Cadillac Catera and Cimarron Forum Discussion, Air Intake Modifications?? in Past Cadillac Vehicle Discussion; The air intake system on this car looks like it's 3 times as bog as necessary. Why do the pipes ...
Automobile(s): 2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
East Boston MA.
That would be a HOT air intake. Hot air pulled from under the hood is less dense than the cool air pulled in by the stock intake ducting (which is already CAI). Warmer intake charge = less power and fuel economy.
You could fabricate a true CAI with a more direct route to the intake manifold, but in all likelihood, the stock setup can flow more air than the engine can use at WOT, at redline. You could always hook up a vacuum gauge to measure any vacuum in the ducting, you'd probably never see the needle do much more than twitch.
Also, realize that even the freest flowing intake only makes a difference at WOT. Any other throttle angle and the TB butterfly valve is the greatest restriction.
Automobile(s): Platinum 2001 Cadillac Catera Sport
Re: Air Intake Modifications??
I spent a lot of time researching that set-up. It's called the Dual-Ram (97-98) and the Multi-Ram (99-01) and its purpose is to optimize the airflow to the cylinders for max Torque at low RPM and HP at high RPM. Read about it in my post:
From what I learned I made the only mod I felt would remove some of the airflow restriction but preserve the benefits of the factory set-up. I removed the snorkel ahead of the radiator, the tubing to the air filter housing, and the housing itself replacing it all with a K&N filter cone. Yes it sucks in hot air but from what I read it's an acceptable compromise. The car seems to respond to the throttle better and the intake growl sounds great.