http://s197forum.com/forum/showthrea...ghlight=CAI%2A
Post 14 and on bring up points about CAI not designed to bring in more cold air but brining in more air. Now, there there is nothing wrong with the FRPP or Buillett intake. Isn't the same design as the Roush intake?

 

I would think that based upon every design there is an attempt to isolate the intake from the rest of the engine compartment. However, no matter how well sealed, unless you run a closed setup with a snorkel like tube to the outside, you are going to suck some hot air into the intake. It would seem that any efforts to truly supply only cold air to the intake would also mean some restriction to the amount of air brought in. So, isn't it more important to provide more air than just cool the air?

 

Yes, and as one poster put it on S197 forums, they should be call Mass Air Intakes and not Cold Air Intakes.

 

Looking at it from an engineers perspective, the CAI has two advantages. Because most of the air is drawn in from the front of the car and engine compartment draw is minimized, the inlet air is cooler. Cooler air is denser than warm air, so more power is available!! The other advantage of cold air (really ambient) drawn from in front of the car is the faster you go, the higher the dynamic pressure is in front of the car (there is pressure under the hood too) so then you get some ram effect which equates to more air flow, which equals more power.

 

Isn't that theory going to be challenged by the type of intake? In other words, the type of air filter used and its location? If the intake was completely unobstructed, a wide open tube, then the air would definitely be accelerated by the force of air coming in from the front of the vehicle versus having the intake in the wheel well, or somewhere else. However, won't the capabilities of the filter determine the amount of air that is drawn in and at what rate? One could stick the inlet tube all the way out the front of the car but if the filter is restrictive, it wouldn't make a difference would it?

 

The filter is only one source of losses in the inlet system.

For the air to pull thru the filter or any part of the inlet system, there is a corresponding pressure drop along the flow path (the filter, the tube between the filter and the throttle body, the throttle body, intake manifold, et all). All these affect the total volumetric efficiency of the engine (these are not all the things). Any one of these or all, that are not optimized, will pull the efficiency down. Filter plays a big part.

However, any positive pressure you can stack up in front of all that (including blowers or turbo's) will help the situation because the engine (naturally aspirated) can only to pull in a certain percent of the swept volume because of the losses, the other part is lost in the inlet system restriction and cam / exhaust action. Boost or any positive pressure will increase the volumetric efficiency.

At sea level, as each piston is drawing down, simplistically there is only about 15 psi atmospheric pressure trying to push that air into the cylinder. If you have 1 psi static pressure above atmospheric in front of the car that you can tap into, now you have 16 psi to push air into the cylinder instead of 15 psi.

 

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That is the setup I ended up with, the FRPP Bullitt CAI with a Tillman Speed tune. The difference is night and day from stock.

 

What did you end up finding out about the ford FRPP Bullet CAI CARB tune on a after market calibrator?

Paul

 

I honestly do not have ANY throttle lag at all. I have a 2008 Chevy 2500 hd truck for work and THAT truck has throttle lag..

 

I havent' tracked down an answer yet. I would think that Tillman, Bama, Brenspeed, or any of the others would be able to crack the Ford code, find out the parameters, and offer up an identical tune. I would have preferred that as an option from Tillman. When I had the option of choosing three tunes, I would have dropped my 87 performance tune in favor of a Ford copy. Then I could have left the Bullit intake on, swapped to the Ford Bullitt tune copy for smog or taking it to the dealer. I would think with copying the Ford Bullitt tune paramters identically, that Ford would just assume that someone with the Bullitt CAI also ordered the ProCal tune at the same time. Tillman, Bama, anybody? Can't this be done?

 

Is that with the stock setup? Mine was horrendous in stock form. Now it's **** near neck whipping off the line....

 

yes, stock tune. NO lag at all. none

 

I think you lucked out. From all the comments on the forum, that seems to be an exception to the norm.

 

with my luck. IF I get a tune I will get lag lol

 

Dealing with Ford is one thing, I only take my Fords back to them in desperation, but what about emissions testing? Will the test computer know its not a CARB tune and fail you?

 

Yep, the OBD II computers know what tune you have and will fail if it does not match up. They have gotten even pickier in California. My shop was telling me now that if they start a test, and the gas cap fails, they have one chance at putting another gas cap on and testing it again. If it fails again, game over, they have to start all over. Recently I took our Nissan in because it needed smog and the check engine light also came on. Turns out it was one of the emissions valves sticking open. They swapped a new one in and the light went off. However, now I have to drive it for a few days to get everything to reset. They tried to smog it when the light went off but the smog computer rejected it since all the paramters had not reset themselves back to the required settings. Maybe there is a smog expert here that can pipe in. It would be nice if I didn't have to pull the Bullitt intake every time I need smog.

 

Where are you located in NorCal 07 GT/CS?

 

I am suspecting to do it legal you need to get the Ford ProCal with the CAI kit, then buy the SCT from Brenspeed, Bamachips or Tillman to get the other tunes, then swap programs around when you need to get checked or inspected. Seems a lot simpler than swapping CAI parts back and forth. The ProCal unit apparently has some tunable features, but very limited (like maybe just tire size and gear ratio).

Texas is pretty picky on the emissions test too. My suburban gas cap failed, we looked at the filler neck where it seals and it was pretty cruddy. Asked them to wipe it off and it passed.

 

East Bay Area in the Tri-Valley.