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Undertrays, Spoiler & Bonnet Vents, Part 3

Designing, siting, installing and testing bonnet vents
by Julian Edgar

Sorce: AutoSpeed - Technology, Efficiency, Performance
Details how to find the ideal spot to place your vent. How to determine if you are getting the desired effect. As stated its all about the pressure Vs lack there of.
This graph shows the pressure differential ( fore and aft of the intercooler) results of several of the mods that you are trying to design.

Your goal is to find the purple spot in the next pic. For your exit. And the red on tbe front for the intake.


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The magic of a "good" ecm tuner/ carb. tuner is the ability to adjust for today's up to the minute environmental conditions. This magical skill is able to be simplified when you eliminate some of the variables. The variable I am referring to is the IAT just pulling fresh air or just under "sealed" hood require a wide tuning map . Pulling both through a mixing valve will allow the smallest tuning window. AKA the most efficient.
OilPan has shown that a gen set non-intercooled is supposed to pull intake air from inside the enclosure below 20°f . As this is outside the tuning parameters. Aka a significant loss of efficiency is seen below this pre turbo IAT caused by a change in air density.
Gumby Stay Flexible