Quote:
Originally Posted by griffy71
... As far as 10 [lb/sq.in] versus 15 [lb/sq.in]: If the system was originally designed to work without a cooler, then the cooler may be doing its job. In doing that though, air contracts as it cools, expands when it heats, etc. Kinda far fetched but not out of the realm of possibility.
The other possibility is excess pressure drop trying to shove all that air through the cooler. Friction loss could possibly be playing a factor. Try to find some performance specs on the CAC.
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Well said. For confirmation, check the pressure at both the inlet and outlet of the CAC. That'll tell you the pressure drop directly. Chances are, you have increased the airflow into the engine - get out your high school physics book, look up the
Ideal Gas Law (pv=nrt) and calculate the before & after mass flowrates.
Quote:
Originally Posted by hemivolvo
... i dont want to over do this so i dont think head studs will be an issue i just want to get back to 15lbs boost with cold air ...
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If you want to climb hills at a higher speed with a load, you need more power, period.
To get more power, you need more torque, more rpm, or both. I assume you're already running up to redline before shifting, so that leaves more torque.
More torque means beefing up the drivetrain. More torque also means more cylinder pressure, which means beefing up the engine. To achieve more cylinder pressure, you need higher cylinder temperatures, which means more fuel. Once the injector pump is injecting at its maximum rate, the maximum power is achieved with just enough air to completely combust all the fuel. (stoichiometric air:fuel ratio) After that point, pumping in more air without more fuel will just quench and cool the air-fuel mixture, resulting in a loss of torque/power.
The upshot: Without more fuel, the CAC is irrelevant and might as well come out. With more fuel, it becomes a fairly complex re-engineering problem with the potential of harming the engine.
