gravity. Last I checked, Jenson Button had longer hair than Lewis Hamilton.

Quote:
I've done both. Read the NASIOC thread.
Done both of what? You've stopped the endtanks from blowing off, but you aren't going to outperform a bigger TMIC.

This is a good cheap fix, and your execution is top notch, but it is not better than aftermarket alternatives. Cheaper, and good for people looking for less out of their cars, but not better.

Last edited by BAC5.2; 03-30-2011 at 06:00 PM..
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